Multistage evolution of Australian subcontinental mantle: Re-Os isotopic constraints from Victorian mantle xenoliths

Abstract

Research Article| July 01, 1996 Multistage evolution of Australian subcontinental mantle: Re-Os isotopic constraints from Victorian mantle xenoliths Jannene S. McBride; Jannene S. McBride 1Victorian Institute of Earth and Planetary Sciences, Department of Earth Sciences, Monash University, Clayton, Victoria 3168, Australia Search for other works by this author on: GSW Google Scholar David D. Lambert; David D. Lambert 1Victorian Institute of Earth and Planetary Sciences, Department of Earth Sciences, Monash University, Clayton, Victoria 3168, Australia Search for other works by this author on: GSW Google Scholar Alan Greig; Alan Greig 1Victorian Institute of Earth and Planetary Sciences, Department of Earth Sciences, Monash University, Clayton, Victoria 3168, Australia Search for other works by this author on: GSW Google Scholar Ian A. Nicholls Ian A. Nicholls 1Victorian Institute of Earth and Planetary Sciences, Department of Earth Sciences, Monash University, Clayton, Victoria 3168, Australia Search for other works by this author on: GSW Google Scholar Geology (1996) 24 (7): 631–634. https://doi.org/10.1130/0091-7613(1996)024<0631:MEOASM>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Jannene S. McBride, David D. Lambert, Alan Greig, Ian A. Nicholls; Multistage evolution of Australian subcontinental mantle: Re-Os isotopic constraints from Victorian mantle xenoliths. Geology 1996;; 24 (7): 631–634. doi: https://doi.org/10.1130/0091-7613(1996)024<0631:MEOASM>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 Geochemical and Re-Os isotopic data for refractory spinel peridotite xenoliths from the Newer Volcanics Province of western Victoria demonstrate that parts of the subcontinental lithospheric mantle (SCLM) beneath southeastern Australia underwent melt depletion during the Late Proterozoic as well as the early Paleozoic. Late Proterozoic Re-Os model ages (as old as 900 Ma) for refractory harzburgites are significantly older than the exposed Cambrian crust. In addition, our Re-Os melt-depletion mantle model ages (TMA) are consistent with Sm-Nd depleted-mantle model ages (TDM) and older zircon U-Pb ages for I-type granites from southeastern Australia, suggesting that this region is underlain by Proterozoic continental lithosphere. In contrast, a fertile spinel lherzolite xenolith has a radiogenic Os isotopic composition (γOs > +8) consistent with derivation from an "enriched-mantle" volume within the SCLM. Ancient subduction of Re-rich oceanic crust or melt metasomatism of the lithospheric mantle may have generated enriched-mantle volumes similar to those sampled by some ocean-island basalts (OIB) and komatiites. 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.