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Cenozoic Exhumation History of the East Kunlun Orogenic Belt Constrained by apatite fission-track thermochronology

Acta Geologica Sinica(English Edition) 2018年第3期92卷 1255-1256页

作者： YANG Wei XIA Guoqing WU Chihua YI Haisheng Institute of Sedimentary Geology Chengdu University of Technology Chengdu 610059 Sichuan China 282 Brigade of Sichuan Nuclear Geology Deyang 618000 Sichuan China State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Chengdu 610059 Sichuan China School of Marine Sciences Sun Yat-sen University Zhuhai 519082 Guangdong China

Objective The East Kunlun Orogenic belt constitutes the first marked change in the topographic reliefs north of the Qinghai-Tibet *** Cenozoic tectonic evolution of this orogenic belt is crucial for understanding the remote deformational effects of the Eurasian plate collision and the migration track at the northern margin of the ***,when and how the uplift occurred remains

关键词： Cenozoic Exhumation History the East Kunlun Orogenic Belt Constrained apatite fission-track thermochronology

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Cenozoic Exhumation of Larsemann Hills,East Antarctica:Evidence from apatite fission-track thermochronology

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Acta Geologica Sinica(English Edition) 2010年第2期84卷 306-320页

作者： CHEN Xuanhua JIANG Rongbao WAN Jinglin XU Gang JIANG Mei CHEN Danhong KeyLaboratory ofNeotectonicMovementand Geohazard Ministry ofLandandResources 100081China Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China Institute of Geology China Earthquake Administration Beijing 100029 China Chinese Arctic and Antarctic Administration Beijing 100860 China

Does Cenozoic exhumation occur in the Larsemann Hills, East Antarctica？ In the present paper, we conducted an apatite fission-track thermochronologic study across the Larsemann Hills of East Antarctica. Our work reveals a Cenozoic exhumation event at 49.8 ± 12 Ma, which we interpret to be a result of exhumation caused by crustal extension. Within the uncertainty of our age determination, the timing of extension in East Antarctica determined by our study is coeval with the onset time of rifting in West Antarctica at c.55 Ma. The apatite fission-track cooling ages vary systematically in space, indicating a coherent block rotation of the Larsemann Hills region from c.50 Ma to c.10 Ma. This pattern of block tilting was locally disrupted by normal faulting along the Larsemann Hills detachment fault at c.5.4 Ma. The regional extension in the Larsemann Hills, East Antarctica was the result of tectonic evolution in this area, and may be related to the global extension. Through the discussion of Pan-Gondwanaland movement, and Mesozoic and Cenozoic extensions in West and East Antarctica and adjacent areas, we suggest that the protracted Cenozoic cooling over the Larsemann Hills area was caused by extensional tectonics related to separation and formation of the India Ocean at the time of Gondwanaland breakup.

关键词： apatite fission-track thermochronology exhumation normal faulting Cenozoic Larsemann hills East Antarctica

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Cretaceous and Cenozoic cooling history across the ultrahigh pressure Tongbai-Dabie belt,central China,from apatite fission-track thermochronology

Cretaceous and Cenozoic cooling history across the ultrahigh...

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中国科学院地质与地球物理研究所2006学术年会

作者： Barry P.Kohn Asaf Raza Andrew J.W.Gleadow School of Earth Sciences The University of MelbourneMelbourneVictoria 3010Australia

The crystalline terrane of the Tongbai-Dabie region,centralChina,comprising the Earth’s largest ultrahigh-pressure(UHP) exposure was formed during Triassic collision between the Sino-Korean andYangtze *** apatite fission-track(AFT) data presented here from the UHP terrane,extends over a significantly greater area than reported in previous studies,and includes the(eastern) Dabie,the Hong’an(northwestern Dabie) and Tongbai *** new data yield ages ranging from44±3 to 142±36Ma and mean track lengths between□10 and 14.4μ.*** history models based on the AFT data taken together with published 40Ar/39Ar,K -Ar,apatite and zircon(U-Th)/He and U-Pb data,exhibit a three-stage cooling pattern that is similar across the study region,commencing with an Early Cretaceous rapid cooling event, followed by a period of relative thermal stability during which rocks remained at temperatures within the AFT partial annealing zone(□60-110℃) and ending with a possible renewed phase of accelerated cooling during Pliocene to Recent *** first cooling phase followed large-scale transtensional deformation between□140 and 110 Ma and is related to Early Cretaceous eastward tectonic escape and Pacific back arc *** this phase and the subsequent slow cooling phase,a transition period from□120 to 80Ma(to□70 to 45Ma along the Tan-Lu fault) was characterised by a relatively low cooling rate(□3-5℃/Ma).This transition is likely related to a tectonic response associated with the mid-Cretaceous subduction of the IzanagiPacific plate aswell as lithospheric extension and thinning in eastern *** present regional AFTage pattern is therefore basically controlled by the Early Cretaceous rapid cooling event,but finally shaped through active Cenozoic *** the transition phase the subsequent slow cooling phase pattern implies a net reduction in horizontal compressional stress corresponding to increased extensionrates along the continental margin due to the de

关键词： apatite fission-track thermochronology Tectonics Denudation Ultrahigh pressure rocks Tongbai-Dabie Central China

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