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Full-Text Articles in Physical Sciences and Mathematics
The Nature And Origin Of Pebble Dikes And Associated Alteration: Tintic Mining District (Ag-Pb-Zn), Utah, Douglas M. Johnson
The Nature And Origin Of Pebble Dikes And Associated Alteration: Tintic Mining District (Ag-Pb-Zn), Utah, Douglas M. Johnson
Theses and Dissertations
In many ore deposits throughout the world, brecciation often accompanies or occurs in association with mineralization (Sillitoe, 1985). Such is the case in the Tintic Mining District (Ag-Pb-Zn) of north-central Utah, where unique breccia features called pebble dikes occur alongside significant mineralization. Pebble dikes are tabular bodies of breccia, which consist of angular to rounded clasts of quartzite, shale, carbonate, and minor igneous rock cemented in a fine-grained clastic matrix. All clasts now lie above or adjacent to corresponding source rocks. Dikes are thin, typically less than 0.3 m wide to as much as 1 m, and can exceed 100 …
Modern To Late Pleistocene Stable Isotope Climatology Of Alaska, Alison Sloat
Modern To Late Pleistocene Stable Isotope Climatology Of Alaska, Alison Sloat
UNLV Theses, Dissertations, Professional Papers, and Capstones
Understanding modern controls on climate is necessary to interpret past climatic conditions. This project investigated the modern controls on δ18O and δD values in Alaskan surface waters to interpret the controls on Late Pleistocene climate variability. ArcGIS was used to develop an isoscape of modern δ18O and δD values of over 400 surface water samples collected across Alaska and the Yukon. It was found that winter temperature and precipitation have the greatest controls on δ18O and δD values in Alaska, resulting in high δ18O values along the coast of the Gulf of Alaska and low values inland toward Central Alaska. …