Paleomagnetism and U-Pb Geochronology of Early Cretaceous Volcanic Rocks from the Qiangtang Block, Tibetan Plateau: Implications for the Qiangtang-Lhasa Collision
Paleomagnetism and U-Pb Geochronology of Early Cretaceous Volcanic Rocks from the Qiangtang Block, Tibetan Plateau: Implications for the Qiangtang-Lhasa Collision
复制标题
青藏高原羌塘地块早白垩世火山岩的古地磁和U-Pb年代学：对羌塘-拉萨碰撞的启示
DOI：
10.1016/j.tecto.2020.228500
复制
发表时间：
2020-08
期刊：
影响因子：
2.9
通讯作者：
Yang Zhenyu
中科院分区：
文献类型：
--
作者：
Cao Yong;Sun Zhiming;Li Haibing;Ye Xiaozhou;Pan Jiawei;Liu Dongliang;Zhang Lei;Wu Bailing;Cao Xinwen;Liu Chenguang;Yang Zhenyu
羌塘地块与拉萨地块的碰撞是理解青藏高原中部地球动力学的一个关键因素。然而，羌塘-拉萨碰撞的过程仍然存在争议。研究羌塘-拉萨碰撞历史的一个直接途径是确定羌塘和拉萨地块在侏罗纪-白垩纪的古纬度位置演化。本文对羌塘地块西部早白垩世火山岩进行了古地磁和年代学研究。分步热退磁成功地隔离了样品的高温特征方向。16个采样点的倾斜校正平均方向为Ds = 60.9°，Is= 45.9°，θ 95= 4.4°，表明羌塘地块早白垩世（~120-115 Ma）位于27.6 ± 5.0°N（参考点：32.9°N，83.5°E）。我们的新数据结合以前可靠的白垩纪拉萨地块的古地磁结果表明，羌塘和拉萨地块的西部之间的碰撞可能发生在晚于115 Ma。班公湖-怒江特提斯洋西段在120-115 Ma时的长度约为825 ± 600 km（纬度7.5° ± 5.5°）。
The collision between the Qiangtang and Lhasa blocks is a critical factor in understanding the geodynamics of the central Tibetan Plateau. However, the process of the Qiangtang-Lhasa collision remains contentious. A direct way to study the history of the Qiangtang-Lhasa collision would be to determine the evolution of the paleolatitude positions of the Qiangtang and Lhasa blocks during the Jurassic-Cretaceous. In this study, we present a combined paleomagnetic and geochronological study of the Early Cretaceous volcanic rocks dated at ~120–115 Ma in the western Qiangtang block. Stepwise thermal demagnetization succeeded in isolating the high-temperature characteristic directions of the samples. The tilt-corrected mean direction of the 16 sampling sites wasDs= 60.9°,Is= 45.9° withɑ95= 4.4°, which indicates that the Qiangtang block was situated at 27.6 ± 5.0°N during the Early Cretaceous (~120–115 Ma) (reference point: 32.9°N, 83.5°E). Our new data combined with previous reliable Cretaceous paleomagnetic results for the Lhasa block indicate that the collision between the western parts of the Qiangtang and Lhasa blocks may occur later than 115 Ma. The extent of the western segment of the Bangong-Nujiang Tethys Ocean was ~825 ± 600 km (7.5° ± 5.5° in latitude) at 120–115 Ma.
登录
查看更多内容
影响因子：
2.8
作者：
Deenen, Martijn H. L.;Langereis, Cor G.;Biggin, Andrew J.
通讯作者：
Biggin, Andrew J.
DOI：
10.1002/2014jb011362
发表时间：
2014-10
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
--
作者：
Yiming Ma;Tianshui Yang;Zhenyu Yang;Shihong Zhang;Huaichun Wu;Haiyan Li;Huai-kun Li;Weiwei Chen-
通讯作者：
Yiming Ma;Tianshui Yang;Zhenyu Yang;Shihong Zhang;Huaichun Wu;Haiyan Li;Huai-kun Li;Weiwei Chen-
影响因子：
4.6
作者：
Bian W;Yang T;Ma Y;Jin J;Gao F;Zhang S;Wu H;Li H
通讯作者：
Li H
影响因子：
3
作者：
Yabo Tong;Zhenyu Yang;Liang Gao;Heng Wang;Xudong Zhang;Chunzhi An;Yingchao Xu;Z. Han
通讯作者：
Yabo Tong;Zhenyu Yang;Liang Gao;Heng Wang;Xudong Zhang;Chunzhi An;Yingchao Xu;Z. Han
影响因子：
5.2
作者：
J. Linder;S. Gilder
通讯作者：
J. Linder;S. Gilder