Metallogenic Conditions Research Articles

Analysis on uranium metallogenic condition of Maoershan volcano collapse basin in Shangzhi county, Heilongjiang province

Analysis on uranium metallogenic condition of Maoershan volcano collapse basin in Shangzhi county, Heilongjiang province

Application of apatite U–Pb and fission-track double dating to determine the preservation potential of magnetite–apatite deposits in the Luzong and Ningwu volcanic basins, eastern China

The Cretaceous Luzong and Ningwu volcanic basins in eastern China contain numerous magnetite–apatite deposits with similar geological characteristics and mineralization ages (~130Ma). These deposits, however, occur at distinctly different burial depths. To explain this difference, LA-ICP-MS apatite U–Pb and fission track double dating of five samples were carried out to establish the thermal histories from crystallization to the exhumation of four representative deposits: the deeply buried Nihe (665–1065m underground) and Luohe deposits (425–856m underground) from the Luzong basin; the shallow Meishan deposit (40–530m underground) and the exposed Dongshan deposit from the Ningwu basin. The cooling histories of the four deposits could be divided into rapid cooling for the Dongshan deposit and slow continuous cooling for the Nihe, Luohe, and Meishan deposits. Combined with geological evidence, it can be determined that the Dongshan and Meishan deposits formed at shallow depths with the Dongshan deposit emplaced at a very high level while the Meishan deposit was emplaced relatively deeper. The Nihe and Luohe deposits were emplaced deeper than the Dongshan and Meishan deposits and the burying of the Shuangmiao volcanic cycle after mineralization increased the burial depth. However, this burial event did not occur in the Ningwu basin. All of these resulted in the different burial of the magnetite–apatite deposits between the two basins prior to 120Ma while the exhumation after 120Ma among these deposits was similarly slow and continuous. The metallogenic conditions of both basins were similar but the smaller number and gross reserve of magnetite–apatite deposits in the Luzong basin, we believe that the Luzong basin has better preservation potential for the magnetite–apatite deposits.

Geology and sulfur isotope geochemistry of Dafulou tin-polymetallic deposit in Dachang orefield, Guangxi, China

No. 22 ore of Dafulou deposit was systematically analyzed for sulfur isotopes. The results show that the δ34S values of sulfide minerals, ranging from −0.154 to +0.218% and with an average value of +0.114 1%, are mostly positive and characterized by rich sulfur (S) content. This suggests that the sulfur of the Dafulou ore deposit is derived from magma and relates to the Longxianggai concealed granite, which points to the important role of magma during mineralization and implyies the product of the active continental margin. By comparison between the Dafulou and the Kengma tin deposit, significant differences exist in the sulfur isotope composition. In the Kengma deposit, the sulfur isotope composition is characterized by the high negative value, which is different from the Dafulou tin-polymetallic deposit. The difference of the enrichment and fractionation of the sulfur isotope is the synthesized result of the metallogenic conditions. It also has the difference in the metallogenic environment and metallogenic characteristics of the deposit in the same ore belt.

Study on Geochemical Characteristics of the Sb Polymetallic District in Da Zhuang of Kai Yuan County in Yunnan Province

Southeast Yunnan Area is an Important Nonferrous Metals Mineral Resources Base in Yunnan Province, with Good Metallogenic Conditions. the Structure Characteristics of Kai Yuan Da Zhuang Mining Area is more Complex, with Favorable Conditions for Mineralization. Based on Detailed Geological Investigation, Combined with the Geochemical Data and Geological Setting, Deposit Features of Da Zhuang Antimony Ore Deposit and Summarizes Geochemical Characteristics, that is to Study the Genesis of this Deposit and is to Predict the Mining Ore.

Geological Characteristics of the Changdong-Manxu Pb-Zn Deposit in Ninger, Yunnan and its Ore-Search Prospects

Since the 1950s, the Changdong-Manxu Pb-Zn deposit has ever been explored for ore bodies by a number of Geology Parties，On the basis of studying the regional metallogenic geological background, Geologic characteristics of the deposits, ore-controlling geological factors, they thought the deposit belongs to sedimentary transformation type stratabound lead-zinc ore deposit ,which controlled by fault structures. According to the features of ore-controlling fault features and metallogenic conditions，it is possible to find large to super-large ores inside and outside the tectonic zones of the deposit.

Geochemical Characteristics and Ore Prediction of the Pb-Zn Polymetallic District in Kanmashan of Lancang County, Yunnan

According to the analysis of geological characteristics and Elemental correlation charac –teristics, Threshold and R-factor analysis leading to the results geochemistry characteristics of Kanmashan Pb-Zn polymetallic deposit which is located in Lancang county of Yunnan province, the deposit is discovered in the southern arc of Chong mountain-lincang-menghai mountain, alonging the contact strip of Lincang granitoid batholith and proterozoic group in LanCang, metallogenic conditions near fracture is relatively ideal, which can be used as a further work area.

A new type of micro-disseminated gold deposits in association with diabase found in Yunnan and Guizhou provinces and Guangxi Zhuang Autonomous Region—Their geological characteristics and metallogenic conditions

With the continuous development of gold ore prospecting and exploration in recent years a new type of micro-disseminated gold deposits have been found in the regions of Southwest Guizhou Province and Northwest Guangxi Zhuang Autonomous Region, with the orebodies directly occurring in diabase or in the contact zone between diabase and strata. The orebodies are strictly controlled by fault structures. The discovery of this type of gold deposits has brought about new prospects for gold ore prospecting in the Yunnan-Guizhou-Guangxi Golden Triangle region. From the preliminary analysis of the geological characteristics of the Qiaoxiang gold deposit in Wangmo County, in combination with the results of research work in the adjacent areas in recent years, this paper roughly described the geological characteristics and metallogenic conditions of this type of gold ore deposits with an attempt to make more and more geologists pay enough attention to this type of gold ore deposits, so as to promote gold ore prospecting in Guizhou Province to develop toward a variety of types of gold deposits in all round way.

Analysis of Metallogenic Conditions of Geothermal Resources in Heiyu Lake of Daqing

Heiyu Lake zone of Daqing is located in the southwest hollow borderland of Heiyu Lake and on the arching transitional zone of Daqing placanticline. Based on the geological background of Heiyu Lake, this paper analyzes the landform, the regional geological structure, the formation lithology and the irruptive rock and other metallogenic conditions in detail. The indispensable geological conditions for forming geothermal field in layers were summed up. Combining with the development characteristics and geophysical data of formation, the bore hole site of geothermal well and target stratum were ascertained. The four major elements of forming geothermal resources in this region were confirmed by carrying out geothermal drilling.

Geological Features of Fuxin Gold Deposit

Fuxin city is a part of low mountains and hills in Liaoning western, the plain and the hill occupy respectively 1/2. Metallogenic geological conditions of gold in Fuxin regions is superior, the types of mineral deposits is diverse, and it is dominated by Antique eon tough shear zone greenstone(mylonite) and altered rock type, volcanic type take second place, potential resource is larger, is an important production base of Liaoning province even the country. Therefore researching the geological characteristics of gold deposits in Fuxin region is of great significance.

Three-Dimensional Geological Modeling and Quantitative Analysis for Geological Ore-Controlling Factors in Fenghuangshan Copper Ore Field

Aiming at the issues for 3-dimensionals localization and quantitative prediction of concealed ore body in the deep and margin parts of the Fenghuangshan ore field in Tongling, Anhui, a quantitative analysis method for geological ore-controlling factors is proposed. Firstly, based on the analysis of metallogenic conditions and integrated geological exploration data, the three-dimensional shapes of the ore-controlling geological bodies such as strata, structures, magmatic bodies and ore bodies were inferred and simulated in three-dimensional visualization environment by dint of three-dimensional geological modeling technology. Secondly, from the three-dimensional grid geological models, some 3-dimensional shapes of some complex ore-controlling geological bodies with overlay surfaces, were analyzed by morphological operations and extracted as the geological ore-controlling factors. Lastly, the field models of various geological ore-controlling factors, including the magmatic body and its surface relief, the contact zone, the strata, the faults and so on, were set up to describe quantitatively geological ore-controlling effects. By analyzing quantitatively the associated relationship between the geological ore-controlling factors and the mineralization distribution, It is proved that the extracted geological ore-controlling factors have more powerful controlling effects on mineralization spatial distribution. The method is feasible to gain the quantitative geological ore-controlling indexes for indicating the ore-formation advantage degree.

Metal deposits in the Da Hinggan Mountains, NE China: styles, characteristics, and exploration potential

The Da Hinggan Mountains mineral province (DHMP), northeastern China, is divided into three tectonic units and corresponding metallogenic belts. The tectonic units of the Da Hinggan Mountains are the Erguna fold zone on the northwest, the Hercynian fold zone on the north, and the Hercynian fold zone on the south. The corresponding metallogenic belts are the Erguna Cu-Pb-Zn-Ag-Mo-Au belt of the NW DHMP, the Cu-Pb-Zn-Mo-Fe-Au belt of the northern DHMP, and the Pb-Zn-Ag-Cu-Sn-Fe-Mo belt of the southern DHMP. Distinct ore bodies, mostly associated with Mesozoic granites and volcanics, comprise (1) hydrothermal vein deposits including Pb-Zn-Ag-(Cu) and W‐Sn-Cu, (2) exhalative (Pb-Zn-Ag, Cu) deposits, (3) porphyry (Cu, Au, Mo), (4) skarn (Fe, Zn, Cu), and (5) epithermal Au-Ag deposits. The hydrothermal veins are hosted by a range of different rock types, whereas the exhalative ores are confined to Permian strata. The porphyry deposits occur within granite porphyries. The epithermal deposits are related to Mesozoic volcanic-subvolcanic rocks and occur within superjacent igneous structures. The first type, represented by the Bairendaba deposit, shows many characteristics of hydrothermal deposits. The second type occurs in a Permian clastic-chemical sedimentary sequence. Most Fe-Zn-Cu deposits related to granites and granodiorites are skarns. Granodiorite and granite-related deposits are typical porphyry ores, formed during Hercynian and Mesozoic time. Promising metallogenic conditions and the recent discovery of many large metal deposits indicate that this mineral province has a great exploration potential.

Geochemical Conditions of Metallization of the Lijiagou Pb-Zn Deposit, Gansu Province

The Lijiagou Pb- Zn deposit in Gansu Province is a syngenetic hydrothermal- depositonal and metamorphosed hydrothermal weakly-reworked stratabound ore deposit. The metallogenic physicochemical conditions of the deposit are thoroughly dealt with in this paper according to its different mineralization stages. Based on the systematic study of metallogenic material sources, it is considered that the ore-forming metals, ore sulphur and water of mineralizing fluids are mainly derived from the basement, reduction sulphur of marine sulfate and infiltrating heated meteoric water and partially recharged sea water, respectively. Finally, the metallogenic model of this deposit is established.

Basic Patterns of Metallogenesis of Precious Metal Deposits in China and Vectors for Prospecting

We have analyzed and summarized the development of exploration of precious metal deposits in China in recent years; their major types, major metallogenic epochs and areas of main concentration of these deposits. On this basis, we summarize the basic metallogenic patterns of gold, silver and platinum group elements (PGE) deposits in China and put forward a prospecting methodology for each of these precious metal deposits. Gold deposits in China consist of various types, and were mainly formed in the Mesozoic and the Cenozoic, and concentrated in Jiaodong, Xiaoqinling, Altay, Jinshajiang-Honghe, Taiwan and southeastern margin of continent, in the Heilongjiang and Yangtze River areas, Yunnan-Guizhou-Guangxi provinces and Shaanxi-Gansu-Sichuan provinces, etc. Silver deposits in China are usually associated with other metals and also formed mainly in the Mesozoic and the Cenozoic. They are hosted by metamorphic, magmatic and sedimentary rocks in orogenic and basin area, are generally fault or fracture controlled. At present, the prospecting potential for silver deposits is in manganese deposits and Mn anomaly areas, especially in the Cenozoic basins in East China. PGE deposits are of three major types: magmatic, sedimentary, and hydrothermal. There are at least eight important metallogenic prospective regions with different geological environment and metallogenic conditions, leading to different prospecting methods.

Location prediction of blind ore-bodies in Shuijingtun Gold Mine, Zhangjiakou, China

By analyzing the metallogenic conditions and prospecting marks of F8 fault belt in Shiujingtun Gold Mine, the geochemical samples were collected along F8 fault belt and prospecting profile normal to the F8 fault belt. Gold and its indicator elements were tested with X-ray fluorescence spectrometry and the content distribution diagram of Au, Ag, Hg and As along the F8 fault belt was performed. The geochemical primary halo model and the Grey system model of F8 fault belt are established. With these element distribution features and models, the blind ore bodies in the F8 fault belt were predicted. Engineering prospect shows that the industrial orebodies have been discovered and the prediction results are dependable.

Assessment of prospecting potentiality for superlarge continental volcanic rock-type uranium deposits in China

The superlarge continental volcanic rock-type uranium deposits, which were discovered abroad long ago, have not yet been reported up to now in China. This is an important problem that needs to be urgently solved by uranium geologists at present. In this paper, on the basis of analyzing the metallogenic settings and geological conditions of the superlarge continental volcanic rock-type uranium deposits discovered in the world along with the metallogenic characteristics of those of the same type in China, the space-time distribution patterns of continental volcanics and the metallogenic potential of main tectono-volcanic belts in China are discussed, and a synthetic conclusion has been drawn that there is a possibility to discover the superlarge continental volcanic rock-type uranium deposits in China. Moreover, it is evidenced that the Ganhang, Nanling, Yanliao, Da Hinggan Ling and other tectono-volcanic belts possess favorable geological conditions for the formation of ssuperlarge ore deposits of the continental volcanic rock type. The intersecting and overlapping locations of the aforementioned main belts with other tectono-volcanic (-intrusive) belts are the most potential areas where the superlarge continental volcanic rock-type uranium deposits would be found.

The study of isotope geology and uranium metallogenic condition of igneous rocks in Guyuan area, China

The study of isotope geology and uranium metallogenic condition of igneous rocks in Guyuan area, China

Metallogenic characteristics and ore-prospecting future of pre-cambrian gold deposits in Mufu-Jiuling district

Mufu-Jiuling district is an important placer gold producing land since the ancient time. In recent years, some primary gold deposits and mineralizations, e. g., Huangjindong and Tulongshan gold deposits, have been found. But the metallogenic conditions and regularities as well as the ore-prospecting future remain to be recognized. Through the study on the metallogenic background and condition, the auriferous source bed and the mineralizing characteristics, three types of primary gold deposits are confirmed to be prospective in this district and some key problems about their prospecting and evaluating are put forward.

Metallogenic conditions of gold-bearing skarn deposits along the middle-lower reaches of the Yangtze River

The authors discussed the metallogenic conditions of gold-bearing skarn deposits along the middle-lower Yangtze River reaches. Gold was enriched in mantle-originated magmas while copper was enriched in crust-originated magmas. So the enrichment of gold in skarn deposits was decided by the M/C ratios of the intrusive rocks. The distribution of these deposits was controlled not only by the localization of the intrusive rocks which were decided by Mesozoic Era-developed large-scaled and deep-seated faults, but also by the favorable stratigraphic horizons.

Vein-type tungsten deposits of China and adjoining regions

Taking the South China Tungsten Province as representative, this paper deals systematically with the geological setting, geometry, paragenesis, wallrock alteration, and geochemical characteristics of Asian vein-type tungsten deposits on the basis of data acquired since the 1970's. The regional metallogenic conditions and the genesis of the deposits are discussed. The large-scale distribution of vein-type tungsten deposits in Asia is inferred to be controlled by tungsten-enriched formations, multi-period and multi-stage granitic activity, and favourable tectonic environment. The deposits are not only controlled by magmatic differentiation, but also by the overall evolution of the continental crust.

A Study on Palaeogeography and Metallogenic Conditions of Early Carboniferous Bauxite Deposits of Old Weathered Crust in Guizhou, Sichuan, Hunan and Hubei Provinces1

Abstract There are four subtypes, namely, la, lb, 1c and Id of the Early Carboniferous bauxite deposits of the old weathered crust type in Guizhou, Sichuan, Hunan and Hubei provinces. They are all distributed in the Upper Yangtze old land. As a result of the Hunan‐Guizhou palaeo‐faulting, the crust on the northern side of the fault was uplifted and became land, thus suffering denudation. The bauxitic substances left in the weathered crust evolved and were reworked into bauxite. On the other hand, the crust on the southern side of the fault sank and remained to be part of an ocean. The bauxite deposits of la and lb subtypes were formed by in‐situ enrichment of residual bauxitic substances in the weathered crust of the old land, but bauxite deposits of 1c and Id subtypes resulted from transportation, accumulation and sedimentation of allothogenous bauxitic substances on the weathered crust of the old land. The processes of transportation may be distinguished as dry transportation and wet transportation, both of which proceeded under atmospheric conditions.