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Crust-scale reactive porous flow revealed by the brown amphibole in the IODP hole U1473A gabbros, Southwest Indian Ridge

文献类型：期刊论文

作者Zhang, Wei-Qi1; Liu, Chuan-Zhou1,2,3
刊名LITHOS
出版日期2023-08-01
卷号450页码:16
关键词Brown amphibole Reactive porous flow Lower oceanic crust Oceanic gabbro Atlantis Bank Southwest Indian Ridge
ISSN号0024-4937
DOI10.1016/j.lithos.2023.107209
英文摘要Mid-ocean ridge magma reservoirs are mush-dominated systems, where reactive porous flow is a dominant postcumulus process. However, the length scale of this process is poorly constrained, especially in ultraslowspreading ridges. Here, we seek to address this question by presenting a comprehensive brown amphibole dataset of gabbros in IODP Hole U1473A drilled on the Atlantis Bank ocean core complex, Southwest Indian Ridge (SWIR). The results suggest a magmatic origin of the brown amphiboles. Intra-grain chemical variations and compositional zoning of these amphibole grains suggest they were crystallized in a closed system. Nevertheless, geochemical modelings indicate the remarkable Zr/Nd ratio variations in brown amphibole can only be explained by assimilation-fractional crystallization processes triggered by the reactive porous flow. Thus, the brown amphibole in olivine gabbros was crystallized from trapped melts residual after earlier melt-mush interaction. In this light, the reactive porous flow should have ceased prior to the brown amphibole precipitation. This, in turn, suggests the stratigraphic variations in amphibole trace elements reflect the final-stage reactive melt migration. The stratigraphic variations in amphibole trace elements reflect a major episode of reactive melt migration through an similar to 800-m section upwardly. This implies that the porosity of the entire gabbroic section remained connected, providing a minimum estimate of the size of the melt-present zones in the lower oceanic crust during the spreading of the 57-60 degrees E magmatic segment of SWIR. Our study reveals that largescale reactive porous flow can occur in the magmatic segments of ultraslow-spreading ridges, and has important implications for the thermal and rheological evolution of the lower oceanic crust.
WOS关键词LOWER OCEANIC-CRUST ; DEFORMATION MECHANISM MAPS ; TRACE-ELEMENT ; MAGMA CHAMBER ; ATLANTIS BANK ; MELT ; CRYSTALLIZATION ; FELDSPAR ; INSIGHTS ; BENEATH
资助项目National Natural Science Foundation of China[42203050] ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences[XDB42020301] ; China Postdoctoral Science Foundation[2021M703197]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:001002443300001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; Strategic Priority Research Program of the Chinese Acad- emy of Sciences ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
源URL[http://ir.iggcas.ac.cn/handle/132A11/111206]  
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.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Wei-Qi,Liu, Chuan-Zhou. Crust-scale reactive porous flow revealed by the brown amphibole in the IODP hole U1473A gabbros, Southwest Indian Ridge[J]. LITHOS,2023,450:16.
APA Zhang, Wei-Qi,&Liu, Chuan-Zhou.(2023).Crust-scale reactive porous flow revealed by the brown amphibole in the IODP hole U1473A gabbros, Southwest Indian Ridge.LITHOS,450,16.
MLA Zhang, Wei-Qi,et al."Crust-scale reactive porous flow revealed by the brown amphibole in the IODP hole U1473A gabbros, Southwest Indian Ridge".LITHOS 450(2023):16.

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来源：地质与地球物理研究所

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