Famennian mud-mounds in the proximal fore-reef slope, Canning Basin, Western Australia

Webb, Gregory E. (2001) Famennian mud-mounds in the proximal fore-reef slope, Canning Basin, Western Australia. Sedimentary Geology, 145 3-4: 295-315. doi:10.1016/S0037-0738(01)00153-1

Author Webb, Gregory E.
Title Famennian mud-mounds in the proximal fore-reef slope, Canning Basin, Western Australia
Journal name Sedimentary Geology   Check publisher's open access policy
ISSN 0037-0738
Publication date 2001-12-15
Sub-type Article (original research)
DOI 10.1016/S0037-0738(01)00153-1
Open Access Status Not Open Access
Volume 145
Issue 3-4
Start page 295
End page 315
Total pages 21
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
Famennian (Late Devonian) carbonate buildups and, in particular, mud-mounds, are poorly known, in general, and few have been documented in detail. Relatively small Famennian mud-mounds occur in proximal fore-reef slope settings in the Canning Basin, Western Australia. The Famennian platform margin facies passes from typical shoaling carbonate facies in the back reef, through massive, calcimicrobial, cement-rich reef-margin facies, to relatively steeply dipping (20–30°), well-bedded fore-reef slope facies containing shelf-derived, winnowed grainy sediments and extremely coarse reef-block debris. Isolated or coalescing mounds occur in the proximal slope, immediately adjacent to and, in some cases, possibly grading into the margin facies. Mounds are elongate perpendicular to the margin and some had synoptic relief greater than 2 m. Mounds are lithologically variable and consist of varying proportions of micrite, multiple generations of marine cement, abundant Rothpletzella, Renalcis, poorly preserved sparry microbial crusts and sporadically distributed laminar stromatoporoids. Surrounding grainy slope facies abut and slope off of mound flanks. Mound facies are very similar to nearby reef-margin facies, with the exceptions that stromatoporoids have not been observed in margin facies and solenoporoid algae, which occur in the margin, have not been observed in the mounds. Stromatolites are conspicuously absent from both facies. Mound facies appear to be more closely related to Frasnian and Famennian calcimicrobe cement-dominated reef-margin facies than to Famennian deep-water stromatolite–sponge-mound facies, such as those that occur elsewhere in the Canning Basin. The observed Canning Famennian reef and mound frameworks were constructed by communities that appear to be very similar to earlier Frasnian communities, despite the Frasnian–Famennian extinction event, and provide good examples of microbial reef framework construction in a high energy setting.
Keyword Devonian
Canning Basin
Northwestern Australia
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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