红色风化壳地球化学特征及对古气候演变的响应——以辽南石槽剖面为例  

Geochemical Characteristics of Red Weathering Crust from Shicao Profile in Southern Liaoning Province and the Response of Paleoclimate Evolution

作　　者：魏东岚[1] 沈俊杰[1] 李永化[1] 

机构地区：[1]辽宁师范大学城市与环境学院

出　　处：《地理科学》2018年第2期307-313,共7页Scientia Geographica Sinica

基　　金：国家自然科学基金项目(41271093)资助~~

摘　　要：以辽南地区石槽剖面红色风化壳为研究对象,通过研究剖面的常量元素和地球化学指标,揭示剖面的地球化学特征,探讨剖面化学风化过程以及对古气候环境演变过程的响应。结果表明：石槽剖面红色风化壳中Ca元素重度亏损,其他常量元素均出现了相对富集;石槽剖面风化强度总体上低于南方红色风化壳,属于中等风化阶段;多个地球化学指标的垂向变化表明石槽剖面风化强度表现为风化很强-风化减弱-风化加强-风化较弱4个阶段的变化,指示辽南地区在石槽剖面发育期内古气候环境经历了湿热-暖湿-回暖-相对暖湿的演变过程。Based on analyzed the major elements contents and other geochemical parameters of the red weathering crust from the Shicao profile in the southern of Liaoning Province, the geochemical characteristics of the weathering process and paleoclimate evolution were discussed. The results showed that the major elements are mainly composed of Si O2, Al2 O3 and Fe2 O3. Compared to the bedrock, Ca has been leached out strongly, while other major elements relatively enriched in the red weathering crust of Shicao profile. In general, the intensity of chemical weathering in Shicao profile was lower than the red weathering crust from the southern China,which indicated a moderate chemical weathering intensity under warm and moist climate conditions. There are four stages of weathering process in the Shicao profile that can be assigned as intensely weathering, weakening weathering, intensifying weathering, and relatively weaker weathering. Since the chemical weathering intensity of the red crust is sensitive to climate change, the geochemical parameters can be used to reconstruct the paleoclimate environment. The paleoclimate of the southern of Liaoning Province, which in the weathering period of the Shicao profile, has undergone four stages. That is hot and humid, warm and wet, return warming, relatively warm and wet.

关 键 词：石槽剖面 红色风化壳 常量元素 化学风化 古气候 

分 类 号：K903[历史地理—人文地理学]