A Geochronologic, Geochemical, and Isotopic Study of MeszoicPlutonism in the Central and Western Desert

中西部沙漠中生代火成体的年代学、地球化学和同位素研究

• 批准号: 8917300
• 负责人: Allen Glazner
• 金额: $ 6万
• 依托单位: University of North Carolina at Chapel Hill
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-15 至 1992-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917300&HistoricalAwards=false
• 关键词: Geochronologic; Geochemical; Isotopic; Study; MeszoicPlutonism

This project is requested for a two-year investigation of the geochemical, geochronological, and isotopic characteristics of Mesozoic plutonic rocks from the central and western Mojave Desert of southern California. The main purpose of this study is to gather data that can be used to test models for the tectonic, magmatic, and paleogeographic evolution of southern California. For example, several major strike-slip and thrust faults are proposed to pass through the Mojave Desert. These faults, if present, should produce noticeable discontinuities in the age and isotopic character of Mesozoic plutonism. At present there are virtually no data that can be used to test these hypotheses. All major plutonic phases will be studied in a transect running from the western tip of the Mojave Desert to the north-central Mojave Desert northeast of Barstow, California. Sample collection will be based on (1) ongoing detailed mapping by coworkers in the central Mojave Desert, and (2) detailed mapping by the P.I. and his students. The results of this study will be useful to workers in several major ongoing projects in areas bordering the Mojave Desert, including the southern Sierra Nevada, the eastern Mojave Desert, and the Transverse and Peninsular Ranges.

该项目要求对南加州莫哈韦沙漠中西部中生代深成岩的地球化学、年代学和同位素特征进行为期两年的调查。这项研究的主要目的是收集可用于测试南加州构造、岩浆和古地理演化模型的数据。例如，几条主要的走滑和逆冲断层被提议穿过莫哈韦沙漠。这些断层如果存在，应该会在中生代深成岩的年龄和同位素特征上产生明显的不连续性。目前，几乎没有数据可以用来检验这些假设。所有主要的深成岩相将在从莫哈韦沙漠西端到加利福尼亚州巴斯托东北部的莫哈韦沙漠中北部的横断面上进行研究。样本收集将基于(1)莫哈韦沙漠中部同事正在进行的详细测绘，以及(2)P.I.和他的学生的详细测绘。这项研究的结果将对与莫哈韦沙漠接壤地区的几个正在进行的重大项目的工作人员有用，这些地区包括内华达山脉南部、莫哈韦沙漠东部以及横贯和半岛山脉。