Evolution of magma storage conditions along the track of Yellowstone Hotspot: investigation of the volcanic rocks from Snake River Plain

黄石热点沿线岩浆储存条件的演变：蛇河平原火山岩的调查

基本信息

批准号：
166774912
负责人：
Professor Dr. Francois Holtz, Ph.D.
金额：
--
依托单位：
Institut für Mineralogie
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/166774912?language=en
关键词：
Evolution magma storage conditions along

项目摘要

The planed ICDP drilling in the Snake River Plain volcanic province (western United States) is aimed to trace the Snake River Plain – Yellowstone (SRPY) hotspot and its interaction with the lithosphere. This province represents one of the best examples of a thermal anomaly related to hotspot volcanism within the continental lithosphere. Over the last 15 Ma, the SRPY-hotspot migrated ca. 600 km eastwards resulting in a bimodal (rhyolitic-basaltic) magmatism. Understanding the interaction of the SRPY-hotspot with the lithosphere requires information on the evolution of chemistry, sources, differentiation and storage conditions of both the rhyolitic and basaltic magmas with time and space. The proposed project aims at understanding the evolution of the magma storage conditions in the SRPY-province in the last 12 Ma. This information will be gained (1) from the chemical analysis of natural minerals and glasses combined with (2) high pressure experimental studies to determine phase equilibria and (3) thermodynamic modeling. Particular attention will be given to trace the evolution of the depth and temperature of the rhyolitic magma chambers using the Bruneau-Jarbidge and Heise volcanic centers (12.5-8.0 Ma and 6.5-4.3 Ma, respectively) as reference materials. Concomitantly, the storage conditions of basaltic lavas of different ages will be explored. The results will also be useful to understand the interactions between basaltic and rhyolitic magma chambers at depth, to constrain the conditions prevailing during partial melting processes in the crust, and to discuss the vertical migration distance of rhyolitic melts (magmas) from the source to the magma chamber. This work will benefit from the cooperation with petrologists and geochemists from USA (e.g., E. Christiansen, B. Nash, J. Shervais).

在蛇河平原省（美国西部）的策划ICDP钻探旨在追踪蛇河平原 - 黄石（Srpy）热点及其与岩石圈的相互作用。该省代表了与连续岩石圈中与热点火山相关的热异常的最佳例子之一。在过去的15个MA中，Srpy-hotspot迁移了Ca。向东600公里，导致双峰（流纹岩岩）岩浆作用。了解SRPY-HOTSPOT与岩石圈的相互作用需要有关节奏和基本岩浆的化学，来源，分化和储存条件的信息以及时间和空间。拟议的项目旨在了解过去12 MA中SRPY-Province岩浆存储条件的演变。将从天然矿物质和玻璃与（2）高压实验研究结合的化学分析中获得此信息（1），以确定相等和（3）热力学建模。将特别注意使用Bruneau-Jarbidge和Heise火山中心（分别为12.5-8.0 MA和6.5-4.3 Ma）作为参考材料，追踪流纹岩浆腔的深度和温度的演变。随之而来的是，将探索不同年龄段的玄武岩熔岩的存储条件。结果也将有助于了解深度的玄武岩和节奏岩浆腔之间的相互作用，以限制外壳中部分熔化过程中普遍存在的条件，并讨论从源到岩浆腔室的流纹岩熔体（岩浆）的垂直迁移距离。这项工作将受益于与美国的岩石学家和地球化学家的合作（例如E. Christiansen，B。Nash，J。Shervais）。