| 马慧英,孙海清,黄建中,马铁球.湘中地区高涧群凝灰岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].矿产勘查,2013,4(1):69-74 |
| 湘中地区高涧群凝灰岩LA-ICP-MS锆石U-Pb年龄及其地质意义 |
| U-Pb dating of Zicon from the Gaojian Group tuff in central Hunan Province and its geological implication |
| 投稿时间：2012-06-25 |
| DOI： |
| 中文关键词: LA-ICP-MS锆石 U-Pb年龄 凝灰岩 高涧群 湘中 |
| 英文关键词: LA-ICP-MS zircon U-Pb age tuff Gaojian Group central Hunan Province |
| 基金项目:国家自然科学基金重点基金项目(编号:41030315)和中国地质调查局项目(编号:1212011121108)共同资助。 |
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| 中文摘要: |
| 湘中地区高涧群主要分布在从江—洪江—溆浦—涟源—双峰以南,出露完整的剖面有双峰高涧、隆回石桥铺以及城步浆坪剖面。通过对高涧群砖墙湾组上部的层状凝灰岩进行LA-ICP-MS锆石U-Pb年龄测试,层状凝灰岩的30颗锆石206Pb/238U加权平均年龄为(774.9±2.6)Ma,为扬子东南缘武陵期后陆缘裂谷盆地的地层划分和对比提供了新的年代学证据。这个年龄与湘西北的相关层位的年龄对比则显得要小,而与黔东地区下江群相当层位的年龄基本一致。这一结果将有助于探讨扬子东南缘新元古代裂谷盆地演化、地层对比及其成矿效应。这对研究盆地充填序列的沉积关系与成矿效应,具有一定的地质意义。 |
| 英文摘要: |
| The Gaojian Group stata of Central Hunan regions are mainly distributed in the south of Congjiang-Hongjiang-Xupu-Lianyuan-Shuangfeng region, the outcropped completed geological section occur in Shuangfeng Gaojian, Shiqiaopu of Longhui and Chengbujiang. 30 zirconite grains were collected from tuff in the top of Zhuanqiangwan formation and the U-Pb age was dated by LA-ICP-MS, and the weighted average age of zirconite 206Pb/238U is (774.9±2.6)Ma, which provides new chronological evidence to classify and compare strata in the continental margin rift basin of post-Wuling Period in southeast edge of Yangtze platform. The dated age is obviously yonger than the age of related strata in northwestern Hunan, but close to the age of related strata in Xiajiang Group of eastern Guizhou. This finding is helpful for re-building the basin evolution, strata comparison and mineralization effect in the southeastern edge of Yangtze plateform of Neoproterozoic age. It can also be regarded as of strata significance in studying sedimental relationship and mineralization effect of basin-fill sequence. |
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