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
A. T. Fisher
中科院分区:
--
文献类型:
--
作者:
Bartetzko;A. T. Fisher

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我们编译和比较岩石物理数据从上洋壳孔U1301 B,在3.5马的胡安德富卡海岭东侧的海底。测量包括岩心规模(基于实验室)和现场(电缆)测量地层孔隙度、电阻率、体积密度、P波速度和伽马射线发射。U1301 B孔的数据与其他地点的数据(年龄范围为5.9 - 167 Ma)相比,显示出一些重要的差异。孔U1301 B样品往往有较低的体积密度值为一个给定的孔隙度比其他年轻的地壳网站。孔U1301 B样品也往往具有较高的地层系数值(流体传导率与饱和岩石传导率的比值),这可能表明曲折的微孔的发展,这与来自较老海底的样品更一致。对岩石物理性质与地壳年龄的全球趋势的评估表明,孔U1301 B原位数据与全球趋势一致,但核心尺度P波速度和体积密度值低于年轻地壳预测的全球趋势值。这最后一个观察结果可能与基底地形和区域暴露有关,直到最近,地点U1301周围的基底露头。直到该地区大部分暴露的基底被掩埋,热液循环提取了大部分岩石圈热量,保持基底流体温度较低,并限制了蚀变的速率和程度;随后的高温流体循环,更受限制,氧化条件更少,导致地壳岩石的蚀变增强和普遍。
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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