Rhenium-Osmium Systematics of the Bushveld Complex

Bushveld 杂岩的铼-锇系统学

• 批准号: 9406259
• 负责人: Joaquin Ruiz
• 金额: $ 7.78万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1996-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9406259&HistoricalAwards=false
• 关键词: Rhenium; Osmium; Systematics; Bushveld; Complex

9406259 Ruiz We propose to assess the effects of deuteric and hydrothermal fluids in PGE mineralization by using Os isotopes as a monitor of crustal interactions in the system. Bulk analyses by negative ionization mass spectrometry (NTIMS) will be performed on country rocks and crustal xenoliths, as possible representatives of the crustal component in the Bushveld. Re-Os analysis of PGE-enriched layers and adjacent silicates will also be obtained; preliminary results by inductively coupled plasma mass spectrometry (ICP-MS) show heterogeneities in these horizons, particularly where deuteric and hydrothermal effects are evident. But in situ Os isotope and PGE analysis of PGE phases by laser ablation ICP-MS are required to document the various inputs of these processes. The data obtained in this study will allow us to place some constraints on the magmatic, deuteric and hydrothermal contributions to PGE mineralization in the Bushveld Complex.

9406259 Ruiz我们建议用Os同位素作为系统中地壳相互作用的监测来评估氘和热液流体对PGE矿化的影响。负电离质谱（NTIMS）将对乡村岩石和地壳捕虏体进行大量分析，作为布什维尔德地壳成分的可能代表。富pge层和邻近硅酸盐的Re-Os分析也将得到；电感耦合等离子体质谱（ICP-MS）的初步结果显示了这些层位的非均质性，特别是在氘和热液效应明显的地方。但是，为了记录这些过程的各种输入，需要激光烧蚀ICP-MS对PGE相进行原位Os同位素和PGE分析。本研究获得的数据将使我们能够对Bushveld杂岩中岩浆、氘和热液对PGE矿化的贡献进行一些限制。