This sample belongs to: Amy Moser
Sample Name: TC-19
IGSN: IEAM20004
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: TC-19
Sample Description:
GeoObject Type: Individual Sample
Geoobject Classification: Schist
Collection Method:
Material: Rock
Latitude: 33.666214
Longitude: -115.899553
Sample Comment:
Collector: Amy Moser
Material Classification: Schist
Primary Location Name: Mecca Hills
Primary Location Type: Canyon
Location Description: Mecca Hills Wilderness
Locality:
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
| Analysis Purpose |
Value |
Error |
Age Type |
MSWD |
Age Error Systematic |
Included Analyses |
Comment |
| cooling |
22.5 |
2.8 |
average age with standard error |
|
|
z1, z2, z3, z4, z5 |
|
Data Reduction Parameters
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)
| Fraction Name |
Mineral |
Age, Ma |
err., Ma |
U (ppm) |
Th (ppm) |
147Sm (ppm) |
Th/U |
He (nmol/g) |
Mass (ug) |
Ft |
| TC-19/IEAM20004-z1 |
zircon |
21.589792917117 |
0.33679812211609 |
584.10 |
64.31 |
N/A |
0.11 |
49.41 |
2.22 |
0.71 |
| TC-19/IEAM20004-z2 |
zircon |
23.676436347394 |
0.3474604965247 |
562.71 |
235.05 |
N/A |
0.42 |
58.89 |
3.22 |
0.75 |
| TC-19/IEAM20004-z3 |
zircon |
23.546808011987 |
0.34595295015714 |
969.99 |
440.68 |
N/A |
0.45 |
101.48 |
3.11 |
0.75 |
| TC-19/IEAM20004-z4 |
zircon |
20.548542255755 |
0.32467898740303 |
355.41 |
76.90 |
N/A |
0.22 |
28.97 |
1.32 |
0.70 |
| TC-19/IEAM20004-z5 |
zircon |
23.201017674183 |
0.35221753188716 |
2824.20 |
516.75 |
N/A |
0.18 |
264.04 |
2.00 |
0.72 |
filename:22837.xml
