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.
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Acknowledgments
We wish to thank the elders of the Bunaba people, and in particular, Joe Ross, Selena Middleton and June Oscar for their support, advice and hospitality during our field work. We also thank O. Lehnert, C. Kerans, and R. Hocking for their comments on previous versions of the manuscript. This project was carried out under sponsorship of the National Geographic Society (grant #8683-09 to ME Johnson) and the Sperry Fund of Williams College (in support of undergraduate fieldwork in geology).
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Johnson, M.E., Webb, G.E., Baarli, B.G. et al. Upper Devonian shoal-water delta integrated with cyclic back-reef facies off the Mowanbini Archipelago (Canning Basin), Western Australia. Facies 59, 991–1009 (2013). https://doi.org/10.1007/s10347-012-0348-7
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DOI: https://doi.org/10.1007/s10347-012-0348-7