皖赣相邻区新元古代构造演化探讨  

Discussions on Neoproterozoic tectonic evolution in Anhui-Jiangxi bordered region

作　　者：张彦杰[1] 孙磊[2] 周效华[1] 廖圣兵[1] 王存智[1] 朱意萍[1] 

机构地区：[1]南京地质矿产研究所,江苏南京210016 [2]江苏省地质调查研究院,江苏南京210018

出　　处：《地质学刊》2010年第4期351-357,共7页Journal of Geology

基　　金：中国地质调查局"安徽1:5万平里;江潭;瑶里;虹关幅区调"项目(1212010610609)

摘　　要：皖赣相邻区广布的浅变质陆缘细碎屑岩为主含少量火山物质的复理石建造体,大量高精度同位素测年数据显示,该浅变质地层应形成于821Ma^840Ma间的新元古代早期。综合沉积事件、岩浆事件和构造事件等提出皖赣相邻区新元古代经历了古扬子板块东南缘裂开—陆缘小洋盆有限俯冲—弧陆碰撞造山—造山期后陆壳裂陷沉积的构造演化过程。The flysch formation, mainly containing marginal epimetamorphic fine clastic rocks and some volcanic rocks, was widely distributed in Anhui-Jiangxi bordered region. A mass of high precision isotopic dating showed that the epimetamorphic strata were likely formed in early Neoproterozoic around 821Ma～840Ma. Integrated with deposit event, magmatic event and tectonic event, it was proposed that the southeast margin of Yangtze ancient block went through such processes in Neoproterozoic： the diving of marginal small ocean basin, the collision of arc and continent, post-orogenic rift intergrowth sedimentation of continental crust.

关 键 词：江南造山带北缘 新元古代 构造演化 岛弧火山岩 江西 安徽 

分 类 号：P542[天文地球—构造地质学] P534[天文地球—地质学]