Data report: permeability, porosity, and frictional strength of core samples from IODP Expedition 366 in the Mariana forearc

C. Morrow, D. Moore, D. Lockner, B. Bekins
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引用次数: 1

Abstract

Core samples from International Ocean Discovery Program (IODP) Expedition 366 were tested in the laboratory to determine permeability, porosity, density, and frictional strength and their relation to mineralogy as part of an effort to understand hydromechanical processes at convergent plate margins. Seven samples were tested from a depth range of 19.6 to 197.9 m below seafloor. The samples were derived from three serpentinite mud volcanoes in the Mariana forearc region that formed where slab-derived fluids and materials ascend along faults. The physical characteristics mirror compositional differences between predominantly serpentine-rich and saponite-rich samples. Permeability values ranged from 10−17 to 10−19 m2, low enough to facilitate the formation of high fluid pressures that have been observed in the Mariana and other subduction megathrust environments. Porosity ranged from 0.37 to 0.51 and density ranged from 1.66 to 2.01 g/cm3. Serpentine-rich samples have coefficients of friction of 0.2–0.4, consistent with crustal serpentinite from a variety of fault zones, whereas saponite-rich samples have friction values less than 0.2, consistent with saponite fault gouge from the San Andreas Fault Observatory at Depth (SAFOD) drill hole in California (USA).
数据报告:渗透率、孔隙度和摩擦强度的岩心样品来自IODP远征366在马里亚纳前弧
国际海洋发现计划(IODP) 366远征队的岩心样本在实验室进行了测试,以确定渗透率、孔隙度、密度和摩擦强度及其与矿物学的关系,作为了解会聚板块边缘流体力学过程的一部分。七个样本在海底以下19.6至197.9米的深度范围内进行了测试。这些样品来自马里亚纳弧前区的三座蛇纹岩泥火山,这些火山形成于板块衍生的流体和物质沿断层上升的地方。物理特征反映了主要富含蛇纹石和富含皂矿的样品之间的成分差异。渗透率值范围为10 - 17 ~ 10 - 19 m2,低到足以促进在马里亚纳和其他俯冲大逆冲环境中观察到的高流体压力的形成。孔隙度范围为0.37 ~ 0.51,密度范围为1.66 ~ 2.01 g/cm3。富蛇纹石样品的摩擦系数为0.2 ~ 0.4,与来自不同断裂带的地壳蛇纹石相一致,而富皂石样品的摩擦系数小于0.2,与来自美国加利福尼亚州圣安德烈亚斯断层观测站(SAFOD)钻孔的皂石断层泥相一致。
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