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矿床地质  2010 

罗布泊盐湖化学沉积序列及其控制因素

Keywords: 地球化学,盐湖,化学沉积,沉积序列,析盐序列,罗布泊,新疆

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Abstract:

罗布泊位于塔里木盆地的东部,是世界最大的第四纪干盐湖之一。罗布泊盐湖化学沉积序列总体简单,即为石膏—钙芒硝(巨厚)—石盐(很薄),但细节变化则很复杂,在钙芒硝阶段和石盐阶段出现了很多含钾盐矿物的薄层,按时代从老到新,可划分出9个区段。罗布泊化学沉积序列除了与江汉盆地第三纪古盐湖有一定的相似性之外,与其他陆相、非海相和海相蒸发沉积序列有明显的差异,这可能与该地区的气候变化、物源背景及构造环境等有关。这种特殊的化学沉积序列应该是全球气候变化与大地构造运动在盐湖沉积中的响应,气候持续干化与补给变化的耦合,是造成罗布泊盐湖特殊的化学沉积序列的机制。

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