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This data release includes 40Ar/39Ar data from the U.S. Geological Survey for samples from Old Mine Park Area, Trumbull, Connecticut. Mineral samples were collected by Robert Wintsch and Harold Moritz. Potassium-bearing mineral grains were separated from the bulk sample and analyzed by argon geochronology at the U.S. Geological Survey Bascom ARgon Dating (BARD) Laboratory in Reston, Virginia. The data provide age constraints on units in the relevant geologic mapping area.
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The refractory nature of zircon to temperature and pressure allows even a single zircon grain to preserve a rich history of magmatic, metamorphic, and hydrothermal processes. Isotopic dating of micro-domains exposed in cross-sections of zircon grains allows us to interrogate this history. Unfortunately, our ability to select the zircon grains in a heavy mineral concentrate that records the most geochronologic information is limited by our inability to predict internal zonation from observations of whole zircon grains. Here we document the use of a petrographic microscope to observe and image the photoluminescence (PL) response of whole zircon grains excited under ultraviolet (UV) light, and the utility of this PL...
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This dataset comprises photomicrographs from drill core and outcrop samples from the Ironwood Iron-Formation.
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These data comprise chemical analyses in weight percent of oxides, as well as chlorine and fluorine, conducted using a JEOL JXA-8900 electron microprobe analyzer (EPMA) on amphiboles, pyroxenes, and carbonates in the Ironwood Iron-Formation.
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This dataset comprises various energy-dispersive spectroscopy (EDS) analyses from drill core and outcrop samples in the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin, USA.
This dataset accompanies planned publication 'Unmixing multiple metamorphic muscovite age populations with powder X-ray diffraction and 40Ar/39Ar analysis'. The 40Ar/39Ar and electron microprobe data are from samples adjacent to a lower greenschist facies shear zone in western New Hampshire. The geochronology coupled with the electron microprobe data provide a petrochronologic framework for the rocks studied in the manuscript. Sample collection was supervised by Ryan McAleer, Gregory Walsh, and Peter Valley of the USGS.
    map background search result map search result map Photomicrographs from the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin, USA Electron microprobe analyses of amphibole, pyroxene, and carbonate minerals from the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin, USA Scanning electron microscope (SEM) images from the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin, USA Energy-dispersive X-ray spectroscopy (EDS) analyses from the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin, USA Photoluminescence Imaging of Whole Zircon Grains on a Petrographic Microscope—An Underused Aide for Geochronologic Studies Electron microprobe and 40Ar/39Ar isotopic data from west-central New Hampshire 40Ar/39Ar data from the Old Mine Park area, Trumbull, Connecticut 40Ar/39Ar data from the Old Mine Park area, Trumbull, Connecticut Electron microprobe and 40Ar/39Ar isotopic data from west-central New Hampshire Photomicrographs from the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin, USA Electron microprobe analyses of amphibole, pyroxene, and carbonate minerals from the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin, USA Scanning electron microscope (SEM) images from the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin, USA Energy-dispersive X-ray spectroscopy (EDS) analyses from the Ironwood Iron-Formation, Gogebic Iron Range, Wisconsin, USA Photoluminescence Imaging of Whole Zircon Grains on a Petrographic Microscope—An Underused Aide for Geochronologic Studies