Igneous Petrology of the New Skaergaard Stratigraphic Reference Column

新斯凯尔加德地层的火成岩岩石学参考柱EAR-0208075PI：Pi Lesher和他的同事们建立了一个新的高分辨率参考柱，该参考柱来自-90普拉蒂诺瓦勘探计划的钻芯，并于2000年夏天通过全球定位系统采集和定位了斯凯尔加德侵入岩的层状系列。这项研究是由美国和丹麦的科学家以及学生共同完成的。斯卡尔加德的区分一直备受争议，除非对这些问题进行新的基本观察，否则意见分歧可能仍然存在。这项提议的主要目标是利用成熟的岩石学和分析工具，记录这套先前收集的钻芯和地表样本的岩石学和地球化学。这一复合地层柱将为斯卡尔加德演化机制的严格假设检验提供基础，在缺乏良好的地层控制的情况下，岩石学家一直未能找到这些机制。主要产品将是详细的矿物学和化学地层学，采样间隔为10米或更短。观测将与分析控制结晶岩浆及其液体下降线行为的物理因素有关。这将为评价斯凯尔加德和其他层状火成岩的结晶沉积、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.