扬子东南缘中生代构造体制转换研究——以江西相山火山盆地为例  

Mesozoic tectonic regime transformation in southeastern margin of the Yangtze platform:taking Xiangshan volcanic basin in Jiangxi Province as an example

作　　者：唐春花[1] 闫全人[2] 陈辉明[2] 向忠金[2] 张旭 张福神[1] 宛胜[1] 

机构地区：[1]江西省地质调查研究院 [2]中国地质科学院地质研究所 [3]广东省核工业地质局二九二大队

出　　处：《资源调查与环境》2015年第1期10-20,共11页Resources Survey & Environment

基　　金：国家地质调查项目"扬子东南缘中生代盆地充填序列与构造成矿事件研究"项目(项目编号:1212011085415)资助

摘　　要：江西相山火山盆地位于中国东南部晚中生代火山-侵入杂岩带的最西端,具有明显的东西向构造域与北东向构造域叠加特征,其在扬子东南缘(浙赣段)中生代构造体制转换研究中具有重要意义。通过测定流纹英安岩和边缘相碎斑熔岩锆石LA-ICP-MS U-Pb年龄,研究其岩石地球化学、地质构造特征,认为相山火山盆地东西向构造与北东向构造的强烈转换时间为133.87±0.76 Ma至132.01±0.7 Ma之间,可代表扬子东南缘(浙赣段)中生代构造体制强烈转换时期。Xiangshan volcanic basin in Jiangxi Province is located in the west part of late Mesozoic volcanic-intrusive complexes of southeast China.EW and NE extending structural systems superposition existed in the basin is very important to research Mesozoic tectonic transformation in southeastern margin of the Yangtze platform.The results of LA-ICP-MS U-Pb dating for zircons of rhyolitic dacite and marginal cataclast lava,and research of geochemistry and structural geology show that the EW extending structural system converting NE tectonic framework occurred in 133.87±0.76 Ma to 132.01±0.7 Ma,representing the time of Mesozoic tectonic transformation in southeastern margin of the Yangtze platform.

关 键 词：火山-侵入杂岩 锆石LA-ICP-MS定年 构造体制转换 相山火山盆地 江西 

分 类 号：P588.1[天文地球—岩石学]