宜昌庙河钙结岩记录的古环境变化

肖尚斌; 常宏; 刘卫国; 魏宝华

doi:10.3724/SP.J.1140.2014.02045

宜昌庙河钙结岩记录的古环境变化

1. 三峡大学水利与环境学院, 宜昌 443002;
2. 中国科学院山地灾害与地表过程重点实验室, 成都 610041;
3. 中国地质调查局武汉地质调查中心, 武汉 430205;
4. 中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 西安 710075

基金项目:

中国博士后特别资助基金项目(200801440)；中国博士后基金项目(20070421132)；湖北省青年杰出人才基金项目(2008CDB382)；中国科学院山地灾害与地表过程重点实验室开放基金项目

详细信息

作者简介:
肖尚斌(1970-),男,教授,博士后,主要从事沉积学相关研究,E-mail:shangbinx@163.com

中图分类号: P531
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- 文章访问数: 1650
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出版历程
- 收稿日期: 2013-07-11
- 修回日期: 2013-09-24

PALAEOENVIRONMENTAL CHANGES RECORDED BY THE CALCRETES AT MIAOHE, YICHANG

1. China Three Gorges University, Yichang 443002, China;
2. Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountein Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041;
3. Wuhan Center of the China Geological Survey, Wuhan 443003, China;
4. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China

摘要

摘要: 对位于三峡地区黄陵背斜核部的宜昌庙河钙结岩体进行了沉积学、岩石学分析,识别出土壤钙结岩和地下水钙结岩。对土壤钙结岩进行了胶结物的分离、ESR年龄测试和碳氧稳定同位素分析,结果表明,庙河土壤钙结岩中方解石胶结物的δ¹³C值相对围岩而言明显偏负,多数样品δ¹⁸O值则呈不同程度偏正的趋势。土壤钙结岩主要形成于冰期,计算表明它们形成时期的古气温多为8~12℃,年均降雨量多为760~770 mm,C₄植物占约84%的绝对优势。由于钙结岩的形成过程涉及到诸多影响碳酸盐化学过程和相应土壤碳酸盐稳定同位素组成的因素,得出的认识可能存在一定程度的不确定性。
- 钙结岩 /
- 第四纪环境 /
- 碳氧稳定同位素 /
- 三峡
Abstract: Two types of calcrete at Miaohe, Yichan, i.e., pedogenic calcrete and groundwater calcrete were studied in this paper. Calcite cements were separated from the pedogenic calcrete for ESR dating and δ¹³C and δ¹⁸O analysis. δ¹³C values of calcite cements are obviously lighter than the host sediments, and δ¹⁸O values of calcite cements slightly heavier than those of the host sediments. It's inferred that the palaeotemperature was 8~12℃, the mean annual rainfall was 760~770 mm and C₄ plants accounted for~84% when these calcretes were formed in the glacial stages.
- calcrete /
- Quaternary environment /
- δ¹³C and δ¹⁸O /
- the Three Gorges

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