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Research Article| November 01, 2007 New insights into the genesis of Indian kimberlites from the Dharwar Craton via in situ Sr isotope analysis of groundmass perovskite Chad Paton; Chad Paton 1University of Melbourne, School of Earth Sciences, McCoy Building, University of Melbourne, Parkville, Victoria 3010, Australia Search for other works by this author on: GSW Google Scholar Janet M. Hergt; Janet M. Hergt 1University of Melbourne, School of Earth Sciences, McCoy Building, University of Melbourne, Parkville, Victoria 3010, Australia Search for other works by this author on: GSW Google Scholar David Phillips; David Phillips 1University of Melbourne, School of Earth Sciences, McCoy Building, University of Melbourne, Parkville, Victoria 3010, Australia Search for other works by this author on: GSW Google Scholar Jon D. Woodhead; Jon D. Woodhead 1University of Melbourne, School of Earth Sciences, McCoy Building, University of Melbourne, Parkville, Victoria 3010, Australia Search for other works by this author on: GSW Google Scholar Simon R. Shee Simon R. Shee 2Shee & Associates Pty Limited, 74 Liston Street, Glen Iris, Victoria 3146, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Chad Paton 1University of Melbourne, School of Earth Sciences, McCoy Building, University of Melbourne, Parkville, Victoria 3010, Australia Janet M. Hergt 1University of Melbourne, School of Earth Sciences, McCoy Building, University of Melbourne, Parkville, Victoria 3010, Australia David Phillips 1University of Melbourne, School of Earth Sciences, McCoy Building, University of Melbourne, Parkville, Victoria 3010, Australia Jon D. Woodhead 1University of Melbourne, School of Earth Sciences, McCoy Building, University of Melbourne, Parkville, Victoria 3010, Australia Simon R. Shee 2Shee & Associates Pty Limited, 74 Liston Street, Glen Iris, Victoria 3146, Australia Publisher: Geological Society of America Received: 30 Apr 2007 Revision Received: 06 Jul 2007 Accepted: 10 Jul 2007 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 The Geological Society of America, Inc. Geology (2007) 35 (11): 1011–1014. https://doi.org/10.1130/G24040A.1 Article history Received: 30 Apr 2007 Revision Received: 06 Jul 2007 Accepted: 10 Jul 2007 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Chad Paton, Janet M. Hergt, David Phillips, Jon D. Woodhead, Simon R. Shee; New insights into the genesis of Indian kimberlites from the Dharwar Craton via in situ Sr isotope analysis of groundmass perovskite. Geology 2007;; 35 (11): 1011–1014. doi: https://doi.org/10.1130/G24040A.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 In situ Sr isotopic analyses of kimberlitic perovskite are more representative of primary magmatic compositions than conventional bulk-rock analyses of the same samples, because the latter are variably compromised by contamination and alteration processes. Bulk-rock Sr isotopic data obtained for 18 intrusions from the adjacent Narayanpet and Wajrakarur kimberlite fields of the Dharwar Craton, India, exhibit a high degree of scatter (∼0.701–0.709) and have indistinguishable initial isotope ratios. In contrast, laser ablation perovskite results display strikingly uniform and distinct initial 87Sr/86Sr compositions for each field of 0.70312–0.70333 and 0.70234–0.70251, respectively. The increased resolution provided by these new data permits the evaluation of key aspects of kimberlite genesis. It is argued that lithospheric and crustal contamination had a negligible impact on the perovskite Sr isotope compositions, and that these values are representative of the primary melt component in each field. The results cast doubt on models of kimberlite formation that invoke either the small degree melting of metasomatized subcontinental lithospheric mantle, or derivation from unusually enriched asthenospheric mantle. The data are more compatible with a source region for the Dharwar kimberlites that was similar to a common mantle component such as prevalent mantle (PREMA) or focal zone (FOZO). You do not have access to this content, please speak to your institutional administrator if you feel you should have access.