Sedimentary facies of a glacially influenced continental succession in the Pennsylvanian Jericho Formation, Galilee Basin, Australia

Jones, Andrew T. and Fielding, Chrostopher R. (2008) Sedimentary facies of a glacially influenced continental succession in the Pennsylvanian Jericho Formation, Galilee Basin, Australia. Sedimentology, 55 3: 531-556. doi:10.1111/j.1365-3091.2007.00911.x


Author Jones, Andrew T.
Fielding, Chrostopher R.
Title Sedimentary facies of a glacially influenced continental succession in the Pennsylvanian Jericho Formation, Galilee Basin, Australia
Journal name Sedimentology   Check publisher's open access policy
ISSN 0037-0746
Publication date 2008-06
Sub-type Article (original research)
DOI 10.1111/j.1365-3091.2007.00911.x
Open Access Status Not Open Access
Volume 55
Issue 3
Start page 531
End page 556
Total pages 26
Place of publication United Kingdom
Publisher Wiley-Blackwell Publishing
Language eng
Formatted abstract
Recent work on the Late Palaeozoic Ice Age in eastern Australia has shown the Joe Joe Group in the eastern Galilee Basin, Queensland, to be of critical importance as it is one of few records of Pennsylvanian glacial activity outside South America. This paper presents detailed sedimentological data, from which the Late Palaeozoic environment of the region is reconstructed and which, consequently, allows for robust comment on the broader Gondwanan glaciation. The Jericho Formation, in the lower Joe Joe Group, was deposited in an active extensional basin in lacustrine to fluvial environments, during the mid-Namurian to early Stephanian. The region experienced a cool climate during this time, and polythermal mountain or valley-type glaciers periodically advanced into the area from highlands to the north-east. The Jericho Formation preserves a suite of proglacial to terminal glacial facies that is characterized by massive and stratified diamictites deposited from debris flows, massive and horizontally laminated conglomerates and sandstones deposited from hyperconcentrated density flows, laminated siltstones with outsized clasts and interlaminated siltstone/ conglomerate deposited through ice-rafting into lakes, and sedimentary dykes and breccias deposited through overpressurization of groundwater beneath permafrost. Non-glacial facies are dominated by fluvial sandstones and lacustrine/overbank siltstones. The glacigenic rocks of the Jericho Formation are confined to discrete packages, recording three separate glacial advances during the latest Namurian to late Westphalian. This arrangement is consistent with the temporal distribution of glacigenic rocks from around the remainder of Australia and Gondwana, which supports the theory that glacial deposits occurred in discrete intervals. The Joe Joe Group is a key succession in the world in this context as, at this time, eastern Australia provides the only unequivocal evidence of a Namurian/Westphalian glaciation outside South America. The continuous record of sedimentation through the Pennsylvanian and Early Permian is indicative of significant warming between glacial intervals, which is difficult to reconcile with the development of long-lived, cold-based ice sheets across the supercontinent.
Keyword Australia
Late paleozoic glaciation
Glaciation
Queensland
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth Sciences Publications
 
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Created: Thu, 03 Sep 2009, 10:03:34 EST by Mr Andrew Martlew on behalf of School of Earth Sciences