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Analysis of Soil Granularity at Dazhuka Country, Rikeze
Author(s): 
Pages: 80-85
Year: Issue:  5
Journal: JOURNAL OF ARID LAND RESOURCES AND ENVIRONMENT

Keyword:  风成黄土粒度环境变迁;
Abstract: 通过对西藏日喀则市大竹卡乡风成黄土剖面样品的粒度测试分析,划分出六个气候阶段,显示67.0±7.2kaB.P-10.4±1.6 kaB.P间经历了温暖湿润-干燥多风-温暖干燥-干燥多风-湿干偏湿-温暖湿润环境的变化.该地区的黄土是半干旱-半湿润气候条件下形成的砂黄土,粒度较黄土高原的黄土要粗,表明当时受行星风系及高原隆升的影响,冰期的温度整体较低,雅鲁藏布江中部流域受西南季风的影响减小,规模小的温暖湿润波动不能对气候产生影响.因此,本区地层中的记录信息较黄土高原简单,气候向干冷化发展.
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