Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/1625
Title: Facies Control on Diagenesis in Frozen Sediments: The Sirius Group, Table Mountain and Mount Feather, Dry Valleys, Antarctica
Contributor(s): Dickinson, W (author); Bleakley, Nerida Lynn (author)
Publication Date: 2005
Handle Link: https://hdl.handle.net/1959.11/1625
Abstract: A petrographic study of the Sirius Group from two locations in the Antarctic Dry Valleys shows distinct differences in both the detrital and diagenetic components of the sediments. The predominantly glaciofluvial depositional environment at Table Mtn. produced a sediment with less matrix and better sorting than did the subglacial depositional environment at Mt. Feather. This set the stage for different diagenetic events to occur because burial histories at both locations are similar. Diagenesis in Sirius Group sediments consists of major modification to primary porosity, dissolution of mostly feldspar framework grains, and precipitation of authigenic chabazite and calcite. Dissolution porosity and authigenic cement dominate at Table Mtn., whereas the development of primary porosity and matrix fabric dominate at Mt. Feather. A working model suggests that at Mt. Feather the pores and matrix fabric developed under wet, periglacial conditions through repeated cycles of freezing and thawing or wetting and drying. This is inferred to have occurred when the diamictite was soft and moist during a period when the climate was warmer than present and when water was more abundant. At Table Mtn. dissolution porosity and precipitation of the authigenic cements, calcite and chabazite, occurred under permanently frozen conditions. This is possible because ionic migration may occur in frozen sediments along interfacial films of brine. These highly saline and alkaline films provide the chemical conditions under which calcite and chabazite can precipitate in dry, subzero conditions.
Publication Type: Journal Article
Source of Publication: Terra Antartica, 12(1), p. 25-34
Publisher: Universita degli Studi di Siena, Museo Nazionale dell'Antartide Felice Ippolito
Place of Publication: Siena, Italy
ISSN: 1122-8628
Field of Research (FOR): 040310 Sedimentology
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Other Links: http://www.mna.it/italiano/Editoria/TAP/TA_abstracts/dickinson12_1.html
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