西北印度洋脊的厘定及其地质构造特征

余星; 韩喜球; 邱中炎; 王叶剑; 唐立梅

doi:10.3799/dqkx.2018.136

Volume 44 Issue 2

Feb. 2019

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Yu Xing, Han Xiqiu, Qiu Zhongyan, Wang Yejian, Tang Limei, 2019. Definition of Northwest Indian Ridge and Its Geologic and Tectonic Signatures. Earth Science, 44(2): 626-639. doi: 10.3799/dqkx.2018.136

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Yu Xing, Han Xiqiu, Qiu Zhongyan, Wang Yejian, Tang Limei, 2019. Definition of Northwest Indian Ridge and Its Geologic and Tectonic Signatures. Earth Science, 44(2): 626-639. doi: 10.3799/dqkx.2018.136

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Definition of Northwest Indian Ridge and Its Geologic and Tectonic Signatures

doi: 10.3799/dqkx.2018.136

Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, SOA, Hangzhou 310012, China

Received Date: 2018-12-08
Publish Date: 2019-02-15

Abstract

Abstract

The existing nomenclatures for the ridge system of Northwest Indian Ocean include Carlsberg Ridge and Central Indian Ridge from north to south. The demarcation point between them is thought to be the intersection of Australia-Indian plate boundary and the ridge axis, which is yet poorly constrained. Based on the current knowledge of geological, geophysical and geochemical investigation and research results of the whole ridge segment, a new terminology for the ridge system of Northwest Indian Ocean is proposed, i.e. the Northwest Indian Ridge (NWIR). The whole ridge extends from Rodrigues Triple Junction to Owen transform fault, which includes Carlsberg Ridge and Central Indian Ridge, no matter where the boundary is. The new term may promote the thorough recognition of evolution history of Northwest Indian Ridge, as well as its geodynamic process. The Northwest Indian Ridge is especially full of faults in the middle segment but less on both ends, just like the shape of a straw and its bend is an analog for the turning point of the ridge. The gravity anomaly shows that the magma supplies at both ends are relatively abundant, while the magma in the middle part is rather limited. The magnetic anomaly in the Northwest Indian Ocean is zonated and indicates a multi-stage ridge spreading processes. Besides, the most prominent feature in petrogeochemistry is the presence of relatively isotopically enriched ridge basalts from two ridge segments, which may be related to the hotspot intervention and/or contamination of depleted asthenosphere by residual lithosphere or crustal materials.
- Northwest Indian Ridge,
- Carlsberg Ridge,
- Central Indian Ridge,
- mid-ocean ridge basalt,
- geotectonic characteristics,
- geochemistry

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