Citation

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Elphinstone, R., 1989. Sedimentology and Facies Distribution within the Horn Valley Siltstone, Amadeus Basin : A Reconnaissance Study. Record  1989/002. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

Exposure of the Horn Valley Siltstone is usually poor, but well preserved material can be obtained from some of the fully cored wells intersecting this interval throughout the Amadeus Basin. In this study, the following cored holes were used: Henbury #4, Henbury #6, Mt Liebig #2, Tempe Vale#1 and Tent Hill #1. I have subdivided the formation into ten informal members, HV1(lowermost) to HV10, which reflect vertical lithofacies variations in a shallow marine shelf environment. These members have been defined primarily from sedimentological and palaeontological information such as the presence or absence of body fossils, mode of preservation, species associations within groups of fossils, presence or absence of bioturbating organisms (trace fossils), lithology and bedding types. It can be inferred that the amount and composition of organic matter preserved in the sediment was determined largely by the concentration of oxygen in the bottom water and the extent to which the sediment was disrupted by burrowing organisms because burrowing and scavenging activities of benthic organisms are controlled by the concentration of oxygen in the bottom water. Organic geochemical data fromTempe Vale #1 and Tent Hill #1 were used to confirm these facies variations. The transition between HV6 and HV7, which can be recognised easily by the sudden change in shale to carbonate ratio, has been found to coincide with the presence of high organic rich sediments, with recorded TOC values of up to 6.30%.
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Date (publication)

1989

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geology
palaeontology
Earth Sciences

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1996-10-30

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