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

合作研究：地壳岩浆室的化学多样性：深成和火山见解的综合

• 批准号: 9805154
• 负责人: John Eichelberger
• 金额: $ 11.51万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-15 至 2000-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9805154&HistoricalAwards=false
• 关键词: Collaborative; Research; Chemical; Diversity; Crustal

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?

9805154 Eichelberger/Faust富兰克林马歇尔学院和阿拉斯加大学费尔班克斯费尔班克斯分校之间的这项合作研究的主要目标是了解复合岩浆房中导致成分分层、岩浆包体和混合的过程。该方法的目的是调和显然相互冲突的见解从深成研究的岩浆房过程的见解从研究的活火山系统。将在深成系统和火山系统的可比过程之间建立具体联系，例如，了解岩浆包体的形成和命运。该研究将涉及现场，岩石学和地球化学研究的岩浆杂岩，其中同生的深成岩和火山岩发生：（1）志留纪复杂的Vinalhaven，缅因州，（2）中新世复杂的Unalaska岛，阿拉斯加。 分析工作也将进行复合晚全新世火山系统，在包体，宿主熔岩和熔融包裹体中的玻璃的原始特性可以被利用来跟踪岩浆相遇过程中的熔融历史。这项工作涉及两个更广泛的问题。一个是触发爆发和随后的爆发行为的问题（爆发与溢出）-输入如何影响输出？ 第二个问题是火成岩成因的经典问题的一部分--大体积喷发产物和深成岩中化学不均匀性的原因是在源岩或主岩浆房的原地分异中寻找的，还是在更深的单独岩浆源中寻找的？