globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2017.10.023
Scopus记录号: 2-s2.0-85033557580
论文题名:
Age of Izu–Bonin–Mariana arc basement
作者: Ishizuka O.; Hickey-Vargas R.; Arculus R.J.; Yogodzinski G.M.; Savov I.P.; Kusano Y.; McCarthy A.; Brandl P.A.; Sudo M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 481
起始页码: 80
结束页码: 90
语种: 英语
英文关键词: 40Ar/39Ar age ; arc basement ; Izu–Bonin–Mariana arc ; subduction initiation
Scopus关键词: Basalt ; Buildings ; arc basement ; Magmatic evolution ; Mariana arc ; Radiometric dating ; Seafloor spreading ; Subduction initiation ; Tholeiitic basalts ; ^40Ar/^39Ar age ; Tectonics ; age determination ; argon-argon dating ; Ocean Drilling Program ; Pacific plate ; Philippine Sea plate ; seafloor spreading ; subduction ; tectonic evolution ; Pacific Ocean ; Pacific Ocean (West)
英文摘要: Documenting the early tectonic and magmatic evolution of the Izu–Bonin–Mariana (IBM) arc system in the Western Pacific is critical for understanding the process and cause of subduction initiation along the current convergent margin between the Pacific and Philippine Sea plates. Forearc igneous sections provide firm evidence for seafloor spreading at the time of subduction initiation (52 Ma) and production of “forearc basalt”. Ocean floor drilling (International Ocean Discovery Program Expedition 351) recovered basement-forming, low-Ti tholeiitic basalt crust formed shortly after subduction initiation but distal from the convergent margin (nominally reararc) of the future IBM arc (Amami Sankaku Basin: ASB). Radiometric dating of this basement gives an age range (49.3–46.8 Ma with a weighted average of 48.7 Ma) that overlaps that of basalt in the present-day IBM forearc, but up to 3.3 m.y. younger than the onset of forearc basalt activity. Similarity in age range and geochemical character between the reararc and forearc basalts implies that the ocean crust newly formed by seafloor spreading during subduction initiation extends from fore- to reararc of the present-day IBM arc. Given the age difference between the oldest forearc basalt and the ASB crust, asymmetric spreading caused by ridge migration might have taken place. This scenario for the formation of the ASB implies that the Mesozoic remnant arc terrane of the Daito Ridges comprised the overriding plate at subduction initiation. The juxtaposition of a relatively buoyant remnant arc terrane adjacent to an oceanic plate was more favourable for subduction initiation than would have been the case if both downgoing and overriding plates had been oceanic. © 2017 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110162
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: Institute of Earthquake and Volcano Geology, Geological Survey of Japan, AIST, Central 7, 1-1-1, Higashi, Tsukuba, Ibaraki 305-8567, Japan; Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima, Yokosuka, Kanagawa 237-0061, Japan; Earth and Environment Department, Florida International University, Modesto Maidique Campus, AHC5-394, Miami, FL 33199, United States; Research School of Earth Sciences, The Australian National University, 142 Mills Road, Acton, ACT 2601, Australia; School of Earth, Ocean, and Environment, University of South Carolina, 701 Sumter Street, EWSC617, Columbia, SC 29208, United States; School of Earth and Environment, The University of Leeds, Institute of Geophysics and Tectonics, Leeds, LS2 9JT, United Kingdom; Institute of Earth Sciences, University of Lausanne, Geopolis, Lausanne, 1015, Switzerland; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, 24148, Germany; Institut für Erd- und Umweltwissenschaften, Universität Potsdam, Karl-Liebknecht-Str. 24, Haus 27, Golm, 14476, Germany; School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Clifton, BS8 1RJ, United Kingdom

Recommended Citation:
Ishizuka O.,Hickey-Vargas R.,Arculus R.J.,et al. Age of Izu–Bonin–Mariana arc basement[J]. Earth and Planetary Science Letters,2018-01-01,481
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