DOI: 10.1016/j.epsl.2018.08.054
Scopus记录号: 2-s2.0-85053036417
论文题名: Ridge propagation, oceanic core complexes, and ultramafic-hosted hydrothermalism at Rainbow (MAR 36°N): Insights from a multi-scale magnetic exploration
作者: Dyment J. ; Szitkar F. ; Levaillant D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 502 起始页码: 23
结束页码: 31
语种: 英语
英文关键词: hydrothermal processes
; magnetics
; mantle outcrops
; non-transform discontinuities
; slow-spreading centers
Scopus关键词: Magnesite
; Magnetic prospecting
; Magnetite
; Surface waters
; Hydrothermal process
; magnetics
; mantle outcrops
; non-transform discontinuities
; slow-spreading centers
; Magnetism
; deformation mechanism
; host rock
; hydrothermal activity
; hydrothermal system
; magnetic anomaly
; magnetic survey
; magnetite
; mantle structure
; oceanic lithosphere
; spreading center
; ultramafic rock
; Atlantic Ocean
; Rainbow Hydrothermal Field
英文摘要: A high-resolution magnetic survey conducted over the apparently inactive ultramafic-hosted hydrothermal site Clamstone reveals a positive magnetic anomaly, in accordance with the magnetic response of other ultramafic-hosted sites known to date. Here this magnetic signature is mainly the result of in-place bulk-magnetized serpentinite underlying the site rather than any concentration of magnetite within the stockwork zone, the latter being probably negligible due to the limited fluid venting. Conversely, the nearby high-temperature active ultramafic-hosted hydrothermal site Rainbow illustrates the key contribution of hydrothermal activity in producing large amounts of magnetite in stockwork zones within ultramafics. At a larger scale, we propose from the analysis of sea-surface magnetic anomalies that the underlying Rainbow Hill has been formed as an oceanic core complex associated with the Amar Minor North segment, later dismantled by the northward propagation of the Amar Minor South segment and the coeval recession of the Amar Minor North segment. This model solves the apparent paradox of a high-temperature hydrothermal site sitting on an oceanic core complex usually associated with cold, poorly magmatic spreading environments: the core complex belongs to the cold, receding Amar Minor North segment whereas the heat fueling site Rainbow comes from the hot, propagating Amar Minor South segment. It also explains why the Rainbow Hill, although interpreted as an oceanic core complex, lacks the typical corrugations of such core complexes – the latter have been dismantled by the deformation associated with the northward propagation of the non-transform offset. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109657
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Institut de Physique du Globe, CNRS UMR 7154, Paris, France; JAMSTEC, Yokosuka City, Kanagawa 237-0061, Japan; Now at Geo-Resources, Singapore
Recommended Citation:
Dyment J.,Szitkar F.,Levaillant D.. Ridge propagation, oceanic core complexes, and ultramafic-hosted hydrothermalism at Rainbow (MAR 36°N): Insights from a multi-scale magnetic exploration[J]. Earth and Planetary Science Letters,2018-01-01,502