Primitive Mafic Magmas of the Central Andes

安第斯山脉中部的原始镁铁质岩浆

• 批准号: 9508023
• 负责人: Suzanne Kay
• 金额: $ 4万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-07-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9508023&HistoricalAwards=false
• 关键词: Primitive; Mafic; Magmas; Central; Andes

9508023 Kay One of the big stumbling blocks in understanding Central Andean magmatic source regions has been the lack of chemical constraints from primitive, mantle-derived basalt. Analyses from basalts of this type have been touted as the required ingredient in making progress. Within this framework, the recent discovery of two Pleistocene primitive basaltic lavas is extremely significant. The major objective of this project is to collect and "completely" analyses a suite of the mafic lavas outcropping in the southern Central Volcanic Zone. Mapping and sampling is being supported by Chilean and Argentine agencies in collaboration with South American colleagues Mpodozis and Coira. A "complete" analyses means determining a full range of major and trace element by INAA, ICP-MS, XRF and microprobe techniques, as well as Pb, Nd and Sr isotopes. These analyses will fill an important gap in compilations of primitive mafic lavas in arcs and provide a basis for beginning to unravel the complex mantle processes occurring beneath the thickened Andean Crust.

9508023 Kay 了解安第斯山脉中部岩浆源区的一大障碍是缺乏来自原始地幔玄武岩的化学约束。 对此类玄武岩的分析被认为是取得进展的必要因素。 在这个框架内，最近发现的两处更新世原始玄武岩熔岩具有极其重要的意义。 该项目的主要目标是收集并“完全”分析中南部火山带露头的一组镁铁质熔岩。 智利和阿根廷机构与南美同事 Mpodozis 和 Coira 合作，支持测绘和采样。 “完整”分析意味着通过 INAA、ICP-MS、XRF 和微探针技术以及 Pb、Nd 和 Sr 同位素测定全范围的主要和微量元素。 这些分析将填补弧形原始镁铁质熔岩汇编中的一个重要空白，并为开始揭示加厚的安第斯地壳下方发生的复杂地幔过程提供基础。