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Full-Text Articles in Physical Sciences and Mathematics
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. …
Structural And Geochronologic History Of Southern Alaskan Blueschists, Erik M. Day
Structural And Geochronologic History Of Southern Alaskan Blueschists, Erik M. Day
Open Access Theses & Dissertations
Detrital zircon data are presented from the Liberty Creek blueschist in the central Chugach Mountains which indicate two distinct periods of the preservation of blueschist facies metamorphism along the southern Alaskan margin. A maximum depositional age of ~136 Ma demonstrates that the Liberty Creek schist was deposited long after the Jurassic cooling ages (196-185 Ma; Lopez-Carmona et al., 2011) recorded in western Alaskan blueschist bodies, revealing two blueschist preservation events. This Early Cretaceous depositional age also indicates that there have been major reorganizations within this subduction complex because the Potter Creek assemblage, directly south of the Liberty Creek schist, is …