临夏盆地黑林顶剖面11.6～5.0Ma碳酸钙的变化机制  

Changing Mechanisms of Calcium Carbonate in Heilinding Section of Linxia Basin from 11.6 to 5.0 Ma

作　　者：张启波[1] 闫晓丽[1] 苗运法[2] 方小敏[1,2] 王亚东[1] 张涛[1] 昝金波[1] 杨一搏[2] 迟云平[1] 

机构地区：[1]兰州大学资源环境学院西部环境教育部重点实验室,甘肃兰州730000 [2]中国科学院青藏高原研究所盆地与资源环境研究中心,北京100085

出　　处：《安徽农业科学》2010年第9期4772-4774,共3页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金项目(40771214;40872029);中国科学院知识创新工程重要方向项目(kzcx2-yw-104)

摘　　要：CaCO3含量可以明确指示黄土-古土壤层序的发生及其气候变化,因而被称之为有效的气候代用指标之一。临夏盆地黑林顶剖面出露一套连续完整的晚新生代(11.6～5.0Ma)河湖相地层,对该套地层CaCO3含量进行测定,结果揭示,在11.6～8.6Ma,CaCO3含量基本保持相对稳定,平均含量为10.1%。从8.6Ma后,其含量明显减少,平均含量为8.4%。对该剖面磁化率和色度指标以及周边地区气候记录进行对比,认为CaCO3在8.6Ma时期的转变不能简单地运用气候变化进行解释,而很可能与青藏高原阶段性快速隆升带来的碎屑物质的大量快速沉积有关。As a good indication of the Loess-paleosol sequence＇s occurrence and climate changes,the calcium carbonate content is referred as an effective substitute indicator for climate and expends into other sedimentary types continuously. Heilinding Section of Linxia Basin appears a set of successive and integral lacustrine-fluvial strata of Late Cenozoic. Through the experimental measurement of calcium carbonate in this set of strata,It was found that the CaCO3 content is relatively stable and the average is 10.1%. While it decreases obiviously from 8.6 Ma and the average is 8.4%. Comparing with the magnetic susceptibility and chromatic indicators of this section and the climate records of surrounding areas,it is believed that the transition of calcium carbonate in the 8.6 Ma should not be simply explained as climate changes but is most probably related to quantity and rapid deposition of clast caused by the rapid stage uplift of the Tibetan Plateau.

关 键 词：临夏盆地 CACO3 变化机制 

分 类 号：S153.6[农业科学—土壤学]