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Multiphase tectonic movements, cap formations and evolution of the Majiang paleo-reservoir

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Petroleum Science 2011年第2期8卷 127-133页

作者： Tang Liangjie Cui Min State Key laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China CNOOC Research Institute Beijing 100027 China

The Majiang paleo-reservoir is a typical destroyed hydrocarbon reservoir, buried in carbonate strata of china＇s southern marine-facies. Field geological explorations, interpretations of seismic profiles and balanced cross-section restorations around this paleo-reservoir reveal that its formation and evolution have been restricted by multiphase tectonic movements of different intensities. A regional tectonic mechanism and model have been suggested for the formation and evolution of the Majiang paleo- reservoir. geological field exploration has been carried out along three typical Silurian cross-sections and rock samples were tested in combination with water-rock interaction. Based on the result of cap tests, the planar distribution, the residual thickness, the erosion thickness and the preservation conditions, the Silurian mudstone cap is discussed around the Majiang paleo-reservoir. Combining the hydrodynamic conditions of its formation and evolution and its tectonic movements, we determined the fact that the thicker the cap is, the more resistant it is to hydrodynamic destruction. The multi-phase formation and destructive geological model of the paleo-reservoir is established through an overall analysis of multi- phase tectonic evolutions, cap developments, hydrodynamic conditions and solid mineral metallogenic ages measured by Rb-Sr, Pb and Sm-Nd isotope techniques.

关键词： Multiphase tectonic evolution key tectonic changes cap evolution hydrocarbonpreservation Majiang paleo-reservoir

MINERALIZATION AGES OF GOLD-HYDROTHERMAL DEPOSITS IN NORTHERN ZONE OF EASTERN KUNLUN MOUNTAINS BASED ON FISSION TRACK ANALYSIS

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地学前缘 2000年第S1期7卷 329-330页

作者： Yuan Wanming 1,Wang Shicheng 1,Mo Xuanxue 2,Wang Lanfen 1[WT5,5”BX](1 Institute of High Energy Physics, chinese academy of Sciences, beijing 100080,{3. 2 china University of Geosciences, beijing 100083.{3.)

The age of mineralization in a mining area is a primary factor in various researches related to ore\|forming process. It is that the uncertainty of mineralization ages of gold ore deposits in northern zone of eastern Kunlun Mountains, Qinghai Province, restrains to probe the relationship of the deposits to the regional tectonic evolution. This paper documents the fission track method used to determine the ages of gold ore deposits in eastern Kunlun Mountains and considers the implication for the origin of the *** Kunlun Mountains is the northern part of the Qinghai—Tibet Plateau and is of three deep\|seated fault belts in about EW extension. This work mainly includes three gold ore districts. All of them, in the north of Mid\|Kunlun fault belt, belong to northern part of eastern Kunlun Mountains. The Yanjingou district, with geographical coordinate 96°00’E and 3.°10’N, is located 60 km north of Hongqigou district . Both of them are large, typical tectonoalteration gold deposits and were formed in similar geological setting. Hongshuihe ore district is located 50 km east of Yanjingou district and includes tectonoalteration and magmatic cryptoexplosive gold deposits. Outcroped strata are dominantly Jinshuikou Group metamorphic rocks of Lower Proterozoic erathem. The occurrence area of igneous rocks, especially granitoid, accounts for about 90% in first two districts and become less in Hongshuihe district. The gold deposits occur in NW\|striking fault belts. The Rb\|Sr isochron age and K\|Ar isotopic age of Moyite relevant to the gold mineralization are respectively 228 25Ma and 207 1Ma. Rb\|Sr dating of diorite porphyrite is 209 09Ma. Sericite selected from Yanjingou orebody has 252 9Ma K\|Ar age. The ore in Hongqigou district has 197Ma K\|Ar age and 210Ma model age of Pb isotope of galena.

关键词： mineralization age thermal event fission track thermochron ology fission track analysis eastern Kunlun Mountains

Characteristics of Ore-Forming Fluids of Gold Deposits in Daqingshan District,Inner Mongolia,china

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International Journal of Minerals,Metallurgy and Materials 1999年第2期13卷 77-82页

作者： Jiuhua Xu YulingXie Dayi Qian Rufu Dine Jianping Li (Resource Engineering School, University of Science and Technology Beijha beijing 100083. china) (china University of Geosciences, beijing 100083. china) Resource Engineering School University of Science and Technology Beijing Beijing 100083 China china University of Geosciences Beijing 100083 China

***-weststrikingductileshearzonewithinagreelt,***:(1)pyrite-quartz,(2)quartz-Pyrite,(3.polymetallicsulfidesand(4)***-bearingveinsarenativegold,electrum,pyrite,chalcopyriteandgalena,buttheganguemineralsaremainlyquartz,secondarilysericite,***,silicification,***-formingfluidswerelowinsalinitieandhighinCO2content,MeasuredδDoffluidinclusionsinquartzfromtheoreveinsrangesfrom-65‰to-104‰,butδ18Oquartzfrom10.0‰to12.8‰.Thesedatashowthatthewaterinhydrothermalfluidprecipitatingtheorebodiescouldhavebeenmainlymagmaticwaterandmetamorphicwaterbutlocalmeteoricwatermighttakepartinthelatemineralization.δ13.fromfl

关键词： fluid inclusions isotope composition gold deposit Daqingshan area

Combined chemical separation of Lu,Hf,Rb,Sr,Sm and Nd from a single rock digest and precise and accurate isotope determinations of Lu-Hf,Rb-Sr and Sm-Nd isotope systems using Multi-Collector ICP-MS and TIMS

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Combined chemical separation of Lu,Hf,Rb,Sr,Sm and Nd from a...

中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Yue-heng Yang~(a,b,*),Hong-fu Zhang~a,Zhu-yin Chu~(a,b),Lie-wen Xie~a,Fu-yuan Wu~a a State Key laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,chinese academy of Sciences,{3. 100029,china b laboratory for Radiogenic isotope Geochemistry,Institute of Geology and Geophysics,chinese academy of Sciences,{3. 100029,china

A combined procedure for separating Lu,Hf,Rb,Sr,Sm and Nd from a single sample digestion is presented in this *** procedure consists of the following four steps:(1) sample dissolution in a mixture of concentrated HF-HNO-HClO;(2) Lu and Hf separation from the Rb,Sr,LMREE and other matrix elements by HF-free extraction chromatography;(3. Rb,Sr and LMREE separation from other matrix elements using a cation-exchange resin;(4) Sm and Nd separation from others LMREE by extraction *** feasibility,flexibility and reproducibility of Rb-Sr,Sm-Nd and Lu-Hf isotope systems are demonstrated for international standard solutions and Certified Reference Materials(CRMs). Results show good agreement with previously reported values by isotope dilution methods,indicating the technique has fewer problems in respect to well-known sample inhomogeneity of natural geological materials and demonstrating its potential application to the study of limited and precious terrestrial rocks or minerals(like peridotite,kimberlite and xenoliths) and extra-terrestrial samples(like lunar rock and meteorites).

关键词： Chromatography isotope dilution Lu-Hf Rb-Sr Sm-Nd geological samples MC-ICP-MS TIMS

The Bikou basalts in the northwestern Yangtze block,South china:Remnants of 820-810 Ma continental flood basalts?

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The Bikou basalts in the northwestern Yangtze block,South Ch...

中国科学院地质与地球物理研究所2008学术年会

作者： Xuan-Ce Wang Xian-Hua Li~+ State Key laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,chinese academy of Sciences,P.O.Box 9825, {3. 100029,china Key laboratory of isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,chinese academy of Sciences, Guangzhou 510640,china Wu-Xian Li Key laboratory of isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,chinese academy of Sciences, Guangzhou 510640,china Zheng-Xiang Li Institute for Geoscience Research,Department of Applied Geology,Curtin University of Technology,GPO Box U1987,Perth,WA 6845, Australia Ying Liu Key laboratory of isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,chinese academy of Sciences, Guangzhou 510640,china Yue-Heng Yang State Key laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,chinese academy of Sciences,P.O.Box 9825, {3. 100029,china Xi-Rong Liang Xiang-Lin Tu Key laboratory of isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,chinese academy of Sciences, Guangzhou 510640,china

Mantle plume or superplume activities have often been invoked as a cause for the breakup of the Neoproterozoic supercontinent ***,associated Neoproterozoic continental flood basalts,a requisite product of mantle plume activities,have rarely been *** sensitive high-resolution ion microprobe(shrimp) U-Pb zircon ages,geochemical,and Hf-Nd isotopic data are reported here for the Bikou Group basalts,the largest Neoproterozoic volcanic units in the northwestern Yangtze block, South *** Bikou basalts are mainly tholeiitic in composition,and they can be stratigraphically subdivided into the lower and upper *** U-Pb zircon dating of intercalated rhyolites indicates that the lower and upper group basalts were erupted at 821±7 Ma and 811±12.Ma,respectively. The two basalt groups define two populations on most elemental and isotopic diagrams. The lower group basalts display strong subcontinental lithospheric mantle affinities and large variableεNd(t)) andεHf(t)) values that correlate negatively with Th/Ta and positively with *** upper group basalts,on the other hand,show ocean-island basalt(OIB) affinities and highly positiveεHf(t)) andεNd(t)) values. Numerical modeling indicates that the lower and upper group basalts were formed at melting temperatures of>13.0℃and>1450℃and mantle potential temperatures of 1400- 1488℃and 1550±3.℃,***, the upper group basalts were derived from an anomalously hot asthenosphere mantle,～160℃hotter than the contemporary ambient mid-ocean-ridge basalt(MORB) source *** results are at clear variance with the alternative tectonic model that the Bikou basalts were part of a continental magmatic *** work suggests that the Bikou basalts are likely the remnants of Neoproterozoic continental flood basalts that formed in response to a mantle plume starting ca.825 Ma during the breakup of the supercontinent Rodinia.

关键词： Neoproterozoic continental flood basalts Nd-Hf isotopes Yangtze block South china mantle plume Rodinia

AGE OF THE ALTYN TAGH STRIKE—SLIP FAULT

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地学前缘 2000年第S1期7卷 208-209页

作者： Li Haibing 1, Yang Jingsui 1, Xu Zhiqin 1, Wu Cailai 1, Zhang Jianxin 1, Wan Yushen 1, Shi Rendeng 1, Juhn G. Liou 2,Trevor R. Ireland 2 (1 Institute of Geology, chinese academy of geological Sciences,{3., china 2 Department of

A 100～500m\|wide mylonite zone in the Altun Group of Lower Proterozoic age was discovered along the Altyn Tagh strike\|slip fault. The zone is mainly composed of amphibolitic and granitic mylonites. The planar joints of the rocks strike in NE70 and dip steeply (nearly vertical), coincident with the striking of Altyn Tagh fault zone, and their stretched lineations are nearly horizontal. Shear strains are well developed and show sinistral sheared. The amphibolitic and granitic mylonites are most probably the products of deep\|seated melting caused by sinistral strike\|slip shearing as suggested by the evidence below: (1) The migmatization is intensely developed and spatially controlled by the shear zone, and the rock has a set of NNE perspective foliation which is in accord with the direction of the Altyn Tagh strike\|slip fault zone. (2) The recrystallized hornblende aggregate is distributed in band with obvious nebulous texture, indicating the characteristics of anatexis, and the hornblendes are oriented and form the nearly horizontal stretching lineation; some hornblendes have titanite inclusions, and magmatic long\|columnar zircons are in directional arrangement.(3. The banded felsic material is developed, and the plagioclase is characteristic of high\|temperature plastic deformation and shows sinistral shear stain. (4) In mylonites, all the axis C fabric of quartz shows the feature of sinistral shearing and the majority is generally middle to low temperature fabric, but there also exists high temperature fabric, which suggests that high temperature shearing occur in the early stage of strike\|slip deformation and it is characterized by middle to low temperature shearing at the beginning of anatexis or in the late stage of the deformation. (5) On the XZ plane of mylonite and mylonitized rocks, there exists the consistent sinistral shear stain, which suggests the products of the same strike\|slip *** were separated from three samples of mylonitized gra

关键词： Altyn Tagh fault Tibet plateau shrimp dating mylonite

Petrogenesis of Triassic post-collisional syenite plutons in the Sino-Korean craton:an example from North Korea

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Petrogenesis of Triassic post-collisional syenite plutons in...

中国科学院地质与地球物理研究所2008学术年会

作者： PENG PENG * +§,MINGGUO ZHAI* +,JINGHUI GUO* +,HUAFENG ZHANG(?) & YANBIN ZHANG + * Key laboratory of Mineral Resources,Institute of Geology and Geophysics,chinese academy of Sciences, P.O.Box 9825,{3. 100029,china + State Key laboratory of Lithospheric Evolution,{3. 100029,china (?) State Key laboratory of geological Processes and Mineral Resources,china University of Geosciences, {3. 100083.china

More than ten Triassic syenite plutons are revealed to be distributed in North Korea along the boundary to South *** Tokdal Complex is one of these but is unique in its incorporation of early pyroxenite cumulate in the clinopyroxene/amphibole/biotite/nepheline-bearing syenite main body.A shrimp U-Pb zircon age of 224±4 Ma was obtained from a biotite syenite sample. Clinopyroxene in pyroxenite is zoned,with either phlogopite and apatite inclusion or ilmenite and magnetite exsolution,and may have resulted from crystallization at high pressure in an active continental margin arc environment followed by ascent and *** pyroxenite and syenite are enriched in light REE and LILE,but strongly depleted in HFSE,with Sr/860Sr values of～0.7115 andεNd values of -14 to -20(t = 224 Ma).The Tokdal Complex could have originated from an enriched lithospheric mantle and undergone assimilation of juvenile materials during differentiation. It indicates an extension of post-collisional magmatism in the Sino-Korean *** complex along with many other Triassic plutons in the Sino-Korean craton together constitute three syenite belts along the northern,southern and eastern margins of the craton,possibly resulting in its final configuration in eastern Asia.

关键词： North china North Korea Triassic syenite

The Ashele VMS-type Cu-Zn Deposit in Xinjiang,NW china Formed in a Rifted Arc Setting

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The Ashele VMS-type Cu-Zn Deposit in Xinjiang,NW China Forme...

中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Bo WAN,Lianchang ZHANG and Peng XIANG Key laboratory of Mineral Resources,Institute of Geology and Geophysics,chinese academy of Sciences,{3.,china

The Ashele Cu-Zn deposit is a typical VMS deposit in chinese Altay located in the southern margin of the Altaid *** deposit occurred in the polyphase fold system,and the main orebody is located at the hinge of the *** orebodies show lenticular form,and are stratabound by a suite of early to middle Devonian bimodal volcanic *** hosting basalt is low K tholeiite and characterized with high Mg,Fe,Ca and low K,*** basalts show flat REE pattern with Ce negative anomaly(Ce/Ce 0.73.0.76).Niobium,Ta, Zr,Hf are depleted and Rb,Ba,Th,U,Sr,Pb are enriched with respect to the *** the Sr and Nd isotopes show depleted properties,while the(Sr/Sr) and theε(t)range from 0.70469 to 0.70488 and 4.6 to 5.3.*** geochemical and isotopic data from the hosting basalt show that it originates from an island arc *** also report the S isotope data from the massive orebody,andδS‰change from 1.8‰to 5.6‰.The S isotope data provide evidence that the sulfur originates from a mixing source between magma and seawater *** propose that the mafic magma provides the ore-forming metal and some percentage of sulfur,while it also acts as a heat engine which makes the fluids leach the metal from the underlying volcanic *** the geological characteristics of the Ashele and geochemical data,and comparing with other Cu-Zn VMS deposits in the world,we propose that Ashele formed in *** arc setting.

关键词： Altaid orogen Ashele Cu-Zn VMS deposit island arc

geological AND GEOCHEMICAL FEATURES OF THE PERMIAN SHIYINGTAN LOW SULFIDATION EPITHERMAL GOLD DEPOSIT,EASTERN TIANSHAN,NW china

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GEOLOGICAL AND GEOCHEMICAL FEATURES OF THE PERMIAN SHIYINGTA...

中国科学院地质与地球物理研究所2003.术年会

作者： Lianchang Zhang~1,Jinsheng Ji~2,Xingke Yang~2,Kezhang Qin~1,Cunji Xue~2, and Chengyou Feng~3.1 Institute of Geology and Geophysics,chinese academy of Sciences,beijing,100029,P.R.{3. 2 Geosciences Department of Chang-an University,Yanta Road,Xi’an,710054,P.R.china 3.Institute of Mineral Deposits,chinese academy of geological Sciences,Baiwanzhuang Road, beijing 100037,P.R.china

The Shiyingtan gold deposit,located in a Late Paleozoic volcanic sequence along the northern margin of Tarim plate and western part of Kanggurtag metallogenic belt,was the first low-sulfidation epithermal gold deposit discovered in the eastern part of the Tianshan range,NW *** deposit is closely associated with an arcuate fracture system along the margins of a Permian *** mineralization is hosted in andesite,ignimbrites,and volcanic breccia with magmatic ages of ca.290-270 *** main orebodies,with a combined 200 000 oz Au resource,are composed of a series of steep,interconnected, crustiform-banded quartz veins,which together are as wide as 20 m and extend to depths of>200 *** gangue minerals in the ore-bearing veins consist of quartz,chalcedony,calcite,chlorite,adularia and sericite;metallic minerals mainly include pyrite,chalcopyrite,native gold,and *** temperatures and salinities of primary fluid inclusions in quartz vary from 13. to 250℃and from 0.8 to 6.7 wt%NaCl equiv.,*** and oxygen isotope data indicate that the mineralizing fluid was mainly of meteoric *** geologic and geochemical investigations confirm that the Shiyingtan gold deposit is a Late Paleozoic epithermal gold deposit of the adularia-sericite type.

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