| 重庆秀山凉桥板溪群红子溪组凝灰岩SHRIMP锆石测年及其意义 |
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| 引用本文： | 汪正江 王,剑 谢,渊,杨,平 卓皆文.重庆秀山凉桥板溪群红子溪组凝灰岩SHRIMP锆石测年及其意义[J].中国地质,2009,36(4):761-768. |
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| 作者姓名： | 汪正江 王 剑 谢 渊 杨 平 卓皆文 |
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| 作者单位： | 1. 国土资源部成都地质矿产研究所,四川,成都,610082
2. 国土资源部成都地质矿产研究所,四川,成都,610082;中国地质科学院研究生部,北京,100037 |
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| 基金项目： | 中国地质调查局“中上扬子海相含油气盆地分析与油气成藏条件综合调查评价”项目(1212010733505);;“雪峰山西侧海相油气地质调查”项目(1212010782003)资助 |
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| 摘 要： | 关于板溪群的时代归属及其地层划分对比,一直以来存在较大争议,为此作者在重新研究了秀山—梵净山地区板溪群的沉积序列及其演化的基础上,首次对秀山凉桥地区的板溪群红子溪组顶部的晶屑凝灰岩进行了SHRIMP锆石U-Pb测年,研究显示板溪群早期的盆地扩张阶段结束于790Ma左右,随后盆地转入快速充填和差异升降阶段。地层对比研究表明,秀山—梵静山地区的板溪群沉积仅相当于黔东的下江群、湘西的板溪群下部,沉积时限为820～790Ma,是新元古代中期Rodinia裂解背景下的裂陷盆地的早期充填。
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| 关 键 词： | 秀山凉桥 新元古代 板溪群 晶屑凝灰岩 SHRIMP锆石U-Pb测年 |
SHRIMP zircon U-Pb dating for crystal tuff from Hongzixi Formation of Banxi Group in Xiushan area,Chongqing,and its significance |
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| WANG Zheng-jiang,WANG Jian,XIE Yuan,YANG Ping,ZHUO Jie-wen.SHRIMP zircon U-Pb dating for crystal tuff from Hongzixi Formation of Banxi Group in Xiushan area,Chongqing,and its significance[J].Chinese Geology,2009,36(4):761-768. |
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| Authors: | WANG Zheng-jiang WANG Jian XIE Yuan YANG Ping ZHUO Jie-wen |
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| Institution: | 1.Chengdu Institute of Geology and Mineral Resources;Chengdu 610082;Sichuan;China;2.Graduate School;Chinese Academy of Geological Sciences;Beijing 100037;China |
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| Abstract: | There has long existed considerable controversy concerning the epoch and stratigraphic division of Banxi Group.Based on restudying the sedimentary sequence and evolution of Banxi Group in Xiushan-Fanjingshan area,the authors performed the crystal tuff SHRIMP zircon U-Pb dating for Hongzixi Formation of Banxi Group in Xiushan area.The result suggests that the expansion of the early Banxi basin ended at about 790 Ma,followed immediately by the quick infilling and differential uplifting stage.The deposition ep... |
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| Keywords: | Liangqiao in Xiushan area Neoproterozoic Banxi Group crystal tuff SHRIMP zircon U -Pb dating |
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