疏勒河冲积扇沉积物粒度特征及其古气候环境分析  

Grain-size Characteristics of Sediments from Shulehe Alluvial Fan and Analysis on Its Paleoclimatic Environment

作　　者：周叶[1] 张露[2] 

机构地区：[1]北京矿冶研究总院,北京100160 [2]中国科学院对地观测与数字地球科学中心,北京100094

出　　处：《科技通报》2014年第9期27-33,共7页Bulletin of Science and Technology

基　　金：国家自然科学基金项目(41001268)

摘　　要：通过对疏勒河冲积扇沉积物进行粒度测量试验,采用激光粒度分析仪得出沉积物粒度中值Mz变化范围和粒度分布特征概率累积曲线.结合研究区地质背景和沉积物元素测试结果进行分析,分析结果显示：（1）沉积物粒度中值Mz 变化范围为7.41～50. 06 μ m,其中粗粉砂含量最多,约占50%.（2）Sr、P元素含量和Rb/Sr 值较低,Sr/Cu比值介于1～10.通过分析结果,推断疏勒河冲积扇沉积物在形成过程中古气候总体趋于潮湿（阴冷）,风力作用强劲.研究结果对恢复疏勒河冲积扇地区的古气候环境演化历史有重要意义.In the test for grain size of sediments from Shulehe alluvial fan, Laser particle size analyzer isused to obtain the range of median grain diameter （Mz） and particle size distribution characteristicscurve. Combined with the geological background and element analysis of sediments from Shulehealluvial fan, The results show that （1） the range of median grain diameter （Mz） is 7.41～50. 06 μ m, withnearly 50% coarse silt. （2） the contents of element Sr、P and ratio Rb/Sr are relatively low, ratio Sr/Cu is1～10. So according to the result, it is inferred that the paleoclimatic environment during sedimentsforming was humid and cold, and the wind power was strong. The result is significant to the paleoclimaticenvironment evolving history of Shulehe alluvial fan.

关 键 词：疏勒河冲积扇 粒度特征 沉积物 古气候环境 

分 类 号：P534.63[天文地球—第四纪地质学]