COLLABORATIVE RESEARCH: Tectonothermal Evolution during Collisional Orogenesis: Blueschist to Granulite facies Metamorphism in the Kigluaik Mountains, Alaska

合作研究：碰撞造山作用期间的构造热演化：阿拉斯加基格鲁艾克山脉的蓝片岩到麻粒岩相变质作用

• 批准号: 9118394
• 负责人: Brian Patrick
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-02-01 至 1995-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9118394&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Tectonothermal; Evolution; during

The Kigluaik Mountains in Alaska contain a granulite facies (high-temperature) metamorphic overprint on relatively cool, high pressure, epidote-blueschist rocks. Two competing hypotheses for this juxtaposition are (1) that it represents an extensional metamorphic core complex with a pronounced structural break between the different grade rocks, and (2) that the high temperature meta- morphism formed in response to thermal re-equilibration of thickened crust with no structural break. This study will directly test the second hypothesis by an integrated program of field work, petrology and geochronology. It will also evaluate heat transport mechanisms for the high grade rocks. The results will provide important constraints on the thermal history of deep seated parts of orogens immediately post-collision, and will thus have wide tectonic significance.

阿拉斯加的基格鲁艾克山脉在相对凉爽、高压的绿帘石蓝片岩上含有麻粒岩相（高温）变质叠印。对于这种并置，有两个相互竞争的假设：（1）它代表了一个伸展的变质核杂岩，不同等级的岩石之间有明显的结构断裂；（2）高温变质作用是由于无结构断裂的增厚地壳的热重新平衡而形成的。这项研究将通过现场工作、岩石学和地质年代学的综合项目直接检验第二个假设。它还将评估高品位岩石的热传输机制。这些结果将为碰撞后造山带深部的热历史提供重要的约束，因此具有广泛的构造意义。