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late paleozoic reefs and their significance for tectonics and oil-gas exploration in the Hinggan-Inner Mongolia area

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Science China Earth Sciences 2011年第2期54卷 212-222页

作者： TIAN ShuGang ZHANG YongSheng WANG JunTao NIU ShaoWu Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China Tianjin Institute of Geology and Mineral Resources China Geological Survey Tianjin 300170 China

Many reefs of the late paleozoic have been discovered recently in the Hinggan-lnner Mongolia area. These reefs clearly are geographically extensive, and possess distinctive features and well-developed reef-facies. They have been found to contain five reef-building communities and were constructed in four periods. Colonial coral-algal reefs at Aohan and Chifeng represent a warm shallow-sea in the Carboniferous. Different reefs in the Xiwu Banner were formed in three periods： early late Carboniferous, late late Carboniferous and Early Permian. These reefs were built in warm sea conditions. Their buildup types include colonial coral frameworks, algae-buildings and lime-mud mounds. Bryozoan reefs in the Zhalaite and Dongwu banners were built in the late Middle Permian and thrived in a cold shallow-sea. All reefs grew independently on two kinds of sedimentary platforms, carbonate and carbonate-clastic mixed platforms. Four reef-forming periods occurred later from south to north, along a collisional course between the North China Plate and the Siberian Plate. These reefs can be arranged into three ＇reef-links＇ or reef zones that extend along plate margins. Among these, the Aohan-Chifeng reef-link indicates a northern margin of the North China Plate, the Zhalaite-Dongwu reef-link marks a southern margin of the Siberian Plate, and the Xiwu-Beishan reef-link reflects the former existence of some inter-plates. The strata of each reef-facies are thick and contain rich asphalt deposits. Overlapping and heteropic layers are very thick and contain dark oil/gas-rich horizons; TOC analyses verify that most of these are good hydrocarbon source rocks. This study shows that the study area is an excellent candidate for oil-gas exploration.

关键词： reefs late paleozoic Hinggan-Inner Mongolia fold-zone oil-gas exploration

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late paleozoic Fluid Systems and Their Ore-forming Effects in the Yuebei Basin,Northern Guangdong,China

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Acta Geologica Sinica(English Edition) 2005年第5期79卷 673-687页

作者： DENG Jun YANG Liqiang SUN Zhongshi WANG Jianping WANG Qingfei CHENG Xueming ZHOU Yinghua State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of the Ministry of Education China University of Geosciences Beijing 100083 School of Earth Sciences Jilin University Chuangchun Jilin 130061

Based on detailed and systematic researches of the geology of ore deposits, fluid inclusions and isotope geochemistry etc., and regarding the late paleozoic fluid system of the Yuebei Basin as an integrated object in this paper, we have revealed the temporo-spatial evolution law of the basin＇s fluid system and discussed its ore-forming effects by simulating and analyzing the distribution of ore-forming elements, the fluid thermodynamics and dynamics of evolution processes of this basin. The results show that late paleozoic ore-forming fluid systems of the Yuebei Basin include four basic types as follows. （1） The sea floor volcanic-exhalation system developed during the rapid basin slip-extension stage in the Mid-late Devonian, which affected the Dabaoshan region. It thus formed the Dabaoshan-type Cu-Pb-Zn-Fe sea floor volcanic-exhalation sedimentary deposits. （2） The compaction fluid system developed during the stable spreading and thermal subsidence-compression stage of the basin in the Mid-late Devonian. The range of its effects extended all over the whole basin. It resulted in filling-metasomatic deposits, such as the Hongyan-type pyrite deposits and pyrite sheet within the Fankou-type Cu-Pb-Zn-S deposits. （3） The hot water circulation system of sea floor developed during the stage of basin uplifting and micro-aulacogen from the late late Carboniferous to Middle Carboniferous. The range of its effects covered the Fankou region. It thus formed MVT deposits, such as the main orebody of the Fankou-type Pb-Zn-S deposits. （4） The gravity fluid system developed during the stage of fold uplifting and the basin closed from Middle Triassic to Jurassic, forming groundwater hydrothermal deposits, e.g. the veinlet Pb-Zn-calcite orebodies of the Fankou-type Pb-Zn- S deposits. Migration and concentration of the ore-forming fluids were constrained by the state of temporo-spatial distribution of its fluid potential. Growth faults not only converged the fluids and drove them to m

关键词： fluid system stratabound deposit late paleozoic Yuebei Basin Guangdong

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A Reconstruction for the late paleozoic Tectonic Evolution of the Tekes Daban Area,Western Tianshan Mountains:Evidence from Unconformities

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Acta Geologica Sinica(English Edition) 2011年第5期85卷 1127-1133+1135-1136+1134页

作者： LI Yongjun~(1,*),YANG Gaoxue~1,WANG Xiaogang~2,ZHANG Tianji~1,LIU Xiaoyu~1, YANG Mingyi~1 and TONG Liming~2 1 School of Earth Sciences and Resources Management,Chang’an University,Xi’an 710054,China 2 No.9 Geological Brigade,Xinjiang Bureau of Geology and Mineral Exploration and Development,(U|¨)rmqi 830000,China School of Earth Sciences and Resources Management Chang'an University Xi'an 710054 China No. 9 Geological Brigade Xinjiang Bureau of Geology and Mineral Exploration and Development ürümqi 830000 China *Correspondence: Yongjun LI *Correspondence: Corresponding author. E-mail: yongjunl@***

The identification of unconformities is the key to reconstructing tectonic evolution,revealing crust movement and establishing tectonic *** a long time,there were some controversial issues on the episodes of Variscan cycle(especially on the period of Carboniferous-Permian stages) of the Tianshan *** essential questions fall on the numbers and property of unconformities in this area, for example,in the western Tianshan *** research only recognized three or four fold *** regional geological mapping of 1:50000 in the Tekes Daban area,western Tianshan have allowed us to characterize the seven unconformities within the Carboniferous-Permian strata and understand its implications for tectonic reconstruction of the Tianshan *** angular unconformities,which indicate that seven tectonic episodes occurred in the late paleozoic Period,were identified in this ***,the newly discovered unconformities based on the angle-unconformity between the Dongtujinhe and Keguqinshan Formations,and angle-unconformity between the Wulansayi and Wulang Formations,respectively indicates the Tekes episode and Gongliu *** unconformity between the Dongtujinhe and Yishijilike Formations is angle-unconformity instead of parallel unconformity indentified by previous research,so the former Bogda ascending can be revised as Bogda ***,these newly identified seven episodes,including the Tekes episode,suggest that there are seven tectonic movements in the Tianshan area at *** has significant implications for reconstruction of the late paleozoic tectonics in the Tianshan Area,NW China.

关键词： unconformity episode late paleozoic Western Tianshan Mountains

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Reconstruction of the thermal evolution since the late paleozoic in the Ounan Sag, Eastern Qaidam Basin, NW China: New constraints from vitrinite reflectance data and(U-Th)/He thermochronology

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Petroleum Science 2024年第5期21卷 2984-3000页

作者： Chang Zhong Hui Shi Xiao-Yin Tang Hao Zhang Yuan-Yuan Yang Jun-Jie Hu Xiao-Jie Wei Jia-Qi Wang Institute of Geomechanics Chinese Academy of Geological SciencesBeijing100081China Key Laboratory of Paleomagnetism and Tectonic Reconstruction Ministry of Natural ResourcesBeijing100081China Key Laboratory of Petroleum Geomechanics China Geological SurveyBeijing100081China SinoProbe Center Chinese Academy of Geological SciencesBeijing100037China

Reconstructing the thermal evolution of the eastern Qaidam Basin is important for gaining a deeper understanding of its lithospheric geodynamics and for more accurate hydrocarbon evaluation and prediction. This article presents a set of new apatite and zircon(U-Th)/He thermochronological *** with 336 vitrinite reflectance(R_(o)) data, the thermal history of the Ouanan Sag in the eastern Qaidam Basin has been reconstructed using inversion models. Three detrital samples from the Ounan Sag shows that the apatite(U-Th)/He ages are primarily concentrated in the range of 17.0 Ma to 76.5 Ma and that the zircon(U-Th)/He ages range from 200 Ma to 289.3 Ma. The time-temperature models demonstrate that the Ounan Sag experienced rapid subsidence and heating from the Carboniferous to late Permian, and exhumation/cooling events from the end of Permian to the Triassic. This thermal evolution was influenced by the widespread intrusion of plutons, and the collision and orogenesis caused by asthenosphere upwelling below the Qaidam arc, and slab rollback of the Southern Kunlun oceanic lithosphere, respectively. Additionally, our models depict the main exhumation/cooling stages since the Paleogene and a reheating event in the Miocene as a result of the intensifying growth of the Qinghai-Tibet Plateau and local sedimentary loading, followed by the initial India-Eurasia collision. Furthermore, the eastern Qaidam Basin experienced consistent heating during the late paleozoic, reaching the maximum paleotemperature and geothermal gradient in the late Permian, with values of ~230℃ and~43-44℃/km, respectively. This study suggests that the source rocks in the most upper member of upper Carboniferous Keluke(C_(2)k) Formations in the Ounan Sag reached the gas generation stage in the late Permian.

关键词： Thermal evolution Eastern Qaidam Basin late paleozoic Apatite and zircon(U-Th)/He thermochronology Vitrinite reflectance

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Paleomagnetic results of late paleozoic rocks from northern Qiangtang Block in Qinghai-Tibet Plateau, China

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Science China Earth Sciences 2012年第1期55卷 67-75页

作者： CHENG Xin WU HanNing GUO Qiang HOU BaoNing XIA LingYan WANG HaiJun DIAO ZongBao HUO FeiFei JI WenHua LI RongShe CHEN ShouJian ZHAO ZhenMing LIU XiaoJi Department of Geology&State Key Laboratory of Continental Dynamics Northwest UniversityXi'an 710069China Xi'an Institute of Geology and Mineral Resource China Geological SurveyXi'an 710054China

Tectonic evolution of the Tethys and the boundary between the Gondwanaland and the Eurasia during the Carboniferous and Permian remain hotly debated. Qiangtang region in the Qinghai-Tibet Plateau may be a key place to study these problems. A paleomagnetic study was conducted on the late paleozoic rocks in the northern Qiangtang region （33.7°N, 86.7°W）, Tibet. Two sites （21 samples） in the Upper Carboniferous, eleven sites （101 samples） in the Permian, and two sites （16 samples） in the Lower Triassic were investigated. The rock magnetic data revealed hematite and magnetite as the main magnetic carders. In stepwise thermal demagnetization and/or combined alternating field （AC） demagnetization, two characteristic components in the majority of the samples were identified as （1） the Low-temperature Component （LTC）, characterized by northerly decli- nation and moderate to steep inclination, corresponding to a pole position overlay with the present North Pole. A minority of the samples present single component, and their directions are the same as （2） the High-temperature Component （HTC） of double components. The combined single-component and HTC data of the Permian can pass the R-test at 95% level and the F-test at 99% level, as well as the BC-test. The pole position from the late Carboniferous is at 31.8°S, 45.7°E with dp=2.1, dm=3.9, that from the Early and Middle （late） Permian is at 31.7°S, 46.8°E with @=9.2, dm=16.9 （34.4°N, 54.1°E with dp=6.9, dm=1 2.5） respectively, and that from the Early Triassic is at 16.9°S, 22.5°E with dp=4.9, dm=9.2. These pole positions are different from the other poles for the Qiangtang Block, which suggests the single-component and HTC directions are probably a primary magnetization and the northern Qiangtang Block was paleogeographically situated at low latitudes in the Northern Hemisphere in the late paleozoic.

关键词： paleomagnetism Tethys Northern Qiangtang Block late paleozoic

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Detrital zircon constraints on late paleozoic tectonism of the Bogda region(NW China)in the southern Central Asian Orogenic Belt

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Geoscience Frontiers 2020年第5期11卷 1533-1548页

作者： Qian Wang Guochun Zhao Yigui Han Jinlong Yao State Key Laboratory of Continental Dynamics Department of GeologyNorthwest University229 Northern Taibai RoadXi’an 710069China Department of Earth Sciences The University of Hong KongPokfulam RoadHong KongChina

The Chinese North Tianshan(CNTS)in the southern part of the Central Asian Orogenic Belt(CAOB)has undergone multistage accretion-collision processes during paleozoic time,which remain *** study addresses this issue by tracing the provenance of late paleozoic sedimentary successions from the Bogda Mountain in the eastern CNTS through U-Pb dating and Lu-Hf isotopic analyses of detrital *** detrital zircon U-Pb ages(N=519)from seven samples range from 261±4 Ma to 2827±32 *** most prominent age peak is at 313 Ma and subordinate ages vary from 441 Ma to 601 Ma,with some Precambrian detrital zircon ages(~7%)lasting from 694 Ma to 1024 *** youngest age components in each sample yielded weighted mean ages ranging from 272±9 Ma to 288±5 Ma,representing the maximum depositional *** and literature data indicate that some previously-assumed"Carboniferous"strata in the Bogda area were deposited in the Early Permian,including the Qijiaojing,Julideneng,Shaleisaierke,Yangbulake,Shamaershayi,Liushugou,Qijiagou,and Aoertu *** low maturity of the sandstones,zircon morphology and provenance analyses indicate a proximal sedimentation probably sourced from the East Junggar Arc and the Harlik-Dananhu Arc in the *** minor Precambrian detrital zircons are interpreted as recycled materials from the older strata in the Harlik-Dananhu *** EHf(t)values have increased since^408 Ma,probably reflecting a tectonic transition from regional compression to *** event might correspond to the opening of the Bogda intraarc/back arc rift basin,possibly resulting from a slab rollback during the northward subduction of the North Tianshan Ocean.A decrease of zirconεHf(t)values at^300 Ma was likely caused by the cessation of oceanic subduction and subsequent collision,which implies that the North Tianshan Ocean closed at the end of the late Carboniferous.

关键词： North Tianshan Detrital zircon Sedimentary provenance late paleozoic Central Asian orogenic belt

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Tectonic Framework of late paleozoic Intrusions in Xingxingxia： Implications for Final Closure of South Tianshan Ocean in East Tianshan

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Acta Geologica Sinica(English Edition) 2016年第2期90卷 604-627页

作者： ZHOU Hai CHEN Liang SUN Yong ZHU Tao State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069ShaanxiChina Xi'an Center of China Geological Survey Xi'an 710054ShaanxiChina

This work carried out systematic geological field investigation, petrography observation, zircon geochronology and whole rock geochemistry on late paleozoic intrusions in the Xingxingxia region near the Xinjiang-Gansu provincial boundary, western China, aiming to constrain the late paleozoic tectonic framework of the Xingxingxia region and the final closure time of South Tianshan Ocean in the East Tianshan. The Xingxingxia area is located in the east part of the Tianshan orogen, and adjacent to the north of the Tarim Basin. The late paleozoic magma activities in the Xingxingxia region can be mainly divided into three stages. The first stage includes intrusive magma activities under a collision setting between late Ordovician to the late Devonian. The second stage is intrusive magma activities under a subduction setting during（304±3）–（278±3） Ma, and the third stage involves intrusive magma activities under a collision and post-collision setting during（268±5）–（259.9±2.6） Ma. The final suture zone of South Tianshan Ocean should be between the Central Tianshan Block and South Tianshan accretionary complex. Based on previous work, both the first stage magma activities（i.e., intrusive magmatic activities between the late Ordovician to late Devonian） and the Hongliuhe ophiolitic complex indicate a close event between Central Tianshan Block and South Tianshan Accretionary Complex. The 304±3 Ma dioritic metamorphic gneiss of the XingX ingxia complex and the 278±3 Ma diorite are all island arc calc-alkaline rocks, the 289±3 Ma gabbro is island arc tholeiitic gabbro formed by magma from metasomatic enrichment mantle. All these results indicate that the second stage of magmatic activities is under a subduction setting. The third stage magma activities i.e. the granitic magma activities of（268±5）–（259.9±2.6） Ma occurred at a transitional setting from compressional to post-collision extensional tectonic setting. Thus, around（268±5）–（260±3） Ma, the final closure of the South Tians

关键词： Central Tianshan Block Xingxingxia region late paleozoic closure of South Tianshan Ocean

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Comprehensive constraint on the tectono-sedimentary setting of late paleozoic turbidites of the Kamuste area, eastern Junggar,Xinjiang

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Science China Earth Sciences 2001年第12期44卷 1065-1078页

作者：张晓晖李铁胜张福勤 1. Research Center of Mineral Resources Exploration Institute of Geology and Geophysics Chinese Academy of Sciences 100101 Beijing China

Petrography and geochemistry, combined with sedimentation analyses allow for a thorough evaluation of the tectono-sedimentary setting of late paleozoic turbidites of the Kamuste area eastern Junggar. Sandstones of the Alabiye1) Formation are composed mostly of volcanic and sedimentary detritus with lesser amounts of plagioclase and quartz. They were derived from an undissected magmatic-arc provenance. The geochemistry of sandstone-mudrock suites indicates a fesic-intermediate igneous provenance, and constrains the Alabiye Formation to have derived from a differentiated oceanic-continental margin island-arc tectonic setting. Likewise, geochemistry and sandstone petrography of the Kamuste Formation reflect a mixed provenance signature dominated by magmatic arc, basement uplift, and subduction-complex sources of a differentiated continental-island arc. Sedimentation analysis indicates that the Alabiye and Kamuste formations are two sets of turbidite sequences deposited on a submarine slope and a submarine fan and basin plain respectively. In conclusion, submarine slope turbidite deposition of the Alabiye Formation records the main sedimentary response to the development of early Devonian back-arc basins of the northern Junggar tectonic belt. Submarine fan and basin plain turbidite and background hemipelagic deposition of the Kamuste Formation record the main sedimentary response to the late Early Carboniferous development of an inter-arc relict ocean basin of the eastern Junggar composite terrane.

关键词： turbidite provenance sedimentation tectono-sedimentary setting late paleozoic eastern Junggar

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Correction of two Upper paleozoic stratigraphic units in the Tianshan Mountains region, Xinjiang Uygur Autonomous Region and implications on the late paleozoic evolution of Tianshan tectonic complex, Northwest China

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Journal of Palaeogeography 2015年第4期4卷 359-372页

作者： Zhong-Qiang Chen Zhuo-Ting Liao Lu-Jun Liu State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences (Wuhan) Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences

The present paper addresses two tectonostratigraphic concerns on the late paleozoic Tianshan tectonic complex（TTC）, Xinjiang, Northwest（NW） China：（1） stratigraphic succession and age constraint of the Bayingou ophiolite mélange, eastern Tianshan Mountains and（2） timing of closure of the southern Tianshan ocean and accretion of the Siberian craton recorded in the Aiweiergou（AWEG） area, eastern Tianshan Mountains by integrating stratigraphy, palaeontology, tectonopalaeogeography and palaeobiogeography. In the Bayingou area, the detailed palaeontological survey denies the presence of brachiopod Gigantoproductus fauna, typical of the Early Carboniferous faunas in central-south Tianshan complex, in the Anjihai Formation. In contrast, the Anjihai brachiopod assemblage, as a whole, appears to have a high affinity with the late Devonian faunas of the eastern Junggar Basin, northern Xinjiang, suggesting a late Devonian age for the Anjihai Formation. The overlying Shadawang Formation yields the Early Carboniferous radiolarians. These two units form the main part of the Bayingou ophiolite mélange, which therefore is likely late Devonian to Early Carboniferous in age. The Bayingouarea has been likely part of the northern Tianshan-Junggar block since the late Devonian, although it may have been part of the Central Tianshan tectonostratigraphic province prior to the late Devonian. The topmost strata of the Bayingou ophiolite mélange are characterized by alternation of volcanics, conglomerate and mudstone, and are better re-assigned to the Taoxigou Group rather than the Keguqingshan Formation. The Bayingou ophiolite mélange comprises the late Devonian Anjihai Formation, the Carboniferous Bayingou and Shadawang Formations, and the Early Permian Taoxigou Group. In the AWEG area, the Permian and Triassic rocks were previously misinterpreted as the late Permian turbidites and late Triassic red beds, respectively. In fact, the Permian successions in AWEG consist of the Early Permian Ta

关键词： ophiolitic mélange late paleozoic Tianshan tectonic complex Xinjiang Northwest China

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Lithospheric dripping in a soft collision zone:Insights from late paleozoic magmatism suites of the eastern Central Asian Orogenic Belt

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Geoscience Frontiers 2023年第1期14卷 101-117页

作者： Zheng Ji Wen-Chun Ge M.Santosh Chuan-Biao Wan Yan-Long Zhang Jun-Hui Bi Hao Yang Yu Dong Yan Jing College of Geo-exploration Science and Technology Jilin UniversityChangchun 130026China College of Earth Sciences Jilin UniversityChangchun 130061China School of Earth Science and Resources China University of GeosciencesBeijingBeijing 100083China Department of Earth Sciences University of AdelaideAdelaideSouth Australia 5005Australia Exploration and Development Research Institute Daqing Oilfield Limited CompanyDaqing 163712China Tianjin Center China Geological SurveyTianjin 300170China

The closure of Paleo-Asian Ocean is considered to have occurred along the Solonker Suture in the southernmost segment of the Central Asian Orogenic Belt(CAOB),the largest Phanerozoic accretionary orogen on the *** suture branches to the east to form the northern Hegenshan-Heihe Suture and the southern Solonker-Changchun *** Hegenshan-Heihe Suture is an ideal natural laboratory for studying the post-collisional geodynamic processes operating in a soft collision zone driven by divergent double-sided *** we report results from an integrated study of the petrology,geochronology,geochemistry,and Sr-Nd-Hf isotopic compositions of the Early Carboniferous-Early Permian mag-matic suite in the Hailar Basin of the Xing'an-Erguna *** Early Carboniferous igneous rocks are represented by 356-349 Ma andesitic tuffs,exhibiting typical subduction-related features,such as enrichment in large-ion lithophile elements and depletion in high-field-strength *** features,together with the relatively depleted Sr-Nd-Hf isotopic compositions,constant Nb/Y values,but highly variable Rb/Y and Ba values indicate that these rocks were generated by partial melting of a depleted mantle wedge metasomatized by slab-derived *** late Carboniferous-Early Permian magmatic suite(317-295 Ma)is characterized by high Sr contents(313-1080 ppm)and low Y contents(5-13 ppm),and these can be subdivided into calc-alkaline adakitic rocks and high-K calc-alkaline adakitic *** calc-alkaline adakitic rocks have higher values of Sr/Y,(Sm/Yb)_(source normalized),and Mg#,and lower values of Y,_(Ybsource normalized),and K_(2)O/Na_(2)O than the high-K calc-alkaline adakitic rocks,which suggests that the former was generated by partial melting of foundered lower continental crust and the latter by partial melting of normal lower continental *** on our new data,in conjunction with those in previous studies,we conclude that the tectonic evolution of the Hegenshan-H

关键词： Soft collision Lithospheric dripping Double-sided subduction Central Asian Orogenic Belt late paleozoic

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