Collaborative Research: Modern Geochronologic Geochemical Techniques Applied to a Young Volcanic Field: The Potrillo Volcanic Field, New Mexico

该项目结合了新墨西哥州南部Potrillo火山场的地质年代学、古地磁和地球化学研究。这个年轻的（Ma）场位于活跃的里约热内卢大裂谷内，由一系列maare和数百个maic流组成。地质年代学方法将包括40AR/39Ar， u系列不平衡和地表暴露（3He）定年。这三种方法的年龄限制重叠，从而为该领域开发一个可靠的年表提供了绝佳的机会，同时也测试了每种方法的内部一致性。这一系列的流动保存了大量高保真的地磁场记录。结合年代学研究，将使用密集的古地磁取样制度来确定和确定地球磁场的高振幅地磁偏移的日期，并检验轴向偶极子假说，这是古地磁的一个原则，它假设地磁场随着时间的推移平均为地心轴向偶极子。这些研究，结合微量元素和岩石学特征的流动，将提供深入了解物理和化学演化的速度和爆发周期在这个非常年轻的领域，并作为目前活跃的爆炸性火山作用的范例，在全球范围内贡献大气气溶胶。

This project combines geochronologic, paleomagnetic and geochemical studies of this Potrillo Volcanic Field of southern New Mexico. This young (Ma) field is located within the active Rio Grande Rift and is composed of a series of maare and several hundred mafic flows. Geochronologic methods will include 40AR/39Ar, U-series disequilibria, and surface exposure (3He) dating. The age limits of these three methods overlap, thus allowing an excellent opportunity to develop a robust chronology for the field while also testing the internal consistency of each method. The series of flows preserve a large population of high fidelity records of the geomagnetic field. An intensive paleomagnetic sampling regime, in conjunction with the chronologic studies, will be used to identify and date high amplitude geomagnetic excursions of the Earth's magnetic field and to examine to axial dipole hypothesis, a tenet of paleomagnetism which assumes that the geomagnetic field averages to a geocentric axial dipole over time. These studies, combined with trace element and petrological characterization of the flows, will provide insight into the rates of physical and chemical evolution and the eruptive cyclicity within is very young field and serve as a paradigm for currently active explosive volcanism contributing atmospheric aerosols on a global basis.