Collaborative Research: Chemical Diversity in Crustal Magma Chambers: Synthesis of Plutonic and Volcanic Insights

[805154] eichelberger / faust富兰克林马歇尔学院和阿拉斯加大学费尔班克斯分校合作研究的主要目标是了解复合岩浆室中导致成分分层、岩浆包地和杂交的过程。该方法旨在调和岩浆房过程的深成岩研究与活火山系统研究中明显相互矛盾的见解。将在深成岩和火山系统的类似过程之间建立具体的联系，例如，了解岩浆飞地的形成和命运。该研究将涉及对同生深成岩和火山岩发生的岩浆杂岩的野外、岩石学和地球化学研究：(1)缅因州维纳尔黑文的志留纪杂岩和(2)阿拉斯加乌纳拉斯卡岛的中新世杂岩。分析工作还将在全新世晚期的复合火山系统上进行，在那里，飞地、寄主熔岩和熔体包裹体中的玻璃的原始特征可以用来追踪岩浆相遇期间的熔体历史。这项工作涉及两个更广泛的问题。一个是引发喷发和随后的喷发行为的问题（爆炸性vs.喷涌式）——投入如何影响产出？第二个问题是火成岩成因的经典问题的一部分——大体积喷发产物和岩体的化学非均质性的原因是要在源室或寄主室的原位分异中寻找，还是要在更深的、独立的岩浆源中寻找？

9805154Eichelberger/FaustThe primary goal of this collaborative research between Franklin & Marshall College and the University of Alaska, Fairbanks is to understand processes in composite magma chambers that lead to compositional stratification, magmatic enclaves, and hybridization. The approach aims to reconcile the apparently conflicting insights from plutonic studies of magma chamber processes with insights from the study of active volcanic systems. Specific links will be established between comparable processes in plutonic and volcanic systems, for example, understanding the formation and fate of magmatic enclaves. The research will involve field, petrologic and geochemical studies of magmatic complexes where contemporaneous plutonic and volcanic rocks occur: (1) a Silurian complex on Vinalhaven, Maine, and (2) a Miocene complex on Unalaska Island, Alaska. Analytical work will also be conducted on composite late Holocene volcanic systems, where the pristine character of glasses in enclaves, host lavas, and melt inclusions can be exploited to trace melt histories during magmatic encounters. There are two broader problems upon which this work bears. One is the issue of the triggering of eruptions and subsequent eruptive behavior (explosive vs. effusive) - How does input influence output? The second is a part of the classic problem of igneous petrogenesis - Are the causes of chemical heterogeneity in large-volume eruption products and in plutons to be sought in in-situ differentiation in the source or host chamber, or in deeper, separate magma sources?