地质学报2011，Vol.85Issue(3)：433-444,12.
柴达木盆地大浪滩地区表层芒硝的形成时代及环境意义
Forming Age of Surface Mirabilite in Dalangtan, Qaidam Basin and its Environmental Significance
摘要
Abstract
Based on two field survey in the Dalangtan area of Qaidam Basin, many outcrops of mirabilite and carbonate clay interlayers were found in Xiaoliangshan. The well D26 section was selected for research in this study. The comparative salinology study shows that mirabilite is a typical cold saline mineral and carbonate clay and gypsum is indicative of relative cool and semiarid conditions. Using mineralogical identification of mirabilite and carbonate clay interbeds, gypsum U-Th datings, and carbon and oxygen isotopic analysis of carbonate clay, this study firstly reveals that the Dalangtan region underwent five climate stages around penultimate glaciation (MIS 6): relative cool-semiarid stage (＞195.1 ka BP),frigid-arid stage (195.1 ～ 169.9 ka BP), relative cool-semiarid stage (about 169.9 ka BP), chilly-cold fluctuating stage (169.9 ka BP ～ 118 ka BP), and relative cool-semiarid stage (118 ka BP). Comparative study with loess section and marine oxygen isotope and regional research data suggests that since Middle and Late Pleistocene,the Dalangtan region was not only uplifted by activities of regional geology, but also response to global climate change.关键词
柴达木盆地/大浪滩/小梁山/芒硝-碳酸盐粘土互层/倒数第二次冰期(MIS6)/气候变化Key words
Qaidam Basin/ Dalangtan/ Xiaoliangshan/ Mirabilite and carbonate clay interbeds/Penultimate glaciation (MIS 6)/ Climate change引用本文复制引用
马妮娜,郑绵平,马志邦,陈文西,孔凡晶,施林峰..柴达木盆地大浪滩地区表层芒硝的形成时代及环境意义[J].地质学报,2011,85(3):433-444,12.基金项目
本文为矿产资源研究所基本科研业务费(编号K0916)和中国地质调查局项目(编号1212010511901、121201018057)资助的成果. （编号K0916）
