气候变化领域集成服务门户(CCPortal): Variable Depths of Magma Genesis in the North China Craton and Central Asian Orogenic Belt Inferred From Teleseismic P Wave Attenuation

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DOI	10.1029/2021JB022439
	Variable Depths of Magma Genesis in the North China Craton and Central Asian Orogenic Belt Inferred From Teleseismic P Wave Attenuation
	Liu, Hanlin; Byrnes, Joseph S.; Bezada, Maximiliano; Wu, Qingju; Pei, Shunping; He, Jing
通讯作者	Liu, HL ; Wu, QJ (通讯作者)
发表日期	2022
ISSN	2169-9313
EISSN	2169-9356
卷号	127 期号:3
英文摘要	Eastern Asia is a prime location for the study of intracontinental tectono-magmatic activity. For instance, the origin of widespread intraplate volcanism has been one of the most debated aspects of East Asian geological activity. Measurements of attenuation of teleseismic phases may provide additional constraints on the source regions of volcanism by sampling the upper mantle. This study uses data from three seismic arrays to constrain lateral variations in teleseismic P wave attenuation beneath the Central Asian Orogenic Belt and the North China Craton. We invert relative observations of attenuation for a 2-D map of variations in attenuation along with data and model uncertainties by applying a Hierarchical Bayesian method. As expected, low attenuation is observed beneath the Ordos block. High attenuation is observed beneath most of the volcanoes (e.g., the Middle Gobi volcano, the Bus Obo volcano, and the Datong volcano) in the study area, and estimated asthenospheric Qp values span from 95 to 200. These values are within the range of globally average asthenosphere. We infer that these volcanoes may tap melt from ambient asthenosphere and occur where the lithosphere is thin, which is consistent with previous petrologic studies. More complex mantle drivers of volcanism are not rejected but are not needed to explain eruptions in this area. In contrast, at the Xilinhot-Abaga volcanic site, the observed low attenuation (as low as beneath the Ordos block) excludes a typical shallow melting column. Fluids from the subducted Pacific plate may initiate the deep melting and would be consistent with petrological constraints.
关键词	UPPER-MANTLE BENEATH EASTERN CHINA LITHOSPHERE BENEATH SEISMIC EVIDENCE CENTRAL MONGOLIA INNER-MONGOLIA CENOZOIC VOLCANISM VELOCITY STRUCTURE AMBIENT NOISE FLOW BENEATH
英文关键词	Central Asian Orogenic Belt; North China Craton; intraplate volcanism; seismic attenuation; lithosphere; asthenosphere
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000776510500050
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/260715
推荐引用方式 GB/T 7714	Liu, Hanlin,Byrnes, Joseph S.,Bezada, Maximiliano,et al. Variable Depths of Magma Genesis in the North China Craton and Central Asian Orogenic Belt Inferred From Teleseismic P Wave Attenuation[J]. 中国科学院青藏高原研究所,2022,127(3).
APA	Liu, Hanlin,Byrnes, Joseph S.,Bezada, Maximiliano,Wu, Qingju,Pei, Shunping,&He, Jing.(2022).Variable Depths of Magma Genesis in the North China Craton and Central Asian Orogenic Belt Inferred From Teleseismic P Wave Attenuation.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,127(3).
MLA	Liu, Hanlin,et al."Variable Depths of Magma Genesis in the North China Craton and Central Asian Orogenic Belt Inferred From Teleseismic P Wave Attenuation".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 127.3(2022).