Geochemistry and U-Pb Zircon Geochronology of the Central Mexican Lower Crust

1989年5月，在国家科学基金会赞助的捕虏体调查中， 产于墨西哥中部的玄武岩鲁尔研究生格雷格 池，和我们的墨西哥同事豪尔赫阿兰达戈麦斯访问了两个 中部下地壳捕虏体的主要产状 墨西哥 对每个通风口进行了详细调查， 壳幔捕虏体的空间丰度及尝试 对捕虏体类型的相对丰度进行了量化 根据手工取样观察， 阿兰达-戈麦斯将 继续这项统计工作的岩相研究， 墨西哥国立大学用小的薄片 50-60个代表性地壳捕虏体的碎片。 这 这个项目构成了格雷格·普尔的上午论文主题。 资金 这笔赠款将支持他在秋季学期，因为他 完成他的论文。 这笔资金将提供 仪器中子附加微量元素分析 activation. U-Pb年代学研究将 集中在几个正片麻岩捕虏体中的锆石， 通风口

In may 1989, during NSF-sponsored investigations of the xenolith- bearing basanites of central Mexico, Luhr, graduate student Greg Pool, and our Mexican colleague Jorge Aranda-Gomez visited two of the principal localities of lower-crustal xenoliths in central Mexico. Each vent was investigated in detail with regard to the spatial abundance of crustal and mantle xenoliths, and attempts were made to quantify the relative abundances of xenolith types in outcrop based on hand-sample observations. Aranda-Gomez will continue with this statistical work in a petrographic study at the Mexican National University using thin sections from small fragments of 50-60 representative crustal xenoliths. This project constitutes the A.M. thesis topic of Greg Pool. Funds from this grant will support him for the fall semester as he completes his thesis. Funds provided by this grant will provide additional trace element analyses by instrumental neutron activation. U-Pb geochronological investigations will concentrate on zircons in several orthogneiss xenoliths from each vent.