地质通报Issue(5)：641-648,8.
江山-绍兴断裂带陈蔡岩群片麻岩SHRIMP锆石U-Pb年龄及其地质意义
SHRIMP zircon U-Pb dating of ;Neoproterozoic Chencai Complex in Jiangshan-Shaoxing fault zone and its implications
摘要
Abstract
A series of parametamorphic rocks, as the oldest metamorphosed basement in the Jiangshan-Shaoxing fault zone, consist of gneiss, schist and marble of medium-deep metamorphism and are in fault contact with the Shuangxiwu Group in Chencai area, Zhu-ji County, Zhejiang Province. Because the Chencai Group which suffered deep metamorphism and deformation is developed in the southern part of the Jiangshan-Shaoxing fault zone, most Chinese geologists assign the group to the small patch of the Cathysia Plate and make correlation with Paleoproterozoic Mayuan Group in Fujian Province or the Badu Group in Zhejiang Province and the Me-soproterozoic Tieshajie Foramtion in Jiangxi Province. Lots of zircons were collected from garnet sillimanite biotite plagiogneiss and sillimanite garnet biotite gneiss in the Xiawuzhai Formation of the Chencai Group. The zircons have a typical core, mantle and edge structure, the age of the core is usually in the range of 848~845Ma and the age of the late accretion edge is Caledonian (431Ma). Ac-cording to the zircon dating of the plagioclase gneiss of the Chencai Group, the authors consider that the Chencai Group can not on-ly be correlated with the Paleoproterozoic Mayuan Group of Fujian Province, but also with Mesoproterozoic Tieshajie Formation of Jiangxi Province. The protolith age of the Chencai Group suggests Neoproterozoic ( 848~845Ma), which is younger than that of the Shuangxiwu Group (905~877Ma) in the stratigraphic column and the stratigraphic division, and the age belongs to the domain of the Jiangnan Orogenic Belt. However, this age has an important significance in the correlation of metamorphosed provinces in the Jiang-Shan-ShaoXing fault zone and the study of its tectonic evolution.关键词
浙东南地区/陈蔡岩群/变质岩/SHRIMP锆石U-Pb年龄Key words
Southeast Zhejiang/Chencai Group/metamorphosed rock/SHRIMP zircon U-Pb ages分类
天文与地球科学引用本文复制引用
高林志,丁孝忠,刘燕学,张传恒,张恒,黄志忠,许兴苗,周宗尧..江山-绍兴断裂带陈蔡岩群片麻岩SHRIMP锆石U-Pb年龄及其地质意义[J].地质通报,2014,(5):641-648,8.基金项目
中国地质调查局项目（编号12120113013900）和全国油气基础地质研究与编图项目(编号2011ZX05043-005) （编号2011ZX05043-005）
