南华系“渫水河组”的对比及其冰川沉积特征的探讨A CORRELATION OF THE "XIESHUIHE FORMATION",NANHUAN SYSTEM,WITH A DISCUSSION TO ITS GLACIAL SEDIMENTARY STRACTURES
张启锐,储雪蕾,冯连君
摘要(Abstract)：
在著名的湖南省石门县杨家坪剖面,围绕"渫水河组"的地层对比问题长期存在争论,有对比于宜昌峡区莲沱组的,有对比于本省板溪群的,也有对比于广西北部富禄组的。最近获得的年龄数据似乎确认了它对比于莲沱组的方案,但是当莲沱组年龄在原始数据基础上采用先进方法重新进行计算所得的年龄,却和广西三门街组刚发表的年龄值十分相似,于是"渫水河组"的地层位置又出现了新的问题。在目前已经看不到的一些重要冰川沉积构造的基础上,论证它应该是江口冰期的地层,并确认它与富禄组的对比。它实际上应对比于黔东北的"两界河组"。"两界河组"和"铁丝坳组"或"古城组"合起来相当于富禄组。根据地层命名规则,应该取消"渫水河组",而代之以两界河段,成为富禄组下部的一个次一级地层单位。
关键词(KeyWords)： 地层对比;同位素年龄;冰川沉积构造;“渫水河组”;两界河段;南华系;杨家坪剖面;湖南
基金项目(Foundation): 国家自然科学重点基金(No40532012);; 中国科学院知识创新重要方向项目(NoKZCX3-SW-141);; 国家自然科学基金(No40373011)资助
作者(Author): 张启锐,储雪蕾,冯连君
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