Petrogenesis of Komatiitic Peridotites

科马提质橄榄岩的岩石成因

• 批准号: 9018938
• 负责人: C. Michael Lesher
• 金额: $ 5.03万
• 依托单位: University of Alabama Tuscaloosa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-01 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9018938&HistoricalAwards=false
• 关键词: Petrogenesis; Komatiitic; Peridotites

Geological, geochemical, and isotopic studies indicate that Archean komatiites at Kambalda, Western Australia, thermally eroded and assimilated crustal rocks during ascent. Similar komatiites occur in the Chukotat Group of the early Proterozoic Cape Smith belt in northern Quebec which are superbly exposed and only slightly metamorphosed. This project is to establish stratigraphic and petrogenetic relationships between the mineralized komatiitic peridotites and associated gabbros and basalts of the Chukotat Group, and determine the influence of thermal erosion and hybridization on the genesis of associated nickel sulfide mineralization. The project will involve detailed field mapping, relogging of selected diamond drill cores, whole- rock geochemical and Nd isotopic analysis, and S isotopic analysis of sulfide ores and sulfide sediments.

地质、地球化学和同位素研究表明，西澳大利亚Kambalda地区太古代科马长岩在上升过程中受到热侵蚀和同化。在加拿大魁北克省北部早元古代史密斯角带的Chukotat群中也发现了类似的科马铁矿，这些科马铁矿暴露程度极好，仅发生了轻微的变质作用。本项目旨在建立矿化的科马长质橄榄岩与楚科塔群伴生辉长岩、玄武岩的地层和成岩关系，确定热侵蚀和杂化作用对伴生硫化镍矿化成因的影响。该项目将包括详细的野外测绘、选定金刚石钻芯的重新测井、全岩地球化学和Nd同位素分析，以及硫化物矿石和硫化物沉积物的S同位素分析。