Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole
Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole
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DOI：
10.1029/2006gl027285
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发表时间：
2006-11
影响因子：
5.2
通讯作者：
J. Solum;S. Hickman;D. Lockner;D. Moore;B. A. van der Pluijm;A. Schleicher;James P. Evans
中科院分区：
文献类型：
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作者：
J. Solum;S. Hickman;D. Lockner;D. Moore;B. A. van der Pluijm;A. Schleicher;James P. Evans
清洗的岩屑提供了在圣安德烈亚斯深部断层观测站(SAFOD)主孔钻探过程中遇到的岩石的连续记录。原岩和断层岩都表现出各种各样的矿物组合，反映了岩性、P-T条件、变形机制以及流体成分和丰度的某些组合的变化。以断层为边界的明显新矿化区域可能记录与受断层限制的流体储集层有关的蚀变。此外，还发现了混层状的蒙脱石和蛇纹石矿物，它们与在钻探过程中相交的圣安德烈亚斯断层的活动线条有关，尽管它们对流变的影响尚不完全清楚。含有这些矿物相的断层是在2007年夏季SAFOD钻探第三阶段期间进行连续取心的主要候选者。
Washed cuttings provide a continuous record of the rocks encountered during drilling of the main hole of the San Andreas Fault Observatory at Depth (SAFOD). Both protolith and fault rocks exhibit a wide variety of mineral assemblages that reflect variations in some combination of lithology, P‐T conditions, deformation mechanisms, and fluid composition and abundance. Regions of distinct neomineralization bounded by faults may record alteration associated with fluid reservoirs confined by faults. In addition, both smectites occurring as mixed‐layer phases and serpentine minerals are found in association with active strands of the San Andreas Fault that were intersected during drilling, although their rheological influence is not yet fully known. Faults containing these mineralogical phases are prime candidates for continuous coring during Phase 3 of SAFOD drilling in the summer of 2007.