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首页> 外文期刊>Geophysical Research Letters >Paleomagnetic reorientation of San Andreas fault observatory at depth (SAFOD) core
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Paleomagnetic reorientation of San Andreas fault observatory at depth (SAFOD) core

机译：圣安德烈亚斯断层天文台（SAFOD）岩心的古磁重取向

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We present a protocol for using paleomagnetic analysis to determine the absolute orientation of core recovered from the SAFOD borehole. Our approach is based on determining the direction of the primary remanent magnetization of a spot core recovered from the Great Valley Sequence during SAFOD Phase 2 and comparing its direction to the expected reference field direction for the Late Cretaceous in North America. Both thermal and alternating field demagnetization provide equally resolved magnetization, possibly residing in magnetite, that allow reorientation. Because compositionally similar siltstones and fine-grained sandstones were encountered in the San Andreas Fault Zone during Stage 2 rotary drilling, we expect that paleomagnetic reorientation will yield reliable core orientations for continuous core acquired from directly within and adjacent to the San Andreas Fault during SAFOD Phase 3, which will be key to interpretation of spatial properties of these rocks.
机译：我们提出了一种使用古磁分析确定从SAFOD井筒中回收的岩心的绝对方向的协议。我们的方法基于确定SAFOD第二阶段从大谷地序列中回收的点芯的主要剩余磁化方向，并将其方向与北美晚白垩世的预期参考磁场方向进行比较。热磁场和交变磁场的消磁都提供了相等分解的磁化强度，可能存在于磁铁矿中，从而允许重新定向。由于在第2阶段旋转钻探期间在圣安德烈亚斯断层带遇到了成分相似的粉砂岩和细粒砂岩，因此我们预计，在SAFOD阶段，直接从圣安德烈亚斯断层内部和邻近获取的连续岩心，古磁重新定向将产生可靠的岩心方向3，这将是解释这些岩石的空间特性的关键。

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