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A record of spontaneous subduction initiation in the Izu-Bonin-Mariana arc
Arculus, Richard J.1; Ishizuka, Osamu2,3; Bogus, Kara A.4; Gurnis, Michael5; Hickey-Vargas, Rosemary6; Aljahdali, Mohammed H.7; Bandini-Maeder, Alexandre N.8; Barth, Andrew P.9; Brandl, Philipp A.1,10; Drab, Laureen11; Guerra, Rodrigo do Monte12; Hamada, Morihisa13; Jiang, Fuqing14; Kanayama, Kyoko15; Kender, Sev16,17; Kusano, Yuki18; Li, He18; Loudin, Lorne C.19; Maffione, Marco20; Marsaglia, Kathleen M.21; McCarthy, Anders22; Meffre, Sebastien23; Morris, Antony24; Neuhaus, Martin25; Savov, Ivan P.26; Sena, Clara27; Tepley, Frank J., III; van der Land, Cees29; Yogodzinski, Gene M.30; Zhang, Zhaohui31
AbstractThe initiation of tectonic plate subduction into the mantle is poorly understood. If subduction is induced by the push of a distant mid-ocean ridge or subducted slab pull, we expect compression and uplift of the overriding plate. In contrast, spontaneous subduction initiation, driven by subsidence of dense lithosphere along faults adjacent to buoyant lithosphere, would result in extension and magmatism. The rock record of subduction initiation is typically obscured by younger deposits, so evaluating these possibilities has proved elusive. Here we analyse the geochemical characteristics of igneous basement rocks and overlying sediments, sampled from the Amami Sankaku Basin in the northwest Philippine Sea. The uppermost basement rocks are areally widespread and supplied via dykes. They are similar in composition and age-as constrained by the biostratigraphy of the overlying sediments-to the 52-48-million-year-old basalts in the adjacent Izu-Bonin-Mariana fore-arc. The geochemical characteristics of the basement lavas indicate that a component of subducted lithosphere was involved in their genesis, and the lavas were derived from mantle source rocks that were more melt-depleted than those tapped at mid-ocean ridges. We propose that the basement lavas formed during the inception of Izu-Bonin-Mariana subduction in a mode consistent with the spontaneous initiation of subduction.
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Affiliation1.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2601, Australia
2.Geol Survey Japan AIST, Tsukuba, Ibaraki 3058567, Japan
3.Japan Agcy Marine Earth Sci & Technol, Res & Dev Ctr Ocean Drilling Sci, Yokosuka, Kanagawa 2370061, Japan
4.Texas A&M Univ, Int Ocean Discovery Program, College Stn, TX 77845 USA
5.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
6.Florida Int Univ, Earth & Environm Dept, Miami, FL 33199 USA
7.Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA
8.Univ Western Australia, Sch Earth & Environm, Ctr Energy Geosci, Perth, WA 6009, Australia
9.Indiana Univ Purdue Univ, Dept Earth Sci, Indianapolis, IN 46202 USA
10.Univ Erlangen Nurnberg, Geozentrum Nordbayern, D-91054 Erlangen, Germany
11.Columbia Univ, Lamont Doherty Earth Observ, Borehole Res Grp, Palisades, NY 10964 USA
12.Univ Vale Rio dos Sinos, Technol Inst Micropaleontol, BR-93022 Sao Leopoldo, Brazil
13.Japan Agcy Marine Earth Sci & Technol, Dept Solid Earth Geochem, Yokosuka, Kanagawa 2370061, Japan
14.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
15.Kanazawa Univ, Coll Sci & Engn, Kanazawa, Ishikawa 9201192, Japan
16.Univ Nottingham, Sch Geog, Nottingham NG7 2RD, England
17.British Geol Survey, Keyworth NG12 5GG, Notts, England
18.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China
19.Univ New Hampshire, Dept Earth Sci, Durham, NH 03824 USA
20.Univ Utrecht, Inst Earth Sci, NL-3584 Utrecht, Netherlands
21.Calif State Univ Northridge, Dept Geol Sci, Northridge, CA 91330 USA
22.Univ Lausanne, Inst Earth Sci, CH-1015 Lausanne, Switzerland
23.Univ Tasmania, Sch Earth Sci, Hobart, Tas 7001, Australia
24.Univ Plymouth, Sch Geog Earth & Environm Sci, Plymouth PL4 8AA, Devon, England
25.Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterrestr Phys, D-38106 Braunschweig, Germany
26.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England
27.Univ Aveiro, Geosci Dept CESAM, P-3810193 Aveiro, Portugal
28.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA
29.Univ Newcastle, Sch Civil Engn & Geosci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
30.Univ S Carolina, Dept Earth & Ocean Sci, Columbia, SC 29208 USA
31.Nanjing Univ, Earth Sci, Nanjing 210093, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Arculus, Richard J.,Ishizuka, Osamu,Bogus, Kara A.,et al. A record of spontaneous subduction initiation in the Izu-Bonin-Mariana arc[J]. NATURE GEOSCIENCE,2015,8(9):728-733.
APA Arculus, Richard J..,Ishizuka, Osamu.,Bogus, Kara A..,Gurnis, Michael.,Hickey-Vargas, Rosemary.,...&Zhang, Zhaohui.(2015).A record of spontaneous subduction initiation in the Izu-Bonin-Mariana arc.NATURE GEOSCIENCE,8(9),728-733.
MLA Arculus, Richard J.,et al."A record of spontaneous subduction initiation in the Izu-Bonin-Mariana arc".NATURE GEOSCIENCE 8.9(2015):728-733.
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