Collaborative Research: Ar Geochronometry of Fault Rocks Associated with Ancient Earthquakes

[9805137]霍尔在许多地质调查中，特定断层的运动定年是一个普遍重要的资料，然而这些信息通常是间接获得的。这个问题在脆性油田尤其困难，因为一些基于同位素的系统是活跃的。这一建议解决了产生短暂的、由断层产生的摩擦融化的脆性断层的年代测定问题。我们的想法是确定一种方法，从伪水晶石中获得40Ar/39Ar年龄，避免许多潜在的错误（包括未熔化的源材料，熔体不平衡和分析过程中的反冲损失效应等）。如果成功，这种协议将在需要了解脆性断层运动时间的项目中具有广泛的实用性。

9805137 Hall Dating movement on specific faults is a pervasively important datum in many geologic investigations, however such information most commonly be obtained indirectly. This problem is particularly difficult in the brittle field as a few isotopic-based systems are active. This proposal tackles dating of brittle faults that produce a transient, fault-generated friction melt. The idea is to determine a methodology to obtain an 40Ar/39Ar age from pseudotachylite that avoids many of the potential errors (inclusion of un-melted source material, inequilbrium in melt and recoil loss effects during analysis, among others). If successful, such a protocol would have broad utility in projects requiring knowledge of the timing of brittle fault movements.