Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps?
Following the embargo period the above license applies. The 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...
Published in: | Lithos |
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Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier
2016
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Subjects: | |
Online Access: | http://www.sciencedirect.com/science/article/pii/S0024493716000475 http://hdl.handle.net/2381/37819 https://doi.org/10.1016/j.lithos.2016.01.018 |
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ftleicester:oai:lra.le.ac.uk:2381/37819 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
English |
topic |
Science & Technology Physical Sciences Geochemistry & Geophysics Mineralogy Taimyr Siberian Traps Petrogenesis Large igneous province PERMIAN-TRIASSIC BOUNDARY FLOOD-BASALT VOLCANISM TRACE-ELEMENT MANTLE PLUME FRACTIONAL CRYSTALLIZATION AR-40/AR-39 GEOCHRONOLOGY GEOCHEMICAL CONSTRAINTS CRUSTAL CONTRIBUTIONS TECTONIC EVOLUTION |
spellingShingle |
Science & Technology Physical Sciences Geochemistry & Geophysics Mineralogy Taimyr Siberian Traps Petrogenesis Large igneous province PERMIAN-TRIASSIC BOUNDARY FLOOD-BASALT VOLCANISM TRACE-ELEMENT MANTLE PLUME FRACTIONAL CRYSTALLIZATION AR-40/AR-39 GEOCHRONOLOGY GEOCHEMICAL CONSTRAINTS CRUSTAL CONTRIBUTIONS TECTONIC EVOLUTION Reichow, Marc K. Saunders, A. D. Scott, R. A. Millar, I. L. Barfod, D. Pringle, M. S. Rogers, N. W. Hammond, S. Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps? |
topic_facet |
Science & Technology Physical Sciences Geochemistry & Geophysics Mineralogy Taimyr Siberian Traps Petrogenesis Large igneous province PERMIAN-TRIASSIC BOUNDARY FLOOD-BASALT VOLCANISM TRACE-ELEMENT MANTLE PLUME FRACTIONAL CRYSTALLIZATION AR-40/AR-39 GEOCHRONOLOGY GEOCHEMICAL CONSTRAINTS CRUSTAL CONTRIBUTIONS TECTONIC EVOLUTION |
description |
Following the embargo period the above license applies. The 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. Peer-reviewed Post-print |
format |
Article in Journal/Newspaper |
author |
Reichow, Marc K. Saunders, A. D. Scott, R. A. Millar, I. L. Barfod, D. Pringle, M. S. Rogers, N. W. Hammond, S. |
author_facet |
Reichow, Marc K. Saunders, A. D. Scott, R. A. Millar, I. L. Barfod, D. Pringle, M. S. Rogers, N. W. Hammond, S. |
author_sort |
Reichow, Marc K. |
title |
Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps? |
title_short |
Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps? |
title_full |
Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps? |
title_fullStr |
Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps? |
title_full_unstemmed |
Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps? |
title_sort |
petrogenesis and timing of mafic magmatism, south taimyr, arctic siberia: a northerly continuation of the siberian traps? |
publisher |
Elsevier |
publishDate |
2016 |
url |
http://www.sciencedirect.com/science/article/pii/S0024493716000475 http://hdl.handle.net/2381/37819 https://doi.org/10.1016/j.lithos.2016.01.018 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Taimyr Siberia |
genre_facet |
Arctic Taimyr Siberia |
op_relation |
Lithos, 2016, 248-251, pp. 382-401 0024-4937 http://www.sciencedirect.com/science/article/pii/S0024493716000475 http://hdl.handle.net/2381/37819 doi:10.1016/j.lithos.2016.01.018 1872-6143 |
op_rights |
Copyright © 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. |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.lithos.2016.01.018 |
container_title |
Lithos |
container_volume |
248-251 |
container_start_page |
382 |
op_container_end_page |
401 |
_version_ |
1766349697275920384 |
spelling |
ftleicester:oai:lra.le.ac.uk:2381/37819 2023-05-15T15:19:31+02:00 Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps? Reichow, Marc K. Saunders, A. D. Scott, R. A. Millar, I. L. Barfod, D. Pringle, M. S. Rogers, N. W. Hammond, S. 2016-07-07T09:39:33Z http://www.sciencedirect.com/science/article/pii/S0024493716000475 http://hdl.handle.net/2381/37819 https://doi.org/10.1016/j.lithos.2016.01.018 en eng Elsevier Lithos, 2016, 248-251, pp. 382-401 0024-4937 http://www.sciencedirect.com/science/article/pii/S0024493716000475 http://hdl.handle.net/2381/37819 doi:10.1016/j.lithos.2016.01.018 1872-6143 Copyright © 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. CC-BY-NC-ND Science & Technology Physical Sciences Geochemistry & Geophysics Mineralogy Taimyr Siberian Traps Petrogenesis Large igneous province PERMIAN-TRIASSIC BOUNDARY FLOOD-BASALT VOLCANISM TRACE-ELEMENT MANTLE PLUME FRACTIONAL CRYSTALLIZATION AR-40/AR-39 GEOCHRONOLOGY GEOCHEMICAL CONSTRAINTS CRUSTAL CONTRIBUTIONS TECTONIC EVOLUTION Journal Article Article;Journal 2016 ftleicester https://doi.org/10.1016/j.lithos.2016.01.018 2019-03-22T20:21:48Z Following the embargo period the above license applies. The 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. Peer-reviewed Post-print Article in Journal/Newspaper Arctic Taimyr Siberia University of Leicester: Leicester Research Archive (LRA) Arctic Lithos 248-251 382 401 |