DOI: 10.1002/2013GL058111
论文题名: Geophysical signatures of past and present hydration within a young oceanic core complex
作者: Blackman D.K. ; Slagle A. ; Guerin G. ; Harding A.
刊名: Geophysical Research Letters
ISSN: 0094-10347
EISSN: 1944-10078
出版年: 2014
卷: 41, 期: 4 起始页码: 1179
结束页码: 1186
语种: 英语
英文关键词: atlantis massif
; borehole geophysics
; IODP
; oceanic core complex
Scopus关键词: Geophysics
; Physical properties
; Atlantis massifs
; Borehole geophysics
; Conductive cooling
; Integrated ocean drilling programs
; IODP
; Mid Atlantic Ridge
; Oceanic core-complexes
; Seismic velocities
; Hydration
; borehole logging
; cooling
; geophysical method
; hydration
; lithosphere
; oceanic circulation
; physical property
; temperature effect
; ultramafic rock
; Atlantic Ocean
; Atlantis Massif
; Mid-Atlantic Ridge
英文摘要: Borehole logging at the Atlantis Massif oceanic core complex provides new information on the relationship between the physical properties and the lithospheric hydration of a slow-spread intrusive crustal section. Integrated Ocean Drilling Program Hole U1309D penetrates 1.4 km into the footwall to an exposed detachment fault on the 1.2 Ma flank of the mid-Atlantic Ridge, 30°N. Downhole variations in seismic velocity and resistivity show a strong correspondence to the degree of alteration, a recorder of past seawater circulation. Average velocity and resistivity are lower, and alteration is more pervasive above a fault around 750 m. Deeper, these properties have higher values except in heavily altered ultramafic zones that are several tens of meters thick. Present circulation inferred from temperature mimics this pattern: advective cooling persists above 750 m, but below, conductive cooling dominates except for small excursions within the ultramafic zones. These alteration-related physical property signatures are probably a characteristic of gabbroic cores at oceanic core complexes. Key Points Borehole T indicates shallow present circulation, conductive regime > 750 mbsf Narrow fault zones have seismic, T, resistivity signal indicating localized flow Hydration of gabbroic oceanic core complexes is limited below fault damage zone ©2014. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84894277348&doi=10.1002%2f2013GL058111&partnerID=40&md5=9fe1a3c18ea5913869faa9761fda7a78
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7611
Appears in Collections: 气候减缓与适应
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作者单位: Scripps Institution of Oceanography, San Diego CA, United States
Recommended Citation:
Blackman D.K.,Slagle A.,Guerin G.,et al. Geophysical signatures of past and present hydration within a young oceanic core complex[J]. Geophysical Research Letters,2014-01-01,41(4).