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

本项目为为期两年的南加州莫哈韦沙漠中部和西部中生代深部岩石地球化学、年代学和同位素特征研究项目。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，提出了几条主要的走滑和逆冲断层穿过莫哈韦沙漠。这些断裂如果存在，将在中生代深部成矿作用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。所有主要的深成阶段都将在从莫哈韦沙漠西端到加利福尼亚州巴斯托东北部莫哈韦沙漠中北部的一个样带中进行研究。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)私家侦探和他的学生进行的详细测绘。这项研究的结果将对莫哈韦沙漠周边地区几个正在进行的主要项目的工人有用，包括内华达山脉南部、莫哈韦沙漠东部以及横向和半岛山脉。

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.