Detailed structure of mantle transition zone beneath southeastern China and its implications for thinning of the continental lithosphere
Detailed structure of mantle transition zone beneath southeastern China and its implications for thinning of the continental lithosphere
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中国东南部地幔过渡带的详细结构及其对大陆岩石圈减薄的意义
DOI：
10.1016/j.tecto.2020.228480
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发表时间：
2020-08
期刊：
影响因子：
2.9
通讯作者：
Hongshuang Zhang
中科院分区：
文献类型：
--
作者：
Rubing Han;Qiusheng Li;Rong Huang;Hongshuang Zhang
本文利用中国东南部267个临时台站和203个永久台站的宽带台阵，利用P波接收函数共转换点（CCP）方法，对地幔过渡带（MTZ）的三维结构、温度和含水量进行了研究。结果表明，29 ° N线以北和以南的MTZ具有不同的结构特征。在北方，660 km的不连续面一般比地球仪模型更深，并且存在两个独立的具有高速、低温和缺水特征的局部凹陷。我们解释为两个以前的俯冲板块在MTZ停滞，可能与两个单独的俯冲事件在不同的时间。而在南部，410公里的不连续性是局部凹陷，导致减薄的MTZ。特别是在29 ° N线以南的华夏地块，根据MTZ的结构和温度、含水量的估算，我们认为MTZ的脱水作用是岩石圈通过与软流圈相互作用减薄的重要机制之一。然后，我们提出了一个动力学模型，结合古太平洋板块俯冲和上地幔对流解释岩石圈伸展和减薄，岩浆岩分布，弱地震活动和盆山地貌。这一模式不同于华北地块29 ° N线以北的模式。
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 flatslab 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.
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DOI：
10.3390/geosciences9120505
发表时间：
2019-12
期刊：
--
影响因子：
--
作者：
I. Fomin;C. Schiffer
通讯作者：
I. Fomin;C. Schiffer
影响因子：
5.3
作者：
Liu, Xin;Zhao, Dapeng;Wei, Wei
通讯作者：
Wei, Wei
影响因子：
4.6
作者：
Ishii T;Huang R;Fei H;Koemets I;Liu Z;Maeda F;Yuan L;Wang L;Druzhbin D;Yamamoto T;Bhat S;Farla R;Kawazoe T;Tsujino N;Kulik E;Higo Y;Tange Y;Katsura T
通讯作者：
Katsura T
影响因子：
2.8
作者：
KENNETT, BLN;ENGDAHL, ER
通讯作者：
ENGDAHL, ER
DOI：
10.1029/168gm02
发表时间：
2013-03
期刊：
Geophysical monograph
影响因子：
--
作者：
J. Smyth;S. Jacobsen
通讯作者：
J. Smyth;S. Jacobsen