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The Geochronology Repository is an active collection of radiometric ages generated by the Montana Bureau of Mines and Geology (MBMG). The geochronology data are organized in a public facing database with attributes describing field location, geologic context, geochronology method, and laboratory of analysis. Hand samples, thin sections, heavy mineral separates, and grain mounts of processed samples are stored in the MBMG Geologic Materials Repository. The collection is available to the public.
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Apatite (Ca5(PO4)3(Cl/F/OH)) and rutile (TiO2) samples were collected by the U.S. Geological Survey (USGS) from the iron oxide-apatite-rare earth element (IOA-REE) and iron oxide-copper-gold (IOCG) deposits hosted by the Mesoproterozoic, St. Francois Mountains terrane, southeast Missouri. Samples were prepared and analyzed for direct age dating on a laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS) system at the USGS in Denver, Colorado from May 2016 to June 2019.
The Geologic Materials Repository is an active collection of research specimens gathered by the Montana Bureau of Mines and Geology (MBMG). Curated specimens include hand samples, thin sections, powder residues, or heavy mineral separates. The geologic materials are organized in containers and stored on shelves in a designated building located on the Montana Technological University campus. MBMG maintains a public facing database of the collection’s inventory that includes attributes describing the field location, geologic context, materials curated, storage information, and record of analytical work. The collection is available to the public.


    map background search result map search result map In situ U-Pb dating of apatite and rutile from St. Francois Mountains IOA and IOCG deposits, southeast Missouri In situ U-Pb dating of apatite and rutile from St. Francois Mountains IOA and IOCG deposits, southeast Missouri