| 湖南冷家溪群划分及同位素年龄约束 |
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| 引用本文： | 孙海清,黄建中,郭乐群,陈俊.湖南冷家溪群划分及同位素年龄约束[J].华南地质与矿产,2012,28(1):20-26. |
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| 作者姓名： | 孙海清 黄建中 郭乐群 陈俊 |
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| 作者单位： | 湖南省地质调查院,长沙,410116 |
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| 基金项目： | 湖南省地质系列图件编制与综合研究（1212011120125）; 国家自然科学基金重点基金项目《华南新元古代＂楔状地层＂沉积充填系列及其大地构造属性研究》（41030315）资助 |
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| 摘 要： | 依据区域岩石组合特征,参照岩石地层的划分原则,对冷家溪群进行重新划分:下部为海相深水盆地沉积细碎屑岩系,划分出易家桥组、潘家冲组、雷神庙组;上部为盆地斜坡相浊流(扇)沉积粗碎屑岩系,分为黄浒洞组、小木坪组、大药菇组。在冷家溪群各岩组中的凝灰岩夹层内取得一批新的SHRIMP锆石U-Pb测年数据,对其沉积时代归属提供了新的约束。锆石SHRIMP年龄数据表明其沉积时限介于820～>862 Ma之间,时代属于新元古代早期。
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| 关 键 词： | 划分对比 冷家溪群 同位素年龄 新元古代 湖南 |
Subdivision and Isotopic Age of Lengjiaxi Group in Hunan Province |
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| SUN Hai-Qing,HUANG Jian-Zhong,GUO Le-Qun,CHEN Jun.Subdivision and Isotopic Age of Lengjiaxi Group in Hunan Province[J].Geology and Mineral Resources of South China,2012,28(1):20-26. |
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| Authors: | SUN Hai-Qing HUANG Jian-Zhong GUO Le-Qun CHEN Jun |
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| Institution: | (Hunan Institute of Geological Survey,Changsha 411000,Hunan,China) |
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| Abstract: | According to regional rock assemblages and strata subdivision principle,Lengjiaxi Group can be subdivide into upper part of marine deep-water basin deposited fine clastic rocks（including Yijiaqiao Formation,Panjiachong Formation and Leishenmiao Formation） and lower part of basin slope turbidite deposited coarse clastic rocks（including Huangxudong Formation,Xiaomuping Formation and Dayaogu Formation）.The zircons from tuff interlayers of every Formation of Lengjiaxi Fromation are tested by SHRIMP U-Pb dating method to constraint the sedimentary ages,which indicated that the sedimentary age of Lengjiaxi Group is between 820 to 862 Ma,and belongs to early Neoproterozoic. |
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| Keywords: | classification and correlation Lengjiaxi Group isotopic age Neoproterozoic Era Hunan province |
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