DOI: 10.1016/j.tecto.2020.228480
论文题名: Detailed structure of mantle transition zone beneath southeastern China and its implications for thinning of the continental lithosphere
作者: Han R. ; Li Q. ; Huang R. ; Zhang H.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 789 语种: 英语
中文关键词: Flat-slab subduction
; Mantle transition zone (MTZ)
; Receiver functions
; Southeastern China
; Temperature anomalies
; Water content
英文关键词: Lithology
; Seismic waves
; Common-conversion points
; Continental lithosphere
; Estimation of temperatures
; Flat-slab subductions
; Lithospheric extension
; Lithospheric thinning
; Mantle transition zone
; Structural characteristics
; Temperature
; continental lithosphere
; extensional tectonics
; lithospheric structure
; mantle discontinuity
; mantle source
; P-wave
; seismic wave
; structural geology
; three-dimensional modeling
; transition zone
; water content
; China
英文摘要: This paper presents a new study on 3-D structure, temperature and water content estimation of the mantle transition zone (MTZ) by P-wave receiver functions common conversion point (CCP) method on broadband array with 267 temporary stations and 203 permanent stations in southeastern China. The results show different structural characteristics of the MTZ to the north and south of the 29°N line. In the northern part, the 660-km discontinuity is generally deeper than globe models, and there are two independent local depressions with characteristics of high velocity, low temperature, and water shortage. We interpret them as two previous subducting plates stagnated in MTZ, possibly related to two separate subduction events at different times. While in the southern part, the 410-km discontinuity is locally depressed, resulting in thinning of the MTZ. Particularly, in the Cathaysian Block south of the 29°N line, based on the MTZ structure and the estimation of temperature and water content, we conside dehydration of the MTZ as one of the important mechanisms of lithospheric thinning through interaction with the asthenosphere. We then propose a dynamic model that combines paleo-Pacific flat-slab subduction and upper mantle convection to explain the lithospheric extension and thinning, magmatic rock distribution, weak seismic activity and basin-and-range geomorphology. This model differs from that north of the 29°N line in the North China Block. © 2020 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170599
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China; Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, 430074, China
Recommended Citation:
Han R.,Li Q.,Huang R.,et al. Detailed structure of mantle transition zone beneath southeastern China and its implications for thinning of the continental lithosphere[J]. Tectonophysics,2020-01-01,789