Fumarole gas geochemistry and tree-ring radiocarbon data at Mammoth Mountain, California (1989-2016)

Mammoth Mountain is a dacitic dome complex located on the southwestern rim of Long Valley Caldera, California. Mammoth Mountain has exhibited unrest over the past ~30 years, characterized by seismicity over a broad range of depths, elevated 3He/4He ratios in fumarolic gas and large-scale diffuse CO2 emissions. Monitoring of this unrest has included collection of fumarole gas samples for geochemical analysis and tree cores for radiocarbon analysis of annual growth rings. This report updates the long-term geochemical record at Mammoth Mountain, compiling the chemical and isotopic (d13C-CO2, 3He/4He) compositions of 59 gas samples collected from Mammoth Mountain fumarole from 1998 to 2016. In addition, we report radiocarbon compositions of 1989-2016 and 2013-2016 annual growth rings for the CTWP and HSL-1 lodgepole pines, respectively. The data sets are saved in spreadsheets in the *.csv format. The reader is referred to publications for details on sampling and analytical methods and data interpretations.

Data and Resources

Field Value
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identifier USGS:5c5dcfe9e4b0fe48cb32e618
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modified 20200827
old-spatial -119.05713611111, 37.605797222222, -119.01175833333, 37.649758333333
publisher U.S. Geological Survey
publisher_hierarchy Department of the Interior > U.S. Geological Survey
resource-type Dataset
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theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • ckan
  • fumarole
  • gas-geochemistry
  • geo
  • geoss
  • mammoth-lakes
  • mammoth-mountain
  • mono-county
  • national
  • north-america
  • radiocarbon
  • tree-ring
  • united-states
  • usgs-5c5dcfe9e4b0fe48cb32e618
isopen False
license_id notspecified
license_title License not specified
maintainer Jennifer Lewicki
maintainer_email jlewicki@usgs.gov
metadata_created 2025-11-20T23:12:06.972251
metadata_modified 2025-11-20T23:12:06.972255
notes Mammoth Mountain is a dacitic dome complex located on the southwestern rim of Long Valley Caldera, California. Mammoth Mountain has exhibited unrest over the past ~30 years, characterized by seismicity over a broad range of depths, elevated 3He/4He ratios in fumarolic gas and large-scale diffuse CO2 emissions. Monitoring of this unrest has included collection of fumarole gas samples for geochemical analysis and tree cores for radiocarbon analysis of annual growth rings. This report updates the long-term geochemical record at Mammoth Mountain, compiling the chemical and isotopic (d13C-CO2, 3He/4He) compositions of 59 gas samples collected from Mammoth Mountain fumarole from 1998 to 2016. In addition, we report radiocarbon compositions of 1989-2016 and 2013-2016 annual growth rings for the CTWP and HSL-1 lodgepole pines, respectively. The data sets are saved in spreadsheets in the *.csv format. The reader is referred to publications for details on sampling and analytical methods and data interpretations.
num_resources 2
num_tags 16
title Fumarole gas geochemistry and tree-ring radiocarbon data at Mammoth Mountain, California (1989-2016)