叶荷;张克信;陈奋宁;陈锐明;徐亚东;季军良;

• 1:中国地质大学研究生院
• 2:中国地质大学生物地质与环境地质教育部重点实验室
• 3:广东省地质局七五六地质大队

摘要(Abstract)：

柯克亚剖面位于青藏高原西北缘新疆叶城县柯克亚乡,出露的地层由老到新为乌恰群、阿图什组和西域组,总厚度为2 217.9 m。在野外地层剖面详细实测与沉积相研究的基础上,系统采集了柯克亚剖面上8~3.85 Ma间沉积地层的地球化学样品并进行了常量和微量元素的测试和分析。剖面沉积物中元素平均值与上部陆壳(UCC)元素平均质量分数比揭示了研究区在8~3.85 Ma期间总体较为干旱寒冷的气候环境特征。在此基础上,结合具有较好指示作用的元素变化特征,根据CIA、w(CaO)/w(Sr)、w(Rb)/w(Sr)、w(CaO)/w(MgO)比值的变化将研究区的古气候变化分为3个阶段:剖面自下向上0~222 m(乌恰群第1~7层,年龄为8~7.3 Ma)为冷干气候;222~419 m(乌恰群第8~15层,年龄为7.3~6.6 Ma)为暖湿—冷干交替的气候;419~1 665 m(乌恰群第16层~阿图什组第24层,年龄为6.6~3.85 Ma)气候更为冷干。根据古气候研究结果推测青藏高原在8 Ma前已经隆升到了一定的高度,阻挡了来自印度洋的夏季风的北上,导致塔里木盆地干旱化。约6.6 Ma前气候的进一步变干可能与青藏高原的进一步隆升和来自西伯利亚的冬季风的进一步加强有关。

关键词(KeyWords)： 叶城;晚新生代;常量元素;微量元素;气候演化

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局国家青藏专项(1212010610103);; 国家自然科学基金项目(40621002;40830212)

作者(Author): 叶荷;张克信;陈奋宁;陈锐明;徐亚东;季军良;

Email:

DOI:

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