Igneous Petrology of the New Skaergaard Stratigraphic Reference Column

PI和他的同事利用1989- 1990年Platinova勘探项目的岩心和2000年夏季通过GPS采集和定位的地表样品，建立了一个新的高分辨率的skaerggaard侵入层序参考柱。这是由美国和丹麦的科学家以及学生合作完成的。skaergard分化一直备受争议，除非新的基本观察对这些问题产生影响，否则意见分歧可能会继续存在。本提案的主要目的是利用成熟的岩石学和分析工具，记录地层控制的钻孔岩心和地表样品的岩石学和地球化学。这种复合地层柱将为严格的斯卡加德演化机制的假设检验提供基础，在缺乏良好的地层控制的情况下，岩石学家一直在逃避这一假设。主要成果将是详细的矿物学和化学地层学，采样间隔为10米或更少。观测将与控制结晶岩浆及其液体下降线行为的物理因素的分析联系起来。这将为评价skaerggaard和其他层状火成岩侵入体的结晶沉积、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.