Collaborative Research: Integrated Structural and Geochemical Investigation of Alternate Origins for 'Crack-Seal' Veins

合作研究：“裂缝封闭”矿脉替代起源的综合结构和地球化学研究

• 批准号: 0107064
• 负责人: Zachary Sharp
• 金额: $ 4.5万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-15 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0107064&HistoricalAwards=false
• 关键词: Collaborative; Research; Integrated; Structural; Geochemical

0107079 Wiltschko0107064 SharpBanded fibrous veins are common features in deformed rocks, and are classically interpreted to indicate operation of a crack-seal mechanism in which a crack event is immediately followed by a cement-precipitation event due to local pressure drop. However, recent results of mass-balance considerations have cast doubt on this being a valad mechanism. This project will examine the question of the formation of banded veins from a new perspective model that includes two simplifying processes - pressure exerted by growing crystals and geochemical self-organization whereby a nearly constant fluid composition at the vein-host walls leads to oscillations in precipitated species. A series of tests will be applied to veins sets using both geochemical/microthermometric data and textural information to understand chemical and mechanical processes responsible for these types of veins. Results will help improve understanding of vein formation and therefore their use in understanding the tectonic setting in which they formed.

0107079 Wiltschko0107064锐带状纤维脉是变形岩石的常见特征，通常被解释为裂缝密封机制的运行，其中裂缝事件紧接着是由于局部压降导致的水泥沉淀事件。 然而，最近的结果质量平衡的考虑投下了怀疑，这是一个valad机制。 该项目将从一个新的视角模型研究带状脉的形成问题，该模型包括两个简化过程-生长晶体施加的压力和地球化学自组织，其中脉宿主壁处几乎恒定的流体成分导致沉淀物质的振荡。 一系列的测试将适用于静脉集使用地球化学/显微测温数据和纹理信息，以了解化学和机械过程负责这些类型的静脉。 研究结果将有助于提高对矿脉形成的认识，从而有助于了解它们形成的构造环境。