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Deltaic Sedimentation In Eastern Atchafalaya Bay, Louisiana., Ivor Llewellyn Van Heerden
Deltaic Sedimentation In Eastern Atchafalaya Bay, Louisiana., Ivor Llewellyn Van Heerden
LSU Historical Dissertations and Theses
A new Mississippi delta--now in the subaerial growth phase--is building in Atchafalaya Bay, south-central Louisiana, as the result of a natural upstream di-version. Early studies of this event documented gross accretion in Atchafalaya Bay. The present study focuses on subaerial delta lobe responses, stratigraphic development, and sedimentation processes that are incorporated into a model for delta growth. A sedimentological research program undertaken in the eastern half of the Atchafalaya delta has shown that two distinct stages of subaerial delta response are recognizable. The first (younger) re-sponse consists of channel extension, bifurcation, and development of sinuous overbank channels. A latter, more …
Petrology And Geochemistry Of The Silver Plume-Age Plutons Of The Southern And Central Wet Mountains, Colorado., Russell Berryman Bender Jr
Petrology And Geochemistry Of The Silver Plume-Age Plutons Of The Southern And Central Wet Mountains, Colorado., Russell Berryman Bender Jr
LSU Historical Dissertations and Theses
The 1.43 billion-year-old Silver Plume-age intrusive complex of the central and southern Wet Mountains, Colorado, is subdivided into six units. In inferred order of intrusion, these include: the San Isabel batholith, the granite of Cliff Creek, the granite of Williams Creek, the granite of Bear Creek, the Wixson Divide pluton, and the granite of the Mount Tyndall quadrangle. All rocks are metaluminus to mildly peraluminus, calc-alkaline, and modally range from melanocratic biotite-hornblende-rich granite to leucocratic alaskite. The biotite-rich granites are non-eutectic and crystallized at a temperature of 710(DEGREES)C to 850(DEGREES)C. The leucocratic granites are eutectic and crystallized between 650(DEGREES)C and …