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Journal of China University of Geosciences 2006年第4期17卷 302-309页

作者：王岸王国灿谢德凡刘德民 Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan 430074 China

Apatite fission track （AFT） thermochronology of seven samples from the Xiaonanchuan （小南川） pluton in the kunlun （昆仑） pass area was carried out, for the purpose of determining the timing of cooling and the relation between the exhumation and the morphotectonic processes. The AFT ages yield low denudation rates of 0. 020--0. 035 mm/a during the late Miocene, which correspond to a stable geomorphic and weak tectonic uplifting environment. The low denudation rates can be considered as the approximate tectonic uplifting rates. The AFT geochronology shows puroxysmully rapid cooling since the Pliocene and an apparent material unroofing of more than 3 km in the Xiaonanchuan area. This was not the result of simple denudation. The rapid cooling was coupled with the intensive orogeny since the Pliocene, which was driven by tectonic uplifting. The accelerated relief building was accompanied by a series of faulting, which caused the basin and the valley formation and sinking. The space pattern of the AFT ages also shows differential uplifting, which decreases northwardly. This trend is supported by the regional AFT data, which indicate that the exhumation decreases northwardly in eastern kunlun. This trend also exists in cast-west orientation from the western kunlun range to the eastern. The uplif- ting trend is also supported by gcomorphic characteristics including the elevation and the relief differences well as the distribution of the Late Cenozoic volcanism.

关键词： eastern kunlun Tibet Xiaonanchuan apatite fission track morphotectonic Pliocene.

Cenozoic tectonic and sedimentary evolution of southern Qaidam Basin, NE Tibetan Plateau and its implication for the rejuvenation of eastern kunlun Mountains

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Science China Earth Sciences 2014年第11期57卷 2726-2739页

作者： MAO LiGuang XIAO AnCheng WU Lei LI BenLiang WANG LiQun LOU QianQian DONG YouPu QIN SuHua Department of Earth Sciences Zhejiang University Research Center for Structures in Oil & Gas Bearing Basins Ministry of Education PetroChina Research Institute of Petroleum Exploration & Development Qinghai Oilfield Company PetroChina Zhejiang No.3 Geology Group Research Institute of BGP inc. China National Petroleum Corporation

The eastern kunlun Mountains play an important role in the growth and eastward extrusion of the Tibetan Plateau. Tectonic and sedimentary study of the Cenozoic Qaidam Basin, especially the southern part, provides key evidence for understanding their evolution. Here we present evidence including isopach maps, seismic sections and sedimentary analysis of single well to illustrate the sedimentary development of the basin and the structural features of its southern margin. The Qaidam Basin extended across Qiman Tagh-eastern kunlun Mountains in the early Cenozoic and withdrew northward at ca. 35.5 Ma, and then buckled as an EW striking elliptical depression since ca. 14.9 Ma, with the main depocenter migrating eastward. Our results support the view that the Kumukol and Hoh Xil basins joined the Qaidam Basin in the early Cenozoic time and we propose the eastern kunlun Mountains uplifted in the mid-Miocene.

关键词： NE Tibetan Plateau Qaidam Basin eastern kunlun Cenozoic mid-Miocene

Discovery of the Jiawengmen Stromatolite Assemblage in the Southern Belt of eastern kunlun, NW China and Its Significance

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Acta Geologica Sinica(English Edition) 2005年第4期79卷 471-480页

作者： BIAN Qiantao ZHU Shixing I. I. POSPELOV M. A. SEMIKHATOV SUN Shufen CHEN Daizhao NA Chunguang Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Tianjin Institute of Geology and Mineral Resources China Geological Survey Tianjin 300170 China Geological Institute Russian Academy of Sciences Moscow 119017 Russia

This paper reports a newly discovered Late Mesoproterozoic-Early Neoproterozoic stromatolite assemblage, named here the ＂Jiawengmen stromatolite assemblage＂, represented by a Conophyton-Baicalia association in the Jiawenmen area in the southern belt of the eastern kunlun. This stromatolite assemblage is dominated by large-scale conical stromatolites and related elements, i.e., Conophyton garganicus var. inkeni, C. cf. ressoti Menchikov, Jacutophyton cf., Conicodomenia f., which commonly co-exist with elements of the group of Baicalia. This assemblage can be correlated with that of the middle Jixian-middle Qingbaikou System in North and Northwest China, but is different from that in South China. Correlation can also be made with that in the upper horizon of the Middle Riphean-lower horizon of the Upper Riphean in the South Ural Mountains and Siberia of Russia, in North Africa, and in the Alaskan Peninsula of North America. These facts suggest that the Jiawengmen stromatolite assemblage probably colonized during 1300-850 Ma ago. Accordingly, the stromatolite-bearing carbonate rocks are then proposed to correspond to the middle Jixian System-middle Qingbaikou System or the upper Middle Riphean-lower Upper Riphean. Our stromatolite data further suggest that a Precambrian microblock, named the Xialawen microblock here, occurred in the southern belt of eastern kunlun, the western part of the Maqên microblock. Similar stromatolite assemblages in the Maqên microblock and those blocks that occurred in North China, Siberia and North Africa point to similar paleogeographic and paleoenvironmental conditions. These microblock and blocks were probably located at low latitudes and on the continental margins of the Rodinian supercontinent, where warm epicontinental seas were favorable to widespread colonization of stromatolites during the Late Mesoproterozoic-Eady Neoproterozoic. However, these stromatolite assemblages are quite different from those of the South China block, which

关键词： stromatolite Precambrian Rodinia supercontinent eastern kunlun Tibetan Plateau

Distribution of Rare Earth Elements in Early Permian Reef-Island Ocean Sediments in eastern kunlun

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Acta Geologica Sinica(English Edition) 2000年第1期74卷 68-73页

作者： WANG Yongbiao XU Guirong LIN Qixiang GONG Shuyun Paleontology Laboratory Faculty of Earth Sciences China University of Geosciences Wuhan 430074 Hubei

Abstract: Based on the study of stratigraphy and fossils, the Early Permian ocean in eastern kunlun is recognized as a kind of reef-island ocean, in which there exist many different kinds of sediment, including patch carbonate platform, reef facies, transitional facies and deep basin sediments. It has been found that the total contents of REEs increase gradually from carbonate platform facies to deep basin facies. Meanwhile, sediments of different facies have different REE distribution patterns and different Ce anomalies. Most of the sediments of patch carbonate platform facies or reef facies are characterized by extremely negative Ce anomalies or moderately negative Ce anomalies (Ce/Ce*=0.33 to 0.55), and medium or thin-bedded limestones of transitional facies by moderately negative Ce anomalies (Ce/Ce*=0.49 to 0.60). However, sediments of deep basin facies show weak or no negative Ce anomalies (Ce/Ce*=0.69 to 1.47), among which the value of Ce/Ce* in the radiolarian chert is 1.47.

关键词： rare earth elements reef-island ocean Early Permian eastern kunlun

Application of wide-field electromagnetic method in shale gas survey in eastern kunlun,Qinghai province,China

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Journal of Central South University 2020年第11期27卷 3388-3397页

作者： YU Zhong-hong YAN Ling-qin CAI Zhi-jie WANG Jin-hai XU Yong-feng LIN Jia-fu MA Long The Third Geological Exploration Institute of Qinghai Province Xi’ning 810000China Qinghai Geological Survey Xi’ning 810000China The Fourth Geological Exploration Institute of Qinghai Province Xi’ning 810000China Key Laboratory of Shale Gas Resources of Qinghai Province Xi’ning 810000China

In order to study the distribution of shale gas reservoir in the Babaoshan Basin of eastern kunlun,the wide-field electromagnetic(WFEM)survey was carried out to obtain the spatial distribution characteristics of the underground electrical volume resistivity based on the delineation of the scope of the Babaoshan Basin by regional gravity *** basic characteristics of the basement,basin framework,and extension,vertical change,burial depth of dark mud shale in this area were identified,and the electrical distribution of the Babaoshan mud shale horizon was revealed,which has been proved to be a good geological effect by *** exploration results show that the WFEM has significant effects on the exploration of shale gas occurrence strata,which meets the needs of investigation and evaluation of multi-layered and large-scale shale gas,and plays a good demonstration role in the follow-up shale gas exploration.

关键词： wide field electromagnetic method shale gas eastern kunlun Babaoshan Basin

Lower Permian formations of different geodynamic environments in A'nyemaqen ophiolitic zone (Buqingshan Mts., eastern kunlun, Qinghai Province, China)

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Journal of Geoscientific Research in Northeast Asia 2005年第1期8卷 15-32页

作者： I. I. Pospelov E. Ya. Leven BIAN Qian-tao O. A. Korchagin Geological Institute Russian Academy of Sciences Moscow 119017 Russia Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

Lower Permian formations within the Buqingshan Mountains （A＇nyemaqen ophiolitic zone, eastem sector of the eastern kunlun） were formed in the following paleogeodynamic environments （from north to south）：（ 1 ） shelf and slope of a passive continental margin in a marginal sea; （2）partially Permian metamorphic rocks of subduction-accretion complexes and volcanogenic rocks of an ensimatic island arc, of the age limited from above by the Asselian - Sakmarian; and （3） an island are slope and oceanic trench. Subduction-accretion complexes and the island are volcanites are overlain with a sharp angular unconformity by a carbonate-conglomerate sequence, which presents as local molasse of the Early Permian age. Based on fusulinids from the basal limestone, the age of the local molasse is first defined as the Yakhtashian-Bolorian, i.e, Artinskian-Kungurian （？）. The thorough investigations revealed that the initial closure of the eastern Paleotethys within the eastern kunlun corresponded to the Sakmarian-Yakhtashian （Artinskian） boundary, whereas in the western Paleotethys sector （Northern Pamirs） the closure occurred considerably earlier, prior to the Late Bashkirian. Thus, the idea that the Paleotethys in the eastern kunlun reached its maximum width in the Permian, is highly questionable. During the Early Permian the A＇nyernaqen branch of the Paleotethys intensely decreased. Beginning from the Bolorian （Kungurian） and up to the end of the Permian this branch represented its relict in the form of a marginal sea depression. It may be suggested that the Paleotethys closure in the A＇nyemaqen took place gradually from the west to the east and covered a long period from the Late Carboniferous to the terminal Early Permian.

关键词： Lower Permian formations ophiolitic zone Paleotethys eastern kunlun China

Depositional model of Early Permian reef-island ocean in eastern kunlun

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Science China Earth Sciences 2001年第9期44卷 808-815页

作者：王永标徐桂荣林启祥龚淑云 Faculty of Earth Sciences China University of Geosciences

Many fusulinid fossils have been found in thin- to middle-bedded limestones which are distributed between the Early Permian limestone hills and formerly considered as Early Triassic. The fusulinid fossils, identified asNeoshwagerina sp.,Verbeekina sp. andSchwagerina sp., can also be found in massive limestone hills. At the same time, Early Permian radiolarian chert of deep basin facies was discovered in Animaqing. All the above show that the massive limestone hills, thin- to middle-bedded limestones and radiolarian chert belong to syndeposits in Early Permian ocean. The sediments in the study area can roughly be divided into three types: shallow facies, basin facies and transitional facies. The carbonate buildup can be subdivided into massive bioclastic limestone and reef framestone. Basin facies contains thin- or middle-bedded limestone, abyssal red mudstone or ooze, blue-green mudstone and radiolarian chert. Transitional facies includes reef talus and platformal skirt facies. The Early Permian ocean in eastern kunlun is recognized as a kind of reef-island ocean environment according to distribution and composition of different facies. The reef-island ocean in eastern kunlun is characterized by reef islands (or carbonate buildups) alternating with basins, complicated sea-floor topography, sharp facial change and well-developed reefs.

关键词： reef-island ocean Early Permian eastern kunlun