Late Archean and Early Proterozoic crustal evolution of the Mount Isa block, northwest Queensland, Australia

Research Article| December 01, 1997 Late Archean and Early Proterozoic crustal evolution of the Mount Isa block, northwest Queensland, Australia Graeme D. McDonald; Graeme D. McDonald 1Department of Earth Sciences, University of Queensland, St. Lucia, Queensland, 4072, Australia Search for other works by this author on: GSW Google Scholar Kenneth D. Collerson; Kenneth D. Collerson 1Department of Earth Sciences, University of Queensland, St. Lucia, Queensland, 4072, Australia Search for other works by this author on: GSW Google Scholar Peter D. Kinny Peter D. Kinny 2Department of Applied Physics, Curtin University of Technology, GPO Box U1987, Perth, Western Australia, 6001, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Graeme D. McDonald 1Department of Earth Sciences, University of Queensland, St. Lucia, Queensland, 4072, Australia Kenneth D. Collerson 1Department of Earth Sciences, University of Queensland, St. Lucia, Queensland, 4072, Australia Peter D. Kinny 2Department of Applied Physics, Curtin University of Technology, GPO Box U1987, Perth, Western Australia, 6001, Australia Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1997) 25 (12): 1095–1098. https://doi.org/10.1130/0091-7613(1997)025<1095:LAAEPC>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation Graeme D. McDonald, Kenneth D. Collerson, Peter D. Kinny; Late Archean and Early Proterozoic crustal evolution of the Mount Isa block, northwest Queensland, Australia. Geology 1997;; 25 (12): 1095–1098. doi: https://doi.org/10.1130/0091-7613(1997)025<1095:LAAEPC>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Recognition of Late Archean and Early Proterozoic tonalite-trondhjemite-granodiorite crust in the Mount Isa block, northwest Queensland, Australia, has important implications for Proterozoic crustal evolutionary models in the North Australian craton. Protoliths of the Black Angel Gneiss Complex formed 2.42–2.50 Ga (Black Angel Gneisses) and 1.97–2.00 Ga (Pothole Creek Gneisses). Both groups have Nd model ages of 2.42 to 2.58 Ga. Supracrustal components within the gneiss complex have Nd model ages of 2.75 to 2.83 Ga. These data, and inherited components in zircons, indicate the presence of even older Archean crust. Crystallization of 1.84–1.87 Ga rims record a thermal event during a subsequent period of granitic (Kalkadoon-Leichhardt) magmatism. Both the Black Angel Gneiss Complex and Kalkadoon-Leichhardt magmatic suite have strong arc geochemical signatures and have components that are compositionally similar to Archean tonalite-trondhjemite-granodiorite lithologies. A seismically defined, crustal-scale, west-dipping feature in the Mount Isa block may be a Proterozoic cryptic suture. Subduction-zone magmatism may be related to this feature. Late Archean and Early Proterozoic crust formation in this segment of the North Australian craton was subduction driven, involving assembly of microcontinental terranes similar to other Early Proterozoic belts. This observation is significant, because paleomagnetic data indicate that the North Australian craton and Laurentia were juxtaposed during Early to Middle Proterozoic time. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.