Sample Name: MHS1
IGSN: IEAM20003
Laboratory: Arizona Radiogenic Helium Dating Laboratory
Analyst: Amy Moser, Alexis Ault, Uttam Chowdury, Pete Reiners
Instrumental Method - He: diode laser, quadrupole mass spectrometer
Instrumental Method Reference - He: Fish Canyon Tuff zircon
Instrumental Method - U-Th-Sm: isotope dilution ICP-MS
Instrumental Method Reference - U-Th-Sm: Fish Canyon Tuff zircon
Alpha Ejection Correction Method: Hourigan et al. (2005)
Alpha Ejection Correction Method Reference:
Mineral: zircon
Comment:
238U Decay Constant: 1.55125E-10
238U Decay Constant Error:
235U Decay Constant: 9.84850E-10
235U Decay Constant Error:
232Th Decay Constant : 4.94750E-11
232Th Decay Constant Error:
230Th Decay Constant:
230Th Decay Constant Error:
238U/235U: 137.88
Decay Constant Reference: Steiger, R.H. and Jager, E., 1977, Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology. Earth and Planetary Science Letters, v. 36, no. 3, p. 359-362.
147Sm Decay Constant: 6.54E-12
147Sm Decay Constant Error:
147Sm Decay Constant Reference: Lugmair, G.W., and Marti, K., 1978, Lunar initial 143Nd/144Nd: differential evolution of the lunar crust and mantle: Earth and Planetary Science Letter, v. 39, p. 349-357.
Decay Constant Comment:

Sample ID: MHS1
Sample Description:
GeoObject Type: Individual Sample
Geoobject Classification: Gneiss
Collection Method:
Material: Rock
Latitude: 33.62415
Longitude: -115.994708
Sample Comment:
Collector: Amy Moser
Material Classification: Gneiss
Primary Location Name: Mecca Hills
Primary Location Type: Canyon
Location Description:
Locality: Mecca Hills Wilderness
Locality Description:
Country: United States
Provice: California
County: Riverside
City Or Township: Mecca
Platform:
Platform ID:
Original Archival Institution: Utah State University
Original Archival Contact: amoser1@fandm.edu
Most Recent Archival Institution: Utah State University
Most Recent Archival Contact: alexis.ault@usu.edu

Spike Type U-Th-Sm: 233U-229Th-147Nd-90Zr
Spike Type He: 3He
Standard Mineral: zircon
Standard Mineral Reference: Fish Canyon Tuff
Standard True Age: 28.3
Standard True Age Error: 0.8
Standard Measured Age:
Standard Measured Age Error:
Data Reduction Comment: mass calculated from [Zr] and stoichiometry (Guenthner et al., 2016)