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A separate and secure microscope room is used for the unloading of irradiated samples and radioactive storage.

G., 2017, High-precision Ar and K-Ar Geochronology, in Gilbert, A. (ed.), Encyclopedia of Geoarchaeology: Springer Reference Encyclopedia of Earth Science Series, Springer-Verlag Berlin Heidelberg, p.

M., 2017, Shallow melting of MORB-like mantle under hot continental lithosphere, Central Anatolia: Geochemistry, Geophysics, Geosystems, 18(5), p.

A., 2017, Sediment unmixing using detrital geochronology: Earth and Planetary Science Letters, 477, p.

M., 2016, U-Pb, Re-Os, and Ar/Ar Geochronology of Rare Earth Element (REE)-Rich Breccia Pipes and Associated Host Rocks from the Mesoproterozoic Pea Ridge Fe-REE-Au Deposit, St.

Horton, F., Lee, J., Hacker, B., Bowman-Kamaha'o, M., and Cosca, M., 2015, Himalayan gneiss dome formation in the middle crust and exhumation by normal faulting: New geochronology of Gianbul dome, northwestern India: Geological Society of America Bulletin, 127(1-2), p.

We also have a chemical workspace for heavy liquid separation and Frantz magnetic separation. M., and Johnson, K., 2017, Field evidence for the control of grain size and sediment supply on steady-state bedrock river channel slopes in a tectonically active setting: Earth Surface Processes and Landforms, 42(14), p.

The sample preparation facilities include a series of microscopes to allow the inspection of mineral separates, sample picking, and loading of the irradiation packets.

P., 2016, Geologic map of the Rio Rico and Nogales 7.5' quadrangles, Santa Cruz County, Arizona: U. Geological Survey Scientific Investigations Map 3354, 32 p.

E., 2016, Preservation of ancient impact ages on the R chondrite parent body: Ar age of hornblende-bearing R chondrite LAP 04840: Meteoritics and Planetary Science, 51(9), 1678-1684, doi:10.1111/maps.12692.

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The USGS Ar laboratory currently operates two mass spectrometers, a single collector Mass Analyser Products 215-50 mass spectrometer and a multiple collector Thermo Fisher Scientific ARGUSVI mass spectrometer; a Thermo Scientific HELIX-MC mass spectrometer is scheduled for installation in 2016.

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