The Role of Fluids in Brittle Versus Ductile Deformation in the Whipple Mountains Metamorphic Core Complex

9316651莫里森最近的研究表明，在惠普尔山变质核杂岩地区的糜棱岩变形带中，大气降水可能渗透到了16公里深处。然而，现有的耗氧数据可以解释为：1)与脆性拆离断层有关的糜棱岩化后的大气水交换，同熔岩水向下渗透到韧性体制中的大气水交换，或3)脆性和韧性体制转换时下盘的流体-岩石交换。这一继续进行的项目将对具有不同变形历史的特征良好的样品中的矿物分离进行氧和氢同位素分析。结果将有助于区分流体在惠普尔山变质核杂岩发展中的可能性和对其作用的限制。

9316651 Morrison Recent studies have indicated that meteoric water may have penetrated to depths as great as 16 km in the zone of mylonitic deformation of the Whipple Mountain metamorphic core complex area. However, the existing oxygen depletion data can be interpreted to be due to either 1) post mylonitization meteoric water exchange related to brittle detachment faulting, syn-mylonitic exchange with meteoric water which penetrated downward into the ductile regime or 3) fluid-rock exchange in the lower plate at the transition between the brittle and ductile regimes. This continued project will produce oxygen and hydrogen isotopic analyses of mineral separates in well characterized samples with distinct deformational histories. Results will help discriminate between the possibilities and place constraints on the role of fluids in the development of the Whipple Mountain metamorphic core complex.