巴丹吉林沙漠东南缘砂楔年代及其环境意义
发布时间：2019-05-22 12:21
【摘要】：巴丹吉林沙漠东南缘新近发现的多处砂楔群和融冻褶皱,分别形成于砂砾石层和湖相沉积地层中,楔内充填物的光释光年龄证明其是末次冰期和晚冰期的产物.巴丹吉林沙漠在末次冰期和晚冰期时处于多年冻土带,年平均气温约为-3~-6℃,较现在降温约12~15℃.其时,整个阿拉善高原与纬度多年冻土带和青藏高原冻土区相连接,沙漠腹地及周边的沙丘应处于冻土状态,沙丘的移动和风沙地貌发育均会受到影响.在冷期,巴丹吉林沙漠很有可能相当于冰冻圈气候,前人关于中国北方沙漠非冻土区的认识值得商榷.
[Abstract]:Several sand wedges and thawing folds have been newly discovered in the southeast margin of Badan Jilin Desert, which are formed in gravel layer and lacustrine sedimentary strata, respectively. the photoluminescence age of the filling in the wedges proves that it is the product of the last ice age and the late ice age. The Badan Jilin Desert is in the permafrost zone during the last ice age and the late ice age, and the annual average temperature is about-3 鈮，
本文编号：2482934
[Abstract]:Several sand wedges and thawing folds have been newly discovered in the southeast margin of Badan Jilin Desert, which are formed in gravel layer and lacustrine sedimentary strata, respectively. the photoluminescence age of the filling in the wedges proves that it is the product of the last ice age and the late ice age. The Badan Jilin Desert is in the permafrost zone during the last ice age and the late ice age, and the annual average temperature is about-3 鈮，
本文编号：2482934
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