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(U-Th)/He年龄约束下的塔里木盆地早古生代构造-热演化

, PP. 1669-1683

Keywords: (U-Th)/He年龄,构造-热演化,塔里木盆地,磷灰石裂变径迹,等效镜质体反射率(VRo)

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Abstract:

?塔里木盆地早古生代碳酸盐岩沉积时期的热历史由于缺乏有效的古温标进行热史恢复,一直是困扰该区下古生界烃源岩演化研究的难题.磷灰石和锆石的(U-Th)/He热定年技术是近年来用于沉积盆地热史研究的新技术,可以用来揭示地层的构造抬升和热历史.本文利用塔里木盆地典型井中古生界层系的古温标来恢复古生代的热史.这些井在海西期长期隆升、遭受强烈的剥蚀、后期埋藏深度较小,因而古生界层系中的古温标可以保留原始热信息,从而反映古生代的温度状况.本文通过对这些钻井样品进行磷灰石和锆石(U-Th)/He年龄测试,并结合磷灰石裂变径迹和等效镜质体反射率等古温标,综合模拟计算了塔里木盆地不同构造单元的KQ1和T1井早古生代的构造-热演化历史.模拟结果表明,塔里木盆地塔东北和巴楚隆起区古生代热演化存在差异.巴楚隆起区T1井在寒武纪末期的古地温梯度仅为28~30℃/km,奥陶纪的地温梯度增高至30~33℃/km之间,志留-泥盆纪地温梯度为31~34℃/km;塔东北的KQ1井区奥陶纪的地温梯度可达35℃/km,志留-泥盆纪地温梯度为32~35℃/km.因此,(U-Th)/He年龄结合其他古温标综合模拟的方法可以很好地揭示沉积盆地的热历史,特别是该方法为塔里木盆地早古生代的热史恢复提供了新的途径.

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