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A complex magmatic system beneath the middle and northern Okinawa Trough: evidence from pyroxene characteristics
Liao, Renqiang1,3; Huang, Peng1,2; Hu, Ningjing4
2017-11-01
Source PublicationGEOLOGICAL JOURNAL
Volume52Issue:6Pages:1059-1068
SubtypeArticle
AbstractThe Okinawa Trough is an initial marginal back-arc basin. In this paper, we present a comparative study of pyroxenes in white and black pumice from the Okinawa Trough to explore the magmatic evolution of the region and the characteristics of the magmatic system. The results show two species of pyroxenes in the white pumice (clinopyroxene and orthopyroxene) but only one species in the black pumice (orthopyroxene). Many isomorphic replacements among the cations occurred during clinopyroxene crystallization. Clinopyroxene-melt thermobarometry yielded a temperature of 847-988 degrees C and a pressure of 2.73-7.42kbar, which vary considerably and correspond to a maximum depth of approximately 24km. All of the orthopyroxenes in both the white and black pumice crystallized at similar pressures ranging from 0.67 to 4.59kbar, which correspond to a maximum depth of approximately 15km. The clinopyroxenes crystallized mainly in the lower crust, whereas the orthopyroxenes formed at the boundary depth between the upper crust and the lower crust. The similarities in the pyroxene chemical compositions and the whole-rock characteristics between the two types of pumice indicate that both types of pumice are linked to the same magmatic system at depth. The pyroxenes crystallized from genetically related melts within a magmatic system that had undergone various degrees of differentiation. The physicochemical characteristics of the pyroxenes show that the magma chamber module changed during the crystallization process from clinopyroxenes to orthopyroxenes. This change most likely resulted from local characteristics of the near-surface structure. These observations support the model of a two-layered magma chamber' in the northern Okinawa Trough. Copyright (c) 2016 John Wiley & Sons, Ltd.
KeywordOkinawa Trough Pumice Pyroxene Magma System Magma Chamber Physical Process
DOI10.1002/gj.2873
Indexed BySCI
Language英语
WOS IDWOS:000414915500012
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/143056
Collection海洋地质与环境重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentary & Environm Geol, Qingdao, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Liao, Renqiang,Huang, Peng,Hu, Ningjing. A complex magmatic system beneath the middle and northern Okinawa Trough: evidence from pyroxene characteristics[J]. GEOLOGICAL JOURNAL,2017,52(6):1059-1068.
APA Liao, Renqiang,Huang, Peng,&Hu, Ningjing.(2017).A complex magmatic system beneath the middle and northern Okinawa Trough: evidence from pyroxene characteristics.GEOLOGICAL JOURNAL,52(6),1059-1068.
MLA Liao, Renqiang,et al."A complex magmatic system beneath the middle and northern Okinawa Trough: evidence from pyroxene characteristics".GEOLOGICAL JOURNAL 52.6(2017):1059-1068.
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