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  2. 地质与地球物理研究所
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  4. 岩石圈演化国家重点实验室
Shearing-enhanced deep fluid circulation induces seismic anisotropy in the lower crust at slow-spreading oceanic ridges

文献类型：期刊论文

作者Zhou, Baojun1; Liu, Junlai1; Yan, Jiaxin1; Hou, Chunru1; Chen, Xiaoyu1; Liu, Chuanzhou2; Wu, Fuyuan2
刊名GEOLOGY
出版日期2023-05-01
卷号51期号:5页码:465-470
ISSN号0091-7613
DOI10.1130/G50879.1
英文摘要Although long-lived detachment faulting plays an important role in fluid circulation and in accommodating tectonic extension at slow-spreading oceanic ridges, it is still unclear how the fluid-enriched faults contribute to the observed seismic anisotropy in the lower crust. We investigated sheared and altered gabbros along the detachment fault zones from the Xigaze ophiolite in the southern Tibetan Plateau. Results demonstrate that the positive feedback be-tween fluid circulation and shearing, linked by dissolution-precipitation creep of amphibole, resulted in fluid enrichment during strain localization along the fault zones. Based on this shearing-enhanced fluid circulation model, our calculations of the seismic properties show that amphiboles (de)formed by dissolution-precipitation creep along the fault zones largely contribute to the seismic anisotropy (P and S waves) and S-wave delay time in the lower crust at slow-spreading ridges, with the polarization directions of fast shear waves being subparallel to the ridges. The strength of resulting seismic anisotropy is largely a function of crustal thick-ness, fault zone attitude, and metasomatism intensity. This study provides a novel explanation for the origin of seismic anisotropy in the lower oceanic crust at slow-spreading ridges. The conclusion may also have implications for the origin of seismic anisotropy at fast-spreading ridges where there are high melt supplies.
WOS关键词XIGAZE OPHIOLITE TIBET ; EVOLUTION ; ICELAND ; GABBROS ; FAULTS ; CREEP ; PHASE ; SEA
资助项目National Natural Science Foundation of China[91955205] ; National Natural Science Foundation of China[41902203]
WOS研究方向Geology
语种英语
出版者GEOLOGICAL SOC AMER, INC
WOS记录号WOS:001007196700010
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 ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/111235]  
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Liu, Junlai
作者单位1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
2.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		 Zhou, Baojun,Liu, Junlai,Yan, Jiaxin,et al. Shearing-enhanced deep fluid circulation induces seismic anisotropy in the lower crust at slow-spreading oceanic ridges[J]. GEOLOGY,2023,51(5):465-470.
APA Zhou, Baojun.,Liu, Junlai.,Yan, Jiaxin.,Hou, Chunru.,Chen, Xiaoyu.,...&Wu, Fuyuan.(2023).Shearing-enhanced deep fluid circulation induces seismic anisotropy in the lower crust at slow-spreading oceanic ridges.GEOLOGY,51(5),465-470.
MLA Zhou, Baojun,et al."Shearing-enhanced deep fluid circulation induces seismic anisotropy in the lower crust at slow-spreading oceanic ridges".GEOLOGY 51.5(2023):465-470.

入库方式： OAI收割

来源：地质与地球物理研究所

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