Late Mesozoic and Cenozoic thermotectonic evolution along a transect from the north China craton through the Qinling orogen into the Yangtze craton,central China
作者单位：School of Earth SciencesUniversity of MelbourneMelbourneAustralia Department of Geology and GeophysicsYale UniversityNew HavenConnecticutUSA Department of Geological SciencesUniversity of Texas at AustinAustinTexasUSA
会议名称：《中国科学院地质与地球物理研究所2006学术年会》
会议日期：2007年
学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学]
摘 要：Cretaceous and Cenozoic reactivation of the Triassic Qinling-Dabie orogen between the north China and Yangtze cratons resulted from the combined effects of Pacific subduction-back-arc extension in east China and collisions in west *** report new apatite fission track and apatite and zircon(U-Th)/He data from east Qinling along a 400-km-long N-S transect from Huashan through the Qinling orogen to *** ages show a general pattern of younging *** major cooling phases are defined by modeling the multiple thermochronologic data *** first phase occurred locally in the North and South Qinling during the late Triassic to early Jurassic,following heating associated with the Triassic Yangtze subduction and exhumation of the Wudang metamorphic core complex on the cratonal edge.A second phase represents regional exhumation between 100 and 60 Ma,coeval with rifting marked by the Late Cretaceous-Eocene(K2-E) red bed deposition in eastern China and possibly indicating a link with Pacific subduction-back-arc extension in eastern China;however,it may also have been superimposed by eastward tectonic escape resulting from the Lhasa-West Burma-Qiangtang-Indochina *** third cooling phase was initiated at 5 Ma exclusively in the north Qinling and in the footwall of the graben-bounding normal fault of the Weihe graben in the Lesser *** suggest the third phase was related to reactivation of the Qinling fault system as a result of eastward tectonic escape imposed by the India-Asia collision at 0 Ma.