气候变化领域集成服务门户(CCPortal): Magnetic Anomaly Map of Shatsky Rise and Its Implications for Oceanic Plateau Formation

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DOI	10.1029/2019JB019116
	Magnetic Anomaly Map of Shatsky Rise and Its Implications for Oceanic Plateau Formation
	Huang Y.; Sager W.W.; Zhang J.; Tominaga M.; Greene J.; Nakanishi M.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	Shatsky Rise oceanic plateau was emplaced during a period of frequent geomagnetic polarity reversals, allowing reconstruction of its tectonic evolution using magnetic anomalies. Prior studies mainly focused on identifying magnetic isochrons and encountered difficulties in tracing magnetic lineations over high relief. We complied a large magnetic data set over Shatsky Rise and its environs, using 5.5 × 106 data points from 96 geophysical cruises spanning 54 years. The long-time span and heterogeneity of component data sets made data merger a challenge. Contributions of internal and external fields, and spurious readings were removed during processing. A “backbone” method, using recent GPS-navigated data as a foundation, was developed to improve the coherency of the data set. The singular characteristic of the new magnetic anomaly map is that linear magnetic anomalies are ubiquitous. In nearly every place where data are dense enough to delineate anomaly trends, the plateau and surrounding crust are characterized by linear anomalies. Discordant anomalies in some areas imply complex tectonics related to triple junction migration and ridge reorientation. Tamu Massif apparently formed along a segment of Pacific-Farallon spreading ridge that rotated by 90° as a triple junction migrated through the edifice. Ori Massif appears to have formed on the Pacific-Izanagi ridge between triple junctions. Shirshov Massif contains discordant lineations that may indicate a microplate. The pervasive occurrence of linear magnetic anomalies within Shatsky Rise implies that these volcanic edifices must have formed by spreading analogous to mid-ocean ridges that formed anomalously thick crust. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	magnetic anomaly; magnetic data processing; mid-ocean ridges; oceanic plateau; Shatsky Rise
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187338
作者单位	Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education, Wuhan, China; Department of Oceanography, Texas A&M University, College Station, TX, United States; Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, United States; Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China; Department of Geology and Geophysics, Texas A&M University, College Station, TX, United States; Graduate School of Science, Chiba University, Chiba, Japan
推荐引用方式 GB/T 7714	Huang Y.,Sager W.W.,Zhang J.,et al. Magnetic Anomaly Map of Shatsky Rise and Its Implications for Oceanic Plateau Formation[J],2021,126(2).
APA	Huang Y.,Sager W.W.,Zhang J.,Tominaga M.,Greene J.,&Nakanishi M..(2021).Magnetic Anomaly Map of Shatsky Rise and Its Implications for Oceanic Plateau Formation.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Huang Y.,et al."Magnetic Anomaly Map of Shatsky Rise and Its Implications for Oceanic Plateau Formation".Journal of Geophysical Research: Solid Earth 126.2(2021).