Upper Devonian shoal-water delta integrated with cyclic back-reef facies off the Mowanbini Archipelago (Canning Basin), Western Australia

Johnson, Markes E., Webb, Gregory E., Baarli, B. Gudveig and Walsh, Daniel R. (2013) Upper Devonian shoal-water delta integrated with cyclic back-reef facies off the Mowanbini Archipelago (Canning Basin), Western Australia. Facies, 59 4: 991-1009. doi:10.1007/s10347-012-0348-7


Author Johnson, Markes E.
Webb, Gregory E.
Baarli, B. Gudveig
Walsh, Daniel R.
Title Upper Devonian shoal-water delta integrated with cyclic back-reef facies off the Mowanbini Archipelago (Canning Basin), Western Australia
Journal name Facies   Check publisher's open access policy
ISSN 0172-9179
1612-4820
Publication date 2013-10
Year available 2013
Sub-type Article (original research)
DOI 10.1007/s10347-012-0348-7
Volume 59
Issue 4
Start page 991
End page 1009
Total pages 19
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2014
Language eng
Formatted abstract
The Oscar Range in Western Australia’s Canning Basin exhibits folded Proterozoic, quartzite, quartzite conglomerate, phyllite, and metavolcanic rocks that survive with positive relief. Facies of the Pillara Limestone were deposited around this relief during Late Devonian (Frasnian) time. A segment of the Great Devonian Barrier Reef with a linear reef margin strikes parallel to the outer paleoislands in the Mowanbini Archipelago. A more sheltered strait separates inner islands from the cratonic Devonian mainland on the Kimberley Block. Large fan-deltas emanated from the craton, but locally small shoal-water deltas prograded from a drainage basin on one of the larger paleoislands in the Oscar Range. That island is expressed today by local topography exhumed from beneath a cover of former Devonian, Carboniferous, and Permian strata. The Devonian shoal-water delta rests unconformably on tilted Proterozoic phyllite and incorporates abundant phyllitic debris accumulated under fluvial to shoreface conditions. Some quartzite pebbles and hydrothermal quartz were derived from a source more than a kilometer away. Rare gastropods and stromatoporoid fragments in the deltaic sediments were abraded from the adjacent reef margin. The clast-supported conglomerate in the exposed shoal-water delta is mapped over a distance of 130 m to within 15 m of the inner reef margin, exposed nearby on steeply dipping phyllite. A cyclic succession of mixed clastic and carbonate parasequences, 31.5 m in thickness, follows above a disconformity surface on the delta-top facies. The overall succession represents a minor fall in relative sea level associated with erosion of delta facies and a major transgression characterized by a retrograde parasequence stacking pattern. The succession shifts through siliciclastic-rich shoreface to intertidal distal back-reef facies, ending with a subtidal, siliciclastic-poor proximal back-reef facies. The study demonstrates how variability in sedimentary cycles is influenced by local paleogeographic constraints in an island system dominated by quartzite highlands and phyllite lowlands
Keyword Canning Basin
Coastal dynamics
Mixed clastics and carbonates
Oscar Range
Paleo drainage basins
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2014 Collection
 
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