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The Coexisting Clinopyroxene-Garnet Acidometer and Acidity Facies of Skarn deposits

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Acta Geologica Sinica(English Edition) 1990年第3期64卷 299-308页

作者： Lin Wenwei institute of mineral deposits,{3., beijing Liu Linqun institute of mineral deposits Chinese Academy of Geological Sciences Beijing

On the basis of geological studies of skarn deposits in china and by using thermodynamic models of thesolid solution, the coexisting clinopyroxene-garnet pair in skarn deposits has been analysed and a coexistingclinopyroxene-garnet acidometer developed. They can be used to estimate the medium condition under whichthe skarn was formed. The research on the acidity for the formation of various metallic skarn deposits in chinasuggests that skarns endowed with dissimilar types of mineralization and occurring in diverse environments dif-fer in the acidity conditions for their formation and in the trend of acidity variation of ore-bearing fluid. This,coupled with the study of oxygen fugacity of coexisting minerals, makes it possible to establish the oxygenfugacity-acidity facies of skarn deposits, which reflect the close genetic relationship between the metallizationand the formation of skarn.

关键词： OH The Coexisting Clinopyroxene-Garnet Acidometer and Acidity Facies of Skarn deposits

mineralization episode of porphyry copper deposits in the Jinshajiang-Red River mineralization belt: Re-Os dating

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Science china Earth sciences 2005年第2期48卷 192-198页

作者： WANG Denghong, QU Wenjun, LI Zhiwei, YIN Hanlong4 & CHEN Yuchuan institute of mineral Resources, chinese academy of geological sciences,{3., china National Center of Rock and mineral Analysis, chinese academy of geological sciences,{3., china Resource Assessment Center of Yunnan, Kunming 650011, china institute of Geology and Geophysics, chinese academy of {13., beijing 100101, china chinese academy of geological {13.,{3., china 1. institute of mineral Resources Chinese Academy of Geological Sciences 100037 Beijing China 2. National Center of Rock and mineral Analysis Chinese Academy of Geological Sciences 100037 Beijing China 3. Resource Assessment Center of Yunnan 650011 Kunming China 4. institute of Geology and Geophysics Chinese Academy of Sciences 100101 Beijing China 5. chinese academy of geological sciences 100037 Beijing China

Re-Os isotopic dating for the molybdenites from the porphyry copper deposits of the Jinshajiang-Red River mineralization belt in Yunnan Province yields isochron ages of 3..9±1.1 Ma for the Machangqing deposit and 3..4±0.5 Ma for the Tongchang deposit. This result shows that both the Machangqing and the Tongchang porphyry Cu-Mo deposits from two different ore-fields formed simultaneously. This new data and the published Re-Os model ages of molybdenite (3..4 Ma, 3..9 Ma, 3..2 Ma) of the Yulong porphyry copper deposit in Tibet, which is located in the same Jinshajiang-Red River mineralization belt as the Machangqing deposit and the Tongchang deposit, suggest that these three Cenozoic porphyry copper deposits in the Jinshajiang-Red River mineralization belt were contemporary for their mineralization episode. That is to say, even their present locality is far away and nearly iso-distantly distributed, these three porphyry Cu(Mo) deposits belong to the same mineralization episode at the end of Eocene.

关键词： Re-Os isotopic dating, porphyry Cu deposits, Cenozoic, mineralization episode.

geological Setting of the Porphyry Copper Deposit Series of china

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Acta Geologica Sinica(English Edition) 1992年第1期66卷 59-73页

作者： Zhang Hongtao Rui Zongyao institute of mineral deposits,{3., beijing Liu Linqun institute of mineral deposits Chinese Academy of Geological Sciences Beijing

In accordance with the terms global minerogenic series, regional metallogenic series and ore depositsystem which are put forward here, metallogenic environments at different levels are discussed for theporphyry copper deposit series in china. It is considered that the porphyry copper deposits in china arecontrolled not only by the boundaries of convergent plates but, more importantly, by the boundaries ofintraplate divergent mobile belts and those between continental blocks. Besides, the emplacement ofhypabyssal and supper-hypabyssal calc-alkaline magmas and the temporal-spatial distribution of china'sporphyry copper deposits are governed by the superimposition of fracture systems of the pre-Alpine base-ments. Meso-Cenozoic cover and continental-margin new-born crust. Such a superimposition has also re-sulted in the polycyclicity of the mineralization.

关键词： Zhang geological Setting of the Porphyry Copper Deposit Series of china

^(40)Ar/^(3.)Ar dating of shear deformation of the Xianshuihe fault zone in west Sichuan and its tectonic significance

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Science china Earth sciences 2004年第9期47卷 794-803页

作者： ZHANG Yueqiao1, CHEN Wen2, 3.& YANG Nong1 1. institute of Geomechanics, chinese academy of geological sciences, beijing 100081,{3. 2. institute of Geology, chinese academy of geological sciences, beijing 100037,{3. 3. institute of Geology and Geophysics, chinese academy of sciences, beijing 100029,{3. institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

Based on field geological survey, structural measurements and classical Ar/Ar dating of mica, biotite and K-feldspar, we obtain cooling ages for Miocene left-lateral shear along the Xianshuihe fault zone. The results document two thermal events during the sinistral shear. The early event (12-10 Ma) corresponds to rapid cooling of the Zheduoshan granitic massif from above 700℃ to below 3.0℃. The late event (5-3.5 Ma) corresponds to cooling of granites intruded along the eastern side of the fault zone. These dating results provide important thermochronological constraint on the timing of late Cenozoic eastward extrusion of the Chuan-Dian Block in the SE Tibetan margin.

关键词： Xianshuihe fault zone, Zheduoshan granitic massif, sinistral shear deformation, 40Ar/3.Ar dating, late Cenozoic.

The effects of K^+ growth conditions on the accumulation of cesium by the bacterium Thermus sp. TibetanG6

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Science china(Life sciences) 2006年第2期49卷 123-129页

作者： WANG Hailei1,2,3. KONG Fanjing1,2,3.& ZHENG Mianping1,2,3.1. R&D Center for Saline Lake and Epithermal deposits, chinese academy of geological sciences, beijing 100037,{3. 2. Key Open Laboratory of Saline Lake Resources and Environment, chinese academy of geological sciences, beijing 100037,{3. 3. institute of mineral Resources, chinese academy of geological sciences, beijing 100037,{3. R&D Center for Saline Lake Epithermal deposits Chinese Academy of Geological Sciences Beijing 100037 China Key Open Laboratory of Saline Lake Resources Environment Chinese Academy of Geological Sciences Beijing 100037 China institute of mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China

The accumulation of cesium by the bacterium Thermus sp. TibetanG6 was examined under different K+ growth conditions. The effects of external pH and Na+ on the accumulation of ce-sium were also studied, and the mechanism involved was discussed. K+ regimes played an important role in the accumulation of cesium by the strain TibetanG6. The quantity of cesium accumulated (24 h) was much higher in K+-deficient regime than that in K+-sufficient regime. The pH and Na+ had different effects on the accumulation of cesium in the two K+ regimes. IR spectra analyses indicated that the biosorption is a process of homeostasis with cesium initially accumulated on the cell wall.

关键词： Thermus sp. TibetanG6, cesium, bioaccumulation, K+-growth condition, pH, sodium, IR spectroscopy.

Late Precambrian Scissors--Type Opening--Closing Tectonics and Its Dynamics in South china

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Acta Geologica Sinica(English Edition) 1996年第2期70卷 109-122页

作者： Xu Zhigang institute of mineral deposits,{3., beijing institute of mineral deposits Chinese Academy of Geological Sciences Beijing

In this paper the author first reviews 6 major advances in the study of Precambrian geologyand tectonics of South china during the last decade, and then proposes the following new modelof Late Precambrian scissors-type opening-closing tectonic evolution in the region. (1) Besidesthe Middle-Late Proterozoic low-grade metamorphic basement, there existed a LateArchaean-Early Proterozoic medium- to high-garde metamorphic basement in South china;both of them formed the united Yangtze-Cathaysia (craton) at the end of the Early Proterozoic,with the Jiangxi-Anhui-Zhejiang palaeogulf extending into the inland and the Jiangxi-Anhui-Jiangsu Peninsula lying on the northern side of the palaeogulf.(2) From the Middle Proterozoic,the present Guangxi-Guizhou-Hunan area in the western-central oldland was subjected toextensional rifting and became a rift trough, thus resulting in counterclockwise rotation of the'Cathaysian block' and clockwise rotation of the 'Yangtze block'; moreover, the southwardcompression of the Dabie-Jiaonan block which split from the southern margin of the Northchina plate and was accreted to the northern margin of the Jiangxi-Anhui-Jiangsu Peninsula ledto the scissors-type closing of the Jiangxi-Anhui-Zhejiang palaeogulf during the Middle-earlyLate Proterozoic, which further influenced the Early Palaeozoic tectonic evolution of the region.

关键词： Yangtze-Cathaysia Jiangxi-Anhui-Zhejiang palaeogulf Late Precambrian scissors-type opening-closing tectonics

Kaolin deposits of Weathering-Residual in the Coastal Area of Guangdong Province

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Acta Geologica Sinica(English Edition) 1991年第3期65卷 289-305,340页

作者： Zhou Guoping Lin Yuchuan institute of mineral deposits,{3., beijing,Center of geological Analysis of Guangdong Province, Guangzhou institute of mineral deposits Chinese Academy of Geological Sciences Beijing China

Kaolin deposits of weathering-residual type make up a large proportion in different types of kaolin depos-its and are widely used in ceramics, electron ceramics, rubber and paper industries. This paper discusses sys-tematically this type of kaolin deposit with respect to their features of occurrence, mineralogical and chemicalcomposition and transformation of minerals during supergene processes, thus providing some basic data forthe rational exploitation and utilization of the kaolin resources.

关键词： Kaolin deposits of Weathering-Residual in the Coastal Area of Guangdong Province

The possible contribution of a mantle-derived fluid to the Ningwu porphyry iron deposits—Evidence from carbon and strontium isotopes of apatites

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Progress in Natural Science:Materials International 2008年第2期18卷 167-172页

作者： Jinjie Yu ,Jingwen Mao,Changqing Zhang institute of mineral Resources,chinese {3. of geological Science,beijing 100037,china institute of mineral Resources Chinese Academy of Geological Science Beijing 100037 China

Apatite is a characteristic mineral for the iron deposits in the Ningwu region. Apatite shows a range of d13.PDB values from à9.6& to à0.6&,and most of them with the d13.PDB values distributed in a range of mantle carbon (i.e.,à2& to à9&),except for samples T-06-1 and J-06-3. Apatites in the Ningwu porphyry iron deposits yield a narrow variation range of 87Sr/86Sr values from 0.7063.6 to 0.707577,similar to those of the volcanic and subvolcanic rocks and higher than that of a typical mantle-derived magmatic apatite (i.e.,about 0.7040),indicating that formation of the apatites was involved with crust material contamination. d13.PDB and 87Sr/86Sr values of the apatite indicate a possible contribution of mantle-derived fluid and material to formation of the Ningwu porphyry iron deposits,supported by regional geology,regional gravities and geochemistry of the volcanic and subvolcanic rocks in the Ningwu region.

关键词： Apatite 87Sr/86Sr ratios Fluid inclusion d13. Mantle fluid and material

Geochemical characteristics and contemporary metallogenetic process of hot springs in Tengchong

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chinese Science Bulletin 1999年第S2期44卷 29-30页

作者： HU Yunzhong, WANG Haiping and ZHANG Tianle institute of mineral deposits,{3., beijing 100037, china institute of mineral deposits Chinese Academy of Geological Sciences Beijing 100037 China

1 The Geochemical characteristics of hot spring systems THE characteristic element abundance value/concentration coefficients of the geochemical characteristics ofTengchong are: Au-6.10/4.07, As-7.13.3.96, Sb-1.25/6.23. Pb-3..87/2.47, Th-20.25/2.11, Cd-0.57/2.83. Li-40/2, Ti-1.3./2.89 (abundance unit: Au-1 × 10-9, the others-1 ×10-6 ). Generally, these 8 elements can reflect the characteristics of the metallogenetic process with magmatic hydrothermal activities in the area. The abundances of other 3. elements measured are similar tothose of the crust. Granite in the area belongs to the calc-poor granite. Compared with the granite abundance in theworld, Cr, Co, Th, Pb and Cd are the concentrated elements. Their change in the regional distributionshows that Ca, Na, Th, Zn and REE increase from north to south, but Mg, Ti, Ba, Cu, Li, V, Zr,

关键词： hot spring system hydrothermal activity contemporary metallogenetic process.