莲沱砂岩——南华大冰期前气候转冷的沉积记录

冯连君[1,2] 储雪蕾[1,2] 张同钢[1,2] 黄晶[1,2]

莲沱砂岩——南华大冰期前气候转冷的沉积记录

冯连君[1,2] 储雪蕾[1,2] 张同钢[1,2] 黄晶[1,2]

- [1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院矿产资源研究重点实验室,北京100029
基金项目:
本文由国家自然科学基金项目（40532012,40373011）和中国科学院知识创新工程项目（KZCX-SW-141）联合资助.致谢感谢张启锐研究员为此研究工作采集的样品,及李禾高级工程师的样品主成分化学分析工作.

收稿日期: 2006-02-10

修回日期: 2006-07-20

刊出日期: 2006-09-30

Liantuo sandstones: sedimentary records under cold climate before the Nanhua big glaciations

FENG LianJun, CHU XueLei, ZHANG TongGang,HUANG Jing

- 1. Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China ;2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Received Date: 10 February 2006

Revised Date: 20 July 2006

Publish Date: 30 September 2006

摘要

摘要: 湖北宜昌地区出露的莲沱组中上部细屑岩的化学蚀变指数（CIA）介于60～70之间，表明是在寒冷干燥的气候条件下沉积的。比较莲沱组与板溪群中下部沉积岩的主化学成分和CIA值表明，板溪群源区遭受过强烈的化学风化，相应的古气候是温暖湿润的，而莲沱组源区化学风化弱，可见两者形成时的古气候环境明显不同。根据CIA值推测，地层层序上莲沱组位于板溪群的中上部。莲沱砂岩的CIA研究表明南华大冰期前全球气候已经从温暖湿润转变为寒冷干燥，CIA值继续降低预示着全球性的冰期到来，不久就发生了“雪球地球”事件。
- 新元古代 /
- 扬子地台 /
- 莲沱组 /
- 化学蚀变指数 /
- 寒冷气候 /
- 古城（江口）冰期

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莲沱砂岩——南华大冰期前气候转冷的沉积记录

Liantuo sandstones: sedimentary records under cold climate before the Nanhua big glaciations

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