DOI: 10.1016/j.epsl.2018.08.025
Scopus记录号: 2-s2.0-85052885168
论文题名: Three-dimensional models of hydrothermal circulation through a seamount network on fast-spreading crust
作者: Lauer R.M. ; Fisher A.T. ; Winslow D.M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 501 起始页码: 138
结束页码: 151
语种: 英语
英文关键词: coupled modeling
; hydrothermal circulation
; low-temperature
; ridge flank
Scopus关键词: Aquifers
; Flow of fluids
; Heat flux
; Hydrogeology
; Structural geology
; Temperature
; Conductive cooling models
; Coupled modeling
; Crustal permeability
; Hydrologic parameters
; Hydrothermal circulation
; Low temperatures
; ridge flank
; Three-dimensional model
; Transport properties
; Cocos plate
; hydrothermal circulation
; hydrothermal fluid
; low temperature
; oceanic crust
; outcrop
; seafloor
; seamount
; three-dimensional modeling
; Costa Rica
英文摘要: We present results from three-dimensional, transient, fully coupled simulations of fluid and heat transport on a ridge flank in fast-spread ocean crust. The simulations quantify relationships between rates of fluid flow, the extent of advective heat extraction, the geometry of crustal aquifers and outcrops, and crustal hydrologic parameters, with the goal of simulating conditions similar to those seen on 18–24 M.y. old seafloor of the Cocos plate, offshore Costa Rica. Extensive surveys of this region documented a ∼14,500 km2 area of the seafloor with heat flux values that are 10–35% of those predicted from conductive cooling models, and identified basement outcrops that serve as pathways for hydrothermal circulation via recharge of bottom water and discharge of cool hydrothermal fluid. Simulations suggest that in order for rapid hydrothermal circulation to achieve observed seafloor heat flux values, upper crustal permeability is likely to be ∼10−10 to 10−9 m2, with more simulations matching observations at the upper end of this range. These permeabilities are at the upper end of values measured in boreholes elsewhere in the volcanic ocean crust, and higher than inferred from three-dimensional modeling of another ridge-flank field site where there is less fluid flow and lower advective power output. The simulations also show that, in a region with high crustal permeability and variable sized outcrops, hydrothermal outcrop-to-outcrop circulation is likely to constitute a small fraction of total fluid circulation, with most of fluid flow occurring locally through individual outcrops that both recharge and discharge hydrothermal fluid. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109666
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: Department of Geoscience, University of Calgary, Calgary, Alberta, Canada; Earth and Planetary Sciences Department, University of California, Santa Cruz, 95064, United States; Center for Dark Energy Biosphere Investigations, University of California, Santa Cruz, 95064, United States; GrowthIntel, 25-27 Horsell Road, London, N5 1XL, United Kingdom
Recommended Citation:
Lauer R.M.,Fisher A.T.,Winslow D.M.. Three-dimensional models of hydrothermal circulation through a seamount network on fast-spreading crust[J]. Earth and Planetary Science Letters,2018-01-01,501