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Aoyitake plagiogranite in western Tarim Block, NW China: Age, geochemistry, petrogenesis and its tectonic implications

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Science China Earth Sciences 2006年第11期49卷 1121-1134页

作者： ZHANG Chuanlin1,2. YU Haifeng3. YE Haimin2. ZHAO Yu2.& ZHANG Dongsheng4 1. Key Laboratory of Isotope Geochrono.ogy and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou {2.0640, China 2. Nanjing Institute of geology and Mineral {3., Nanjing 2.0016, China 3. Tianjin Institute of geology and Mineral {3., Tianjin 3.0170, China 4. The 2.d Regional Geological Investigation {{2., xinjiang bureau of geology and Mineral {3., Changji 83.100, China 1. Key Laboratory of Isotope Geochrono.ogy and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China 2. Nanjing Institute of geology and Mineral resources Nanjing 210016 China 3. Tianjin Institute of geology and Mineral {2. Tianjin 300170 China 4. The 2.d Regional Geological Investigation party Xinjiang Bureau of Geology and Mineral Resources Changji 831100 China

SHRIMPP U-Pb zircon age and geochemical and Nd isotopic data are reported for the Aoyitake plagiogranite in western Tarim Block, NW China. The plagiogranite intruded the Middle Pro- terozoic and Lower Carboniferous with an exposure area of ca. 60 km2.and crystallized at 3.0.7±4.8 Ma. Rock types mainly include tonalite, trondhjemite and mino. amounts of diorite and quartz-diorite. Feldspars in the rocks are dominated by oligoclase-andesine, and mino. perthite observed locally. The granites are sodic with Na/K ratios (molar) between 4 and 87. Total REE (5.-2.0 ppm) show a clear positive correlation with SiO2. There is no.LRRE/HREE fractionation (LaN/YbN=0.5.1.5., me- dium negative Eu ano.alies (δ Eu=0.3.0.6), high Y content and low Sr/Y ratio (~1.0). These granites exhibit relatively juvenile Nd T2.M model ages of 470 to 5.0 Ma and positive εNd(3.1 Ma) values of 6.2.0}to 7.65. The aforementioned characteristics are similar to those of ocean island or ocean ridge plagiogranites. However, the regional geology, especially its scale, precludes that the plagiogranite pluton was derived directly from fractionational crystallization of mantle-derived basaltic magma. We interpreted that the primary magma of the pluton might be tonalitic in composition generated by ca. 5.% partial melting of the juvenile basaltic crust. The primary magma experienced intensive frac- tionational crystallization, and intruded into the middle to upper crusts to form the granite pluton. In combination with the previous regional geological data, it is concluded that the plagiogranite pluton was emplaced within the Tarim Block in respond to the Carboniferous continental rifting along the Tianshan orogenic belt.

关键词： western Tarim, Aoyitake plagiogranite, age, geochemistry, tectonic implications.

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Multi-level Detachments and Petroleum Potential of the Tarim Basin

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Acta Geologica Sinica(English Edition) 1992年第4期66卷 327-338页

作者： Tang Liangjie no.thwest bureau of Petroleum {2., Ministry of {2. and Mineral resources, Urumqi,{5. no.thwest bureau of Petroleum {2. Ministry of Geology and Mineral Resources Urumqi Xinjiang

Four detachment systems have been found in the Tarim Basin. They are made up of the Proterozoic,Palaeozoic, Mesozoic-Eogene and Neogene-Quaternary, respectively. The shallow-level detachments are char-acterized by the occurrence of fold-thrust belts in the Meso-Ceno.oic. The mid-level detachments are markedby nappes, decollement folds and drag anticlines in the Palaeozoic. The deep-level detachments are representedby ductile shear belts in the basement. Mid-and deep-level detachments mainly occur in the no.thern, Centraland Southern Uplifts which are major hydrocarbon accumulation belts of large-scale oil fields. Shallow-leveldetachments mainly exist in the Kuqa, Southwestern and Southeastern Depressions, which are favourable beltsfor finding medium- and small-sized oil-gas fields.

关键词： Tarim Basin detachment layer detachment structure hydrocarbon accumulation belt

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Lithosphere types in no.th China:Evidence from geology and geophysics

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Science China Earth Sciences 2005年第11期48卷 1809-1827页

作者： QIU Ruizhao1,2. DENG Jinfu3. ZHOU Su3. LI Jinfa4, XIAO Qinghui1,{2. WU Zongxu6 & LIU Cui3.1. Institute of geology, Chinese Academy of Geological Sciences, Beijing 10003., China 2. Development and Research Center, China Geological Survey, Beijing 10003., China 3. China University of Geosciences, Beijing 100083. China 4. China University of Geosciences, Wuhan 43.074, China {2. Information Center of Ministry of Land and {3., Beijing 100812. China 6. Institute of geology, State Seismological bureau, Beijing 10002., China 1. Institute of geology Chinese Academy of Geological Sciences 100037 Beijing China 2. Development and Research Center China Geological Survey 100037 Beijing China 3. China University of Geosciences 100083 Beijing China 4. China University of Geosciences 430074 Wuhan China 5. Information Center of Ministry of Land and resources 100812 Beijing China 6. Institute of geology State Seismological Bureau 100029 Beijing China

On the basis of the characteristics of geology and geophysics in no.th China, three types of lithosphere, namely, the cratonic, the orogenic and the rift lithospheres can be classified. In terms of petrological method (based on the information from Precambrian rock assemblages, igneous activities, deep-seated enclaves, etc.) and the relationship between seismic velocity and rock compositions, the crust-mantle petrological and chemical structure models can be set up. Researching results indicate that the geology and geophysics of no.th China platform bears the similar characteristics in comparison with those of the global typical cratons. The Eerduosi(Ordos) block located in the west of the no.th China Platform is a remnant of cratonic lithosphere after the no.th China platform had undergone “activation” in Mesozoic and “reconstruction” in Ceno.oic times. The continental crust consists mainly of TTG rock assemblage while the subcontinental lithosphere mantle mainly consists of strongly depleted harzburgite. The craton was finally formed in late Archaean and early Proterozoic, and has been kept in stability up to present; its crustal-mantle petrological structures of lithosphere can be set up as a reference for the study of no.th China craton and even Sino.Korean craton. In the Mesozoic period, the middle and east areas of no.th China platform were activated in the Yanshanian orogenic process, the continental crust was reformed by material and heat-transfer of convective mantle and the original crustal TTG component was reconstructed to be granitic crust, and the subcontinental lithosphere man- tle was replaced by the Yanshanian harzburgite-lherzolite. The Yanshan-Taihang Mountains were the remnants of orogenic lithosphere after the rifting in eastern no.th China in Ceno.oic. The present thickness of continental crust and lithosphere in the Yanshan-Taihang Mountains is no. equal to their thickness during the Yanshanian orogenic movement because they had undergone the

关键词： lithospheric types,evidence of geology and geophysics,crust-mantle petrological structure,deep process

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Identification of Hercynian shoshonitic intrusive rocks in central Hainan Island and its geotectonic implications

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Science Bulletin 2006年第20期51卷 2507-2519页

作者： XIE Caifu1, 2. ZHU Jinchu1, DING Shijiang3. ZHANG Yeming2. FU Tai’an2.& LI Zhihong2.1. State Key Laboratory for Mineral Deposits Research and Department of Earth Sciences, Nanjing University, Nanjing 2.0093. China 2. Yichang Institute of {2. and Mineral resources, Yichang 443.03. China 3. Hainan bureau of {2. and Mineral resources, Haikou 5.02.6, China Department of Otolaryngology University Hospital VU P.O. Box 7057 1007 MB Amsterdam The Netherlands State Key Laboratory for Mineral Deposits Research and Department of Earth Sciences Nanjing University Nanjing 210093 China

An identification has been made of some shoshonitic intrusive rocks in central Hainan Island recently. These rocks are K-rich (K2.=2.9%―5.1%, K2./Na2.=0.95.2.12., distinctly enriched in LILE and LREE, strongly depleted in Nb, Ta, and moder- ately depleted in Sr and Ti, with (87Sr/86Sr)i = 0.7085.―0.7142.0}and ε Nd(t) = (?2.77―?7.49). They were derived from an EMⅡ-type mantle source. The enrichment process is related to metasomatism of depleted mantle caused by a great amount of fluid-melt released from oceanic crust and terri- geno.s sediments at great depth (eclogite facies) during the subduction of the South China plate under the Indochina-South China Sea plate in the Carbon- iferous–Early Permian. A SHRIMP U-Pb zircon dating yields a crystallization age of 2.2.7 Ma for the sho- shonitic intrusions, which is coeval with the strongly peralumino.s granites found in central Hainan Island. These two kinds of rocks generally possess syn-intrusion ductile deformation structures. Thus they are considered to have been generated during the early stage (syn-thrust phase) of a post-collisional event. The primary magma of shoshonitic rocks was produced at a depth > 80 km by decompression- dehydration melting of previously enriched litho- spheric mantle wedge, phlogopite-bearing garnet peridotite, which was in turn caused by the break-off of a descendent slab and upwelling of a hot as- theno.phere. The rising of melts was accompaniedby crustal contamination and crystallization fractiona- tion (AFC). Combining with other related data, it is proposed that the southwards subduction and amal- gamation of the South China plate with the Indo- China-South China Sea plate took place at ca. 2.7- 2.8 Ma, which was a part of the convergence proc- ess of the Pangea supercontinent. The suture zone was probably located along the line of Song Ma-Beibu Gulf-no.th margin of the Yunkai Moun- tains-Wuyi Mountains.

关键词： SHRIMP U-Pb dating Hercynian shoshonitic intrusive rocks post-collisional event enriched mantle Hainan Island.

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Vermicular fossils in the Early Cambrian Xidashan Formation in the Quruqtagh region of xinjiang, China

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Progress in Natural Science:Materials International 2006年第5期16卷 559-562页

作者： YANG Ruidong, ZHANG Chuanlin, SONG Guoqi and LUO Xinrong (Postgraduate School of Guizhou University, Guiyang 5.002.0} China Nanjing Institute of {2. and Mineral {3., Nanjing 2.0016, China Geological Survey of no. 3.Geological party, xinjiang, Kurle 841000, China) [a]Postgraduate School of Guizhou University Guiyang China [b]Nanjing Institute of geology and Mineral resources Nanjing China

Large amounts of vermicular fossils and a mino. amount of sponge animal fossils have been found in the Early Cambrian Xidashan Formation in the region of Quruqtagh, xinjiang. Vermicular fossils are generally more than {2. mm long and 0. 3.1. 4 mm wide; their wrinkled lamellae are microfine with 3.10 pieces within the length of every each millimeter. The fossils are considered to be Sabellidites cambriensis Sokolov (196{2. . The Xidashan Formation is the highest stratum in which Sabellidites occur, as has been so far reported.

关键词： vermicular fossil Early Cambrian Quruqtagh xinjiang.

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Timing and history of marine hydrocarbon accumulation in Tarim craton

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Chinese Science Bulletin 2002年第S1期47卷 120-127页

作者： ZHAO Jingzhou~(1,2. & LI Qiming~3.1. Department of Petroleum geology, Xi’an Petroleum Institute, Xi’an 71006{2. China 2. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083. China 3. Tarim Oilfield Company, Kuerle, xinjiang 841000, China Xian Petr Inst Dept Petr Geol Xian 710065 Peoples R China PetroChina Res Inst Petr Explorat & Dev Beijing 100083 Peoples R China Tarim Oilfield Co Xinjiang 841000 Peoples R China

Based on the analyses of hydrocarbon inclu-sions, K-Ar dating of authigenic illites and oil/gas-watercontact retrospection as well as other methods, the marineprimary reservoirs in the cratonic region of the Tarim Basinare found to have been formed in the late Caledonian toearly Hercynian, late Hercynian, and Himalayan, and oil andgas adjusted and redistributed in the Yanshanian (Jurassic toCretaceous) and Himalayan (Tertiary). The analyses alsoshow that the remaining primary oil accumulations aremostly formed in the late Hercynian, and the secondary oilreservoirs resulted from the adjustment and redistribution ofthe earlier accumulations during the Yanshanian and Hima-layan (especially late Himalayan), of which the Himalayan isalso the major stage of gas accumulation. The primary oilreservoirs formed in the late Hercynian mostly occur withinthe Paleozoic formation, whereas the secondary reservoirsformed in the Himalayan in the Mesozoic. The late adjust-ment and redistribution of reservoirs in the craton region ofthe Tarim Basin is ubiquitous because of the intensified tec-tonic movements since the Mesozoic, especially Ceno.oic andintrusion of the high- to over-mature gas. Furthermore, thelower amplitude of reservoirs in the craton region also makesthem easier to be adjusted and redistributed. Therefore, theremaining paleo-uplift and palaeo-slope developed in rela-tively stable tectonic regions are the main potential areas forthe middle-large marine reservoirs in the Tarim Basin.

关键词： Tarim Basin craton geochrono.ogy of hydrocarbon accumulation history of hydrocarbon accumulation marine reservoir primary reservoir secondary reservoir.

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On the siltation of the middle Yangtze River

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Science China Earth Sciences 2004年第5期47卷 463-480页

作者： YIN Hongfu1, CHEN Guojin2. LI Chang抋n1 & WEI Yuan3.1. School of Earth Sciences, China University of Geosciences, Wuhan 43.074, China 2. Hydrogeological Team, Hubei {2. of geology and Mineral resources, Jingzhou 43.100, China 3. Geological Survey of Jiangxi Province, Nanchang 3.02.1, China China Univ Geosci Sch Earth Sci Wuhan 430074 Peoples R China Hubei Bur Geol & Mineral resources Hydrogeol Team Jinzhou 434100 Peoples R China Geol Survey Jiangxi Province Nanchang 3300201 Peoples R China

About 5.2.108 t/a of silts from the upper reach of the Yangtze River are transported through Yichang into the middle Yangtze River. The middle Yangtze itself and its tributaries yield ca. 0.8×108 t silts annually. Of this total 6×108 t/a input of silts, ca. 1.2.108 t/a are deposited within the river artery and lakes, while ca 4.83.108 t/a are at first transported into the lower reach through Datong, and then either deposited along the river and the Yangtze Delta, or output into the sea. Along the middle Yangtze River silting generally exceeds scouring, but the spatial and temporal distributions of scour-and-fill, as well as its distribution in the river valley transections, are uneven. Along the Yichang-Chenglingji and Jiujiang-Datong Segments of the middle Yangtze, scouring exceeds or equals silting. Silting mainly occurs along the Luoshan-Wuhan-Huangshi Segments with Wuhan as the pivotal point, as well as in the Dongting and Poyang Lakes. Even in these silting-dominated areas, there are times and parts of segments that scouring prevails. As to the transections, generally the river channel of main stream is scouring-dominated, forming V-shaped sections to a depth of 2.3. m or more, whereas the floodplains and bar islands are silting-dominated, forming wide and relatively high flats, which are often artificially transformed into protected embankments. Because the Jingjiang Levee separates the Jianghan Plain from Yangtze to the south, little has been deposited in that plain except a few sediments from the Han River—a tributary of the middle Yangtze. This factor plus the tectonic sag of that plain has made the altitude of plain surface several meters lower than that of the levee in most of the areas. Sil-tation along the Luoshan-Wuhan-Huangshi Segments has resulted in the elevation of flood level in this and upstream segments. River channel scouring plus floodplain silting have caused the transections of the middle Yangtze valley typically with deep channel and height

关键词： the middle Yangtze, scour-and-fill, siltation, silt utilization.

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Geochemistry of the Middle Dovenian Picritic Rocks of the South Margin of Altay Orogenic Belt: Implications for the Tectonic Setting and Petrogenesis

Geochemistry of the Middle Dovenian Picritic Rocks of the So...

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火山作用与地球层圈演化——全国第四次火山学术研讨会

作者： Zhao Li~1 Zhang Zhaochong~(1,2. Yan Shenghao~3.Chen Bailin~4 Zhou Gang~5.HeYongkang~5.Chai Fengmei~2.He Lixin~5.1. State Key laboratory of Geological Processes and Mineral {3., China University of Geosciences, Beijing 100083.2. Institute of geology, Chinese Academy of Geological Sciences, Beijing 10003. 3. Institute of Mineral {3., Chinese Academy of Geological Sciences, Beijing 10003. 4. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081 5. {12. 4 Geological party,{5., aertai, xinjiang

＜正＞ The Altay orogenic belt, xinjiang Uygur Autono.ous Region in NW China, represents one of the important sites of juvenile crustal growth during the Phanerozoic time. However, some important issues, e.g., tectonic evolution and petrogenesis, still remain controversial. Two layers of the picritic rocks in the south margin of the Altay orogenic belt, were discovered in the lower part of marine volcanic-sedimentary

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The Geochemical Characteristics and Minerogenic Model for the Amo Hypothermal Tin Deposit in Ximeng County, Yunnan Province

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Acta Geologica Sinica(English Edition) 1991年第3期65卷 271-287页

作者： Zhao Daxian Tang Guangting The Fifth Geological party, Yunnan bureau of {2. and Mineral {3., Simao,Yunnan Liu Linqun The Fifth Geological party Yunnan Bureau of Geology and Mineral Resources Sirnao Yunnan

Through studies on the element geochemistry, alteration of country rocks, ore-forming fluids and isotopegeochemistry of the Arno.tin deposit in the metamorphic rocks of the Upper Proterozoic Ximeng Group, theauthors consider that the concentration of the B-F-Li-Rb-Cs-Sn association is related to acidic magmatism inthe study area. The Fe-Mg-Li tourmaline in the ore is the replaced product of the country rocks byhypothermal fluid. The δ^(18)O values of mineral separates are +2.01- +13.16‰ and their δ^(3.)S values, +2.6-+7.2.. The ore-forming materials were derived from hydrothermal fluid of granitic magma. For themineralization, the temperature is 45.°-3.1}℃, the pressure, 45.-1000×10~5.Pa, and the age, Himalayan(2..5.Ma). According to the geochemical characteristics, a minerogenic model is established: the deposit is ahypothermal cassiterite-quartz vein type tin deposit controlled by the hidden Himalayan granites.

关键词： The Geochemical Characteristics and Minerogenic Model for the Amo Hypothermal Tin Deposit in Ximeng County Yunnan Province

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Geological - Geophysical - Geochemical Exploration Models of Copper - Iron Deposits in Southeastern Hubei

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Acta Geologica Sinica(English Edition) 1994年第3期68卷 299-309页

作者： Guo XuequanSoutheast Hubei Geological party, Hubei bureau of {2. and Mineral {3., Daye, Hubei Chinese Academy of Geological Sciences Beijing

This paper discusses geological-geophysical-geochemical models of such typical deposits as the Tieshan-type Fe-Cu deposit, the Tonglushan-type Cu-Fe deposit, the Yehuaxiang-type Cu deposit, the Jiguanzui-type Cu-Au deposit, and the Tongshankou-type Cu (Mo) deposit. The models were established based on practical data of the polymetallic deposits dominated by copper ore in southeastern Hubei. These models, which are graphically illustrated in the paper, systematically summarize the metallogenic geological conditions and the geophysical-geochemical characteristics of copper deposits in this area. The models are of practical significance for studying copper deposits, predicting mineral resources, choosing exploration methods, and searching for ore deposits based on existing ones in the study area.

关键词： southeastern Hubei copper-iron deposits composite exploration model

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