中国东南部晚中生代花岗岩成因与深部动力学机制--古太平洋板块反复俯冲-后退模式  

Petrogenesis and Geodynamics of Late Mesozoic Granitoids in SE China:Tectonic Model Involving Repeated Slab-advance-retreat of the Paleo-Pacific Plate

作　　者：姜耀辉[1] 王国昌[1] 

机构地区：[1]南京大学地球科学与工程学院,内生金属矿床成矿机制研究国家重点实验室,南京210023

出　　处：《矿物岩石地球化学通报》2016年第6期1073-1081,共9页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金项目(41272083);国家重点基础研究发展计划项目(2012CB416706)

摘　　要：中国东南部晚中生代构造-岩浆活动强烈,花岗岩广泛分布。笔者近几年在赣南和闽西北鉴别出一系列早侏罗世镁铁质岩石和A型花岗岩,其中A型花岗岩呈北东向展布,构成一条早侏罗世A型花岗岩带。结合前人研究成果发现,中国东南部还存在另外3条A型花岗岩带,分别为晚侏罗世、早白垩世和晚白垩世A型花岗岩带,它们与早侏罗世A型花岗岩带一样均呈北东向展布,平行于现今海岸线,其中晚侏罗世A型花岗岩带更靠内陆一侧,早白垩世A型花岗岩带几乎与早侏罗世A型花岗岩带重叠,晚白垩世A型花岗岩带则分布于沿海地区。通过镁铁质和花岗质岩石成因综合研究,认为中国东南部晚中生代构造-岩浆活动可用古太平洋板块反复俯冲-后退模式来解释。During late Mesozoic times,extensive magmatism took place in SE China,forming widespread granitoids.Re-cently,we identify a series of Early Jurassic mafic rocks and A-type granites in southern Jiangxi and western Fujian prov-inces.The Early Jurassic A-type granites occur as a NE-trending belt.By integrated previously published data,we find that there are other three A-type granite belts in SE China,i.e.,the Late Jurassic,Early Cretaceous,and Late Cretaceous A-type granite belts,respectively,all of which are NE-trending,parallel to the present coastline.The Late Jurassic belt is located further inland,to the west of the Early Jurassic belt,whereas the Early Cretaceous belt almost overlaps the Early Jurassic belt and the Late Cretaceous belt is located at the coastal area of SE China.Integrated these observations,we pro-pose a repeated slab-advance-retreat model for the late Mesozoic magmatic evolution of SE China.

关 键 词：晚中生代 花岗岩 地球动力学机制 板片反复俯冲-后退 古太平洋板块 中国东南部 

分 类 号：P588.121[天文地球—岩石学] P542[天文地球—地质学]