A Combined Structural-Petrological Analysis of the Origin and Role of Partial Melting in Orogens

造山带部分熔融的起源和作用的构造-岩石学联合分析

• 批准号: 9814669
• 负责人: Christian Teyssier
• 金额: $ 21.32万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-02-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9814669&HistoricalAwards=false
• 关键词: Combined; Structural; Petrological; Analysis; Origin

9814669Teyssier Partial melting in the core of orogens likely controls the rheology of the crust subsequent to crustal thickening. Geophysical observations suggest that the deep crust under active orogens, such as southern Tibet, is decoupled from the lithospheric mantle and the rigid upper crust. This deep crust probably has a low viscosity and is able to flow. This project is aimed at providing an observational database to these conceptual geodynamic models by study of migmatites associated with the Shuswap metamorphic core complex in the Canadian Cordillera. The work will determine the P-T time paths of the metamorphic rocks, locate partial melting on this path and determine pressure of emplacement. Textural and petrologic analysis will constrain the conditions of partial melting and will determine flow of the partially mullen crust from shape preferred orientations of minerals. Results will be useful in testing and refining models of orogenic collapse and extension.***

98146699teyssiersier在Orogens的核心中局部融化可能会控制地壳增厚后的地壳的流变学。 地球物理观察结果表明，在活性牛根（例如西藏）下的深层外壳与岩石圈地幔和刚性的上皮脱在一起。 这种深层外壳可能具有低粘度，并且能够流动。 该项目的目的是通过研究与加拿大山脉SHUSWAP变质核心复合物相关的MIGMATITE的研究为这些概念的地球动物模型提供观察数据库。 这项工作将确定变质岩石的P-T时间路径，在此路径上定位部分融化并确定增强压力。 纹理和岩石学分析将限制部分熔化的条件，并将确定部分Mullen地壳从矿物的形状优选方向流动。 结果将有助于测试和完善的造山学崩溃和延伸模型。***