Tertiary Evolution of the North American Continental Lithosphere During the Transition from Subduction to Rifting: The Magmatic Record in Southern New Mexico

北美大陆岩石圈从俯冲到裂谷转变过程中的第三次演化：新墨西哥州南部的岩浆记录

• 批准号: 9117855
• 负责人: Nancy McMillan
• 金额: $ 8.96万
• 依托单位: New Mexico State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-06-01 至 1994-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117855&HistoricalAwards=false
• 关键词: Tertiary; Evolution; North; American; Continental

This project is to model the evolution of lithospheric and asthenospheric magma source regions during the tectonic transition of the Rio Grande Rift by examining the chemical, mineralogical, textural, and volcanological characteristics of volcanic suites produced episodically from 50 to 3 Ma in southern New Mexico. Major element, trace element, and isotopic (Sr, Nd, and Pb) compositions will provide constraints on the nature of magma-producing regions (asthenosphere, lithospheric mantle, lower crust, upper crust) as well as the processes involved in magma evolution. 40Ar/39Ar age determinations on key units will place temporal constraints on thermal evolution of the lithosphere.

该项目旨在模拟岩石圈的演化， 构造转型期软流圈岩浆源区 研究格兰德河裂谷的化学、矿物学 火山岩组的结构特征和火山学特征 在新墨西哥州南部，于50 ~ 3 Ma期间间歇性产生。 主量元素、微量元素和同位素（Sr、Nd和Pb） 组合物将提供对以下性质的限制： 岩浆生成区（软流圈、岩石圈地幔、下地幔 地壳，上地壳）以及岩浆所涉及的过程 进化 关键单元的40 Ar/39 Ar年龄测定将在 岩石圈热演化的时间限制。