| 古土壤:沉积环境和古气候变化的灵敏指针 |
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| 引用本文： | 陈留勤,刘鑫,李鹏程.古土壤:沉积环境和古气候变化的灵敏指针[J].沉积学报,2018,36(3):510-520. |
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| 作者姓名： | 陈留勤 刘鑫 李鹏程 |
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| 作者单位： | 1.东华理工大学省部共建核资源与环境国家重点实验室培育基地, 南昌 330013; |
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| 基金项目： | 国家自然科学基金项目(41602113)，东华理工大学省部共建核资源与环境国家重点实验室培育基地开放基金(NRE1605)，刘宝珺地学青年科学基金暨山东省沉积成矿作用与沉积矿产重点实验室(山东科技大学)开放基金( DMSM2017011)National Nat-ural Science Foundation of China |
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| 摘 要： | 古土壤是古代沉积环境和气候变化的灵敏记录者，可以为深刻认识地球演化历史中的重要地质事件提供有效信息，并成为当前沉积学领域的研究热点之一。国外古土壤研究已经涉及到太古代以来的几乎所有沉积地层，而国内古土壤的研究仍以第四纪地层为主，对前第四纪漫长地质时期地层记录中的古土壤研究较少。基于古土壤的识别特征及其埋藏后发生的可能变化，分析了古土壤在沉积环境解释和地层划分对比中的作用。其中，古土壤钙积层发育深度、元素地球化学、成土碳酸盐岩稳定同位素等对于合理评价成土作用过程、划分成土相及定量恢复古气候（年均降水量、年均气温和pCO2）等方面的研究发展迅速，不同估算古气候参数的经验公式都有明显的适用性特点。近年来，国内学者对松辽、四川、胶莱盆地等的白垩系古土壤进行了很多调查研究，并取得了较好的研究成果。而包括江西、广东、浙江等在内的中国东南地区白垩系陆相红层研究结果显示，这些地层含有丰富的古土壤，总体为地表干旱氧化条件下形成的红色古土壤序列。通过对国际古土壤研究动态的综述，以期引起国内更多沉积学工作者关注前第四纪地层记录中的古土壤，为更好地认识古代地球环境变化做出更大贡献。
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| 关 键 词： | 古土壤 古气候 沉积环境 冲积地层 定量古气候重建 |
| 收稿时间： | 2017-07-13 |
Paleosols: Sensitive Indicators of Depositional Environments and Paleocli-mate |
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| CHEN LiuQin,LIU Xin,LI PengCheng.Paleosols: Sensitive Indicators of Depositional Environments and Paleocli-mate[J].Acta Sedimentologica Sinica,2018,36(3):510-520. |
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| Authors: | CHEN LiuQin LIU Xin LI PengCheng |
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| Institution: | 1.State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China;2.Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;3.School of Earth Sciences, East China University of Technology, Nanchang 330013, China |
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| Abstract: | Paleosols are sensitive to indicate depositional environments and paleoclimate changes. At the present days, the studies of paleoenvironment and paleoclimate based on paleosols become one of the hot scientific points in sedimentology. It is an effective and valuable approach by using paleosols to untangle major geological events during the evolution history of our planet. Many abroad studies on paleosols have dealt with almost all sedimentary records from the Archean to Quaternary Period. In contrast, some domestic work has been exclusively conducted on the pal-eosols of the Quaternary Period. However, few works have been done on the paleosols of the very long pre-Quaternary time in China. On the basis of a brief introduction of diagnostic features and burial alteration of paleosols, this paper analyzes the roles of paleosols in the depositional environment interpretation, and stratigraphic division and correlation. Afterwards, the emphases are put on estimation of soil-forming processes, pedo-types, and quantitative paleoclimate reconstruction (MAP, MAT, and pCO2) based on proxies including depth of Bk horizon, elemental geochemistry, pedogenic carbonate isotopes. In addition, the applicability of different empirical formula for paleoclimatic estimation is also summarized and discussed. In recent years, much progress has been made on the paleosols from the continental Cretaceous clastic rocks in the Songliao, Sichuan, and Jiaolai basins in China. Moreover, abundant paleosols are ob-served within the Cretaceous alluvial redbeds of Jiangxi, Guangdong, and Zhejiang provinces in SE China, and they were interpreted as paleosol sequences formed in the arid and oxidizing depositional environments. The goal of this synthesis is to attract attention from more domestic sedimentologists to involve in the research of paleosols preserved in the pre-Quaternary sedimentary strata to achieve more contribution for ancient environmental changes. |
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