The evolution of crystal-poor rhyolite in the middle Okinawa Trough and its implications for the state of magma chamber

doi:10.1002/gj.4971

IOCAS-IR > 海洋环流与波动重点实验室

	The evolution of crystal-poor rhyolite in the middle Okinawa Trough and its implications for the state of magma chamber
	Luo, Xinyu 1,2; Zeng, Zhigang 1,2,3,4; Chen, Zuxing 1,3,4; Zhang, Yuxiang 1,3,4; Du, Xiaoning1,2 ; Qi, Haiyan 1,3,4
	2024-05-02
发表期刊	GEOLOGICAL JOURNAL
ISSN	0072-1050
页码	16
通讯作者	Zeng, Zhigang(zgzeng@qdio.ac.cn)
摘要	The crystal-poor rhyolitic pumice is the product of extreme magma differentiation and is characterized by highly vesicular, honeycomb-like structure. However, little is known about the evolutionary history and the time of volatile saturation of the pumice-forming melt. A crystal-poor rhyolitic pumice (TVG7-1) has been collected from the Yoron Hole hydrothermal field in the middle Okinawa Trough, a young continental margin back-arc basin in the western Pacific. This study conducted a detailed analysis on the texture and in situ chemical composition of plagioclase, orthopyroxene and Fe-Ti oxides to reveal the evolution process, storage state and eruption triggers of eruptible silicic melt. Texture and zoning of specific minerals and mineral populations suggest a magmatic evolution history of open system. Additionally, the hollow reentrant texture, as well as results from plagioclase-liquid hygrometers, confirm a water-rich melt pocket. The exsolution of volatiles (H2O, etc.), in this melt pocket, will contribute to local oxidation conditions, which may have been recorded by the concordant behaviour of FeO and An in plagioclase. Then, the overpressure caused by volatile exsolution would destabilize the magma chamber, which will eventually be broken by magma mixing/recharge, and lead to violent melt evacuation. Consequently, crystal size distribution (CSD) provides a new perspective on understanding the kinetic effect of magma mixing/recharge in the Okinawa Trough, especially on the mineral populations. Our study reveals the petrogenesis of crystal-poor rhyolite within the framework of the mush model, refines the magma evolution history and demonstrates that pumice magma reaches volatile saturation before the eruption. Schematic of the magma system beneath the Yoron Hole hydrothermal area. Prior to eruption, rhyolitic melt from the middle Okinawa Trough existed as a bubbly, volatile-saturated magma reservoir. Magma underplating/replenishment leaves imprints not only on specific minerals (texture, chemical composition) but also on the crystal size distribution and crystal population. image
关键词	crystal size distribution crystal-poor rhyolite melt storage state mush model Okinawa Trough
DOI	10.1002/gj.4971
收录类别	SCI
语种	英语
资助项目	National Basic Research Program of China ; National Natural Science Foundation of China[42330409] ; National Natural Science Foundation of China[42221005] ; National Natural Science Foundation of China[91958213] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB42020402] ; Taishan Scholars Program[ts201511061] ; [2013CB429700]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001216877900001
出版者	WILEY
WOS关键词	SILICIC MAGMA ; CRUSTAL ASSIMILATION ; SIZE DISTRIBUTIONS ; TIME-SCALES ; PLAGIOCLASE ; ARC ; DIFFUSION ; TRACE ; VOLCANO ; QUARTZ
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/185693
专题	海洋环流与波动重点实验室海洋地质与环境重点实验室
通讯作者	Zeng, Zhigang
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Key Lab Marine Geol & Environm,Seafloor Hydrotherm, Qingdao, Shandong, Peoples R China 2.Univ Chinese Acad Sci, Coll Marine Sci, Beijing, Peoples R China 3.Qingdao Marine Sci & Technol Ctr, Lab Marine Mineral Resources, Qingdao, Shandong, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, 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	Luo, Xinyu,Zeng, Zhigang,Chen, Zuxing,et al. The evolution of crystal-poor rhyolite in the middle Okinawa Trough and its implications for the state of magma chamber[J]. GEOLOGICAL JOURNAL,2024:16.
APA	Luo, Xinyu,Zeng, Zhigang,Chen, Zuxing,Zhang, Yuxiang,Du, Xiaoning,&Qi, Haiyan.(2024).The evolution of crystal-poor rhyolite in the middle Okinawa Trough and its implications for the state of magma chamber.GEOLOGICAL JOURNAL,16.
MLA	Luo, Xinyu,et al."The evolution of crystal-poor rhyolite in the middle Okinawa Trough and its implications for the state of magma chamber".GEOLOGICAL JOURNAL (2024):16.