Testing Evolution Models for Garnet Peridotite in the Mantle and Crust during Orogenic Cycles

测试造山旋回期间地幔和地壳中石榴橄榄岩的演化模型

• 批准号: 0000937
• 负责人: Enrico Bonatti
• 金额: $ 9万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-01 至 2005-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0000937&HistoricalAwards=false
• 关键词: Testing; Evolution; Models; Garnet; Peridotite

0000937LangmuirThe presence in many orogens of presumably mantle-derived garnet peridotite in high-grade crustal material has remained difficult to understand, as continental crust was thought to be too buoyant to be subducted into the mantle, and correspondingly, mantle peridotite too dense to be intruded upward into continental crust. This project will utilize two occurrences of garnet peridotite in continental orogenic rocks in the Caledonian Orogen of Norway. Extensive isotopic data will be employed to test several possible models for these occurrences. Results should help explain the common but apparently anomalous occurrence of those rocks not only in the Norway examples, but in other similar orogens.

0000937朗缪尔 在许多造山带中，高级地壳物质中可能存在来自地幔的石榴橄榄岩，这一点仍然难以理解，因为大陆地壳被认为太浮力而无法俯冲到地幔中，相应地，地幔橄榄岩太致密而无法向上侵入大陆地壳。 该项目将利用挪威加里东造山带大陆造山岩中的两处石榴橄榄岩。 将利用大量同位素数据来测试这些事件的几种可能模型。 结果应该有助于解释这些岩石的常见但明显异常的现象，不仅在挪威的例子中，而且在其他类似的造山带中也是如此。