Uplift and Exhumation of Eclogites and Blueschists in Venezuela: Constraints Based on Structural Analysis, Geothermobarometry, and Geochronology

委内瑞拉榴辉岩和蓝片岩的隆起和折返：基于结构分析、地温气压测量和地质年代学的约束

• 批准号: 9304377
• 负责人: Hans Ave Lallemant
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-06-01 至 1996-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9304377&HistoricalAwards=false
• 关键词: Uplift; Exhumation; Eclogites; Blueschists; Venezuela

The uplift and exhumation of high pressure rocks in orogenic zones is a long-standing problem. A new hypothesis for the uplift and exhumation of blueschists and eclogites has been developed in this project on the basis of structural analysis of Late Cretaceous subduction complex in eastern Venezuela. The observation that these rocks had undergone large extensional strains parallel to the arcuate trend of the subduction zone and the volcanic arc led to a model in which oblique plate convergence changes required large arc-parallel extension and considerable forearc thinning. This renewal will test several aspects of this new model by dating the deformation sequence and determine the pressure-temperature history of particularly the lower grade rocks of the complex, and compare the results to the predictions of the model. Results are expected to test this possible mechanism of returning high pressure rocks to the earth's surface.

青藏高原高压岩石的隆升和折返 造山带是一个长期存在的问题。 一个新的假设 蓝片岩和榴辉岩的抬升和折返 在本项目中， 鄂尔多斯盆地晚白垩世俯冲杂岩构造分析 委内瑞拉东部。 这些岩石的观察结果 经历了平行于弓形的大的伸展应变 俯冲带和火山弧的走向导致了 斜向板块会聚变化模型 大弧平行延伸和可观的前弧 变薄 这次更新将测试这几个方面 新模式，确定变形序列， 特别是较低温度的压力-温度历史 等级岩石的复杂，并比较结果， 模型的预测。 预计结果将验证这一点 可能的机制返回高压岩石 地球表面。