ORCID Profile
0000-0002-2361-6014
Current Organisation
Queen's University
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Publisher: Oxford University Press (OUP)
Date: 07-2016
Publisher: Springer Science and Business Media LLC
Date: 16-04-2013
DOI: 10.1038/NCOMMS2702
Abstract: Subduction of intraplate seamounts beneath a geochemically depleted mantle wedge provides a seldom opportunity to trace element recycling and mantle flow in subduction zones. Here we present trace element and Sr, Nd and Pb isotopic compositions of lavas from the central Tonga-Kermadec arc, west of the contemporary Louisville-Tonga trench intersection, to provide new insights into the effects of Louisville seamount subduction. Elevated (206)Pb/(204)Pb, (208)Pb/(204)Pb, (86)Sr/(87)Sr in lavas from the central Tonga-Kermadec arc front are consistent with localized input of subducted alkaline Louisville material (lavas and volcaniclastics) into sub-arc partial melts. Furthermore, absolute Pacific Plate motion models indicate an anticlockwise rotation in the subducted Louisville seamount chain that, combined with estimates of the timing of fluid release from the subducting slab, suggests primarily trench-normal mantle flow beneath the central Tonga-Kermadec arc system.
Publisher: Elsevier BV
Date: 09-2012
Publisher: Elsevier BV
Date: 2012
Publisher: Wiley
Date: 20-07-2021
Publisher: Elsevier BV
Date: 08-2023
Publisher: American Geophysical Union (AGU)
Date: 15-04-2011
DOI: 10.1029/2011JB008323
Publisher: American Geophysical Union (AGU)
Date: 05-02-2011
DOI: 10.1029/2010JB007738
Publisher: Springer Science and Business Media LLC
Date: 08-01-2014
DOI: 10.1038/NCOMMS4060
Publisher: American Geophysical Union (AGU)
Date: 09-2011
DOI: 10.1029/2011GC003683
Publisher: American Geophysical Union (AGU)
Date: 08-2011
DOI: 10.1029/2011GC003654
Publisher: Canadian Science Publishing
Date: 11-2001
DOI: 10.1139/E01-041
Abstract: The volcanic and sedimentary rocks of the Passamaquoddy Bay (PB) area of southeastern New Brunswick are part of the SilurianDevonian Coastal Volcanic Belt (CVB), an extensive belt of bimodal volcanic rocks. The PB sequence is 4 km thick, has four cycles of mafic and felsic volcanism, and is intruded by mafic dykes at all levels. There are two ages of dykes, those related to the Late Silurian PB volcanism (PB dykes) and Mesozoic dykes (the Minister Island Dyke) related to the opening of the North Atlantic. The PB mafic dykes are subalkalic basalt to basaltic andesite, within-plate tholeiites. The dykes are moderately to highly evolved (Mg# = 66.6 to 26.6), with trends of major and trace elements typical of the fractionation of olivine, pyroxene, plagioclase, and ilmenite. The PB mafic dyke swarm comprises over 155 dykes which represent a greater range of compositions than the associated flows, suggesting that they give a more complete representation of the Late Silurian PB mafic magmas. They exhibit incompatible element characteristics best accounted for by crustal contamination. The dykes plot on a linear array away from mantle mixing lines between depleted and enriched mantle sources and toward the composition of the PB felsic units, suggesting that these felsic units are representative of partial melts and fractionates of the source contaminate. The variable TiO 2 contents (1.24.3 wt.%) and incompatible element ratio trends plotted against a fractionation index suggest that mantle metasomatism, either fluid or melt derived, may also have influenced the mantle source of the dykes. The dykes dip steeply and have a relatively consistent strike to the north. Most dykes range in thickness from 0.5 to 2 m, but range up to 9 m. The single orientation of the dykes, along with their chemical characteristics and volume, and association with a bimodal intraplate volcanic sequence, are consistent with an extensional tectonic setting. Constraints of the regional geology suggest that this extension was associated with convergence, perhaps in a back-arc setting.
Publisher: Society of Economic Geologists
Date: 23-11-2012
Publisher: Society of Economic Geologists
Date: 23-11-2012
Publisher: Springer Science and Business Media LLC
Date: 27-06-2006
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 02-2010
Publisher: Geological Society of America
Date: 04-2002
No related grants have been discovered for Matthew Leybourne.