气候变化领域集成服务门户(CCPortal): Crustal and Upper Mantle Attenuation Structure Beneath the Southeastern Tibetan Plateau and Its Implications on Plateau Outgrowth

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DOI	10.1029/2023JB026977
	Crustal and Upper Mantle Attenuation Structure Beneath the Southeastern Tibetan Plateau and Its Implications on Plateau Outgrowth
	Liu, Hanlin; Pei, Shunping; Liu, Wei; Xue, Xiaotian; Li, Jiawei; Hua, Qian; Li, Lei
发表日期	2024
ISSN	2169-9313
EISSN	2169-9356
卷号	129 期号:2
英文摘要	The eastern Tibetan Plateau (TP) is crucial to the exploration of plateau outgrowth mechanisms. Teleseismic attenuation may provide constraints on anelasticity in the lithosphere-asthenosphere system and may therefore improve the understanding of plateau outgrowth and material extrusion. This study use dense array data across the eastern TP to measure relative attenuation from teleseismic P-wave phases. These observations are then used to invert a 2D relative attenuation map and a 3D Qp(-1) model. Weak attenuation is observed beneath the Sichuan Basin and most of the Dianzhong Block at depths of both 0-100 km and 100-200 km (Qp(-1) < 0.003). Strong attenuation is observed beneath the eastern TP and southwestern Dianzhong Block at depths of 0-100 km (Qp(-1) similar to 0.01-0.13), but underneath the eastern TP only at depths of 100-200 km (Qp(-1) similar to 0.013-0.015). These results suggest a cratonic lithosphere underneath the Dianzhong Block similar to that beneath the Sichuan Basin. We assume that this is the cooled lithosphere remnant of the Permian Emeishan plume. In contrast, strong attenuation beneath the eastern TP would indicate a thick lower crust and asthenosphere with intense heating. The boundary between strong and weak attenuation lies close to the Longmenshan-Xiaojinhe faults. We infer that the materials extruded eastward from the eastern TP cross this boundary into the southwestern Dianzhong Block in the lower crust, but stop at this boundary in the asthenosphere.
英文关键词	EASTERN TIBET; VELOCITY STRUCTURE; CONTINENTAL CHINA; WAVE TOMOGRAPHY; CENTRAL-ASIA; LITHOSPHERE; DEFORMATION; FLOW; CONSTRAINTS; ANISOTROPY
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001154399700001
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283856
作者单位	Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS
推荐引用方式 GB/T 7714	Liu, Hanlin,Pei, Shunping,Liu, Wei,et al. Crustal and Upper Mantle Attenuation Structure Beneath the Southeastern Tibetan Plateau and Its Implications on Plateau Outgrowth[J]. 中国科学院青藏高原研究所,2024,129(2).
APA	Liu, Hanlin.,Pei, Shunping.,Liu, Wei.,Xue, Xiaotian.,Li, Jiawei.,...&Li, Lei.(2024).Crustal and Upper Mantle Attenuation Structure Beneath the Southeastern Tibetan Plateau and Its Implications on Plateau Outgrowth.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,129(2).
MLA	Liu, Hanlin,et al."Crustal and Upper Mantle Attenuation Structure Beneath the Southeastern Tibetan Plateau and Its Implications on Plateau Outgrowth".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 129.2(2024).