Apatite-fission-track geochronology and its tectonic correlation in the Dabieshan orogen,central China

查看全文 作　　者：P. Van Den [1]Haute;R. A. [1]Donelick;J. De [1]Grave;MA [1]Changqian;P. W. [1]Reiners

机构地区：[1]Geological Institute, Gent University, Krijgslaan281 B9000, Gent, Belgium,Donelick Analytical Inc., Viola, Idaho83872-2332, USA,Geological Institute, Gent University, Krijgslaan281 B9000, Gent, Belgium,Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China,Department of Geology, Washington State University, Pullman WA99164-2812, USA

出　　处：《Science China Earth Sciences》索引2005年第48卷第4期,共15页

基　　金：supported by the Chinese National Key Basic Reseach Special Foundation Projeat(Grant No.G2000078501);the National Natural Saence Foumndation of China(Gnant Nos.40272093 and 40321603) 摘　　要：AFT data of granitoid and metamorphic samples from the Dabieshan orogen have an age range between 96.4 Ma and 41.9 Ma coupled with confined track lengths of 11.5—14.0 μm, reflecting the cooling time of rocks differentially through the 100℃± isotherm. The Juras- sic-Eogene sediments from the North Huaiyang and Hefei basin, however, yield their AFT ages of 128.8—62.0 Ma with mean track lengths of 8.6—11.9 μm, recording a complicated thermal de- velopment of the basin. These AFT data structurally allowing the coupling between the orogen and the basin are to a great extent considered as the result from the control of NNE-trending regional tectonics. It took place approximately at 95—90 Ma that the orogen developed with an abrupt shift from the doming extension to the differential transtension, which is assumed to be related with the changes of the convergence between the Western Pacific and Eurasia plates. The differentially sinistral strike-slipping from the transtension between Tanlu and Shang- cheng-Macheng faults brought the doming extension of the orogen shrunk sharply in Late Cre- taceous. In Eogene, the full-grown transtension that dominated in East Asia was caused mainly by a rapid decrease of the rates of the Western Pacific convergence, which can be therefore re- garded as a major mechanism creating the zonal anomalies of 60—40 Ma in the orogen. The thermal anomaly of 70—40 Ma zonally along the Tanlu fault cooled more slowly than the anomaly of 60—55 Ma zoning along the Shangcheng-Macheng fault, but the 60—40 Ma anomaly trending E-W in hinterlands of the orogen seems to be relicts of the doming extension as a result of inten- sive rebuilding by the transtension. In addition, the orogen was also reactivated by the far-field effect from India-Asia collision in Eogene, where major NWW-trending faults played an important role in facilitating such far-field tectonic transferring. In Oligocene to Miocene, the Dabieshan orogen remained a few thermal disturbances with their AFT ages particularly in coincidence with the time of opening and closing of the South China Sea. 关键词：AFT geochronology, TECTONIC correlation, DABIESHAN orogen.

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Apatite-fission-track geochronology and its tectonic correlation in the Dabieshan orogen,central China

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