江山—绍兴断裂带构造格局的新元古代SHRIMP锆石U-Pb年龄证据  

SHRIMP zircon U-Pb dating of the Jiangshan-Shaoxing faulted zone in Zhejiang and Jiangxi

作　　者：高林志[1] 张恒[1] 丁孝忠[1] 刘燕学[1] 张传恒[2] 黄志忠 许兴苗 周宗尧 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国地质大学(北京),北京100083 [3]江西省地质调查院,江西南昌330201 [4]浙江省地质调查院,浙江萧山311203

出　　处：《地质通报》2014年第6期763-775,共13页Geological Bulletin of China

基　　金：中国地质调查局项目(编号:121201011120131);全国地层委员会项目(编号:1212011120142);全国油气基础地质研究与编图项目(编号:2011ZX05043-005)

摘　　要：报道采自双溪坞群不同岩组岩石样品的锆石年龄,其中,平水组英安质凝灰岩SHRIMP锆石U-Pb年龄为908.2±6.8Ma,双溪坞群北坞组安山岩年龄为901.6±5.5Ma,双溪坞群章村组火山角砾岩安山质角砾岩年龄为899±8Ma,上覆河上镇群骆家门组底砾岩(花岗闪长岩)SHRIMP锆石U-Pb年龄为878.96±4.5Ma。通过年龄数据探讨位于该断裂带的构造背景,依据该年龄数据限定区域地层对比和构造演化序列。锆石U-Pb年龄和地球化学标示了江山—绍兴断裂带北侧双溪坞群的沉积地层,地球化学分析表明该群代表了新元古代早期华南洋的中间岛弧。上述年龄为江山—绍兴断裂带变质地层的对比增添了可靠的年龄依据。This paper reports SHRIMP zircon U-Pb ages （908~878Ma） of andisite and tuff of the Early Neoproterozoic Shuanxiwu Group on the northern side of the Jiangshan-Shaoxing faulted zone and discusses the tectonic background and regional stratigraphic correlation and tectonic evolution of the Jiangshan-Shaoxing faulted zone. The SHRIMP U-Pb ages and geochemical characteristics indicate the Early Neoproterozoic inner arc of the Shuanxiwu Group on the northern side of the Jiangshan-Shaoxing faulted zone. The SHRIMP U-Pb dating data obtained by the authors can provide new evidence for the correlation of metamorphosed strata in the Jiangshan-Shaoxing faulted zone.

关 键 词：江山-绍兴断裂带 双溪坞群 SHRIMP锆石U-PB年龄 浙江 

分 类 号：P534.3[天文地球—古生物学与地层学] P597.3[天文地球—地质学]