印尼中加里曼丹波拉湾煤勘探区的构造解析     

杨雄庭  王泽安 《湖南地质》1996,15(4):234-238

本文从区域构造背景出发，根据波拉湾煤勘探区地表及钻孔资料综合分析，建立了逆冲断层Ｆ１、Ｆ２及其配套的ｆ１、ｆ２……构造，理顺了错综复杂的构造格局，将推覆构造理论成功地用于援外生产实践。  相似文献   

Oxygen Isotope Exchange Kinetics Between Coexisting Minerals and Water in the Aral Granite Pluton of the Altay Mountains, Northern Xinjiang   总被引：2，自引：0，他引：2  

Liu Wei  Research Center of Mineral Resources Exploration  Chinese Academy of Sciences  Chinese Academy of Sciences  BeijingHe Baichu  Changsha Institute of Geotectonics  Chinese Academy of Sciences  Changsh  Hunanand Chen ZhenshengYichang Institute of Geology  Mineral Resources  Chinese Academy of GeologicalSciences  Yichang  Hubei 《《地质学报》英文版》1996,70(4)

Coexisting quartz, feldspar and biotite vary widely in their δ18O values and display a remarkable 18O/16O disequilibrium relation; especially, a quartz-feldspar reversal (△ 18OQUartz_feldspar< 0) exsists in the Aral granite pluton of the Altay Mountains, northern Xinjiang. The 18O / 16O exchange reaction definitely occurred between granite and water. Initial δ18O values of the granite and exotic fluid are evaluated by the mass balance consideration. The conventional method of discrimination between various magma derivations simply with δ18O values of either whole rock or separate minerals is misleading and unreliable. Experiments carried out by the authors show that the 18O / 16O exchange reaction is not accompanied by what geologists describe as petrological and mineralogical alteration effect. This decoupling relation implies that exchange reaction occurs at a relatively high temperature during subsolidus-postmagmatic cooling of magmas. The exchange mechanism is mainly diffusion-controlled. It is  相似文献   

南极乔治王岛中——新生代岩浆岩Sr—Nd—Pb同位素组成及源区特征   总被引：7，自引：1，他引：7  

邢光福  陶奎元 《岩石学报》1997,13(4):473-487

对乔治王岛１１个火山岩和２个侵入岩样品做了Ｓｒ－Ｎｄ－Ｐｂ同位素分析，其中（８７Ｓｒ／８６Ｓｒ）ｉ＝０．７０３２６～０．７０３９２，εＮｄ＝３．０２～６．７２，２０６Ｐｂ／２０４Ｐｂ＝１７．７７６～１８．５１５，２０７Ｐｂ／２０４Ｐｂ＝１５．．５０６～１５．５７１，２０８Ｐｂ／２０４Ｐｂ＝３７．８６８～３８．３０８。根据以上同位素组成及其相互关系并结合岩石学和微量元素特征及火山岩中熔融包裹体成分，得出以下结论：（１）研究的乔治王岛岩浆岩起源于亏损地幔（ＤＭＭ）和地幔流体交代成因的富集地幔ＥＭＩ混合形成的源区；（２）该源区具有广义Ｄｕｐａｌ异常，它正是由于ＥＭＩ组份加入即通过流体交代作用而产生的；（３）流体主要是俯冲深海沉积物脱碳酸盐作用而释放出的富ＣＯ２流体。  相似文献   

江苏煤层气资源分析     

傅学海  马筱英 《江苏地质》1997,21(2):120-123

简要地归纳了江苏省煤层气的成矿地质环境，分析了成煤区地质构造特征、煤层及围岩储层的物性特征，在此基础上，对主要地区煤层气资源进行了估算。  相似文献   

Relocation of the October 9, 1505 Earthquake with M63/4     

Dong Ruishu  Xiang Hongfa  Guo Shunmin  Ran Hongliu  and Fu ChanghongInstitute of Geology  SSB  Beijing  China Institute of Geophysics  SSB  Beijing  China 《中国地震研究》1997,(4)

There have been 12 possible locations of the earthquakes occurring in the South Yellow Sea since 1505.In this paper,the location of the earthquake that occurred in 1505 has been determined by the collection of more historical data of the influenced field,referring the isoseismal data of earthquakes with the epicentral intensityⅨ and combining geophysical field data with tectonic condition,due to its great influence on seismic safety assessment of some significant engineering.  相似文献   

Tectonic Evolution of the Himalayan Collision Belt   总被引：5，自引：0，他引：5  

Cui Junwen Institute of Geology  Chinese Academy of Geological Sciences  Beijing 《《地质学报》英文版》1997,71(2):133-143

This paper discusses the tectonic divisions of the Himalayan collision belt anddeals with the tectonic evolution of the collision belt in the context of crustal accretion in thefront of the collision belt, deep diapirism and thermal-uplift extension and deep material flow-ing of the lithosphere-backflowing. Finally it proposes a model of the tectonic evolution-progressive intracontinental deformation model-of the Himalayan belt.  相似文献   

Mineralization Ages of the Jiapigou Gold Deposits,Jilin   总被引：1，自引：0，他引：1  

Li Junjian  Shen Baofeng  Mao Debao  Li Shuangbao  Zhou Huifang  Cheng Yuming Tianjin Institute of Geology  Mineral Resources  Chinese Academy of Geological Sciences  Tianjin Nonferrous Metal Geological Exploration Bureau  Changchun  Jilin 《《地质学报》英文版》1997,71(2):180-188

The Jiapigou gold deposits are typical vein type deposits associated withArchaean greenstone belts in China. According to the crosscutting relationships between dykesand auriferous veins, single hydrothermal zircon U-Pb dating and quartz K-Ar,~(40)Ar-~(39)Ar andRb-Sr datings, the main mineralization stage of the Jiapigou deposit has been determined to be2469-2475 Ma, while mineralization superimposition on the gold deposit occurred in1800-2000 Ma and 130-272 Ma. They form a mineralization framework of one oldermetallogenic epoch (Late Archaean-Early Proterozoic) and one younger metallogenic epoch(Mesozoic) of gold deposits in Archaean greenstone belts in China.  相似文献   

Spatial-temporal Frame,Evolution and Mineralization of the Northern Qilian Metallogenic Province   总被引：1，自引：0，他引：1  

Sun Haitian  Wu Jieren  Li Jinping Institute of Mineral Deposits  Chinese Academy of Geological Sciences  Beijing Xi''an Institute of Geology  Mineral Resources  Chinese Academy of Geological Sciences  Xi''an  Shaanxi Institute of Mineral Deposits  Chinese Academy of Geological Sciences  Beijing 《《地质学报》英文版》1997,71(2):204-216

Four metallogenic epochs occurred in different tectonic environments during theevolution of the Northern Qilian metallogenic province through the geological time. The Mid-dle Proterozoic metallogenic epoch witnessed the tectonic environment of crustal breakupcaused by mantle diapirism, in which ultramafic-mafic rocks were intruded along beep faultbelts and the superlarge Jinchuan magmatic Cu-Ni sulphide deposit was formed. In theMiddle-Late Proterozoic metallogenic epoch the crust was further broken to form anintracontinental rift, in which the Chenjiamiao style massive Cu-Fe sulphide deposits hosted bybasic volcanic tuff were formed in the lower volcano-sedimentary sequence, while the largesedex type Jingtieshan style Fe-Cu deposits were formed within the upper abyssal carbon-richargillaceous sedimentary sequence. The Early Palaeozoic saw the aulacogen environment, with-in which the Baiyinchang style superlarge massive base and precious metal sulphide depositshosted by quartz keratophyric tuff were formed in the Middle-Late Cambrian rifted island arcand the massive Cu-Zn sulphide deposits and magmatic chromite deposits associated with theophiolite suite were formed in the Early-Middle Ordovician, and the Honggou style massiveCu-Fe sulphide deposits hosted by spilite were formed in the Late Ordovician back-arc basinenvironment. In the Late Palaeozoic-Meso-Cenozoic, the metallogenic province went into anintracontinental orogenic stage characterized by compressive tectonic environment, in whichthere occurred carbonate-quartz vein type and tectono-alteration gold deposits associated withductile-shear structures.  相似文献   

Yixunite and Damiaoite—A Twin of New Native Alloys of Indium and Platinum from the Yanshan Mountains     

Yu ZuxiangInstitute of Geology  Chinese Academy of Geological Sciences  Baiwanzhuan  Beijing 《《地质学报》英文版》1997,71(4):480-485

Yixunite and damiaoite Were found in a cobalt- and copper-bearing platinum ore vein of a contact metasomatic deposit. The chief ore minerals are bornite, chalcopyrite, magnetite and carrollite. The platinum minerals include moncheite, sperrylite, daomanite, cobalt malanite and cooperite. Yixunite and damiaoite occur as immiscible globules, 1.0 to 2.0 mm in diameter. Yixunite is always in the central part of a globule. It is opaque with metallic lustre, bright white colour and black streak. HM = 5.8; VHN50 = 634 kg/mm2 (573-681 kg/ mm2); insoluble in HCl, HNO3, HF or H3PO4; no cleavage; no magnetism. Density is hard to measure because of small grain size. Calculated density = 18.21 g/cm3. Reflective colour is bright white with a yellowish tint. Isotropic. The mean analytical results (ranges) (%) are: Pt 82.8 (81.8-83.6), In 16.4(15.6-17.1) and total 99.2. The empirical formula (based on 4 atoms) is Pt2.993 In1.007 . The five strongest lines of X-ray diffraction (hkl, d,I) are 111, 2.30 (100); 200, 1.99 (  相似文献   

Changchengite—A New Iridium Bismuthide-Sulphide from the Yanshan Mountains     

Yu ZuxiangInstitute of Geology  Chinese Academy of Geological Sciences  Baiwanzhuang  Beijing 《《地质学报》英文版》1997,71(4):486-490

Changchengite occurs in chromite orebodies in dunite and in platinum placer deposits in chromite orebodies nearby. The mineral occurs as massive aggregates or veinlets on margins of iridisite (IrS2) and replaces it. Opaque. Lustre metallic. Colour steel-black. Streak black. Hm = 3.7. VHN20= 165 kg/ mm2. Isotropic. Cleavage none. Density 11.96 g/ cm3. Seven electron microprobe analyses give the following mean chemical results (wt. %): S 7.2, Cu 0.3, Te 0.4, Ir 41.2, Pt 2.8 and Bi 47.3 with total 99.1. The simplified formula is IrBiS. The strongest X-ray powder diffraction lines (hkl, d, I) are 210, 2.75 (70); 211, 2.51 (60); 311, 1.860 (100); 440. 1.090 (50) and 600, 1.027 (50). The X-ray powder diffraction pattern is similar to that of mayingite. After the diffraction data are indexed the mineral is determined to be cubic. The space group is P213 with a = 0.6164(4) nm, V = 0.2342 nm3 and Z = 4.  相似文献