Barron_et_al._pp._353-362.pdf (789.67 kB)
Download fileArc and mantle detritus in the post-collisional, Lower Silurian Kabadah Formation, Lachlan Orogen, New South Wales
journal contribution
posted on 2023-05-25, 23:02 authored by Barron, LM, Meffre, S, Glen, RAThe Kabadah Formation outcrops in central New South Wales as a thrust package 66 km long, interleaved with Lower Silurian Canowindra Volcanics and situated between the Junee-Narromine and Molong Volcanic Belts of the Ordovician Macquarie Arc. The Kabadah Formation contains Early Silurian corals and Llandovery graptolites. Its provenance is complex, with detrital fragments of mafic- intermediate volcanic rocks, free crystals of pyroxene, chromite and ultramafic clasts, detrital volcanic quartz, garnet, and clasts of welded S-type rhyolitic volcanic rocks; and rare clasts from uplifted foldbelt rocks (granite and metamorphosed and deformed sediments). The variety of these clasts suggests that the Kabadah Formation records the Benambran collision of the Macquarie Arc with Ordovician quartz-rich sedimentary rocks, with detritus also derived from coeval Early Silurian mafic and felsic magmatism. The major source of detritus was from the short-lived emergent Fifield arc that formed from the subduction of an older backarc basin. The Kabadah Formation accumulated in an upwardshallowing Early Silurian marine basin between phases of the Benambran Orogeny.
History
Publication title
Australian Journal of Earth SciencesVolume
54Article number
2 & 3Number
2 & 3Pagination
353-362ISSN
0812-0099Publication status
- Published
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