Mineralization and prospecting prospects in Anhui and Jiangxi areas

He Jurui, Wang Aiguo, Zeng Yong, Rui Xingjian

(Nanjing Institute of Geology and Mineral Resources, Nanjing 210016)

Abstract: There are mainly four major metallogenic systems in the Anhui and Jiangxi regions, namely, the Central Proterozoic submarine volcanic eruption mineralization system, Neoproterozoic submarine hydrothermal sedimentation mineralization system, Late Paleozoic hydrothermal sedimentation (late superposition) mineralization system, Mesozoic (Neo)zoic volcano-intrusive magma mineralization system. In recent years, we have achieved a batch of latest mineral prospecting results and expanded 9 important metallogenic belts. Comprehensive geophysical and chemical remote mineralization information shows that 10 prospecting areas can be considered as key areas for the deployment of the next round of mineral exploration.

Keywords: Anhui-Jiangxi region; mineralization system; prospecting area

1 Regional mineralization

1.1 Structural framework

< p>The Yangtze and Cathaysian plates in the Anhui-Jiangxi region and the Qinhang-Hangzhou combination zone have experienced a long geological history of 1.9 to 1.7 billion years at the end of the Paleoproterozoic (Lüliang Period) and 1 billion years at the end of the Mesoproterozoic (Four Dynasties). Fort period) twice cratonized, forming an integral part of the Rodinia supercontinent [1, 2]. During the Jinningian period, continental core disintegration, accretion to convergent orogeny, and the final formation stage of the continental block occurred; the Caledonian movement entered the unified South China plate development stage; the Variscan-Indosinian fold orogeny; the Yanshan-Himalayan block was activated, and intracontinental Basins were formed and the crust was thinned, which led to a large number of volcanic eruptions, granite intrusions and large-scale mineralization in eastern China.

1.2 Four major mineralization systems

There are mainly four major regional mineralization systems in the Anhui and Jiangxi regions [3~5].

(1) Mesoproterozoic submarine volcanic eruption mineralization system - iron sand street type massive sulfide type copper mineralization system.

The rocks that make up this mineralization system are produced within the Greenville cycle and are products of different environments, mainly island arc environments. The rock types are turbidite, tuff, basic volcanic rock, a small amount of acidic volcanic rock, accompanied by interlayers and lenses of jasper, barite and carbonate rock. The mineralization is dominated by layered and layer-like metal sulfide mineral layers or forms the source layer. The main mineral species are copper-gold ore, followed by lead-zinc-nickel ore.

Four Mesoproterozoic marine volcanic rock belts have been identified in this area: Wanzai-Yifeng, Tieshajie-Wangwu, Dexing-Lingnan, Huangtuling-Shizhukeng.

(2) Neoproterozoic seafloor hydrothermal sedimentation mineralization system - Zhang Shiba type layer-controlled (superimposed modification) lead-zinc (tin) mineralization system.

The Neoproterozoic includes the Qingbaikou Period, the Nanhua Period and the Sinian Period. The local names of the Qingbaikou strata in this area include Jingtan Formation or Dengshan Group, Likou Group or Luokeng Formation, Shangshi Formation and Wanyuanyan Formation Qbwy. After the Qingbaikou Period, the earth's crust turned into a stable environment of relatively stable erosion and littoral-neritic facies deposition, forming a large-scale stable cap rock, that is, a Nanhua Series sandstone-moraine-carbonate rock combination. Due to local volcanism, sedimentary differentiation and geothermal flow, mineralization elements are enriched in certain water basins, and metal sulfide deposits are formed locally. Such as the Yudu Yinkeng lead-zinc mine, De'an Pengshan Zhangshiba-Zengjialong lead-zinc-tin mine, Pengze Guoqiao copper-silver mine, Xiuning-Ningguo and other tungsten-lead-zinc mines.

(3) Late Paleozoic hydrothermal sedimentation (late superposition) mineralization system - Yongping type (Xinqiao, Wushan, Chengmenshan) copper-sulfur stacking modified mineralization system [6~ 8].

The ore-bearing strata are mainly clastic rocks and carbonate rock layers of the Carboniferous volcanic rock series, and sometimes the Permian and Triassic systems. The ore-controlling structure is a regional fault, and common magmatic hydrothermal fluids and mantle thermal fluids participate. The main body of the deposit is layered, and part of it is vein-like and sac-like due to the influence of faults. It forms an important part of the Yangtze-type "Trinity" mineralization combination summarized by previous researchers. There are known Tongling Xinqiao type and Yongping type copper-tungsten-sulfide-iron-lead-zinc deposits (large-scale), Dongxiang Fenglin layer-controlled copper-iron deposit (medium-sized), Lehua manganese deposit (large-scale) and Wushan-Chengmen Mountain layer known in this area. copper-bearing sulfide mineral deposits.

(4) Mesozoic (Neo)zoic volcanic-intrusive magma mineralization system - Tongchang porphyry copper deposit, Lengshuikeng volcanic rock-type lead-zinc-silver deposit, Maopengdian rock-type tin deposit, Ningwu porphyry iron ore mineralization system.

Hua Renmin 2005 [9] proposed that three large-scale mineralizations occurred in the Mesozoic in South China, all in the Yanshanian period. Among them, the first occurred between 180 and 170 Ma in the early Yanshan period, represented by Cu, Pb-Zn, and (Au) mineralization in northeastern Jiangxi and southeastern Hunan. The second time occurred in the second stage of the middle Yanshanian period (about 150-139 Ma), which was mainly mineralization of non-ferrous and rare metals such as W, Sn, Nb-Ta and so on in Nanling and adjacent areas. The third time occurred in the late Yanshanian period between 125 and 98 Ma, with Fe-Cu-Au-S mineralization in the middle and lower reaches of the Yangtze River, Sn and U mineralization in the Nanling area, and Au-Cu-Pb-Zn-Ag deposits in the southeastern coastal areas. represented by mineralization. The three large-scale mineralizations in the Mesozoic in South China are the product of the development and evolution of the lithosphere in the region. They are closely related to the extensional dynamic background, crust-mantle interaction, and the participation of deep thermal fluids.

The Yanshanian magma explosion and mineralization explosion in southeastern China have received the attention and summary of many scholars [10, 11], which has great guiding significance for mineral prospecting in Anhui and Jiangxi.

Several mineralization models have been preliminarily summarized, such as the Ningwu porphyry iron deposit, the Dexing porphyry copper deposit, the Lucong Longqiao iron deposit, the Shaxi porphyry copper deposit, and the Lengshuikeng porphyry-layer-controlled multi-site integrated type. Mineralization patterns of silver, lead, zinc, etc. The latter can be internally subdivided into the Yinluling porphyry lead-zinc-silver deposit (large-scale), the Xiabao volcano intermittent strata-controlled silver-lead-zinc deposit (large-medium size), and the Yinluling east-west vein type gold-silver deposit ( medium). Metasomatized niobium-tantalum ore (super large) is produced in the small alkaline rock bodies of Hengfeng and Wugongshan, which belongs to the A-type granite alteration type and contact metasomatism type.

The famous porphyry copper mines such as Tongchang, Fujiawu, Zhushahong and Yinshan have reached super large scale. Along the northeastern Jiangxi fault zone, it can be extended to the southwest across the Pingxiang-Guangfeng deep fault zone to Jianjianling, Le'an and Xiangshan, and to the north to Shexian-Jixi, Anhui, and even Liyang, Jiangsu. There are still many suspected porphyries. The copper deposit remains to be verified. In addition, it is speculated that there may be another porphyry copper belt to the west of Ganjiang River, trending parallel to the northeastern Jiangxi belt, and may involve Shanggao, Gao'an, Wuning, Jiurui and other areas. The above two major porphyry copper belts are both products of the Yanshanian volcanic-intrusive mineralization system.

2 New progress in regional prospecting

In recent years, the geological prospecting bureaus of Jiangxi, Anhui and other provinces have made great progress in prospecting.

(1) Preliminarily determined the Yunshan-Zhanggongshan-Baijishan-Tianmushan tungsten-tin mineralization sub-zone on the northern edge of Jiuling. It extends the Guibei tungsten-tin mineralization belt in the western section of the Jiangnan uplift to the eastern section of the Jiangnan uplift. This belt crosses Poyang Lake from Zixiushui, Wuning and De'an, and goes in the NE direction to Jingdezhen, Wuyuan, Jixi and Ningguo in northeastern Jiangxi. It is 300-500km long from east to west and 60km wide. New discoveries include the Xianglushan large-scale tungsten mine, Pengshan medium-sized tin mine, Yunshan tin mine, Maopengdian-Bazinao tin mine, Baiji-Xiaoyao-Qiaochuan-Xiwukou and other medium-sized tungsten mines.

(2) Preliminary discovery of important information about the layer-controlled copper mineralization zone in the Mesoproterozoic rift (?) metamorphic bimodal volcanic rocks on the southwestern margin of Jiuling. This belt extends from Wanzailuocheng in Jiangxi Province to Yaxi in Yifeng, and may extend eastward to Gao'an. It is connected to the Huangtuling and Shuizhukeng strata-controlled copper mineralization belts in Xiuning and Shexian in southern Anhui through Jingdezhen. Important mineral deposit sites include Wanzailuocheng-Yifeng Yaxi and Xiuning Huangtuling. It has expanded new horizons for mineral prospecting in the Jiuling uplift block and has certain regional prospecting value.

(3). Preliminary discovery of major clues to the layer-controlled copper mineralization zone in the Mesoproterozoic (?) rift trough metamorphic bimodal volcanic rocks in the northern margin of Wuyi. This belt extends from Tiesha Street in Qianshan, Jiangxi Province to Wangwu, and may be connected to the Mesoproterozoic (?) metamorphic bimodal volcanic medium-layered copper deposit in Xiqiu Mesoproterozoic (?) in Shaoxing, Zhejiang Province in the east. This provides new evidence for mineral prospecting in the northern edge (or adjacent edge) of the Cathaysia block.

(4) The large-to-super large prospective Yudu Yinkeng lead-zinc (gold-silver) deposit was discovered in the Neoproterozoic Qingbaikou strata at the western edge of the Wuyi terrane. The geotectonic position is in the transition zone between the Wuyi block and the Luoxiao block - the NE-trending rift basin of the Qingbaikou Period in central Jiangxi. The second layer of ore occurs in the siliceous dolomite interlayer of the tuffaceous volcaniclastic rock of the Shangshi Formation, with an average lead + zinc grade of 7% to 14%. Extended by 4~5km. In the Yinkeng mining area, 333+334 resources have been obtained: 1.9697 million tons of lead + zinc, 48.5 tons of gold, and 1302.55 tons of silver (according to Gao Guirong and Zhang Jiajing, 2004). The Neoproterozoic Qingbaikou-Nanhua system in the region passes from south to north through Ningdu-Guangchang-Nanfeng-Nancheng-Jinxi, and turns eastward to the Qianshan area. In recent years, a medium-sized lead-zinc deposit has been discovered in the Neoproterozoic Qingbaikou Nanhua System of Qianshan Changshou Source. This mineralized fracture zone extends nearly 15km east-west. The geochemical anomalies are large in scale, high in intensity and well integrated. The above-mentioned western and northern margins of the Wuyi terrane have the prospect of finding Qingbaikou stratigraphic-overlapping lead-zinc polymetallic deposits.

(5) A gold mineral belt of about 10km in length has been preliminarily determined in the Lingshan-Lianhuashan-Baijishan area from northeastern Jiangxi to Xiuning in southern Anhui, that is, the NNE extension direction of the northeastern Jiangxi fault. It consists of two mineralized belts in the east and west. The East Mineral Belt (Gulou Mineral Belt) is divided into several mining sections from south to north: Gulou-Damailu-Huangjian-Liuwanli, about 8.5km long; the parallel West Mineral Belt (Xiaohe Mineral Belt), From south to north, it is divided into four mining sections including Xinlingjiao - Hanjia - Tianjingshan - Xiaohe, with a length of about 7km. The gold-bearing silicification crushing bandwidth is 3 to 5 m, and the average grade is (5 to 9) × 10-6 (Wang Yinggeng, Wang Aiguo, 2003). The mineralized zone occurs in the middle-Neoproterozoic tuffaceous sandy slate intercalated with bimodal volcanic rocks. This area has great prospects for finding Jinshan-type layer-controlled-tectonic altered rock type gold deposits.

(6) Further expands the prospecting prospects of the Tongling-Fanchang copper-lead-zinc mineralization area. In recent years, a skarn-type copper-iron-zinc ore body was discovered in the contact zone between granodiorite and Triassic and Longshan Formation striped limestone 400m below Fuchengdun in Fanchang. It is more than 10 meters thick and contains 1% to 1% copper. 3%, zinc 1% to 3%, and the initial control length is more than 800m. It is estimated that the copper mine can reach a medium scale. The 812 Geological Brigade discovered a porphyry copper deposit in the Shujiadian anticline in Nanling County, with a prospective resource volume of above medium (Xu Wei, 2005)

(7) Through comprehensive regional comparison, Jiuling has recently been determined —The Nanhua sandstone-moraine system ore-bearing structures on the northern edge of the Zhanggongshan terrane may form a copper-tin polymetallic prospecting prospect zone. This is a brand new exploratory result. The ore-bearing structures are stably distributed about 500km in the NE-NNE direction. It covers the Mesoproterozoic greenschist phase metamorphic basement and the Neoproterozoic rift volcanic rock series basement.

This area is also superimposed with extensive Yanshanian tectonic-magmatic activities. A series of tin-copper-lead-zinc polymetallic deposits and ore points occurring in the same layer of the Nanhua System have been discovered along this belt. Typical examples include the De'an Zhangshiba large-scale lead-zinc mine, Guoqiao sandstone copper mine, and Lishan gold mine. The Zhangshiba lead-zinc deposit is a large-scale deposit newly discovered in recent years and currently under exploration and evaluation. The ore body is layered, with a controlled area of ​​more than 3km2. The main ore body has two layers. The ore body is 0.7~2.5m thick. The lead-zinc ore grade is 4%~6%. The layering is stable, and the thickness change coefficient and grade change coefficient are both very small. Small. At present, the controlled reserves (resources) include 3.2 million tons of lead and zinc, 1,060 tons of silver, and associated cadmium, thallium, selenium, etc. (Wang Shilin, Gao Wenliang, 2005).

(8) In the past few years, the Jiangxi Provincial Metallurgical Geological Exploration Bureau discovered the Hengfeng Geyuan super-large tantalum-niobium polymetallic deposit, which initially revealed that the periphery of the Lingshan rock mass in the Huaiyu terrane in Jiangxi is related to alkaline granite The appearance of the large-scale niobium-tantalum mineralization concentration area. The Geyuan super-large tantalum-niobium deposit is a polymetallic deposit. In addition to tantalum, which is super-large, niobium, tungsten, and tin are medium-sized, lead and zinc are small, and the associated rubidium is also super-large. Lithium and cesium can also be comprehensively utilized. . In addition to the Geyuan tantalum and niobium mine, there are also more than 10 tantalum and niobium deposits and mines such as Huangshandi (large), Shirendian, Crystal Mountain, Daling, Tangjia, Nantang, Jiuniu, Nanshan, and Nannilu. points and mineralization points (Wei Xinglin, Deng Guoping, 2004).

3 Prospecting Selection Selection

Based on comprehensive analysis of geophysical, remote and heavy mineralization and other multi-information, as well as multiple screenings based on decades of prospecting experience, theoretical summaries and mineralization predictions of predecessors [12～16], the following 10 prospecting prospect areas are specially proposed for reference for the new round of prospecting macro-deployment.

3.1 Jiujiang-Ruichang Prospective Area

Main minerals: copper, molybdenum and gold.

Main type: Wushan-Chengmenshan type layer-controlled skarn type (Trinity type).

There is still great resource potential in the depths and periphery of known deposits. The edges and depths of Chengmenshan Copper Mine, Wushan Copper Mine, and Dengjiashan Copper-Molybdenum Gold Mine are the main targets for deep prospecting. . In addition, the outer and deep parts of Fengshandong Copper Mine, Dingjiashan Copper Mine, and Yangjishan Gold Mine also have prospecting potential. Chengmenshan Copper Mine, Wushan Copper Mine, and Dengjiashan Copper-Molybdenum Gold Mine can be initially selected to carry out positioning prediction and verification of deep and edge deposits. The pursuit control of the skarn-type copper-molybdenum ore body along the strike and deep rock mass contact zone of the 15th line of the Longdanggou ore section in the Dengjiashan copper-molybdenum gold mining area is carried out. In addition, the copper-lead-zinc ore bodies and crypto-explosive breccia-type gold ore bodies in the Zhulintang mining section in the eastern part of Fengshandong Copper Mine may still extend to the edges and depths. It is worth digging deeper to find blind spots and explore more resources.

Figure 1 10 Prospecting Prospecting Areas in the Adjacent Areas of Anhui and Jiangxi

3.2 Wuning-De'an Prospecting Area

Main Mineral Types: Copper, Lead and Zinc Tin antimony gold

Main type: Zhang Shiba/Zengjialong type layer controlled stack modification.

It is located near the intersection and turning point of east-west and north-south structures. The Pengshan dome structure has Neoproterozoic Nanhua-Sinian volcanic rock-sandstone-moraine-carbonate rock ore-bearing structures, and the deep part is the hidden Yanshanian granite basement. Research on the Anhui-Jiangxi project preliminarily believes that this area has two major mineralization systems, namely the Neoproterozoic volcanic eruptive sedimentary mineralization system and the Yanshan-Hishan magmatic hydrothermal mineralization system (including superimposed mineralization).

The mineralization geological conditions in the Pengshan area are particularly superior and the comprehensive information on mineral resources is rich. Using the Zhangshiba layer-controlled lead-zinc mining area as a known model unit, model comparison and estimation were carried out. The total lead-zinc resources are in 1000 More than 10,000 tons, 1 million tons of copper, and total silver resources of more than 10,000 tons. Prospecting prospect with very large ore deposits. It is recommended to conduct a "comprehensive information prospecting model and total mineral resource prediction research" and on this basis, use the Pengshan area as the general battlefield, compare the model units as sub-war areas, use new technologies and new methods, construct drilling, and comprehensively carry out prospecting Check and evaluate work.

3.3 Huaining-Anqing Prospective Area

Main minerals: copper, iron, gold (sulfur).

Main deposit types: Yueshan skarn type and volcanic rock type.

In the surrounding area of ​​the Yueshan rock mass, the ore-bearing strata are mainly dolomitic marls of the Carboniferous Huanglong Formation and Chuanshan Formation or the Permian and Triassic systems, with EW-trending faults and folds uplifting or The intersection of depressions is a favorable structure for magma activity and mineralization. A number of sulfur, iron, gold and copper deposits, represented by the Yueshan Copper Mine and the Caiguashan-Bailing Gold Mine, have been discovered. The Duxiu Mountain anticline in the west is a fold area dominated by Paleozoic strata. There are low slow magnetic anomalies, gravity anomalies, low resistivity anomalies and geochemical anomalies. The preliminary explanation of the anomalies is that there are hidden rock masses in the depths, and the local emplacement at the top is relatively high. , is conducive to mineralization, among which the Huxing Mountain and Yinzhu Mountain areas have the background to search for "Dongguashan-type copper deposits" and areas with the potential to search for large-medium skarn-type copper deposits. The "Wutong Formation" is a place where iron caps are commonly seen on the floor. However, due to the relatively low level of research and work, its mineralization conditions can be compared with the mineralization characteristics of Tongling, southeastern Hubei and other places, especially in the middle layers of the Carboniferous ore-bearing strata. The control of skarn-type copper deposits has not yet been broken through. The Huaining volcanic rock basin in the western section is one of more than ten basins in the middle and lower reaches of the Yangtze River metallogenic belt. The two volcanic rock basins adjacent to this area, Luzong and Ningwu in the east, contain rich copper, iron, gold, Sulfur and other minerals, but the level of work in this area is low and no major breakthroughs have been made.

This area focuses on breaking through the skarn-type copper deposits in Huxingshan Yinzhushan and other places, and opens up prospecting work in new areas such as the Huaining volcanic basin, achieving new breakthroughs in regional prospecting.

3.4 Tongling-Fanchang Prospective Area

Main minerals: copper, iron, gold, sulfur, lead and zinc.

Main deposit types: Shizishan skarn type and strata-controlled superimposition (Trinity) type.

The intersection of the NE-trending fold structure composed of the Silurian-Triassic system and the nearly east-west or nearly north-south faults in this area is often a favorable location for the formation of magmatic rocks, ore fields and mineral deposits. The Middle Carboniferous, Permian and Triassic dolomitic limestones are the main ore-bearing layers. The late Jurassic-Cretaceous intermediate-acidic magma activity was frequent, and the related iron, copper, and gold minerals were abundant. There are dozens of large, medium, and small deposits that have been proven, such as Tongguan Mountain, Lion Mountain, Phoenix Mountain, Large-scale copper deposits such as Dongguashan, and large-scale sulfur-gold-copper-silver deposits such as Xinqiao, Mashan, and Huangshi Laoshan.

In recent years, geological survey work has discovered large-scale copper-lead-zinc mineralization zones in Baimuling-Yeshan, Suishan and other places. It is worth conducting in-depth verification work. The first is to strengthen deep detection; the second is to expand to the periphery of Nanling-Fanchang. The Institute of Mineral Resources of the Chinese Academy of Geological Sciences has carried out regional alteration-fluid mapping in recent years and established a new mineralization model of 4 mineralization systems and 7 subsystems, looking for "trinity-type" deposits in the periphery of Tongling, Fanchang and Nanling, and open Improved vision and prospecting ideas.

3.5 Lujiang-Zongyang volcanic rock basin and surrounding prospect areas

Main minerals: iron, copper and sulfur.

Main deposit types: volcanic-porphyry type (iron ore) and porphyry type (copper ore).

The Luzong volcanic basin is located in the two counties of Lujiang and Songyang, spreading northeastward. The west side is cut by the Tanlu fault and is in the shape of a large semicircle. The volcanic rock basin is superimposed on the compound syncline foundation composed of Silurian-Triassic and Early Middle Jurassic strata, and is an inherited volcanic rock basin. From early to late, the volcanic rock system is divided into four major cycles: Longmenyuan (coarseite), Zhuanqiao (coarseness), Shuangmiao (coarseness-potashite), and Fushan (coarseness).

In and around the Luzong volcanic rock basin, in addition to the large-scale iron-sulfur deposits discovered in Luohe and Dabaozhuang, there are also large-scale porphyry copper deposits in Shaxi, large-scale rich iron deposits in Longqiao, and medium-sized Yueshan Lead-zinc mine. There are many areas with the same mineralization conditions and geophysical and geochemical anomalies around the volcanic basin. For example, there are many gravity and magnetic geophysical anomalies in Huangtun Huangnihe-Panshiling, the northern edge of the basin, and Huigong Yutan Gaodian, the southwestern part of the basin. It has the potential to discover mineral deposits such as "Longqiao iron deposits", "porphyry iron deposits" and "porphyry copper deposits". Strengthen comprehensive analysis and drilling verification. It is very likely to achieve major breakthrough prospecting results.

3.6 Pengze-Shitai-Guichi Prospective Area

Main minerals: copper and gold.

Main types: sandstone type (copper-silver mine), altered rock type (gold mine), porphyry type (copper mine).

This area is located at the southeastern edge of the southward-protruding reflection arc of the Huaiyang mountain-shaped structure. The structural pattern of the Hukou section is similar to that of De'an Pengshan. It has Nanhua-Sinian sandstone-moraine-carbonate rock and late Paleozoic clastic rock-carbonate rock mineral-bearing structures. A small amount of Yanshanian rock mass is found on the surface, and gravity and magnetic geophysical anomalies infer the existence of three hidden rock batholiths. Eye-catching copper geochemical anomalies are distributed along regional structural lines. 22 copper-gold deposits (sites) have been discovered in the Nanhua System in Pengze County, including Guoqiao, Huashan, Dabijian, and Lishan. The mineral belt extends intermittently for about 50 kilometers. It has great prospecting prospects.

The Guichi metallogenic area roughly coincides with the foreland reverse fold-thrust belt. The discovered deposits are mainly skarn-type and hydrothermal-type copper deposits, followed by porphyry-type copper-gold mineralization and Hydrothermal tungsten, molybdenum, lead and zinc mineralization. In particular, the porphyry belt produced in this area is also one of the porphyry belts symmetrically distributed on both sides of the Jiangnan Uplift. Copper-gold polymetallic mineralization is common. In recent years, exploration work has successively discovered Paodaoling in Guichi County. The porphyry gold mine, Mashi, Tongshanpai-Jilaishan porphyry copper mine all reach medium to small scale. This shows that this area has great potential for finding porphyry copper-gold deposits.

3.7 Baiji Mountain-Tianmu Mountain Prospective Area

Main minerals: copper, lead, zinc, gold, silver, tungsten, tin, and molybdenum.

Main deposit types: volcanic eruptive sedimentary type, porphyry type, trinity type, and ductile shear zone type.

This area is located on the northeastern edge of the Jiuling-Zhanggongshan terrane, and the Northeast Jiangxi-Ningguo fault runs NE across the central part. It has mineral-bearing structures such as the Mesoproterozoic volcanic rock system, the Qingbaikou system marine-continental bimodal volcanic rock system, and the Nanhua-Sinian-Cambrian moraine-carbonate rock-carbonaceous shale. There are Tunxi and Qingliangshan Mesozoic volcanic rock basins and many Yanshanian intrusive rock bodies. Eye-catching geochemical anomalies are spread in clusters, and many gravity and magnetic anomalies are included among them. Medium-sized copper-gold-tungsten-lead-zinc deposits have been discovered such as Sanbao, Huangtuling, Qiaochuan, Jixia, Xiaoyao, Xiwukou, Dawjian, and Xiaohe. As long as investment and systematic work can be increased, several large-scale mineral deposits will surely be found in areas with such a unique and excellent mineralization environment.

Based on the work in recent years, the target areas that can carry out census and pre-survey include Hongcunkou-Censhan, Huangtuling-Jiepai-Fangwukou, Jiumuqiu-Yuanfang, Jiezhuying- Julin, Changchunwu, Qianmu Field, Torreya Keng, Dawujian, and Jiemeng.

3.8 Bazinao-Zhanggongshan Prospective Area

Main minerals: mainly tin-tungsten ores, and also gold mines.

Main types of rocks: rock types (tin deposits) and structurally altered rock types related to ductile-brittle shear zones (gold deposits).

This area is located in the core of the Zhanggongshan massif. It has gold-tin-tungsten formations in the Mesoproterozoic Shuangqiaoshan Group turbidites and small Yanshanian intrusive rock bodies - S-type granite porphyry formations. It is spread out in series, and dense geochemical anomalies are nested on it. Maopengdian medium-sized tin mine, Jinjiawu large-scale gold mine, Dabeiwu medium-sized gold mine, Qingshuxia medium-sized tungsten mine and a number of mineral sites have been discovered. With strengthened census and pre-examination, prospecting prospects will become increasingly clear. The key work areas for investigation and evaluation include Bankengwu-Maopengdian tin mine and Jialu gold mine.

3.9 Dexing-Huaiyushan Prospective Area

Main minerals: copper, gold, silver, niobium, tantalum, lead and zinc.

Main deposit types: porphyry type, ductile shear zone type, stratigraphic stack modification, and altered granite type.

This area is located in the collision and docking zone of the Jiangnan terrane and the Qiantang terrane - the northeastern Jiangxi collision melange zone and its side. The Huaiyu massif is sandwiched between the northeastern Jiangxi deep fault and the Le'an Jiangsu deep fault. Within the triangle area formed by the fracture. It has Mesoproterozoic Zhangcun Group volcanic turbidites, Nanhua-Sinian moraine-carbonate rocks and late Paleozoic mineral-bearing structures. Magmatic activity was intense during the Yanshan period. Due to the unique geological background and tectonic magma conditions, two major mineralization series including dynamic metamorphic mineralization and volcanic-porphyry mineralization have been developed.

The ore deposits that have been explored and developed mainly include the extra-large Tongchang copper (gold) mine, the large-scale Fujiawu copper-molybdenum mine, the large-scale Yinshan copper polymetallic mine, the extra-large Jinshan gold mine, and the medium-large Xijiang Gold deposits, Geyuan large-scale tantalum-niobium mine, etc. The proven copper reserves are 10 million tons, accounting for 7.5% of the country's total reserves. It is a famous gold and copper mineralization concentration area in the country. The depth of copper-gold mineralization in the Tongchang-Cinnabar Red area and the Xiyuanling area in the northwest is greater than 1200m. While strengthening the summary of mineralization zoning rules, we will carry out new geophysical survey methods, increase drilling depth, and search for new hidden ore bodies. There is still hope for a substantial increase in reserves. In addition, similar layered lead-zinc deposits (such as Banzhukeng) in the Nanhua-Sinian system have low workability and good prospecting prospects (Yang Minggui, 2004).

31,000 Years - Yifeng Scenic Area

Main minerals: copper, gold, lead and zinc.

Main deposit types: porphyry type, layered stack modification type, and ductile shear zone type.

This area is located at the contact point between the Jiuling terrane and the Ping-Le combination zone. The NE-trending Yifeng-Nanchang deep fault is a regional rock-controlling ore-controlling structure. It has Mesoproterozoic Yifeng Formation volcanic turbidite and late Paleozoic carbonate mineral-bearing structures. Invasive activities during the Yanshan period were intense. Copper-gold geochemical anomalies are mainly distributed along the volcanic rocks of the Yifeng Formation, and are combined with several gravity and magnetic anomalies. A medium-sized copper-iron-lead-zinc deposit controlled by the front layer of Gao'an Village has been discovered, as well as Luocheng, Yaxi, Pengyuan and other copper deposits related to the Mesoproterozoic Seraphim porphyry system. This area has the metallogenic background conditions for the Dexing porphyry copper deposit. Work in depth and you may have a major breakthrough.

Acknowledgments: This article is a rough understanding of the results of the research project under the "Mineral Resources Evaluation Project in Adjacent Areas of Anhui and Jiangxi". The work has received strong support from the leaders of China Geological Survey, Nanjing Institute of Geology and Mineral Resources, as well as the Geological Survey Institute of Jiangxi Province and Anhui Province, metallurgy and other geological exploration units, as well as the majority of geological prospecting workers.

Here, I would like to express my deep gratitude!

References

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Mineralization and Ore Searching Perspective in Anhui-Jiangxi Provinces

He Jurui, Wang Aiguo, Zeng Yong, Rui Xingjian

(Nanjing Institute of Geology and Mineral Resources, Nanjing 210016)

< p>Abstract: There are four systems of mineralization in Wan-gan area: Mesoproterozoic benthal volcanic system; Neoproterozoic benthal hydrothermal sediment system; Late Paleozoic hydrothermal sediment (upper cumulation) system and Mesozoic volcanic-intrusive magma system. Recently, we have got a lot of new outputs and developed nine ore strips. Synthetical information show that ten perspective districts of ore-prospecting can be considered as the emphases in the next ore-perambulation.

Key words: Wan' g an Area; Mineralization system; Perspective of ore-prospecting district