Sedimentology of the Cambrian, Upper Kanmantoo Group, southern Fleurieu Peninsula, South Australia
Date
1985
Authors
Boord, R. A.
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Abstract
The Balquhidder Formation, Petrel Cove Formation and Middleton Sandstone are the youngest exposed metasediments of the Kanmantoo Group, a 9km thick succession occurring in the Adelaide Hills and on Kangaroo Island. The Petrel Cove Formation conformably overlies the Balquhidder Formation. However, the contact between the Petrel Cove Formation and overlying Middleton Sandstone is not exposed in the type area and its geological nature is speculative. These three formations comprise 4km in their type areas of Southern Fleurieu Peninsula where this study was made.
The Balquhidder and Petrel Cove Formations consist of seven facies: (1) parallel laminated mudstone to siltstone; (2) cross laminated siltstone to fine sandstone; (3) parallel laminated fine to medium sandstone; (4) massive fine to medium sandstone; (5) cross 1aminated medium to coarse sandstone; (6) massive coarse to gravelly sandstone; and (7) disorganized clast supported gravelly sandstone. These facies can be grouped into two facies associations suggesting deposition in a submarine fan environment. Association A: lower middle fan/outer fan channel fill and interchannel deposits: and association B: outer fan/basin plain plain lobe, lobe fringe, fan fringe and basin plain deposits.
The Middleton Sandstone consists of five facies: (1) parallel laminated mudstone to siltstone; (2) cross laminated siltstone to fine sandstone; (3) parallel laminated fine sandstone; (4) massive fine sandstone; and (5) cross bedded fine sandstone suggesting deposition in an intertidal/subtidal environment.
The sandstones comprising the three formations are dominantly quartzo-feldspathic suggesting derivation from older Precambrian crystalline basement. Palaeocurrent data suggests that the source area for the sediments of the Balquhidder and Petrel Cove Formations was to the north-west and for the Middleton Sandstone to the west.
The succession probably accumulated on a passive but rapidly subsiding continental margin.
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School of Physical Sciences
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Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, YEAR
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