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内蒙古巴彦查干湖白云石的成因及其环境意义

, PP. 1116-1120

Keywords: 湖泊沉积,全新世,白云石,方解石,干旱

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Abstract:

对内蒙古南部巴彦查干湖12400cal.aB.P.以来的沉积物进行了X-衍射、扫描电镜、碳酸盐含量和自生碳酸盐氧同位素组成的研究。结果显示,沉积物中碳酸盐含量较高,6000cal.aB.P.以前为方解石,之后白云石开始出现,4800cal.aB.P.以来代替方解石成为主要的碳酸盐矿物。方解石的形态为细长的结晶棱柱体和薄片状,白云石颗粒的形态均为小球粒状,这些形态特征表明方解石和白云石是快速沉淀形成的。白云石的形态和大小与澳大利亚Coorong等地区微生物成因的白云石非常相似,表明巴彦查干湖白云石的形成可能与微生物活动有关。白云石在6000cal.aB.P.的出现是湖水咸化的直接证据,表明气候变干,这一结果与碳酸盐氧同位素和孢粉记录一致。

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