Physical properties of young (3.5 Ma) oceanic crust from the eastern flank of the Juan de Fuca Ridge: Comparison of wireline and core measurements with global data
Physical properties of young (3.5 Ma) oceanic crust from the eastern flank of the Juan de Fuca Ridge: Comparison of wireline and core measurements with global data
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胡安德富卡海岭东侧年轻(3·5 Ma)洋壳的物理特性:电缆和岩心测量与全球数据的比较
DOI:
10.1029/2007jb005268
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发表时间:
2008
影响因子:
--
通讯作者:
A. T. Fisher
中科院分区:
文献类型:
--
作者:
Bartetzko;A. T. Fisher
We compile and compare petrophysical data from the upper oceanic crust in Hole U1301B, on 3.5 Ma seafloor on the eastern flank of the Juan de Fuca Ridge. Measurements include core‐scale (lab‐based) and in situ (wireline) measurements of formation porosity, electrical resistivity, bulk density,Pwave velocity, and gamma ray emission. A comparison between Hole U1301B data and those from other sites, ranging in age from 5.9 to 167 Ma, demonstrates some important differences. Hole U1301B samples tend to have lower bulk density values for a given porosity than do other young crustal sites. Hole U1301B samples also tend to have higher values of formation factor (the ratio of fluid conductivity to saturated rock conductivity), which may indicate development of tortuous microporosity that is more consistent with samples from older seafloor. Evaluation of global trends of petrophysical properties versus crustal age indicates that Hole U1301B in situ data is consistent with global trends, but core‐scalePwave velocity and bulk density values fall below global trend values predicted for young crust. This last observation is likely related to basement topography and the regional exposure, until relatively recently, of basement outcrops around Site U1301. Until most of the exposed basement in this area was buried, hydrothermal circulation extracted much of the lithospheric heat, kept basement fluid temperatures low, and limited the rate and extent of alteration; a subsequent period of higher‐temperature fluid circulation with more restricted and less oxidative conditions resulted in enhanced and pervasive alteration of crustal rocks.
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DOI:
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发表时间:
2000
期刊:
影响因子:
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作者:
P. Marescotti;D. Vanko;R. Cabella
通讯作者:
R. Cabella
DOI:
--
发表时间:
2008
期刊:
影响因子:
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A. Fisher
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1998
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DOI:
--
发表时间:
2002
期刊:
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作者:
R. Bartetzko;J.Wohlenberg
通讯作者:
J.Wohlenberg
DOI:
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发表时间:
1998
期刊:
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作者:
Igneous Units;C. Hole;T. Hirono;L. Abrams;T. Hirono
通讯作者:
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