Title: Hf isotopes of MARID (mica-amphibole-rutile-ilmenite-diopside) rutile trace metasomatic processes in the lithospheric mantle
Abstract: Research Article| January 01, 2005 Hf isotopes of MARID (mica-amphibole-rutile-ilmenite-diopside) rutile trace metasomatic processes in the lithospheric mantle Mathieu Choukroun; Mathieu Choukroun 1Magistère des Sciences de la Terre, École Normale Supérieure, 24, rue Lhomond, 75005 Paris, France, and National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC), Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia Search for other works by this author on: GSW Google Scholar Suzanne Y. O'Reilly; Suzanne Y. O'Reilly 2GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia Search for other works by this author on: GSW Google Scholar William L. Griffin; William L. Griffin 3GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia, and Commonwealth Scientific and Industrial Research Organisation (CSIRO) Exploration and Mining, North Ryde, NSW 2113, Australia Search for other works by this author on: GSW Google Scholar Norman J. Pearson; Norman J. Pearson 4GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia Search for other works by this author on: GSW Google Scholar J. Barry Dawson J. Barry Dawson 5School of Geosciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK Search for other works by this author on: GSW Google Scholar Geology (2005) 33 (1): 45–48. https://doi.org/10.1130/G21084.1 Article history received: 12 Aug 2004 rev-recd: 20 Sep 2004 accepted: 22 Sep 2004 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Mathieu Choukroun, Suzanne Y. O'Reilly, William L. Griffin, Norman J. Pearson, J. Barry Dawson; Hf isotopes of MARID (mica-amphibole-rutile-ilmenite-diopside) rutile trace metasomatic processes in the lithospheric mantle. Geology 2005;; 33 (1): 45–48. doi: https://doi.org/10.1130/G21084.1 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 The Hf isotope composition of rutile in mica-amphibole-rutile-ilmenite-diopside (MARID) xenoliths from the Kimberley area of South Africa has been analyzed in situ by laser ablation microprobe–multicollector–inductively coupled plasma mass spectrometry to investigate metasomatic processes in the lithospheric mantle. The 176Hf/177Hf ratio shows a wide range, from 0.2811 to 0.2858 (εHf = −55 to +110); much of this range is found within single samples and even within single grains. We suggest that the MARID rutiles initially resulted from the interaction of an asthenospheric melt with ancient depleted harzburgitic mantle with low 176Hf/177Hf ratios (<0.2812) and Lu/Hf ratios of ∼0.04, that dominated their Hf budget. The MARID rocks were later metasomatized by a fluid and/or melt that had caused the breakdown of eclogitic or lherzolitic garnet with Lu/Hf ratios of ∼0.6, providing a source of highly radiogenic Hf. The low 176Hf/177Hf ratios preserved in some MARID rutiles show that the Nd-Hf isotope systematics of kimberlites and lamproites can be explained by mixing between an asthenospheric melt and the ancient subcontinental lithospheric mantle. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 2005
Publication Date: 2005-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 67
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