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The Australo-Antarctic Gulf and the Auversian facies shift

Brian McGowran
The Australo-Antarctic Gulf and the Auversian facies shift (in The late Eocene Earth; hothouse, icehouse, and impacts, Christian Koeberl (editor) and Alessandro Montanari (editor))
Special Paper - Geological Society of America (2009) 452: 215-240

Abstract

Three time lines through the neritic stratigraphic record distributed around the northern margin of the Australo-Antarctic Gulf (AAG) mark three fundamental shifts in global environments collectively comprising the Auversian facies shift. The three lines are: (1) the beginning: the Khirthar transgression and the onset of neritic carbonate accumulation in the Bartonian Age (preceding onset of the Middle Eocene climatic optimum [MECO]); (2) the midlife change (Bartonian-Priabonian transition): the shift from carbonate-rich to carbonate-poor, higher-nutrient environments under estuarine circulation, causing widespread dysaerobia culminating in opaline silicas; and (3) the Eocene-Oligocene = Priabonian-Rupelian boundary and glaciation during oxygen isotope event Oi-1, with return of improved ventilation in neritic environments and resumption of carbonate accumulation. Meanwhile, it was warm and very wet at approximately 60 degrees S. In developing a scenario for the death of the AAG, the birth of the Southern Ocean, and the transition from Paleogene greenhouse Earth to Neogene icehouse Earth, the neritic record of the northern margin is more in accord with the "Dinocyst biogeographic hypothesis" than with the "Tasman gateway hypothesis."


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 452
Title: The Australo-Antarctic Gulf and the Auversian facies shift
Title: The late Eocene Earth; hothouse, icehouse, and impacts
Author(s): McGowran, Brian
Author(s): Koeberl, Christianeditor
Author(s): Montanari, Alessandroeditor
Affiliation: University of Adelaide, School of Earth and Environmental Sciences, Adelaide, South Aust., Australia
Affiliation: University of Vienna, Department of Lithospheric Research, Vienna, Austria
Pages: 215-240
Published: 2009
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-8137-2452-2
Meeting name: Geological Sociaty of America (GSA) Penrose conference
Meeting location: Ancona, ITA, Italy
Meeting date: 20071003Oct. 3-6, 2007
References: 158
Accession Number: 2009-074340
Categories: Stratigraphy
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols.
S48°30'00" - S48°28'60", E149°05'60" - E149°07'00"
S43°58'00" - S43°57'00", E149°55'00" - E149°55'60"
Secondary Affiliation: Osservatorio Geologico di Coldigioco, ITA, Italy
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200940
Program Name: ODPOcean Drilling Program
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