Cosmogenic 3 He exposure ages of basaltic flows from Miller Knoll, Panguitch Lake, Utah: Using the alternative isochron approach to overcome low-gas crushes
作者: David W. MarchettiAllen L. StorkD. Kip SolomonThure E. CerlingWil Mace
作者单位: 1Geology Program, Western Colorado University, 1 Western Way, Gunnison, CO, 81231, USA
2Department of Geology and Geophysics, University of Utah, 115 South 1400 East, Salt Lake City, UT, 84112, USA
刊名: Quaternary Geochronology, 2020, Vol.55
来源数据库: Elsevier Journal
DOI: 10.1016/j.quageo.2019.101035
关键词: CosmogenicHelium-3Lava flowColorado Plateau
原始语种摘要: Abstract(#br)Determining the ages of young volcanic rocks is important for understanding the tectono-magmatic development of geologic terranes. Usually, if rocks are old enough the 40 Ar/ 39 Ar or K–Ar techniques can provide reliable ages. However, when rocks are younger, they often lack enough daughter product to resolve an age. Cosmogenic 3 He methods provide an alternative for determining the eruption age of relatively recent mafic/intermediate lava flows. We sampled morphologically young basaltic andesite flows south of Miller Knoll, near Panguitch Lake on the Markagunt Plateau in southern Utah. We took two samples in close proximity from two different areas on the flows and separated both olivine and pyroxene. The typical protocol is to crush mineral separates on-line to determine an...
全文获取路径: Elsevier  (合作)
影响因子:4.015 (2012)

  • isochron 等时线
  • basaltic 玄武岩的
  • alternative 可选择的
  • overcome 克服
  • exposure 暴露
  • approach