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Microstructures of co-axially folded vein segments and crenulation cleavage： Evidence for dissolution phenomena in the Chamba Thrust Sheet, western Himalayas

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Episodes 2004年第2期27卷 119-124页

作者： B.K.Sharma A.M.Bhola DepartmentofGeology UniversityofDelhiDelhi-110007India.

The metasediments in the Chamba region experienced three phases of deformation: DF1, DF2 and DF3.Folded quartz veins are co-folded with the F2 crenulation folds. Their geometric and tectonic significance is studied by microstructures and shortening adjacent to the discrete crenulation cleavage, S2. Microstructures of folded vein segments, their geometric changes and truncation to cleavage (S2) are mainly due to pressure-solution phenomena and the estimated volume loss from reconstructed vein segments range from 16 to 25.5%,which is closely related to volume decrease (26%) calculated from the polydeformed slates of North Wales areas.

关键词：显微结构变质沉积物地质学石英纹理

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Geological structure, composition of ores and age of the Bamsk gold deposit, Amur region, Russia

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Journal of Geoscientific Research in Northeast Asia 2004年第2期7卷 173-180页

作者： Vitaly A. Stepanov Amur Research Integrated Institute FEB RAS Blagoveschensk 675000 Russia

The Bamsk gold-ore deposit is located in the Amur region, the Far East of Russia. It is confined to the Early Cretaceous volcanic-plutonic uplift of central type, located in the Stanov folded-clumpy Pre-Cambrian system. The deposit is presented by a series of gold-bearing quartz and carbonate-quartz vein-stringer zones. They are confined to the super-intrusive zone of the Nevachansk subvolcanic intrusion of sienite-porphyric composition. The mineralization is being controlled by zone of fractures developed in the autochthone of the Bamsk fault. Quartz, carbonates and sericite prevail in the composition of ores. The quantity of ore minerals doesn’t exceed 1%～5%. Pyrite, chalcopyrite, galena and native gold are widely spread. Sheelite, gold and silver tellurides, sulphobismuthites, acanthite, sphalerite and cinnabar are less developed. Four stages of mineralization have been distinguished. Gold-sulphide-sulphosalt ore with tellurides of gold and silver is productive for gold. The following set of elements is typomorphic for the ores of the deposit: Au, Ag, Cu, Bi, Mo, Pb and Sb(W1, Pb1, Mo)-Cu-(Ag, Bi, Sb, Mn, W2, Pb2)form the vertical series of zoning. Rocks, enclosing the mineralization are exposed to the processes of listvenitization-beresitization. The processes of gumbeization and argillization are less manifested. The age of the gold mineralization, determined by Rb-Sr method on ore-accompanying minerals, is 130.6 Ma.

关键词： Bamsk 金沉积矿地质断层俄罗斯石英纹理

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Characters of fluid inclusions in quartz veins in pyroclastic rock of Budate Group, Hailar Basin

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Journal of Geoscientific Research in Northeast Asia 2004年第2期7卷 161-164页

作者： ZHANGXin-tao LIULi GAOYu-qiao SHAOHong-mei SHENGuang-zheng CollegeofEarthSciences JilinUniversity.Changchun130061JilinChina ExploratinandDevelopmentResearchInstituteofDaqingOilfieldLimitedCo. Daqing163712HeilongjiangChina

It was adopted that the fluorescence microscope, Gas-Flow Heating/Freezing System, Laser-Raman Spect-roscopy, etc. are the multimedia techniques for analysing fluid inclusions of quartz veins in Budate Group, Hailar Basin. The results show that fluid inclusions in quartz veins are small(1～5 μm)monophase, two-phase(liquid+vapour)aqueous inclusions; the two-phase aqueous inclusions homogeniese to the liquid phase between 120～180℃, two dominant types for oil inclusions were determined in quartz veins:① the primary inclusions, almostly gas, measurement by Laser-Raman Spectroscopy show that both gas phase are enriched in CH4(94.50%～99.25%)and C6H6(0.75%～2.70%), under these conditions, inclusions may have come from juvenile fliud followingly the quartz veins formation. While the quartz veins exhibiting different striking luminescence has been proved by cathodoluminescence, it would be impossible to come from the deep magmas and strata. ② aqueous, liquid and two-phase(liquid+vapour)oil inclusions, belong to secondary hydrocarbon inclusions. The oil inclusions of this stage represent mainly the large scale of oil accumulation, located within the quartz microfracture.

关键词：石英纹理同化温度拉曼激光光谱学阳极荧光

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