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毛乌素沙漠东南缘全新世剖面光释光年代及古气候意义
Authors
孙璐
岳乐平
+3 more
徐永
杨利荣
马冀
Publication date
1 January 2011
Publisher
Abstract
在毛乌素沙漠东南缘锦界地区发现的具有3层深棕色至黑色古土壤的全新世剖面,记录了至少3次大型沙地固定与活化的交替演化.在锦界剖面厚约5m的全新世地层中采集了10个光释光样品,利用石英光释光测年单片再生法(SAR),建立了锦界剖面全新世(>7.5-0.2ka)年代格架.结合粒度、磁化率气候变化代用指标和光释光年龄序列,得到毛乌素沙漠全新世时期沙漠演化和气候变化记录,7.5ka之前,地表植被稀疏,为气候干旱时期;7.5-3.9ka时段毛乌素经历了一个湿润成壤期,地表植被发育厚层黑色古土壤;约3.9-2.9ka为沙丘活跃期;2.9-1.7ka时段为较弱成壤期,发育深棕色古土壤;1.7ka以来,气候波动频繁,气候环境整体较之前干旱,1.0~0.5ka经历短暂温暖期,200年左右气候再次趋于干旱,但近1.0ka气候记录可能受到了人类活动干扰.随着冬夏季风的相互对峙、占主导时期不同,毛乌素沙漠响应气候的变化也随之扩张收缩变迁.同时,锦界剖面记录的毛乌索沙漠气候变化与全球变化的干旱、寒冷事件以及温暖事件可以对应
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Last time updated on 03/02/2019