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Arc and mantle detritus in the post-collisional, Lower Silurian Kabadah Formation, Lachlan Orogen, New South Wales


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Barron, LM and Meffre, S and Glen, RA (2007) Arc and mantle detritus in the post-collisional, Lower Silurian Kabadah Formation, Lachlan Orogen, New South Wales. Australian Journal of Earth Sciences, 54 (2 & 3). pp. 353-362. ISSN 0812-0099

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The 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.

Item Type: Article
Keywords: Benambran Orogeny, chromite, Kabadah Formation, Lachlan Orogen, Macquarie Arc, Silurian, supra-subduction zone.
Journal or Publication Title: Australian Journal of Earth Sciences
Page Range: pp. 353-362
ISSN: 0812-0099
Identification Number - DOI: 10.1080/08120090701221698
Additional Information:

The definitive version is available online at

Date Deposited: 12 Jul 2007
Last Modified: 18 Nov 2014 03:19
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