(U–Th)/He lab

Lead

 

Campus Golm
Building 27, Room 2.30

Karl-Liebknecht-Str. 24-25
14476 Potsdam-Golm

Extraction line (left), sample chamber and microscope (right)
Photo: Ed Sobel / UP
Extraction line (left), sample chamber and microscope (right)

The (U-Th-Sm)/He lab is equipped with an Alphachron automated system for helium measurement. We routinely measure 2 laser pans of 24 aliquots each in automatic mode in 1 week. We collaborate with PD Dr. Johannes Glodny in section 3.1 at the GFZ-Potsdam; he is responsible for sample dissolution and analysis of U, Th and Sm using ICP-MS. At present, we analyze both apatites and zircons.

Extraction line (left), sample chamber and microscope (right)
Photo: Ed Sobel / UP
Extraction line (left), sample chamber and microscope (right)
Durango_apatite_analyses
Photo: Institute of Geosciences
Results from the Durango age standard

To test the reproducibility of our analyses, we have analyzed numerous aliquots of Durango apatite, which has an age of 31.0 ± 2.0 Ma (mean of 24 (U-Th)/He ages (some without Sm); McDowell et al. 2005) or 31.4 ± 0.2 Ma (40Ar/39Ar; McDowell et al. 2005). From 72 aliquots, we have obtained a mean age of 32.5 ± 2.0 Ma (2σ analytical error). If we discard 6 obvious outliers, we obtain an age of 30.8 ± 1.6 Ma (2σ, N = 66).

Durango_apatite_analyses
Photo: Institute of Geosciences
Results from the Durango age standard
Binocular microscope
Photo: Ed Sobel / UP
Binocular microscope

 

For picking single crystals for analysis, we have a high resolution binocular microscope equipped with a digital camera.

Binocular microscope
Photo: Ed Sobel / UP
Binocular microscope