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

来源 :中国科学D辑(英文版) | 被引量 : 0次 | 上传用户:myyiao123
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
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 Jurassic-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 development 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 Shangcheng-Macheng faults brought the doming extension of the orogen shrunk sharply in Late Cretaceous. 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 regarded 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 intensive 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.
其他文献
The question whether there have been Quaternary glaciations in the Da Hinggan area has puzzled glacial geologists for many years because no sufficient glacial e
The Yecheng-Shiquanhe profile runs over the western Tibetan Plateau from the south margin of the Tarim Basin, crossing the west Kunlun orogeny, to the east of K
This paper points out an error in the principle figure and the waveform figure of the thermal resistance standard IEC747-7, which describes the relation between
A new tapejarid pterosaur Huaxiapterusjii gen.et sp.nov.is erected based on a nearly complete skeleton with a skull.The skull morphology of Huaxiapterus jii gen
A class of plateaued functions has been got by using the Maiorana-McFarland construction. A variety of desirable criteria for functions with cryptographic appli
The cultural deposits at pits T1 and T2 in Zhangkou Cave are intercalated with several flowstone layers. U-series dates show that the capping and 2nd flowstone
We have searched the Bombyx mori genome for members of the major enzyme family, the Cytochrome P450s, which carry out multiple reactions to enable organisms to
As the unprecedented global warming is under way, the glacier retreat is getting more and more serious. In the inland arid area of Northwest China, due to very
The Tan-Lu Fault was once a transform fault in the Paleotethys,west of which was the Qinling-Dabie Ocean separating the Yangtze Craton from the North China Crat