Retention of isotopic memory in garnets partially broken down during an overprinting granulite-facies metamorphism: Implications for the Sm-Nd closure temperature

Abstract

Research Article| March 01, 1995 Retention of isotopic memory in garnets partially broken down during an overprinting granulite-facies metamorphism: Implications for the Sm-Nd closure temperature Bas J. Hensen; Bas J. Hensen 1Department of Applied Geology, University of New South Wales, Sydney, New South Wales 2052, Australia Search for other works by this author on: GSW Google Scholar Bo Zhou Bo Zhou 1Department of Applied Geology, University of New South Wales, Sydney, New South Wales 2052, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Bas J. Hensen 1Department of Applied Geology, University of New South Wales, Sydney, New South Wales 2052, Australia Bo Zhou 1Department of Applied Geology, University of New South Wales, Sydney, New South Wales 2052, Australia Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1995) 23 (3): 225–228. https://doi.org/10.1130/0091-7613(1995)023<0225:ROIMIG>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 MailTo Tools Icon Tools Get Permissions Search Site Citation Bas J. Hensen, Bo Zhou; Retention of isotopic memory in garnets partially broken down during an overprinting granulite-facies metamorphism: Implications for the Sm-Nd closure temperature. Geology 1995;; 23 (3): 225–228. doi: https://doi.org/10.1130/0091-7613(1995)023<0225:ROIMIG>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 Garnets from an early granulite event that have partially broken down to orthopyroxene-bearing assemblages during a second regional granulite-facies metamorphism were used to test the closure temperature of the Sm-Nd system in garnet. The garnets from Søstrene Island, Prydz Bay, Antarctica, retain a memory of both the physical conditions of their formation and their Sm-Nd age, notwithstanding an effective diameter for diffusion of only 1 mm. Because only minor isotopic resetting of these garnets has taken place during the overprinting granulite event, the closure temperature for the Sm-Nd system in garnet in the present case must be >700–750 ° C. The results show that chronological constraints are essential for the unambiguous interpretation of reaction textures in terms of thermotectonic evolution. The garnet Sm-Nd dating method is particularly well suited for this purpose. 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.