Kunming Sinotech Mineral Exploration Co.

Kunming, China

Kunming Sinotech Mineral Exploration Co.

Kunming, China

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Hu Y.,Kunming University of Science and Technology | Zhao Y.,Kunming Sinotech Mineral Exploration Co. | Liu L.,Kunming University of Science and Technology | Wang J.,Shaanxi Institute of Geology and Mineral Exploration | Li W.,Kunming Prospecting Design Institute of China Nonferrous Metals Industry
Geotectonica et Metallogenia | Year: 2014

The Qinglong antimony deposit is an important kind of antimony mineralization in China, which is located in southwestern Guizhou. Magnetotelluric Sounding (MT), ore field structure, and lithofacies studies suggest that the Qinglong antimony deposit occurs in a half-graben and ramp sag. MT survey demonstrates that the Qingshanzhen fault extends into the basement of the Nanpaniang-Youjiang sedimentary basin and controlled the volcanic facies in the Qinglong antimony deposit. Moreover, this fault zone may also be a boundary fault or a key fault for the Dachang half-garben. Drilling and mapping revealed a paleo-apophysis above which occur the antimony ore bodies in the Qinglong Sb deposit. The secondary NE-striking faults, which cut only the topper of the Maokou Formation, the Dachang Layer, and lower Emeishan Basalt, control the ore deposits. Sandstone flow rolls and shear joints are found in the Longtan Formation at the surface, indicating the NE-striking faults might be a growth fault. Geochemical data and the new finding of paleo oil-pool in the Qinglong antimony district suggest that ore-forming fluid was mainly derived from basin fluid. The Dongwu unconformity acted as a lateral migration pathway for the ore-forming fluid. The Dachang Layer was formed above the unconformity interface within which many Carlin-type gold deposits and antimony deposits developed. The Qingshanzhen fault acted as a vertical migration conduit for the ore-forming fluid which derived from the depth of the basin or basin-basements. The Dachang paleo-apophysis is the destination for the ore-forming fluid, and hosts the antimony orebodies. The secondary NE-striking faults are believed to be the key or the last vertical conduits to transfer the ore-forming fluid to the favorable location. The recognization of the half-graben is important for the future resource exploration in the Qinglong antimony district. ©, 2014, Science Press. All right reserved.


Wang J.,Kunming University of Science and Technology | Wang J.,Sinotech Minerals Exploration Co. | Wang J.,Kunming Sinotech Mineral Exploration Co. | Fang W.,Kunming University of Science and Technology | And 2 more authors.
Advanced Materials Research | Year: 2012

According to the primary study on the As contamination in soil and crops including potato and pea in tin tailings in Gejiu area, Yunnan Province, it has been found that concentrations of As in rhizosphere far exceed Chinese National Grade III standard of soil environmental quality of China (GB 15618-1995). It also has been found that the Ferns were living in the tin tailings suffered from the contamination of heavy metals. Compared with the limit of national criteria for food sanitation in China, the concentrations of As in edible parts of ferns are 90 times. Therefore, the remediation of soil based on geochemical distribution characteristics of heavy metal in the tailings is demanded. And avoiding crops-planting in the tailings to reduce the diffusion of heavy metal contamination in food chain of mining area is necessary. © (2012) Trans Tech Publications, Switzerland.


Du Y.,Beijing Research Institute of Geology for Mineral Resources | Du Y.,Kunming Sinotech Mineral Exploration Co. | Fang W.,Beijing Research Institute of Geology for Mineral Resources | Fang W.,Kunming Sinotech Mineral Exploration Co. | And 3 more authors.
Geotectonica et Metallogenia | Year: 2014

The gabbro intrusion-related structures are quite complex, which include dyke, sill, stock, and apophyses, in the Yinmin Fe-Cu deposit, Dongchuan. The spatial distribution of the iron-copper ore-bodies are closely related to gabbro intrusions. Both of ore bodies and gabbros were controlled by the secondary SN-trending, NW-and NE-trending fractures or faults developed in the core part of the Luoyin compound fault-fold belt. Three zones, i.e., intrusion-related structure lithofacies zone, hydrothermal alteration breccia lithofacies zone, and hydraulic crack-cataclastic lithofacies zone, are observed from the center of the intrusion-related structure to its rims. The three structure lithofacies zones are the major ore-bearing structures in the region. Therefore, these ore-bearing altered lithofacies zones are plausible loci for iron-oxide copper gold (IOCG) deposit and hydrothermal vein-type copper deposit prospecting. The main ore-hosted hosting structure styles are include the gabbro intrusion-related structures of gabbros, crypto-explosive breccia pipe, albite brecciated lithofacies zone, overprinting structure of the Luoyin compound fault-fold belt and intrusion-related structures of gabbros, superimposed structures between intrusion-related structures of gabbros and unconformity structure. All of them jointly controlled different styles of mineralization series and deposit-types (diversity of mineralization). Therefore, the gabbro-related structures should be the priority target of the future exploration for the iron oxide copper-gold deposits in the Xiaoliukou Group (Ar3-Pt1x) and at the east wing of the Luoyin compound fault-fold belt in the Yinmin area. ©, 2014, Science Press. All right reserved.


Nie T.,China University of Geosciences | Nie T.,China Building Material Industry Geological Exploration Center | Fang W.,Beijing Institute of Geology for Mineral Resources | Fang W.,Kunming Sinotech Mineral Exploration Co. | And 2 more authors.
Geotectonica et Metallogenia | Year: 2014

The Yinmin iron-copper deposit with complex geological structure patterns experienced multi-stage geological evolution. In order to study the geometry of the Luoyin fault-fold belt, an east-west direction geological profile is mapped based on underground tunnel observation, and drilling hole-logging, of three levels from 2472 m, 2350 m, and 2230 m levels in the Yinmin iron-copper mine. In addition, the geological evolution of structure deformation is reconstructed based on structural analysis, of the Luoyin overturned compound fault-fold belt. To delineate the ore-controlling mechanism of the deposit, a rose-diagram of the fault-fracture was depicted based on the data from the above mentioned tunnels at the three levels. This study showed that fault-fractures at the depth of the Yinmin iron-copper deposit are in anti-fan-shape and are structurally concordant with morphological characteristics of the Luoyin overturned compound fold. In conclusion, the orebodies of the Dongchuan-type copper deposit and Xikuangshan-type iron-copper deposit were strictly controlled by the Luoyin fault-fold belt. Therefore, it may be predicated that the depth of the east limb of the Luoyin fault-fold belt might be plausible for exploration of the Dongchuan-type copper deposit and Xikuangshan-type iron-copper deposit. ©, 2014, Science Press. All right reserved.


Fang W.,Beijing Institute of Geology for Mineral Resources | Fang W.,Kunming Sinotech Mineral Exploration LLC
Geotectonica et Metallogenia | Year: 2014

In order to promote the exploration and develop new exploration techniques for IOCG deposits at depth, the relationships between the Proterozoic iron oxide copper gold (IOCG) deposits on the western margin of the Yangtze massif, and the Proterozoic major tectonic-magmatic events along with their tectonic evolution are discussed in this paper. There is an unconformity between the Yinmin Formation of the Middle Proterozoic Dongchuan Group and the Late Archean to the early Proterozoic Xiaoliukou Association. SHRIMP U-Pb dating of zircon from the layered-bedded albitite in the Archean to the early Proterozoic Xiaoliukou Association which hosts the Cu-Co-Au-Ag-REE-Fe orebodies yields an age of 2520±14 Ma. Nevertheless, issues such as the unconformity-type of the Cu-Co-Au-Ag-REE-Fe mineralization and formation mechanism of hydrothermal breccia in the Xiaoliukou Association in Yunnan province are still open to debate. The relationships between the Proterozoic IOCG deposits and major tectonic-magmatic events of the Yangtze massif are propsed as the followings. Firstly, after following the Dongchuan Orogenorogenic movementy (Hudsonian Orogeny, ca. 1800 Ma±), the basement tectonic layer of the contin¬ental crust on the Yangtze massif could have been formed. However, Tectonictectonic-magmatic emplacement events of the mantle upwelling occurred in the early Mesoproterozoic age (1700±50 Ma), resulted the Yangtze massif split and the formation of the rifted basin. Basin-tectonic dynamics for the east-west-trending rifted basin was characterized by the volcano-graben basin at the early stage of the continental rifted basin. The first peak of IOCG diagenesis-mineralization period (1650±50 Ma) took place during the emplacement of the alkaline Fe-Na-rich basic rocks, Fe-K-rich trachyte, the Fe-rich diabases and gabbros along with the contemporary eruptions of volcanic rock of similar compositions, as exampified by the Dahongshan IOCG deposit in Yunnan province, China. Secondly, the mature stage of the rifted basin occurred during the Heishan Period and developed of the Middle Proterozoic Dongchuan Group, during which the tectonic dynamics was character¬ristics werezed by of basin-rifting subsidence in the rifted basin of mature development period. The event of hot mantle upwelling and emplacement occurred, and resulted in the tectonic-magmatic events and mineralization in the Heishan Period. The second IOCG mineralization peak (1500±50 Ma) was associated with the emplacement of the alkaline Fe-Na-rich basic rocks, Fe-K-rich trachyte, and underwater igneous carbonatite were produced at the sea bed while a variety of as well as marine volcanic lithofacies, such as volcanic eruption facies and volcanic exhalatives sedimentary facies, developed atin the rifted basin. At the same time, the second diagenesis-mineralization peak (1500±50 Ma) for the IOCG deposits started,, and the Yinachang IOCG deposit as theis a representative of the Yinachang IOCG deposit in Yunnan province, China. Thirdly, when the Xiaoheiqing or the Manyingou Orogeny (1000±100 Ma, the Grenville Orogeny) in Yunnan and Sichuan provinces was onset, the nearly north-directed subduction of oceanic crust, i.e., continental margin lateral compressional and shrinkage on the southern margin of the Yangtze massif, was commenced at the beginning of the Grenville Orogeny. Actually, the Grenville Orogeny resulted in the tectonic inversion of the rifted basin. Simultaneously, a series of alkaline Ti-Fe-rich gabbro and diabase intrusions emplaced, and they were accompanied by syn-tectonic brittle-ductile shear zones. The Manyingou orogeny or the Xiaoheiqing orogeny (the Grenville Orogeny) was responsible for the formation of a regional angular unconformity and disconformity in Yunnan and Sichuan provinces. The third peak (1000±100 Ma) of the IOCG diagenesic-metallogenic period could have beenmay be closely related to the alkaline Ti-Fe-rich gabbro and diabase intrusions with syn-tectonic brittle-ductile shear zones. The Baixila and Xintang IOCG deposits in Yunnan province are the representatives of the IOCG deposits. However, these IOCG deposits are of the Ti-high series IOCG deposits, whereas diagenesis-mineralization of the pre-existing IOCG deposits were superimposed by the alkaline Ti-Fe-rich gabbro and diabase emplacement with syn-tectonic brittle-ductile shear zone. Finally, on the one hand, the interiors and margins of the Yangtze massif were typified by the pattern of multiple tectonic system coupling and transformation during the Jinning-Chengjiang movement, that is, conversion of orogenic belt and sedimentary basin with the deep mantle plume upwelling. Therefore, emplacement of alkaline Fe-rich mafic gabbro with OIB source characteristics, led to the formedation of in the fourth peak (800±50 Ma) of the IOCG deposits diagenesis and mineralization period with which is coincident with the peak of regional metamorphism. On the other hand, the IOCG deposits and the Dongchuan-type copper deposits were superposed by Cu-bearing quartz veins derived from basin-fluid, and further enriched by basin-to-mountain transformation and coupling during the Chengjiang movement. ©, 2014, Science Press. All right reserved.

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