华南中生代岩浆岩时空分布和迁移与古太平洋板块俯冲过程  

The Spatial-Temporal Distributions and Migrations of Mesozoic Magmaism in South China and Subduction Process of the Paleo-Pacific Plate

作　　者：刘凯[1] 厉子龙[2] 徐维光 叶海敏[1] 赵希林[1] 胡逸州 周静[2] 毛建仁[1] 

机构地区：[1]中国地质调查局南京地质调查中心,南京210016 [2]浙江大学地球科学系,杭州310027 [3]福建省地质调查研究院,福州350013

出　　处：《矿物岩石地球化学通报》2016年第6期1141-1155,共15页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：中国地质调查局科技外事部基础地质研究项目(1212010611805;1212010911012;1212011121098);中国地质调查局基础部基础地质项目(1212011120120;12120100800015004);国家国际科技合作专项(2011DFA22460);浙江省科技厅公益性技术应用研究计划项目(2014C33023);国家自然科学基金项目(41373021)

摘　　要：本文论述了近年来在华南中生代岩浆岩时空分布和迁移以及地质构造研究方面所取得的新成果,认为单一的古太平洋板块俯冲不可能形成如此多方向和如此宽的(>1000km)构造变形和岩浆岩;评述了目前被广泛引用在华夏地块晚中生代岩浆活动的古太平洋板块俯冲模式,确定了其主要贡献以及有待完善的要点。提出华南在中侏罗世(约175±5Ma),古太平洋板块进入大致由南往北斜向俯冲为主的构造体系,晚侏罗世早期(约120Ma)后太平洋板块俯冲方向发生了急剧变化,为古太平洋板块向西正向俯冲的构造体系,在白垩世中期(85±5Ma)由于华南大陆已成为被动陆缘。此时,大致同时代的东南沿海和台湾东部处于完全不同的构造背景,前者为伸展型的板内环境,后者为挤压型的弧陆碰撞环境。The spatial-temporal distributions and migrations of Mesozoic magmatism suggest that Mesozoic igneous rocks in South China can be divided into “two regions and four belts”,which are thought to be the products of convergence of mul-tiple blocks as well as multi-stages and multi-directional compressional-extensional orogeny.However,it is impossible that the single subduction of the paleo-Pacific plate to form multi-direction and wide（〉1000km）tectonic deformation and mag-matic rock belt.In this paper,We evaluated the model of the paleo-Pacific Plate subduction,which widely circulated on late Mesozoic magmatism in Cathaysian Block at present,to address the its main contribution and shortage.We put forward that approximately middle-Jurassic（175±5Ma）,the South China entered the paleo-Pacific tectonic system,roughly from south to north oblique subduction of the paleo-Pacific Plate.After 120Ma,the subduction direction of paleo-Pacific Plate has changed to westward forward subduction dramatically,At the end of Mesozoic,the South China continent has become a passive margin so that there are the different tectonic setting roughly contemporary in southeastern China coast and east-ern Taiwan.The former is the within-continent tectonic environment of the extensional-breakup setting,where as and the latter is the arc tectonic environment with collision-compresive stress.

关 键 词：时空分布 中生代岩浆岩 板块俯冲 华南 

分 类 号：P588.1[天文地球—岩石学] P542[天文地球—地质学]