Igneous Petrology of the New Skaergaard Stratigraphic Reference Column

新斯卡加德地层参考柱的火成岩岩石学EAR-0208075PI：Lesher PI 和他的同事们建立了一个新的高分辨率参考柱，该参考柱包含 1989-90 年 Platinova 勘探计划的钻芯和 2000 年夏季通过 GPS 收集和定位的地表样本的斯卡加德侵入层状系列。这是美国和丹麦科学家与美国科学家合作完成的。学生。斯卡尔加德分化一直备受争议，除非对这些问题提出新的基本观察，否则意见分歧可能会继续存在。该提案的主要目标是使用完善的岩石学和分析工具记录这套先前收集的钻芯和表面样本的地层控制套件的岩石学和地球化学。这种复合地层柱将为对斯卡尔加德演化机制进行严格的假设检验提供基础，而在缺乏良好的地层控制的情况下，岩石学家一直无法进行这种假设检验。主要产品将是采样间隔为 10 m 及以下的详细矿物学和化学地层学。观测结果将与控制结晶岩浆行为及其液体下降线的物理因素的分析联系起来。这将为评估斯卡尔加德和其他层状火成岩侵入体的晶体沉积、原位结晶、压实和渗透交代作用提供基础。

Igneous Petrology of the New Skaergaard Stratigraphic Reference ColumnEAR-0208075PI: Lesher The PI and his colleagues have established a new high-resolution reference column of the layered series of the Skaergaard intrusion from drill core from the Platinova exploration program in 1989-90 and surface samples collected and located by GPS during the summer of 2000. This was done as a collaboration between U.S. and Danish scientists, and students. Skaergaard differentiation has been highly controversial and the divergence of opinions is likely to remain unless new fundamental observations are brought to bear on the problems. The primary objective of this proposal is to document the petrology and geochemistry of this stratigraphically controlled suite of previously collected drill core and surface samples using well established petrographical and analytical tools. This composite stratigraphic column will provide a basis for rigorous hypothesis testing of the mechanisms of Skaergaard evolution that have eluded petrologists in the absence of good stratigraphic control. The main product will be a detailed mineralogical and chemical stratigraphy at a sampling interval of 10 m and less. Observations will be linked to the analysis of the physical factors that govern the behavior of the crystallizing magma and its liquid line of descent. This will provide the foundation for evaluating the roles of crystal sedimentation, in-situ crystallization, compaction, and infiltration metasomatism at Skaergaard and other layered igneous intrusions.