Mafic magma recharge triggered eruption of a long-lived shallow silicic magma reservoir beneath a submarine volcano from the southwestern Okinawa Trough

doi:10.1016/j.lithos.2023.107229

IOCAS-IR > 海洋地质与环境重点实验室

	Mafic magma recharge triggered eruption of a long-lived shallow silicic magma reservoir beneath a submarine volcano from the southwestern Okinawa Trough
	Chen, Zuxing 1,2,3; Tamehe, Landry Soh 4; Zhang, Yuxiang 1,2,3; Chen, Shuai 1,2,3; Zeng, Zhigang 1,2,3,5; Yin, Xuebo 1,2,3; Wang, Xiaoyuan 1,2,3; Qi, Haiyan 1,2,3; Cai, Mingjiang6
	2023-09-01
发表期刊	LITHOS
ISSN	0024-4937
卷号	452 页码:12
通讯作者	Chen, Zuxing([email protected]) ; Zeng, Zhigang([email protected])
摘要	Abundant submarine volcanoes have been identified in the southwestern Okinawa Trough, yet the duration of shallow magma reservoirs and processes driving their eruptions remains unclear. Here, the texture and in situ element compositions of orthopyroxene and magnetite in the dacite and mafic magmatic enclaves (MMEs) from the FDV-1 submarine volcano were investigated to decipher the duration of pre-eruption shallow silicic magma storage and eruption triggering processes. Both unzoned and zoned orthopyroxene phenocrysts were observed in the host dacite. The rims of zoned and unzoned orthopyroxene have similar compositions with Mg# from 49 to 55, Cr = 2.31-9.26 & mu;g/g, V = 54.10-137 & mu;g/g, and Ni = 16.44-21.19 & mu;g/g, and they are in equilibrium with the rhyolitic matrix, which is consistent with growth in the shallow silicic magma reservoir. In contrast, the high Mg# cores (Mg# = 63-79) in the zoned orthopyroxenes are in equilibrium with basalt, with significant enrichment in Cr (1092-1737 & mu;g/g), Ni (106-181 & mu;g/g), and V (183-295 & mu;g/g), which indicates a recycled (antecryst) origin by mafic magma recharge and magma mixing. Furthermore, the timescales from Fe-Mg interdiffusion in orthopyroxene phenocrysts suggest that the magma mixing is approximately 600 years before eruption. Correspondingly, the shallow silicic magma reservoir beneath the submarine volcano is longevity. The presence of bubble and V-depleted magnetite aggregates in the MMEs suggests that volatile-saturated and oxidized mafic magma recharges into the shallow silicic magma chamber. Moreover, the distinct contents of relatively fast-diffusing Ni in magnetite between the MMEs and host dacite suggest that the mafic magma in-jection into the silicic magma reservoir and formation of the MMEs must have occurred over very short time -scales (< 24 h) before the eruption to inhibit complete re-equilibration. Therefore, this last mafic magma recharge induces destabilization of the long-lived shallow silicic magma reservoir and leads to the dacitic magma eruption.
关键词	Orthopyroxene Magnetite Dacite Magma mixing Okinawa Trough
DOI	10.1016/j.lithos.2023.107229
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[42106083]; National Natural Science Foundation of China[91958213]; National Natural Science Foundation of China[42221005]; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB42020402]; Shandong Provincial Natural Science Foundation, China[ZR2020QD069]; Shandong Provincial Natural Science Foundation, China[ZR2020MD068]; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2020KG11]; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2022KG10]; National Basic Research Program of China[2013CB429700]; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061]
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:001013622100001
出版者	ELSEVIER
WOS关键词	CALC-ALKALINE DIFFERENTIATION ; ORTHO-PYROXENE ; TIME-SCALES ; BUBBLE NUCLEATION ; ZONING PATTERNS ; ANDESITE MAGMA ; TRACE-ELEMENT ; DIFFUSION ; FE ; MAGNETITE
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/182343
专题	海洋地质与环境重点实验室
通讯作者	Chen, Zuxing; Zeng, Zhigang
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Shandong, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 4.China Nonferrous Met Guilin Geol & Min Co Ltd, Guilin 541004, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Quanzhou Normal Univ, Sch Resources & Environm Sci, Quanzhou 362000, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Chen, Zuxing,Tamehe, Landry Soh,Zhang, Yuxiang,et al. Mafic magma recharge triggered eruption of a long-lived shallow silicic magma reservoir beneath a submarine volcano from the southwestern Okinawa Trough[J]. LITHOS,2023,452:12.
APA	Chen, Zuxing.,Tamehe, Landry Soh.,Zhang, Yuxiang.,Chen, Shuai.,Zeng, Zhigang.,...&Cai, Mingjiang.(2023).Mafic magma recharge triggered eruption of a long-lived shallow silicic magma reservoir beneath a submarine volcano from the southwestern Okinawa Trough.LITHOS,452,12.
MLA	Chen, Zuxing,et al."Mafic magma recharge triggered eruption of a long-lived shallow silicic magma reservoir beneath a submarine volcano from the southwestern Okinawa Trough".LITHOS 452(2023):12.