DOI: 10.1016/j.epsl.2018.08.029
Scopus记录号: 2-s2.0-85052478265
论文题名: Magnetic anomaly map of Ori Massif and its implications for oceanic plateau formation
作者: Huang Y. ; Sager W.W. ; Tominaga M. ; Greene J.A. ; Zhang J. ; Nakanishi M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 501 起始页码: 46
结束页码: 55
语种: 英语
英文关键词: magnetic anomaly
; mid-ocean ridge
; oceanic plateau
; Shatsky Rise
; submarine volcanism
Scopus关键词: Buildings
; Inverse problems
; Magnetic structure
; Magnetism
; Structural geology
; Submarine geology
; Volcanoes
; Magnetic anomalies
; Mid-ocean ridges
; Oceanic plateaux
; Shatsky Rise
; Submarine volcanism
; Magnetic polarity
; crustal thickness
; geological mapping
; Jurassic-Cretaceous boundary
; magnetic anomaly
; mid-ocean ridge
; oceanic lithosphere
; plate boundary
; seafloor spreading
; submarine volcano
; volcanism
; Pacific Ocean
; Shatsky Rise
英文摘要: Many oceanic plateaus have been emplaced at or adjacent to mid-ocean ridges. To explain plateau volume and thickened crust compared to normal oceanic crust, hotspot–ridge interaction is commonly assumed, but the manner of interaction remains unclear. The Shatsky Rise oceanic plateau is a large volcanic mountain that formed at a triple junction during Late Jurassic and Early Cretaceous time. Recent drilling and seismic investigations suggest that the intermediate edifice in the rise, Ori Massif, is a central volcano. Paradoxically, magnetic lineations were traced across parts of Ori Massif, implying formation at a spreading ridge. In this study, we examined magnetic anomalies over and around Ori Massif to obtain insights about the formation of this volcanic edifice. Magnetic data from 21 cruises were corrected, combined, and gridded to construct a magnetic anomaly map. Forward and inverse magnetic modeling was done to investigate the magnetic structure of Ori Massif. The results imply that this large volcanic edifice is predominantly characterized by linear magnetic anomalies resulting from alternating normal and reversed polarity magnetization blocks, analogous to magnetic anomalies recorded by spreading-ridges. This magnetic structure is not expected for a central volcano that was built by long runout lava flows, implying that Ori Massif eruptions must have been constrained near the ridge axis. Magnetic bights on the north and south boundaries of Ori Massif imply that it was bracketed by triple junctions, indicating complex ridge tectonics during the formation of Shatsky Rise. The surprising finding that Ori Massif is traversed by coherent linear magnetic anomalies indicates that oceanic plateaus can record seafloor spreading magnetic anomalies despite large crustal thickness. Other oceanic plateaus also record linear magnetic anomalies, implying a link between divergent plate boundaries and oceanic plateau volcanism. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109668
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Oceanography, Texas A&M University, College Station, TX 77843, United States; College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China; Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204, United States; Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, United States; CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China; Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba-City, Chiba 263-8522, Japan
Recommended Citation:
Huang Y.,Sager W.W.,Tominaga M.,et al. Magnetic anomaly map of Ori Massif and its implications for oceanic plateau formation[J]. Earth and Planetary Science Letters,2018-01-01,501