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Late diagenetic history of the Ninmaroo Formation (Cambro-Ordovician), Georgina Basin, Queensland and Northern Territory

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Created 20/01/2025

Updated 20/01/2025

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The Cambro-Ordovician Ninmaroo Formation is an extensive, predominantly carbonate unit in the southeastern Georgina Basin of Queensland and the Northern Territory. Following deposition and syndepositional diagenesis (eogenesis), which included hypersaline and moderate evaporitic overprints, the formation was further over-printed during three additional diagenetic stages: early telogenesis (near surface), mesogenesis (burial), and late telogenesis (uplift and erosion). An inventory of diagenetic products is presented. Extensive dolomitisation , unquantified hydrocarbon migration, and sulphide mineralisation during mesogenetic and mixed mesogenetic-late telogenetic stages were structurally controlled. During late mesogene-sis, intercrystalline porosity developed with pervasive dolomitisation, while other types of porosity in limestones were occluded by calcite cement or hydrocarbons. Development of moldic , collapse-breccia and cavern porosity, karstification, and dedolomitisation developed in both stages of telogenesis , but were better developed in the later, prolonged stage. The duration of each stage varied locally with the burial and tectonic history. Consequently, both time and spatial variations of diagenetic paragenesis exist. Regions of differing history are the Toko Syncline , Smoky Anticline and western platform , and the Burke River Structural Belt.

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Title Late diagenetic history of the Ninmaroo Formation (Cambro-Ordovician), Georgina Basin, Queensland and Northern Territory
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/d4352f08-3b5e-464e-8951-9d7afee0b612
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[137.0, -24.0], [141.0, -24.0], [141.0, -21.0], [137.0, -21.0], [137.0, -24.0]]]}
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