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甘肃天水地区中新世古土壤的微形态特征及其古环境意义

ISSN号：0564-3929
期刊名称：《土壤学报》
时间：0
分类：P934[天文地球—自然地理学] P512.2[天文地球—地质学]
作者机构：[1]兰州大学西部环境教育部重点实验室和资源环境学院,兰州730000
相关基金：国家重点基础研究发展计划（973计划）项目（2005CB422001）和国家自然科学基金项目（40721061,90211013）联合资助感谢中国科学院青藏高原研究所方小敏教授的指导和有益的建议.

作者：潘美慧[1], 宋春晖[1], 李吉均[1], 张军[1], 张平[1], 惠争闯[1]

关键词：天水地区, 古土壤, 微形态, 古环境, Tianshui region, Palaeosol, Micromorphology, Paleoenvironment

中文摘要：

通过对甘肃天水地区中新世古土壤（孙家剖面的第17～20层古土壤、下山剖面的第79～82层古土壤）微形态、粒度、碳酸钙含量、Rb／Sr、CIW、磁化率和色度指标的综合分析，揭示出该区中新世古土壤发育强度普遍高于当地现代土壤，其中早中新世中晚期古土壤发育程度相对较弱，古土壤类型为森林一森林草原型褐土一碳酸盐褐土，成壤时期气候为湿润一半湿润，指示亚洲季风可能在早中新世中晚期已经出现，强度较弱，但仍高于现代当地季风强度；中中新世古土壤发育程度强，古土壤类型为森林淋溶型褐土至棕壤，成壤时期气候温暖湿润，说明中中新世夏季风可能已很强盛，并且明显高于现在当地季风强度。

英文摘要：

Comprehensive analysis of the Miocene palaeosol in Qin＇ an area, Tianshui, Gansu, covering micromorphology, particle size, of CaCO3 content, Rb/Sr, CIW, magnetic susceptibility and chroma, revealed the palaeosol was more developed than the modern soil in the region, and of the soils, however, the palaeosol in the middle and late period of the early Miocene epoch was relatively lower in development degree. The soil is Cinnamon soil-Carbonating Cinnamon soil formed in humid/semi-humid forest/forest-steppe environment, suggesting that monsoon already appeared in Asia as early as that period, with intensity, though quite weak, still quite stronger than the modern one. The palaeosol of the middle Miocene was stronger in development degree, and is Cinnamon soil to brown soil formed in warm and humid climate, suggesting that the monsoon prevailed in Asia in that period and was much stronger than the modern ones.