摘要
为揭示柴达木盆地晚更新世期间的气候环境状况及其与湖泊沉积物中黏土矿物特征之间的耦合关系，本文利用X射线衍射（XRD）法对位于柴达木盆地察尔汗盐湖别勒滩区段的ISL1A钻孔剖面的黏土矿物类型、相对含量及伊利石结晶度的变化进行了分析。结果表明，沉积物中黏土矿物组合以伊利石为主，次为绿泥石、伊/蒙混层矿物、高岭石和蒙脱石。对黏土矿物相对含量变化特征的对比分析研究表明，柴达木盆地察尔汗盐湖成盐阶段伊利石和高岭石的相对含量小于未成盐阶段，而绿泥石相对含量大于末成盐阶段；晚更新世气候在84～71kaB．P．与65～47kaB．P．期间温暖湿润，93～84kaB．P．和71～65kaB．P．相对干冷，成盐期（47～9kaB．P．）气候经历了干旱-湿润干旱的旋回变化。
In order to reveal climatic and environmental condition of the Qaidam Basin during the late Pleistocene and its coupling relation with clay minerals in the lake sediment, the contents of clay minerals and crystallinity of illite of the ISL1A core, located in the Bieletan zone of the Qarhan saline lake, were analyzed by XRI）. The results show that the clay minerals are dominated by illite, followed by chlorite, illite/semeetite, kaolinite, and smectite. The changes of the clay mineral compositions show that the relative contents of illite and kaolinite are lower in salt stage, contrary to chlorite; the paleoclimate of the Qarhan saline lake since the late Pleistocene remarkably changed, warm and humid during 84--71 ka B.P. and 65--47 ka B. P. , cold and arid during 93--84 ka B.P. and 71--65 ka B.P. The climate experienced an arid humid-arid change cycle in salt stage （47--9 ka B. P. ）.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2014年第1期49-54,共6页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家重点基础研究发展计划项目(2011CB403004)
中国科学院知识创新工程重要方向项目(KZCXZ-YW-344)
