海南岛发现榴辉岩-高压麻粒岩组合  

The discovery of eclogite-high-pressure granulite association from Hainan Island, South China

作　　者：夏蒙蒙 胡娟[1,2] 胡道功 刘晓春[1,2] XIA Mengmeng;HU Juan;HU Daogong;LIU Xiaochun(Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Natural Resources,Beijing 100081,China摘要:在海南木栏头地区首次发)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]自然资源部古地磁与古构造重建重点实验室,北京100081

出　　处：《地质通报》2019年第10期1591-1594,共4页Geological Bulletin of China

基　　金：中国地质调查局项目《海南岛及近海活动断裂及地壳稳定性调查评价》(编号:DD 20190306);科技部973项目《俯冲陆壳的多层次拆离折返与部分熔融》(编号:2015CB856104)

摘　　要：在海南木栏头地区首次发现了一套榴辉岩-高压麻粒岩组合。该岩石产出于沿海潮间带中,主要由石榴子石、绿辉石、角闪石、石英和金红石组成,含或不含黝帘石和(或)斜长石。由传统的地质温压计计算获得岩石峰期变质作用的温压条件约为800~850℃、>1.5GPa,锆石U-Pb定年得到的变质时代为340~300Ma。榴辉岩-高压麻粒岩组合的发现对于深入理解海南岛构造属性、古特提斯洋东域构造演化过程等均具有重要意义。An eclogite-high-pressure(HP)granulite association were firstly discovered in the Mulantou area,northeastern Hainan Island,South China.The HP rocks occur in the coastal intertidal zone,and consist mainly of garnet,omphacite,hornblende,quartz and rutile,with or without zoisite or plagioclase.Peak p-t conditions of the rocks obtained by conventional geothermobarometers are about 800~850℃and>1.5GPa.U-Pb zircon dating yields metamorphic ages of about 340~300Ma.The occurrence of HP granulite-eclogite association is of great significance for understanding the tectonic affinity of Hainan Island and the tectonic evolution of the eastern Paleo-Tethys.

关 键 词：榴辉岩 高压麻粒岩 海南岛 

分 类 号：P588.3[天文地球—岩石学]