Temporal Evolution of Proto-Izu-Bonin-Mariana Arc Volcanism over 10 Myr: Constraints from Statistical Analysis of Melt Inclusion Compositions

doi:10.1093/petrology/egaa022

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	Temporal Evolution of Proto-Izu-Bonin-Mariana Arc Volcanism over 10 Myr: Constraints from Statistical Analysis of Melt Inclusion Compositions
	Hamada, Morihisa 2; Iwamori, Hikaru 2,3,4; Brandl, Philipp A.5,6; Ushikubo, Takayuki 7; Shimizu, Kenji 7; Ito, Motoo 7; Li, He 8,9; Savov, Ivan P.1
刊名	JOURNAL OF PETROLOGY
	2020
卷号	61 期号:1 页码:29
关键词	Izu-Bonin-Mariana arc volatiles melt inclusion Amami Sankaku Basin International Ocean Discovery Program statistical analysis
ISSN号	0022-3530
DOI	10.1093/petrology/egaa022
通讯作者	Hamada, Morihisa(mhamada@jamstec.go.jp)
英文摘要	International Ocean Discovery Program (IODP) Expedition 351 'Izu-Bonin-Mariana (IBM) Arc Origins' drilled Site U1438, situated in the northwestern region of the Philippine Sea. Here volcaniclastic sediments and the igneous basement of the proto-IBM volcanic arc were recovered. To gain a better understanding of the magmatic processes and evolution of the proto-IBM arc, we studied melt inclusions hosted in fresh igneous minerals and sampled from 30-40 Myr old deposits, reflecting the maturation of arc volcanism following subduction initiation at 52 Ma. We performed a novel statistical analysis on the major element composition of 237 representative melt inclusions selected from a previously published dataset, covering the full age range between 30 and 40 Ma. In addition, we analysed volatiles (H2O, S, F and Cl) and P2O5 by secondary ion mass spectrometry for a subset of 47 melt inclusions selected from the dataset. Based on statistical analysis of the major element composition of melt inclusions and by considering their trace and volatile element compositions, we distinguished five main clusters of melt inclusions, which can be further separated into a total of eight subclusters. Among the eight subclusters, we identified three major magma types: (1) enriched medium-K magmas, which form a tholeiitic trend (30-38 Ma); (2) enriched medium-K magmas, which form a calc-alkaline trend (30-39 Ma); (3) depleted low-K magmas, which form a calc-alkaline trend (35-40 Ma). We demonstrate the following: (1) the eruption of depleted low-K calc-alkaline magmas occurred prior to 40 Ma and ceased sharply at 35 Ma; (2) the eruption of depleted low-K calc-alkaline magmas, enriched medium-K calc-alkaline magmas and enriched medium-K tholeiitic magmas overlapped between 35 and 38-39 Ma; (3) the eruption of enriched medium-K tholeiitic and enriched medium-K calc-alkaline magmas became predominant thereafter at the proto-IBM arc. Identification of three major magma types is distinct from the previous work, in which enriched medium-K calc-alkaline magmas and depleted low-K calc-alkaline magmas were not identified. This indicates the usefulness of our statistical analysis as a powerful tool to partition a mixture of multivariable geochemical datasets, such as the composition of melt inclusions in this case. Our data suggest that a depleted mantle source had been replaced by an enriched mantle source owing to convection beneath the proto-IBM arc from >40 to 35 Ma. Finally, thermodynamic modelling indicates that the overall geochemical variation of melt inclusions assigned to each cluster can be broadly reproduced either by crystallization differentiation assuming P= 50 MPa (similar to 2 km deep) and similar to 2 wt% H2O (almost saturated H2O content at 50 MPa) or P=300 MPa (similar to 15 km deep) and similar to 6 wt% H2O (almost saturated H2O content at 300 MPa). Assuming oxygen fugacity (f(O2)) of log f(O2) equal to +1 relative to the nickel-nickel oxide (NNO) buffer best reproduces the overall geochemical variation of melt inclusions, but assuming more oxidizing conditions (log v = +1 to +2 NNO) probably reproduces the geochemical variation of enriched medium-K and calc-alkaline melt inclusions (30-39 Ma).
资助项目	Alexander von Humboldt Foundation ; NERC[NE/M007782/1] ; UK-IODP
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000593092900005
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/169276]
专题	中国科学院海洋研究所
通讯作者	Hamada, Morihisa
作者单位	1.Univ Leeds, Sch Earth & Environm, Inst Geophys & Tecton, Leeds LS2 9JT, W Yorkshire, England 2.Japan Agcy Marine Earth Sci & Technol, Res Inst Marine Geodynam, Volcanoes & Earths Interior Res Ctr, Solid Earth Geochem Res Grp, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan 3.Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528551, Japan 4.Univ Tokyo, Earthquake Res Inst, Bunkyo Ku, 1-1-1 Yayoi, Tokyo 1130032, Japan 5.GEOMAR Helmholtz Ctr Ocean Res Kiel, Wischhofstr 1-3, D-24148 Kiel, Germany 6.Australian Natl Univ, Res Sch Earth Sci, 142 Mills Rd, Acton, ACT 2601, Australia 7.Japan Agcy Marine Earth Sci & Technol, Kochi Inst Core Sample Res, 200 Monobe Otsu, Nankoku, Kochi 7838502, Japan 8.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, 7 Nanhai Rd, Qingdao 266071, Peoples R China 9.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
推荐引用方式 GB/T 7714	Hamada, Morihisa,Iwamori, Hikaru,Brandl, Philipp A.,et al. Temporal Evolution of Proto-Izu-Bonin-Mariana Arc Volcanism over 10 Myr: Constraints from Statistical Analysis of Melt Inclusion Compositions[J]. JOURNAL OF PETROLOGY,2020,61(1):29.
APA	Hamada, Morihisa.,Iwamori, Hikaru.,Brandl, Philipp A..,Ushikubo, Takayuki.,Shimizu, Kenji.,...&Savov, Ivan P..(2020).Temporal Evolution of Proto-Izu-Bonin-Mariana Arc Volcanism over 10 Myr: Constraints from Statistical Analysis of Melt Inclusion Compositions.JOURNAL OF PETROLOGY,61(1),29.
MLA	Hamada, Morihisa,et al."Temporal Evolution of Proto-Izu-Bonin-Mariana Arc Volcanism over 10 Myr: Constraints from Statistical Analysis of Melt Inclusion Compositions".JOURNAL OF PETROLOGY 61.1(2020):29.