Chemical Interactions Between Gabbros and Their Host Rocks: Field and Laboratory Studies of the Tertiary Macrodikes of the Kangerdlugssuaq Area, East Greenland

康格尔德卢格苏瓦克地区第三纪辉长岩脉， 东格陵兰，提供研究的产品，一个自然的 化学和物理过程实验 当镁铁质岩浆与围岩结合时就会发生这种情况。 结合了极好的冰川高山露头，结构 地形起伏1公里，实地关系的良好背景研究 和火成岩岩石学（包括Wager的经典著作， 鹿，和其他人对Skaergaard入侵）使这一点， 理想的学习场所。 应该可以确定 批发与选择性竞争假设的检验 化学污染。 化学相互作用的机制 混合岩浆的混合机制可以由 直接观察丰富的、非常干净的露头。 建议使用多学科阵列， 方法包括野外、地球化学、同位素和实验 测试辉长岩被选择性地 受再活化的硅铝质基底和热液的污染 蚀变玄武岩围岩 将使用地球化学数据 评估现有的同化模型-分数 结晶，并在必要时完善这些模型。 的 结果应该实质性地帮助理解物理学， 地壳污染的化学过程， 地球化学特征的精确解释 大陆火山岩及其推论 陆下地幔的性质

The Tertiary gabbroic dikes of the Kangerdlugssuaq region, East Greenland, offer for study the products of a natural laboratory experiment on the chemical and physical processes that occur when mafic magmas incorporate blocks of wall rocks. A combination of superb glaciated alpine outcrops, structural relief of 1 km, and good background studies of field relations and igneous petrology (including the classic work of Wager, Deer, and others on the Skaergaard Intrusion) make this an ideal study area. It should be possible to make a definitive test of the competiting hypotheses of wholesale vs. selective chemical contamination. The mechanisms of chemical interaction and mechanics of mixing hybrid magmas may be determined by direct observation of the abundant, remarkably clean outcrops. It is proposed to use a multi-disciplinary array of methods including field, geochemical, isotopic, and experimental techniques to test the hypothesis that gabbros were selectively contaminated by remobilized sialic basement and hydrothermally altered basalt wall rocks. The geochemical data will be used to evaluate existing models of assimilation - fractional crystallization and to refine such models, if necessary. The results should materially aid understanding the physics and chemistry of crustal contamination, a process essential to the accurate interpretation of geochemical characteristics of continental volcanic rocks and consequent deductions regarding the nature of subcontinental mantle.