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 |
DOI | 10.1130/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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