The magma plumbing system in the Mariana Trough back-arc basin at 18 degrees N | |
Lai,Zhiqing1,5; Zhao,Guangtao1,5; Han,Zongzhu1,5; Huang,Bo2; Li,Min3; Tian,Liyan4; Liu,Bo1,5; Bu,Xuejiao1,5 | |
刊名 | Journal Of Marine Systems
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2018 | |
卷号 | 180页码:132-139 |
英文摘要 | Mafic magmas are common in back-arc basin, once stalled in the crust, these magmas may undergo different evolution. In this paper, compositional and textural variations of plagioclase as well as mineral-melt geothermobarometry are presented for basalts erupted from the central Mariana Trough (CMT). These data reveal crystallization conditions and we attempt a reconstruction of the magma plumbing system of the CMT. Plagioclase megacrysts, phenocrysts, microphenocrysts, microlites, olivine, spinel, and clinopyroxene have been recognized in basalt samples, using BSE images and compositional features. The last three minerals are homogeneous as microphenocrysts. Mineral-melt barometry indicates that plagioclase crystals crystallized and eventually grew into phenocrysts and megacrysts in mush zone with depth of 5–9 km, in which the normal zoning plagioclases crystallized in the interval of various batches of basic magma recharging. Plagioclase megacrysts and phenocrysts were dissolved and/or resorbed, when new basic magmas injected into the mush zone near Moho depth. It is inferred that magma extracted from the mush zone, and adiabatically ascended via different pathways. Some basaltic magmas underwent plagioclase and clinopyroxene microphenocrysts crystallization in low-pressure before eruption. Plagioclase microlites and outermost rims probably crystallized after eruption. |
语种 | 英语 |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.idsse.ac.cn/handle/183446/7912] ![]() |
专题 | 深海科学研究部_深海地质与地球化学研究室 |
通讯作者 | Zhao,Guangtao; Han,Zongzhu |
作者单位 | 1.College of Marine Geosciences, Ocean University of China 2.National Oceanographic Center 3.Shandong Institute for Ocean Resources Exploration 4.Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences 5.Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education |
推荐引用方式 GB/T 7714 | Lai,Zhiqing,Zhao,Guangtao,Han,Zongzhu,et al. The magma plumbing system in the Mariana Trough back-arc basin at 18 degrees N[J]. Journal Of Marine Systems,2018,180:132-139. |
APA | Lai,Zhiqing.,Zhao,Guangtao.,Han,Zongzhu.,Huang,Bo.,Li,Min.,...&Bu,Xuejiao.(2018).The magma plumbing system in the Mariana Trough back-arc basin at 18 degrees N.Journal Of Marine Systems,180,132-139. |
MLA | Lai,Zhiqing,et al."The magma plumbing system in the Mariana Trough back-arc basin at 18 degrees N".Journal Of Marine Systems 180(2018):132-139. |
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