【摘要】：巴丹吉林沙漠東南緣新近發(fā)現(xiàn)的多處砂楔群和融凍褶皺,分別形成于砂礫石層和湖相沉積地層中,楔內(nèi)充填物的光釋光年齡證明其是末次冰期和晚冰期的產(chǎn)物.巴丹吉林沙漠在末次冰期和晚冰期時(shí)處于多年凍土帶,年平均氣溫約為-3~-6℃,較現(xiàn)在降溫約12~15℃.其時(shí),整個(gè)阿拉善高原與緯度多年凍土帶和青藏高原凍土區(qū)相連接,沙漠腹地及周邊的沙丘應(yīng)處于凍土狀態(tài),沙丘的移動(dòng)和風(fēng)沙地貌發(fā)育均會(huì)受到影響.在冷期,巴丹吉林沙漠很有可能相當(dāng)于冰凍圈氣候,前人關(guān)于中國北方沙漠非凍土區(qū)的認(rèn)識(shí)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，

本文編號(hào)：2482934