Granites and metamorphic rocks of the areas between the Miers and Salmon valleys compared with those from the Taylor and Wright Valleys

The area between the Miers and Salmon Valleys were mapped in detail and sampled extensively to determine the relationship between basement intrusive and metamorphic rocks. Samples were used to provide a basis for a coherent nomenclature of some of the granitic rocks in the Dry Valley region. Samples were also collected from type areas of granites in the Taylor and Wright Valleys for comparison. Granite-marble contacts were sampled and mapped. Suitable outcrops of skarn were mainly restricted to the ridge crests where the exposures were relatively free of any scree cover. Samples were analysed with a mineralogical study to evaluate the thermal regime of skarn formation. Detailed petrological and microprobe studies were made on the granite-marble samples to determine the parameters (e.g. temperature, CO2 pressure, etc) involved in the formation of skarn and an investigation into the chemical and petrological relationship of the intrusives and specifically between a granite pluton and the enclosing metamorphic rocks was completed.

对迈尔斯谷（Miers）与萨蒙谷（Salmon）之间的区域开展了详细地质填图与系统性密集采样，以明确基底侵入岩与变质岩之间的成因联系。所采集的样品为干谷地区部分花岗岩类岩石构建统一的命名体系提供了依据。此外，还从泰勒谷（Taylor）与赖特谷（Wright）内的花岗岩标准产地采集了样品以供对比分析。对花岗岩-大理岩接触带进行了采样与地质填图。夕卡岩（skarn）的优质露头主要集中在山脊顶部，该区域的裸露岩体相对较少受碎石覆盖层影响。通过矿物学分析对样品开展测试，以评估夕卡岩形成时的热动力学条件。针对花岗岩-大理岩样品开展了详细的岩石学与电子探针（microprobe）研究，以明确夕卡岩形成所需的各项参数（如温度、二氧化碳分压等）；同时完成了针对侵入岩（尤其是花岗岩岩体（granite pluton）与其围限变质岩）的地球化学与岩石学成因关联研究。