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| Tabberabberan Orogeny | |
|---|---|
| Name | Tabberabberan Orogeny |
| Period | Early Carboniferous–Late Carboniferous |
| Time start | ~325 Ma |
| Time end | ~310 Ma |
| Region | Eastern Australia, New Zealand, Antarctica (Gondwana margin) |
| Type | Orogenic event |
Tabberabberan Orogeny The Tabberabberan Orogeny is a late Paleozoic mountain-building episode that affected parts of eastern Gondwana during the Carboniferous, producing fold belts, thrust systems, and magmatic suites across what are now eastern Australia, New Zealand, and portions of Antarctica. It linked convergent-plate interactions involving former terranes and continental blocks and generated mineralization that later attracted exploration by mining companies and geological surveys. Research on the event has involved collaborations among national institutions and international researchers using field mapping, geochronology, and geophysical techniques.
The Tabberabberan interval is recognized in regional correlation frameworks developed by institutions such as the Geological Survey of New South Wales, Geological Survey of Victoria, and the Australian National University. Stratigraphic absorbance and tectonostratigraphic interpretations reference major formations recognized near the Great Dividing Range, Hunter Region, and the Darling Basin; equivalent or related deformation phases are cited in studies of the South Island (New Zealand) and the Transantarctic Mountains. Debates about its delimitation involve workers from the British Geological Survey, United States Geological Survey, and university groups at University of Sydney and Victoria University of Wellington.
The orogenic belts formed along the paleo-Pacific margin of Gondwana adjacent to microcontinents and accreted terranes such as the New England Orogen, Throssell Range, and fragments correlated with the Western Province (New Zealand). The tectonic mosaic included interactions with the Lachlan Fold Belt, Delamerian Orogeny relics, and the Ross orogen-affected crust of Antarctica. Key basins and structural provinces involved include the Lachlan Orogen, Gondwanide Orogen, and the Cape Fold Belt analogs, and their spatial relationships are discussed in syntheses from the Geological Society of Australia and the American Geophysical Union.
Geochronological constraints derive from U–Pb zircon ages obtained at laboratories linked to CSIRO, Geoscience Australia, Monash University, and the University of Otago; these place main deformation and plutonism in the Carboniferous interval (~Tournaisian–Serpukhovian to Bashkirian–Moscovian). Tectonic models invoke oceanic subduction beneath continental or arc terranes, accretion of island arcs comparable to the New England Orogen arc terranes, and strike-slip partitioning along structures analogous to the Alpine Fault and former plate boundaries recognized in reconstructions by researchers at the Australian Academy of Science and the International Union of Geological Sciences. Paleomagnetic and plate-reconstruction work from groups linked to the Scripps Institution of Oceanography and the Lamont–Doherty Earth Observatory informs relative motions of Gondwanan blocks during the orogeny.
Exposed lithologies include deformed sedimentary sequences (sandstones, siltstones, turbidites) correlated to units like the Narrabeen Group and marine successions similar to the Maitland Group, interleaved with volcaniclastic andesites and rhyolites comparable to suites reported in the Whangarei District. Major structural architecture comprises fold-thrust belts, imbricate thrusts, regional cleavage development, and large-scale nappes analogous to features in the Variscan Belt and interpreted in maps by the New Zealand Geological Survey. Geological mapping by provincial surveys and university field teams documents pervasive F2–F3 folding, reverse faulting, and belt-parallel shear zones that record progressive shortening and crustal thickening.
Metamorphic grades range from low-greenschist to amphibolite facies in high-strain zones; mineral assemblages record prograde metamorphism with index minerals such as chlorite, biotite, garnet, and staurolite, paralleled in metamorphic terranes studied at University of Tasmania and University of Canterbury. Syn- to post-tectonic magmatism produced granitoid bodies dated by SHRIMP and LA-ICP-MS techniques in laboratories at Australian National University and Otago University, showing affinities to subduction-related calc-alkaline suites similar to magmatism in the Batholith of Patagonia and arcs elsewhere. Metamorphic P–T–t paths reconstructed by researchers affiliated with the European Geosciences Union indicate crustal thickening followed by thermal relaxation and exhumation.
The orogeny localized mineral systems including base-metal skarns, Volcanogenic Massive Sulfide (VMS) analogs, and orogenic gold systems explored by firms registered with the Australian Securities Exchange and surveyed by entities such as Geoscience Australia and the Ministry of Business, Innovation and Employment (New Zealand). Notable commodity targets include copper–gold porphyry-like systems, lead–zinc deposits, and orogenic gold occurrences comparable to deposits in the Lihir Gold Mine region in tectonic setting, and exploration technologies applied by companies like BHP and Rio Tinto have targeted these provinces. Regional mineral resource assessments by the World Bank-linked projects and national geological agencies integrate data from drilling, geochemistry, and aeromagnetic surveys.
Early recognition of the Tabberabberan deformation was advanced by regional geologists working with the Commonwealth Scientific and Industrial Research Organisation and state geological surveys during mid-20th-century mapping campaigns; subsequent refinement involved contributions from academic geologists at University of Melbourne, University of New England (Australia), and international collaborators at the Smithsonian Institution. Modern investigations combine structural geology, sedimentology, detrital zircon provenance studies, and isotope geochemistry using facilities at the Australian Synchrotron, ANU Geochronology Centre, and international labs at ETH Zurich and the University of Cambridge. Geophysical imaging using seismic reflection, gravity, and magnetotelluric methods conducted by industry and research consortia including Geoscience Australia continues to refine models of crustal architecture and resource potential.
Category:Orogenies Category:Paleozoic orogenies Category:Geology of Australia