NMGRL Site Map

• Homepage
• Introduction

• Overview
  • Isotopes of Potassium and Argon
  • Radioactive decay of parent isotope
• The K/Ar Dating Technique
  • General Assumptions for the K/Ar technique
  • K/Ar age determination
  • Problems and limitations of the K/Ar technique
• The 40Ar/39Ar Dating Technique
  • Principles of the 40Ar/39Ar method
  • Irradiation/Production of 39Ar
  • 40Ar/39Ar age determination
  • Issues with the 40Ar/39Ar technique

• Current Projects
  • Metamorphism in the Sangre de Cristo
    Mtns, New Mexico
  • Geology of the Solton Sary mesothermal gold district, Kyrgyzstan
  • Geochronology of the Ocate volcanic field,
    New Mexico
  • Excess Argon in quartz and sanidine from Vallez
    caldera, New Mexico
  • The Great Unconformity in the southwest US
  • Crustal exhumation of the Rocky Mountains
  • Grand Canyon Supergroup Geochronology
  • Excess Argon in volcanic biotites
  • Geochronology of the Ferrar Igneous Province,
    Antarctica
  • Thermochronology of Upper Granite Gorge,
    Grand Canyon
  • Cratonization and the Trans Hudson Origin, Canada
  • Stratigraphy of the Cape Roberts Drill Core, Antarctica
    
• Past Projects
  • Geochronology of the Taos Volcanic Field,
    New Mexico
    
  • Dating of Quartz Fluid Inclusions, Capitan,
    New Mexico
  • Paleotopography of the Raton-Clayton volcanic field,
    New Mexico
  • Geochronology of Mt. Berlin, Antarctica
  • Geochronology of Mt. Erebus, Antarctica
  • Geochronology of The Pleiades volcanic field,
    Anarctica
  • Geochronology of Yucca Mtn, Nevada
  • Stratigraphy of englacial tephra, Antarctica

• NMGRL Publications
• Argon community publications

• William C. McIntosh
• Matthew T. Heizler
• Lisa Peters
• Richard P. Esser

• Vladimir Ispolatov
• Erwin Melis
• Chris Harpel
• Stacey Perilli
• Jeff Winick
• Brian Olmsted
• Scott Lynch

Hardware

• Extraction System
  • Furnace
    • Schematic
    • Data
  • CO2 Laser
    • Schematic
    • Data
    • Photo Gallery
    • Video clip
  • UV Laser
    • Schematic
    • Data
    • Photo Gallery
    • Video Clip
  • Mechanical Crusher
    • Schematic
    • Data
    • Photo Gallery
• Mass Spectrometer
  • schematic/specifications

Software

• Mass Spec

Data

• Age Spectra
  • Explanation
  • Groundmass
  • Biotite
  • Hornblende
  • Anorthoclase
  • K-Feldspar
  • Alunite/Jarosite
• Isochron
  • Explanation
  • Atmospheric intercept
  • Excess Argon (>295.5)
  • Recoil? (<295.5)
  • Argon Loss
• Ideogram
  • Explanation
  • Sanidine
  • Sanidine + plagioclase
  • Sanidine + xenocrysts
  • Biotite
• Data Tables
  • Explanation (step-heated)
  • Explanation (fusion)

Samples

• Submittal
• available for 40Ar/39Ar dating
• preparation/separation

Reports

• On-line 40Ar/39Ar reports

Links

• Other argon geochronology laboratories
• useful geochronology links

Site Map

Contact Info