Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/37819
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dc.contributor.authorReichow, Marc K.-
dc.contributor.authorSaunders, A. D.-
dc.contributor.authorScott, R. A.-
dc.contributor.authorMillar, I. L.-
dc.contributor.authorBarfod, D.-
dc.contributor.authorPringle, M. S.-
dc.contributor.authorRogers, N. W.-
dc.contributor.authorHammond, S.-
dc.date.accessioned2016-07-07T09:39:33Z-
dc.date.available2017-02-08T02:45:06Z-
dc.date.issued2016-02-08-
dc.identifier.citationLithos, 2016, 248-251, pp. 382-401en
dc.identifier.issn0024-4937-
dc.identifier.urihttp://www.sciencedirect.com/science/article/pii/S0024493716000475en
dc.identifier.urihttp://hdl.handle.net/2381/37819-
dc.descriptionFollowing the embargo period the above license applies.en
dc.description.abstractThe Siberian large igneous province (LIP) forms the world's most extensive continental exposure of basalt and has several sub-provinces surrounding it, which may be genetically related. The Taimyr peninsula of north Siberia is one of these sub-provinces and is frequently assumed to be the northerly continuation of the basalts exposed at Noril'sk, the best-studied area of the Siberian LIP. However, the correlation is uncertain. We present new major and trace element data from 35 samples of extrusive and intrusive rocks from Taimyr, with Sr and Nd isotope data from a subset of ten. The Taimyr rocks fall into two groups with low (~ 7 wt.%) and elevated (~ 9 wt.%) MgO concentrations. The high-MgO rocks display a restricted range of initial 87Sr/86Sr (0.705 to 0.706) and 143Nd/144Nd (0.5122 to 0.5124) ratios, and share bulk silicate earth normalised rare earth element patterns strikingly similar to data observed in the ore-related Noril'sk intrusions. The remaining low-MgO group samples have a broader range with higher Sr and lower Nd isotope values and higher incompatible trace element ratios (e.g., Th/Ta > 5.3 and La/Smn > 1.7) similar to the crustally-contaminated Nadezhdinsky and Morongovsky suite basalts of the Noril'sk region. The major and trace element data for both groups are consistent with a process of fractional crystallisation coupled with small degrees of assimilation of incompatible-element-enriched lower crust involving different contaminants. Trace element model calculations indicate a process of magma formation at large degrees of partial melting and at pressures of less than 3 GPa, probably within the garnet–spinel transition zone or the spinel stability field of the asthenospheric mantle. We obtained an argon plateau age of ~ 252 (252.7 ± 1.5) Ma and a ~ 239 Ma total fusion age from a Taimyr lava and intrusive sample, respectively, confirming that volcanism is only partly contemporaneous with the activity of the Siberian LIP. Although this is in agreement with previous interpretations, we argue that the age difference between both events is only ~ 13 Ma and probably less (~ 5 Ma) although further investigation of the relationship is required. Our data allow correlation with distinct Noril'sk members and most importantly to the ore-bearing (Ni–Cu) intrusions implying that whole rock chemistry could have value as a prospecting tool in Taimyr.en
dc.language.isoenen
dc.publisherElsevieren
dc.rightsCopyright © Elsevier, 2016. This article is distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/ ), which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.en
dc.subjectScience & Technologyen
dc.subjectPhysical Sciencesen
dc.subjectGeochemistry & Geophysicsen
dc.subjectMineralogyen
dc.subjectTaimyren
dc.subjectSiberian Trapsen
dc.subjectPetrogenesisen
dc.subjectLarge igneous provinceen
dc.subjectPERMIAN-TRIASSIC BOUNDARYen
dc.subjectFLOOD-BASALT VOLCANISMen
dc.subjectLARGE IGNEOUS PROVINCEen
dc.subjectTRACE-ELEMENTen
dc.subjectMANTLE PLUMEen
dc.subjectFRACTIONAL CRYSTALLIZATIONen
dc.subjectAR-40/AR-39 GEOCHRONOLOGYen
dc.subjectGEOCHEMICAL CONSTRAINTSen
dc.subjectCRUSTAL CONTRIBUTIONSen
dc.subjectTECTONIC EVOLUTIONen
dc.titlePetrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps?en
dc.typeJournal Articleen
dc.identifier.doi10.1016/j.lithos.2016.01.018-
dc.identifier.eissn1872-6143-
dc.description.statusPeer-revieweden
dc.description.versionPost-printen
dc.type.subtypeArticle;Journal-
pubs.organisational-group/Organisationen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERINGen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Geologyen
dc.dateaccepted2016-01-24-
Appears in Collections:Published Articles, Dept. of Geology

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