Zircon U-Pb dating of the Cangxi Complex-Group and the Evolution of Neoproterozoic Arc Basin System in Northeastern Hunan
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摘要: 湘东北仓溪岩群位于江南造山带中段，曾被认为属于古元古代，近年来的同位素测年显示其主要形成于新元古代早期。本次研究通过LA-ICP-MS锆石U-Pb同位素定年分析，获得仓溪岩群中绢云石英千枚岩、斜长角闪岩、透闪石岩形成年龄分别为858.3±3.7 Ma、844.3±14.0 Ma、815.0±10.0 Ma，后期辉绿岩脉侵入年龄为196.6±3.3 Ma。综合表明仓溪岩群主要形成于新元古代早期815～865 Ma之间，并受到印支期构造活动的一定影响。仓溪岩群主要是新元古代早期形成的俯冲增生杂岩，由一套变沉积岩、变基性岩或蛇绿岩残片混杂组成，是该时期扬子陆块周边广泛存在的洋壳俯冲以及扬子陆块东南缘江南造山带中段弧-陆碰撞事件的重要产物。Abstract: The Cangxi Complex-Group is located on the middle part of Jiangnan orogenic belt in northest Hunan，once considered to belong to Paleoproterozoic but in recent years form in the early Neoproterozoic through new isotopic dating. According to LA-ICP-MS zircon U-Pb isotopic dating, it is suggested thatthe formation ages of sericite quartz phyllite, amphibolites and tremolite are 858.3 ± 3.7Ma,844.3±14.0Ma and 815.0 ± 10.0Ma, and the invasion age of diabase dyke is 196.6 ± 3.3Ma.All those show that the Cangxi Complex-Group mainly formed during 815 ~ 865Main the early Neoproterozoic, and affected by Indosinian tectonic activities. The Cangxi Complex-Groupis a subduction accretionary complex formed in the early Neoproterozoic and mainly composed of a set of metasedimentary, metabasic rocks or ophiolite fragments, also important products of the widespread oceanic crust subduction around the Yangtze block and the arc-continental collision in the middle of the Jiangnan orogenic belt on the southeast margin of the Yangtze block.
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