This page uses JavaScript to progressively load the article content as a user scrolls.
Screen reader users, click the load entire article button to bypass dynamically loaded article content.
&RIS&(for EndNote, Reference Manager, ProCite)
&RefWorks Direct Export
& Citation Only
& Citation and Abstract
JavaScript is disabled on your browser.
Please enable JavaScript to use all the features on this page.
JavaScript is disabled on your browser.
Please enable JavaScript to use all the features on this page. This page uses JavaScript to progressively load the article content as a user scrolls. Click the View full text link to bypass dynamically loaded article content.
Available online 7 September 2017 —
Trace elements in olivine of ultramafic lamprophyres controlled by phlogopite-rich mineral assemblages in the mantle source, , , , , , , a Department of Earth and Planetary Sciences, Macquarie University, North Ryde, NSW 2109, Australiab Institute for Geosciences, Johannes Gutenberg University of Mainz, 55099 Mainz, Germany&Aillikitic olivines divided into three groups of core compositions&Main phenocryst population gives insight into source composition&Trace elements show no indication for recycled oceanic or continental crust&Trace elements in olivines support phlogopite + carbonate-bearing veins in source&Experimental melting of peridotite in presence of H2O and CO2 yields similar composition as in UML&Multi-stage igneous activityCarbonate-rich ultramafic lamprophyres (aillikites) and associated rocks characteristically occur during the early stages of thinning and rifting of cratonic mantle lithosphere, prior to the eruption of melilitites, nephelinites and alkali basalts. It is accepted that they require volatile-rich melting conditions, and the presence of phlogopite and carbonate in the source, but the exact source rock assemblages are debated. Melts similar to carbonate-rich ultramafic lamprophyres (aillikites) have been produced by melting of peridotites in the presence of CO2 and H2O, whereas isotopes and trace elements appear to favour distinct phlogopite-bearing rocks.Olivine macrocrysts in aillikites are usually rounded and abraded, so that it is debated whether they are phenocrysts or mantle xenocrysts. We have analysed minor and trace element composition in olivines from the type aillikites from Aillik Bay in Labrador, Canada. We characterize five groups of olivines: [1] mantle xenocrysts, [2] the main phenocryst population, and [3] reversely zoned crystals interpreted as phenocrysts from earlier, more fractionated, magma batches, [4] rims on the phenocrysts, which delineate aillikite melt fractionation trends, and [5] rims around the reversely zoned olivines. The main phenocryst population is characterized by mantle-like Ni (averaging 3400 μg&g& 1) and Ni/Mg at Mg# of 88&90, overlapping with phenocrysts in ocean island basalts and Mediterranean lamproites. However, they also have low 100Mn/Fe of 0.9&1.3 and no correlation between Ni and other trace elements (Sc, Co, Li) that would indicate recycled oceanic or continental crust in their sources. The low Mn/Fe without high Ni/Mg, and the high V/Sc (2&5) are inherited from phlogopite in the source that originated by solidification of lamproitic melts at the base of the cratonic lithosphere in a previous stage of igneous activity. The olivine phenocryst compositions are interpreted to result from phlogopite and not high modal pyroxene in the source. The presence of kimberlites and ultramafic lamprophyres of Mesozoic age in Greenland indicates the persistence of a steep edge to the cratonic lithosphere at a time when this had been removed from the western flank in Labrador.KeywordsOlivine; trace element; carbonate-rich ultramafic lamprophyre; phlogopite-rich source; cratonic lithosphere
No articles found.
This article has not been cited.
No articles found.PRIMUS: Galaxy Clustering as a Function of Luminosity and Color at 0.2 & z & 1 [eScholarship]News & Features About Open Access Site-wide Policies Publish/DepositGet Started Now Manage Your Publications Browse ContentBrowse by HelpGet help with Resources for Publication Policies New eScholarship site coming soon: open code, public API— | eScholarship requires Javascript to be enabled in your
browser.of 20Address: Multiple emails? Use
commas.WARNING: eScholarship requires
Javascript to be enabled in your browser.20 Peer ReviewedTitle:PRIMUS: Galaxy Clustering as a Function of Luminosity and Color at 0.2 & z & 1Journal Issue:The Astrophysical Journal, 784(2)Author:; ; ; ; ; ; Publication Date:April 1, 2014Series:Permalink:DOI:Totals TotalMonthly AverageHits81.00Downloads10.12By MonthMonthHitsDownloads2017-08102016-08102016-02102016-01212015-07102015-04102015-03102014-1000
Powered by the Items in eScholarship are protected by copyright, with all rights reserved, unless otherwise indicated.