MORB Melt Transport through Atlantis Bank Oceanic Batholith (SW Indian Ridge)
文献类型：期刊论文
| 作者 | Zhang, Wei-Qi2,3,4; Dick, Henry J. B.2; Liu, Chuan-Zhou1,3,4; Lin, Yin-Zhen3,4; Angeloni, Linda M.2 |
| 刊名 | JOURNAL OF PETROLOGY
 |
| 出版日期 | 2021-06-01 |
| 卷号 | 62期号:6页码:35 |
| 关键词 | troctolite primitive melt transport melt-rock reaction Atlantis Bank ultraslow-spreading ridge |
| ISSN号 | 0022-3530 |
| DOI | 10.1093/petrology/egab034 |
| 英文摘要 | The Atlantis Bank Oceanic Batholith is a 660 km(2) gabbro massif representing the plutonic foundation of a major ridge magmatic center. It was continuously accreted, emplaced, and exposed in the rift mountains of the paleo-SW Indian Ridge from 13 to 10.3 Ma. Ocean Drilling Program (ODP) Hole 735B, drilled to 1508 m at Atlantis Bank, recovered evolved intercalated olivine and oxide gabbros representing the upper levels of the lower ocean crust. Within this section, similar to 5.6 m of primitive chromian-spinel-bearing troctolites (0.1-2 m thick), with sharp modal contacts with the host gabbros, were cored between 410 and 500 m depth. Here we present new mineral (chromian spinel, clinopyroxene, olivine, and plagioclase) major and trace element and petrographic data for the troctolite suites (i.e. troctolites, clinopyroxene-rich troctolites, troctolitic gabbros) from 410 to 528 mbsf (meters below seafloor) and olivine gabbros in the 0-274 mbsf and 410-500 mbsf intervals, and examine the origin of these troctolite layers. Equilibrium melts for the troctolites are primitive to moderately evolved, with Mg# [= 100Mg/(Mg + Fe), 48-68 mol%] comparable with those of Atlantis Bank basalts. By contrast, equilibrium melts for both the 0-274 mbsf and 410-500 mbsf host olivine gabbros are highly to moderately evolved (Mg# 27-63 mol%). The 410-500 mbsf troctolite suites maintain high clinopyroxene Mg# (81-89 mol%) and mineral concentrations of compatible elements (i.e. clinopyroxene Cr2O3 01-1.2 wt%, Ni 151-330 mu g g(-1) and olivine Ni 1055-1559 mu g g(-1)) with the increase in incompatible trace element abundances (i.e. clinopyroxene TiO2 0.3-2.1 wt%, Zr 5.8-112 mu g g(-1) and olivine Ti up to 293 mu g g(-1)). Combined with abundant dissolution-reprecipitation textures, our results indicate that the troctolites were formed by the reaction between a spinel-bearing, troctolitic mush, from which they inherited the high Mg#, Ni and Cr, and percolating melts adding incompatible trace elements. Moreover, the spinel (NiO versus TiO2) and olivine (Ti versus Y) trace element compositions indicate that the troctolites were affected by low-degree Fe-Ti-rich melt metasomatism. In contrast, both the 0-274 mbsf and 410-500 mbsf olivine gabbros display a prominent decrease in clinopyroxene Mg# (from 88 to 66) and mineral compatible element concentrations (i.e. clinopyroxene Cr2O3 from 1.1 to similar to 0 wt%, Ni from 208 to 34 mu g g(-1) and olivine Ni from 1200 to 136 mu g g(-1)) with increasing incompatible trace element abundances (e.g. clinopyroxene Zr from 4.8 to 157 mu g g(-1)). These features are compatible with the reactive porous flow of slightly to highly evolved melts through the cooling crystal mush zone. Our results, combined with the literature data, indicate that most olivine gabbros between 410 and 500 mbsf were formed prior to the troctolite layers. We document that the troctolites represent conduits for mid-ocean ridge basalt melt transport through the lower oceanic crust, whereas the olivine gabbros represent crystallization of a large crystal mush, recording initial gabbro emplacement, hyper- and sub-solidus deformation, and melt-rock reaction owing to upward penetrative flow of intercumulus melt. |
| WOS关键词 | TRACE-ELEMENT ; UPWELLING MANTLE ; ROCK REACTION ; CRUST ; DIFFUSION ; OLIVINE ; CRYSTALLIZATION ; PLAGIOCLASE ; CONSTRAINTS ; PERIDOTITE |
| 资助项目 | National Science Fund for Distinguished Young Scholars[42025201] ; National Key Research and Development Project of China[2020YFA0714801] ; US National Science Foundation[OCE-1637130] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000697771500004 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; US National Science Foundation ; US National Science Foundation ; US National Science Foundation ; US National Science Foundation ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; US National Science Foundation ; US National Science Foundation ; US National Science Foundation ; US National Science Foundation ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; US National Science Foundation ; US National Science Foundation ; US National Science Foundation ; US National Science Foundation ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; US National Science Foundation ; US National Science Foundation ; US National Science Foundation ; US National Science Foundation |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102682]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Zhang, Wei-Qi |
| 作者单位 | 1.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 2.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Wei-Qi,Dick, Henry J. B.,Liu, Chuan-Zhou,et al. MORB Melt Transport through Atlantis Bank Oceanic Batholith (SW Indian Ridge)[J]. JOURNAL OF PETROLOGY,2021,62(6):35. |
| APA | Zhang, Wei-Qi,Dick, Henry J. B.,Liu, Chuan-Zhou,Lin, Yin-Zhen,&Angeloni, Linda M..(2021).MORB Melt Transport through Atlantis Bank Oceanic Batholith (SW Indian Ridge).JOURNAL OF PETROLOGY,62(6),35. |
| MLA | Zhang, Wei-Qi,et al."MORB Melt Transport through Atlantis Bank Oceanic Batholith (SW Indian Ridge)".JOURNAL OF PETROLOGY 62.6(2021):35. |
入库方式： OAI收割
来源：地质与地球物理研究所
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