Complex Indian subduction style with slab fragmentation beneath the Eastern Himalayan Syntaxis revealed by teleseismic P-wave tomography
Complex Indian subduction style with slab fragmentation beneath the Eastern Himalayan Syntaxis revealed by teleseismic P-wave tomography
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远震 P 波断层扫描揭示了东喜马拉雅构造线下方复杂的印度俯冲样式和板片破碎
DOI：
10.1016/j.tecto.2015.11.012
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发表时间：
2016-01
期刊：
影响因子：
2.9
通讯作者：
Xu Lehong
中科院分区：
文献类型：
--
作者：
Peng Miao;Jiang Mei;Li Zhong-Hai;Xu Zhiqin;Zhu Lupei;Chan Winston;Chen Youlin;Wang Youxue;Yu Changqing;Lei Jianshe;Zhang Lishu;Li Qingqing;Xu Lehong
喜马拉雅造山带东缘南迦巴瓦变质带快速隆升，雅鲁藏布江缝合带发生明显弯曲。东喜马拉雅构造结（EHS）的形成机制和动力学至今仍有争议。为了更好地了解EHS下方的深层结构，我们在Namche Barwa山周围部署了35个宽带地震站。将这些数据与现有的数据集进行了3-D EQUIPMENT P波断层扫描。结果表明，复杂的深部结构和显着的印度俯冲样式在喜马拉雅山东部。在青藏高原西部地区，印度板块平缓地俯冲到西藏南部，并可能延伸到班公湖-怒江缝合带。与此相反，（北）东陡峭的俯冲发生在东部地区的EHS。对比俯冲风格的结果撕裂和破碎的印度岩石圈之间的平坦和陡峭的俯冲板片下的EHS。因此，热的软流圈地幔可能通过板片窗口上升，这可能进一步导致Namche Barwa的快速隆升和EHS的形成。俯冲/碰撞模式的横向变化和板片撕裂引起的软流圈地幔上涌与特提斯造山带的Hellenide和Anatlanide域中观察到的相似。
On the eastern margin of the Himalayan orogenic belt, the rapid uplift of the Namche Barwa metamorphic terrane and significant bending of the Yarlung Zangbo suture zone occur. The formation mechanism and dynamics of the Eastern Himalaya Syntaxis (EHS) is still debated. In order to better understand the deep structures beneath the EHS, we deployed 35 broadband seismic stations around the Namche Barwa Mountain. The data were integrated with existing datasets for a 3-D teleseismic P-wave tomography. The results demonstrate complex deep structures and significantly contrasting Indian subduction styles in the eastern Himalaya. In the western region of the EHS, the Indian slab flatly subducts under southern Tibet and might extend to the Bangong-Nujiang Suture. In contrast, a (north)eastward steep subduction occurred in the eastern region of EHS. The contrasting subduction styles result in tearing and fragmentation of the Indian lithosphere between the flat and steep subducting slabs beneath the EHS. Consequently, the hot asthenospheric mantle may rise through the slab window, which might further lead to the rapid uplift of Namche Barwa and the formation of EHS. The lateral variation in subduction/collision mode and slab tearing induced asthenospheric mantle upwelling is similar to that observed in the Hellenide and Anatolide domains of the Tethyan orogen.
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影响因子：
3.3
作者：
F. Qin;Yi Luo;K. Olsen;W. Cai;G. Schuster
通讯作者：
F. Qin;Yi Luo;K. Olsen;W. Cai;G. Schuster
影响因子：
2.9
作者：
L. Jolivet;C. Faccenna;B. Huet;L. Labrousse;L. Pourhiet;O. Lacombe;E. Lecomte;E. Burov;Y. Denèle
通讯作者：
L. Jolivet;C. Faccenna;B. Huet;L. Labrousse;L. Pourhiet;O. Lacombe;E. Lecomte;E. Burov;Y. Denèle
影响因子：
3.3
作者：
S. Cao;S. Greenhalgh
通讯作者：
S. Cao;S. Greenhalgh
喜马拉雅东部南迦巴瓦构造的运动学和动力学：来自变形、结构和地质年代学的约束
影响因子：
6.1
作者：
Cai, Zhihui;Zeng, Lingsen;Geng, Quanru;Cao, Hui
通讯作者：
Cao, Hui
影响因子：
56.9
作者：
Nabelek, John;Hetenyi, Gyoergy;Huang, Bor-Shouh
通讯作者：
Huang, Bor-Shouh