西藏羌塘盆地白垩纪中期构造事件的磷灰石裂变径迹证据

被引：47

作者：

王立成 ^{[1
]}

魏玉帅 ^{[2
,3
]}

机构：

[1] 中国地质科学院矿产资源研究所

[2] 生物地质和环境地质国家重点实验室

[3] 中国地质大学地球科学与资源学院

来源：

岩石学报 | 2013年 / 29卷 / 03期

关键词：

裂变径迹; 构造事件; 热历史; 白垩纪中期; 羌塘盆地;

D O I：

暂无

中图分类号：

P548 [区域构造地质学];

学科分类号：

070904 [构造地质学];

摘要：

拉萨与羌塘地块于白垩纪中期的碰撞造山对羌塘原型盆地的热体制和构造演化有着重要影响。运用磷灰石裂变径迹方法,对羌塘盆地隆鄂尼夏里组和托纳木雪山组砂岩分析表明,裂变径迹年龄集中在120～80Ma之间,表明在白垩纪中期,羌塘盆地普遍发生了一次构造抬升事件,该期构造事件的年龄与盆地内早白垩世的岩浆热事件、主要构造变形作用发生在晚白垩世以及雪山组和阿布山组角度不整合的时代(125～75Ma)较一致,是拉萨与羌塘地块碰撞造山事件的记录。热历史模拟表明,白垩纪中期构造事件对羌塘盆地南部和北部的热演化历史有着差异影响,羌塘盆地南部降温速率相对不大,抬升剥蚀厚度约1500m,而北部古地温迅速降温到近地表温度,抬升剥蚀厚度近4000m。这种差异抬升剥蚀可能与班公湖-怒江洋壳向南俯冲使得因拉萨地块构造负载而导致羌塘地块的挠曲有关。

引用

页码：1039 / 1047

页数：9

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