Seismic images of the mantle transition zone beneath Northeast China and the Sino-Korean craton from P-wave receiver functions
Seismic images of the mantle transition zone beneath Northeast China and the Sino-Korean craton from P-wave receiver functions
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中国东北地区地幔过渡带与中朝克拉通的纵波接收函数地震图像
DOI：
10.1016/j.tecto.2016.03.002
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发表时间：
2016-04
期刊：
影响因子：
2.9
通讯作者：
Guangcheng Zhang
中科院分区：
文献类型：
--
作者：
Ruiqing Zhang;Zhanyong Gao;Qingju Wu;Zhenxing Xie;Guangcheng Zhang
利用中国东北地区和中朝克拉通的地震资料，对410和660 km处的上地幔不连续面进行了成像。这两个不连续面上的精细尺度地形变化为描绘俯冲太平洋板块的几何形状（特别是在弧-弧交界处）和解释区域新生代板内火山活动提供了重要线索。我们使用了584个宽带地震台站（主要是临时地震台阵）记录的1916次远震地震的90，000多个接收器函数。我们发现，两个不连续的平均深度分别为410公里和672公里，在研究区域之下。结果表明，在长白山火山下及火山周围的一个狭窄区域内，660 km的不连续面被强烈地压低了约20-30 km，这与以往接收函数研究的结果相一致。相比之下，中朝克拉通的大部分显示出典型的过渡带厚度（~ 260 km），因此没有提供停滞的太平洋板块的证据。我们的研究结果还揭示了一个升高的660公里的不连续性和一个较薄的过渡区都观察到的凹陷区域的西部和下方的千岛群岛，日本弧结。这一特征很可能是由于下降的太平洋板块在其前缘和交界处的撕裂。一个额外的高架660公里的不连续性，连同一个较薄的过渡区出现在附近的Dariganga熔岩场，支持解释根深蒂固的地幔柱。我们观察到的一个升高的410公里的不连续性和较厚的过渡带空间上与汉诺坝，阿尔山和五大连池周围的火山活动的扩散分布。这种相关性可能表明岩石圈迁移是这些岩浆活动的一种机制。
Seismic data from northeast (NE) China and the Sino-Korean craton were combined to image the upper mantle discontinuities at 410 and 660 km. Fine-scale topographic variations on these two discontinuities provide important clues for both delineating geometry of the subducting Pacific slab particularly at arc–arc junction and interpreting regional Cenozoic intraplate volcanism. We used over 90,000 receiver functions from 1916 teleseismic earthquakes recorded by 584 broadband seismic stations, primary those of temporary seismic arrays. We found the average depths of the two discontinuities to be 410 km and 672 km, respectively, beneath the study area. Results show that the 660-km discontinuity is strongly depressed by about 20–30 km in a narrow region beneath and around the Changbaishan volcano, consistent with the results of previous receiver function studies. In contrast, much of the Sino-Korean craton exhibits typical transition zone thickness (~ 260 km) and thus offers no evidence of a stagnated Pacific slab. Our results also reveal an elevated 660-km discontinuity and a thinner transition zone both to the west of the observed depression region and beneath the Kuril–Japan arc junction. This feature is most likely due to a tearing of the descending Pacific plate at both its leading and junction edges. An additional elevated 660-km discontinuity together with a thinner transition zone appears in the vicinity of the Dariganga lava field, supporting interpretations of a deep-rooted mantle plume. Our observations of an elevated 410-km discontinuity and a thicker transition zone correlate spatially with the diffuse distribution of volcanism around Hannuoba, Aershan and Wudalianchi. This correlation may suggest lithospheric removal as a mechanism for these magmatic activities.
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DOI：
10.1016/0168-9622(86)90054-0
发表时间：
1986
期刊：
Chemical Geology: Isotope Geoscience Section
影响因子：
--
作者：
Z. Peng;R. Zartman;K. Futa;D. G. Chen
通讯作者：
Z. Peng;R. Zartman;K. Futa;D. G. Chen
长白板内火山活动与东亚深部地震：可能存在联系？
影响因子：
2.8
作者：
Zhao, Dapeng;Tian, You
通讯作者：
Tian, You
影响因子：
2.8
作者：
KENNETT, BLN;ENGDAHL, ER
通讯作者：
ENGDAHL, ER
影响因子：
2.9
作者：
Jianye Ren;K. Tamaki;Sitian Li;Junxia Zhang
通讯作者：
Jianye Ren;K. Tamaki;Sitian Li;Junxia Zhang
影响因子：
2.3
作者：
M. Miller;B. Kennett;A. Gorbatov
通讯作者：
M. Miller;B. Kennett;A. Gorbatov