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COLLABORATIVE RESEARCH: Modern Geochronologic and Geochemical Techniques Applied to a Young Volcanic Field in an Active Continental Rift: The Potrillo Volcanic Field, NM

合作研究：现代地质年代学和地球化学技术应用于活跃大陆裂谷中的年轻火山田：新墨西哥州波特里洛火山田

基本信息

批准号：
9118869
负责人：
William McIntosh
金额：
$ 2.65万
依托单位：
New Mexico Institute of Mining and Technology
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：
1992-01-15 至 1994-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9118869&HistoricalAwards=false
关键词：
COLLABORATIVE RESEARCH Modern Geochronologic Geochemical

项目摘要

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.

该项目结合了地质年代学、古地磁学和新南威尔士州Potrillo火山区的地球化学研究墨西哥这个年轻的（马）领域位于活跃的里约大裂谷，是由一系列的马雷和几个数百个镁铁质流。地质年代学方法将包括40 AR/39 Ar，铀系不平衡和地表暴露（3 He）测年。岁这三种方法的限制重叠，从而允许一个很好的有机会为该领域制定一个强大的年表，同时还测试每种方法的内部一致性。系列流保存了大量的高保真记录，地磁场。一个密集的古地磁采样制度，结合时间顺序研究，将用于确定和日期的高振幅地磁漂移的地球磁场与轴向偶极假说的检验，古地磁学的一个原则，它假设地磁场随时间的推移平均为地心轴偶极子。这些研究，结合微量元素和岩石学特征，流量，将提供洞察率的物理和内部的化学演化和喷发旋回非常年轻并作为目前活跃的爆炸物的范例火山活动在全球范围内产生大气气溶胶。