Mantle fluids in the San Andreas fault system, California
Mantle fluids in the San Andreas fault system, California
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DOI：
10.1126/science.278.5341.1278
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发表时间：
1997-11-14
期刊：
影响因子：
56.9
通讯作者：
Mariner, RH
中科院分区：
文献类型：
--
作者：
Kennedy, BM;Kharaka, YK;Mariner, RH
与圣安德烈亚斯和伴断层在中部和中南部加州的流体有很高的He-3/He-4的比例。氦同位素与流体化学或局部地质之间缺乏相关性，要求流体从地幔进入断层系统。地幔流体通过韧性下地壳必须进入脆性断裂带或附近的岩石静力学压力的基础上，氦同位素的流体通量的估计表明，它们可能因此直接有助于断层弱化高流体压力在孕震深度。
Fluids associated with the San Andreas and companion faults in central and southcentral California have high He-3/He-4 ratios. The lack of correlation between helium isotopes and fluid chemistry or local geology requires that fluids enter the fault system from the mantle. Mantle fluids passing through the ductile lower crust must enter the brittle fault zone at or near lithostatic pressures; estimates of fluid flux based on helium isotopes suggest that they may thus contribute directly to fault-weakening high-fluid pressures at seismogenic depths.