Survival of eclogite xenolith in a Cretaceous granite intruding the Central Dabieshan migmatite gneiss dome(Eastern China) and its tectonic implications
作者单位：Department of Earth and Planetary Sciences Nagoya UniversityChikusa-kuNagoya 464-8602Japan Institut des Sciences de la Terre d'Orleans Universite d'Orleans45067 Orleans Cedex 2France UMR Geosciences Azur Universite Nice-Sophia Antipolisparc ValroseNiceFrance UMR Dylith Universite de Montpellier Ⅱ34060 Montpellier Cedex 5France
会议名称：《中国科学院地质与地球物理研究所2007学术年会》
会议日期：2008年
学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学]
基 金：this study are issued from the National Key Basic Research Program(Grant No.2005CB422101) NSFC(40202021,40472116) JSPS is acknowledged for providing a Grant of Postdoctoral Fellowship for Foreign Researchers(14-02060 to W.L.) Grant-in-Aid for Scientific Research(14540448 and 18340172 to M.E.)
关 键 词：Eclogite xenolith Mesozoic granite Radiometric ages Exhumation model Dabieshan China
摘 要：Investigation of an eclogite xenolith,discovered in a Cretaceous granite from the Central Domain of the Dabieshan massif in eastern China, yields new petrological insights into the high to ultrahigh -pressure metamorphism,experienced by the Qinling-Dabie *** to inclusion as a xenolith in the granite during the Early Cretaceous,this eclogite xenolith had recorded a complex metamorphic evolution that complies with subduction and exhumation processes experienced by the continental crust of the South China ***-preserved mineral parageneses substantiate the prograde and retrograde stages revealed by inclusions in porphyroblastic garnet and zoned minerals such as garnet,omphacite and amphibole in the *** relatively low P/T re-equilibration during a late metamorphic stage was textually inferred by the presence of aluminous and calcic-subcalcic amphiboles such as katophorite,edenite,taramite and pargasite as main matrix *** to our U/Pb,Rb/Sr and new Ar/Ar geochronological results,namely109±1 and 112±2 Ma plateau ages for muscovite and amphiboles,respectively,two successive but distinct cooling stages account for the thermal history of the granite-migmatite gneiss dome that forms the Central Dabieshan *** argue that prior to the Cretaceous doming,the Central Dabieshan Domain experienced a tectono-metamorphic evolution similar to that observed in the high-pressure to ultra high-pressure units developed in the Southern Dabieshan Domain and Hong’an massif.