Comings and goings of the end-Cryogenian ice sheet: A stratigraphic study of the pre-, syn-, and post-glacial deposits, South Australia.
- Resource Type
- Theses
- Authors
- Rose, Catherine V.
- Source
- Dissertation Abstracts International; Dissertation Abstract International; 74-01B.
- Subject
- Geology
Geomorphology
Paleoclimate Science
- Language
- English
Summary: Sedimentologically and geochemically distinctive carbonate sequences consistently drape the glacial deposits associated with the Marinoan ice age record the deglaciation. An isochronous model proposes that cap dolostones were deposited synchronously as a blanket around the world regardless of water depth, whilst a diachronous model proposes that deposition tracked glacioeustatic flooding during deglaciation. I present a comprehensive carbon isotope dataset that supports neither a uniquely isochronous or diachronous model, and given the high frequency spatial variability of delta13C values, temperature cannot be the dominant control on the isotopic variability of the cap dolostone. This work provides the first test of the cap dolostone models using sedimentological and delta13C data taken from across a basin in different water depths.