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| Central Queensland basalt province | |
|---|---|
| Name | Central Queensland basalt province |
| Type | volcanic province |
| Location | Central Queensland, Australia |
| Geology | flood basalt, basaltic lava, pyroclastics |
| Period | Cenozoic |
Central Queensland basalt province is a Cenozoic volcanic province in central-eastern Australia characterized by widespread basaltic lava fields, volcanic cones, and associated pyroclastic deposits. The province is a component of the Australian continent's intraplate volcanism and is spatially associated with major river catchments and agricultural regions in Queensland. It has been the subject of petrological, geochronological, and geochemical study by Australian research institutions and international collaborators.
The province comprises tholeiitic to alkali basaltic rocks, including olivine basalt, hawaiite, and basanite, with variable phenocryst assemblages such as olivine, clinopyroxene, and plagioclase. Key mineralogical features have been documented by researchers at the Geological Survey of Queensland, the University of Queensland, and the Australian National University. Geochemical classifications use trace-element ratios and rare-earth-element patterns to distinguish mantle source characteristics and degrees of partial melting, drawing comparison with other intraplate provinces like the Eifel volcanic fields, the Kaapvaal Craton intraplate suites, and the Columbia River Basalt Group. Isotopic studies commonly reference Sr isotope, Nd isotope, and Pb isotope systems to evaluate lithospheric versus asthenospheric contributions.
Formation models invoke mantle upwelling, lithospheric thinning, and small-scale convection beneath the eastern Australian plate during the Neogene and Quaternary. Interpretations reference tectonic events such as the northward migration of the Australian Plate relative to the Pacific Plate and extensional episodes linked to the opening of the Coral Sea. Explanatory frameworks draw on analogues including hotspot-related volcanism like the Hawaii hotspot and edge-driven convection mechanisms proposed for regions like the Great Basin. Stratigraphic relationships with underlying Paleozoic basement units and Mesozoic sedimentary basins are documented in regional mapping by the Bureau of Mineral Resources and state geological surveys.
Basalt outcrops and volcanic centers are distributed across inland and coastal parts of central Queensland, with concentrations near river systems and elevated tablelands. Notable volcanic centers and fields within the province include individual volcanic cones, scoria rings, and shield-like edifices mapped by the Queensland Department of Natural Resources and Mines and academic teams from the James Cook University. Field mapping and remote sensing used by the Geoscience Australia database delineate lava flow extents and vent alignments, often correlating with lineaments recognized on satellite imagery and aeromagnetic surveys.
The landscape comprises pahoehoe and aa lava flow morphologies, cinder cones, maar structures, lava tubes, and scoria deposits. Many cones exhibit classic strombolian eruption products and well-preserved flow lobes, comparable in form to features observed on the Auckland volcanic field and the Hawaiian Islands. Volcanic soils derived from basalt contribute to local topography and have been mapped in regional land-use studies by the Queensland Department of Agriculture and Fisheries and the CSIRO.
Radiometric dating—principally 40Ar/39Ar and K–Ar methods—places major eruptive phases in the late Neogene to Quaternary, with individual ages refined through paleomagnetic correlation and stratigraphic superposition. Laboratories at the Australian National University, the University of Melbourne, and international facilities have contributed age determinations that constrain eruptive episodes and recurrence intervals. Age models are integrated with luminescence dating of interbedded sediments and tephrochronology applied across river terraces and archaeological contexts in the region.
Basalt-derived regolith supports productive agricultural soils, viticulture, and horticulture in parts of central Queensland, influencing land-use practices documented by the Queensland Department of State Development and the Australian Bureau of Agricultural and Resource Economics. Construction materials, crushed rock aggregate, and local quarrying of basaltic units provide resources catalogued by the Geological Survey of Queensland. Environmental considerations include groundwater flow in fractured basalts, biodiversity on volcanic substrates studied by the Queensland Herbarium, and hazard assessment relevant to populated areas and infrastructure under the remit of the Queensland Reconstruction Authority.
Ongoing research involves geochemical fingerprinting, geochronology, and geophysical imaging using seismic, gravity, and magnetotelluric techniques by teams at the Commonwealth Scientific and Industrial Research Organisation and Australian universities. Monitoring for volcanic hazards is coordinated with national agencies such as the Geoscience Australia volcanic hazards program and state emergency services, incorporating satellite remote sensing from platforms like Landsat and Sentinel-2 for thermal anomaly detection and landform change. International collaborations compare the province with intraplate volcanic provinces worldwide, including studies involving the Smithsonian Institution and continental volcanic research networks.
Category:Volcanism of Australia Category:Geology of Queensland