Citation

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Gorter, J.D., Korsch, R.J. & Nicoll, R.S., 1996. Thermal history of the Gosses Bluff impact structure, central Australia, from conodont colour-alteration indices: implications for hydrocarbon prospectivity and erosional history. AGSO Journal of Australian Geology and Geophysics  16:4:553-560. Australian Geological Survey Organisation, Canberra.

Abstract

Gosses Bluff is the remnant of a latest Jurassic asteroid or comet impact structure in the Amadeus Basin, central Australia. Conodonts have been successfully extracted from rocks exposed at the central uplift core of the impact structure, as well as from samples in petroleum exploration wells drilled into the structure. Maximum maturation of the source beds in the Early Ordovician Horn Valley Siltstone is reflected by the conodont colour-alteration index (CAl) value of 4 in Gosses Bluff No.2 well. A similar maturation level was attained by late Early Ordovician carbonates of the Stokes Siltstone, both in outcrop and drilled at shallow levels in Gosses Bluff No.1 well. A value of CAl 4 at the present surface indicates that these rocks were uplifted at least 4500m as a result of the impact. Combined with the CAl values from conodonts recovered from petroleum exploration wells to the northeast (Tyler No.1) and southeast (Palm Valley No.1 and West Waterhouse No. 1), the conodont CAl values derived from Gosses Bluff allow the construction of a palaeodepth trend, similar to the CAI-depth trend of the Appalachians and the Kidson Sub-basin of the Canning Basin. This indicates that about 500 m of rock has been eroded from above the Gosses Bluff and Tyler No. 1 well area, and that about 1700- 2800 m has been eroded from the Palm Valley and Waterhouse Range Anticlines. The CAl 4 value for the Horn Valley Siltstone, the primary rich hydrocarbon source rock in the basin, indicates that the organic matter in this formation in the Missionary Plain had reached a level of maturity equivalent to that for production of dry gas before about 140 Ma.
Google map showing geographic bounding box with values North bound -23.15 East bound 134.5 West bound 131.0 South bound -24.7
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Product Type/Sub Type

nonGeographicDataset - GA Publication - Journal

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license
Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

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Date (publication)

1996

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Journal
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-23.15
East bound
134.5
West bound
131.0
South bound
-24.7

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Unknown

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onLine

DISTRIBUTION Format

pdf

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Organisation Name
Geoscience Australia
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Canberra
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ACT
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2601
Country
Australia
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fae9173a-7192-71e4-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

2015-03-23

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

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pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact Geoscience Australia Client Services via:

fax:
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phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).