China Nonferrous Metals Resource Geological Survey

China, China

China Nonferrous Metals Resource Geological Survey

China, China
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Ma X.,Peking University | Chen B.,Peking University | Lai Y.,Peking University | Dou J.,China Nonferrous Metals Resource Geological Survey | And 2 more authors.
Acta Petrologica Sinica | Year: 2010

This study presents some new discoveries of the porphyritic quartz in the Aolunhua Cu-Mo deposit, southern segment of Da Xing' an Mountains. Based on the study on the texture, genesis and fluid inclusions in porphyritic quartz, together with the characteristics of hydrothermal veins, the processes of fluids exsolution, evolution and mineralization have been revealed. Porphyritic quartzes are divided into two groups; ( I ) individual porphyritic quartz and ( II ) polycrystal quartz aggregate, characterized by widespread daughter minerals-bearing fluid inclusions, and are of a special product during magmatic-hydrothermal transition. Fluid inclusions data show that a H 2O-CO2-Na-K-Ca-Fe-Cu-Ti-dominated initial fluid with high temperature ( >492CC) and high salinity (up to 47. 6% -58. 7% NaCleqv) separates from magmatic system under the condition that pressure ≥115MPa and depth &4.3km. In hydrothermal stage, fluid boiling results from sharp decrease of pressure, coupled with temperature reduce, lead to large scale mineralization. Characteristics of minerals in veins and microthermometry data demonstrate molybdenite precipitation temperature is above 335°C. The uplift, supported by data of fluid inclusions in porphyritic quartzes, is more than 4. 3km, indicating that the uplift rate is at least 32.6m/Ma. So, the porphyritic quartz can be used to guide exploration as an indicator of fluid exsolution from porphyry, and also provides significant constraints on regional geology evolution.

Liu Z.,Kunming University of Science and Technology | Yang S.,China Nonferrous Metals Resource Geological Survey
Shiyou Diqiu Wuli Kantan/Oil Geophysical Prospecting | Year: 2011

In order to accurately calculate all-time apparent resistivity, the analytic formula of the transient electromagnetic response for ramp turn-off of a large fixed rectangle transmitting loop is derived in the article. During calculations of apparent resistivity, effects of ramp turn-off can be revised and approximations of numerical integration can be avoided. So the calculation precision will be improved greatly and computer time will be less. Calculations using the analytic formula show its special advantage by theoretical practical examples.

Zhu X.-Y.,Beijing Institute of Geology and Mineral Resources | Wang Y.-L.,China Nonferrous Metals Resource Geological Survey | Cheng X.-Y.,Beijing Institute of Geology and Mineral Resources | Li S.-T.,China Nonferrous Metals Resource Geological Survey
Geology in China | Year: 2015

The steeply-dipping wolframite-quartz veins occur on both sides of the top contact zone of early Yanshanian granite, extending about <1000 m in the granite and about <500 m in sediments within the Yaogangxian tungsten deposit of Hunan Province. The sedimentary rocks overlying the granite consist of Precambrian metamorphic sandstone, Devonian sandstones and Triassic carbonaceous siltstone. Arsenopyrite topaz rocks (layers)occur along the sandstone overlying the Triassic-Devonian unconformity, and the tungsten-bearing quartz vein under the rocks (layers) is about 0.3 m in width. The studies of geology and geochemistry show that arsenopyrite-topaz rock mainly originally consists of quartz sandstone, with strong silicification, accompanied by arsenopyrite, topaz, muscovite and some other minerals, suggesting an altered rock. The rocks rich in Si, F, B and ore-forming elements such as W, Bi and Mo are similar to features of quartz veins. The fluid of alteration is the same as ore-forming fluid of quartz vein. The vertical zoning of the Yaogangxian tungsten deposit is different from the "five floor model" of wolframite-quartz veins. There are not veinlet and linear vein zones at the top of the model, but the arsenopyrite-topaz rock layer directly and gently dips over the steeply dipping quartz wide vein(0.3 m). A new metallogenic model for the tungsten bearing quartz vein deposit is suggested in this paper, i.e., "layer in the upper part and vein in the lower part". This model is of significance for the exploration of vein-type tungsten deposits, i.e., under the strongly silicified bedding alteration rocks with arsenopyrite, topaz and muscovite, there might occur steeply dipping wolframite-quartz veins.

Zhang P.-B.,China Nonferrous Metals Resource Geological Survey | Zhang Y.,Central South University | Yang Z.-A.,China Nonferrous Metals Resource Geological Survey | Liu Z.-F.,Central South University | And 3 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2013

Eastern Kunlun, Qinghai Province, China, is located in the west of Qing-Qi-Kun Old Land Edge Deep Fracture Metallogenic Tectonic Belt. The tectonic in Eastern Kunlun went through four large-scale stretching and closing processes, and three third tectonic units formed with Northern Kunlun Fault, Middle Kunlun Fault and Southern Kunlun Fault as boundary, are Qimantage Superimposed Rift Zone in late Proterozoic-early Paleozoic (I), Eastern Kunlun Island-arc Zone in Paleozoic (II) and Abatement Complex Zone in Paleozoic (III). Based on study for geological characteristics of typical deposit and predecessors' material in the Eastern Kunlun, three key copper deposit types for prospecting, were put forward, which are namely porphyry + skarn type Cu polymetallic deposits in the late of orogenic, porphyry type Cu polymetallic deposits in the late of orogenic and copper gold and polymetallic deposits of exhalative sedimentary and superimposed on the transformation of the enrichment by magma in the late Proterozoic. Seven targets for prospecting copper deposits were chosen and the prospecting outlook was analyzed according to the regional metallogenic regularity, and it was pointed out that Xueshanfeng Target of porphyry copper deposit and Dongdatan Target of compound type copper deposit of porphyry and SEDEX have the best prospecting outlook.

Song W.-B.,Central South University | Lai J.-Q.,Central South University | Huang M.,Central South University | Yang Z.-A.,China Nonferrous Metals Resource Geological Survey | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2012

There are two mineralization types in Kaerqueka copper polymetallic deposit in Qimantage area, Qinghai Province, which are skarn-type mineralization and porphyry-type mineralization. Both of the two mineralization types are closely related to Indosinian granodiorite. Fluid inclusions (FI) host in porphyry-type mineralization granodiorite and skarn-type ore, and the fluid inclusions in skarn-type ore typically are aqueous FI (type I) while those in porphyry-type mineralization granodiorite are usually aqueous FI (type I) or daughter mineral-bearing FI (type II) as well. The homogenization temperatures of the fluid inclusions in the skarn-type ore and the porphyry-type mineralized granodiorite vary from 137°C to 322°C and 274°C to 495°C, respectively. The salinities of skarn-type ore range from 0.7% to 12.7% (mass fraction, NaCl equiv); and those in porphyry-type mineralized granodiorite range from 5.9% to 59.1%. The study demonstrates that the ore-forming fluids originate from magma which is high-temperature (up to 500°C), hypersaline (up to 60%), rich in Na + and metallogenic material, with the characteristics of ultrahigh pressure. Fluid-boiling occurs when the ore-forming temperatures are between 290°C and 320°C because of breaking of wall rocks. Then the composition and physicochemical properties of ore-forming fluids are changed by mixed extraneous fluids, leading to the precipitation and enrichment of metallogenic material.

Zhao X.-X.,Central South University | Liu Z.-F.,Central South University | Zhang P.-B.,China Nonferrous Metals Resource Geological Survey | Liu Q.-Q.,Central South University | And 2 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2012

The characteristics of the Xinzhuang gold geological were summarized, the deposits geochemical characteristics of trace element, rare earth elements and isotope were studied, and the genesis of deposit was researched combined with the ore-forming material source, mineralization type, mineral assemblages and mineral fabric, wall rock alteration and pattern of metallogeny. The results show that vein ore bodies are controlled by the NW and NNW fault structures obviously. Ore types have multi-format, multi-minerals assemblage characteristics. The source rocks of the rock body originate from the earth's crust, and magmatic activities of Yanshanian provide a large number of ore-forming material and ore-forming fluid. The ore genesis of Xinzhuang Gold Deposit has the low temperature filling quartz vein type related to the Yanshanian mediosilicic-acid magma intrusion activities.

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