The seismic Moho structure of Shatsky Rise oceanic plateau, northwest Pacific Ocean

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	The seismic Moho structure of Shatsky Rise oceanic plateau, northwest Pacific Ocean
	Zhang, Jinchang; Sager, William W.; Korenaga, Jun
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2016
卷号	441 页码:143-154
关键词	oceanic plateau Shatsky Rise Moho structure crustal thickness reflection and refraction seismics Airy isostatic compensation
通讯作者	Zhang, JC (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China. ; Zhang, JC (reprint author), Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA.
中文摘要	Oceanic plateaus are large igneous provinces formed by extraordinary eruptions that create thick oceanic crust, whose structure is poorly known owing to the lack of deep-penetration seismic data. Multichannel seismic (MCS) reflection and wide-angle refraction data allow us to show Moho structure beneath a large part of the Shatsky Rise oceanic plateau in the northwest Pacific Ocean. Moho reflectors in the two data sets can be connected to trace the interface from the adjacent abyssal plain across much of the interior. The reflectors display varied character in continuity, shape, and amplitude, similar to characteristics reported in other locations. Beneath normal crust, the Moho is observed at similar to 13 km depth (similar to 7 km below the seafloor) in MCS data and disappears at similar to 20 km depth (similar to 17 km below the seafloor) beneath the high plateau. Moho at the distal flanks dips downward towards the center with slopes of similar to 0.5 degrees-1 degrees, increasing to 3 degrees-5 degrees at the middle flanks. Seismic Moho topography is consistent with Airy isostasy, confirming this widely-applied assumption. Data from this study show that crustal thickness between the massifs in the interior of the plateau is nearly twice normal crustal thickness, despite the fact that this crust records apparently normal seafloor spreading magnetic lineations. The Moho model allows improved estimates of plateau area (5.33 x 10(5) km(2)) and volume (6.90 x 10(6) km(3)), the latter assuming that the entire crust was formed by Shatsky Rise volcanism because the massifs formed at spreading ridges. This study is unique in showing Moho depth and structure over an extraordinarily large area beneath an oceanic plateau, giving insight to plateau structure and formation. (C) 2016 Elsevier B.V. All rights reserved.
学科主题	Geochemistry & Geophysics
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/15437]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Zhang, Jinchang,Sager, William W.,Korenaga, Jun. The seismic Moho structure of Shatsky Rise oceanic plateau, northwest Pacific Ocean[J]. EARTH AND PLANETARY SCIENCE LETTERS,2016,441:143-154.
APA	Zhang, Jinchang,Sager, William W.,&Korenaga, Jun.(2016).The seismic Moho structure of Shatsky Rise oceanic plateau, northwest Pacific Ocean.EARTH AND PLANETARY SCIENCE LETTERS,441,143-154.
MLA	Zhang, Jinchang,et al."The seismic Moho structure of Shatsky Rise oceanic plateau, northwest Pacific Ocean".EARTH AND PLANETARY SCIENCE LETTERS 441(2016):143-154.