DOI: 10.1016/j.epsl.2017.11.035
Scopus记录号: 2-s2.0-85035109310
论文题名: Heat flow, morphology, pore fluids and hydrothermal circulation in a typical Mid-Atlantic Ridge flank near Oceanographer Fracture Zone
作者: Le Gal V. ; Lucazeau F. ; Cannat M. ; Poort J. ; Monnin C. ; Battani A. ; Fontaine F. ; Goutorbe B. ; Rolandone F. ; Poitou C. ; Blanc-Valleron M.-M. ; Piedade A. ; Hipólito A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 423
结束页码: 433
语种: 英语
英文关键词: heat flow
; hydrothermal circulation
; Mid-Atlantic Ridge flank
; morphology
; Oceanographer Fracture Zone
; pore water
Scopus关键词: Aquifers
; Flow measurement
; Fracture
; Heat transfer
; Mass transfer
; Morphology
; Sediments
; Structural geology
; Submarine geology
; Volcanic rocks
; Water
; Chemical compositions
; Conductive cooling models
; Fracture zone
; Heat and mass transfer
; Hydrothermal circulation
; Hydrothermal process
; Mid Atlantic Ridge
; Pore waters
; Flow measuring instruments
; fracture zone
; heat flow
; hydrothermal circulation
; marine sediment
; modeling
; morphology
; porewater
; Atlantic Ocean
; Mid-Atlantic Ridge
; Calluna vulgaris
英文摘要: Hydrothermal circulation affects heat and mass transfers in the oceanic lithosphere, not only at the ridge axis but also on their flanks, where the magnitude of this process has been related to sediment blanket and seamounts density. This was documented in several areas of the Pacific Ocean by heat flow measurements and pore water analysis. However, as the morphology of Atlantic and Indian ridge flanks is generally rougher than in the Pacific, these regions of slow and ultra-slow accretion may be affected by hydrothermal processes of different regimes. We carried out a survey of two regions on the eastern and western flanks of the Mid-Atlantic Ridge between Oceanographer and Hayes fracture zones. Two hundred and eight new heat flow measurements were obtained along six seismic profiles, on 5 to 14 Ma old seafloor. Thirty sediment cores (from which porewaters have been extracted) have been collected with a Kullenberg corer equipped with thermistors thus allowing simultaneous heat flow measurement. Most heat flow values are lower than those predicted by purely conductive cooling models, with some local variations and exceptions: heat flow values on the eastern flank of the study area are more variable than on the western flank, where they tend to increase westward as the sedimentary cover in the basins becomes thicker and more continuous. Heat flow is also higher, on average, on the northern sides of both the western and eastern field regions and includes values close to conductive predictions near the Oceanographer Fracture Zone. All the sediment porewaters have a chemical composition similar to that of bottom seawater (no anomaly linked to fluid circulation has been detected). Heat flow values and pore fluid compositions are consistent with fluid circulation in volcanic rocks below the sediment. The short distances between seamounts and short fluid pathways explain that fluids flowing in the basaltic aquifer below the sediment have remained cool and unaltered. Finally, relief at small-scale is calculated using variogram of bathymetry and compared for different regions affected by hydrothermal circulation. © 2017 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110121
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Institut de Physique du Globe de Paris, Sorbonne Paris Cité, UMR CNRS 7154, 1 rue Jussieu, Paris cedex 05, 75238, France; iSTeP, Université Pierre et Marie Curie, 4 place Jussieu, Paris cedex 05, 75252, France; Geosciences Environnement Toulouse, 14 Avenue Edouard Belin, Toulouse, 31400, France; Geosciences, IFP Energies nouvelles, 1-4 avenue de Bois-Préau, Rueil-Malmaison Cedex, 92852, France; Universidade Federal Fluminense, Niterói, Brazil; Museum National d'Histoire Naturelle, CP 48, 57 rue Cuvier, Paris cedex 05, 75231, France; School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom; Universidade dos Açores, Departamento de Geociências, Rua da Mãe de Deus, Ponta Delgada, 9501-801, Portugal
Recommended Citation:
Le Gal V.,Lucazeau F.,Cannat M.,et al. Heat flow, morphology, pore fluids and hydrothermal circulation in a typical Mid-Atlantic Ridge flank near Oceanographer Fracture Zone[J]. Earth and Planetary Science Letters,2018-01-01,482