Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps?
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 north...
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ftleicesterunfig:oai:figshare.com:article/10132811 2023-05-15T15:19:14+02:00 Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps? Marc K. Reichow A. D. Saunders R. A. Scott I. L. Millar D. Barfod M. S. Pringle N. W. Rogers S. Hammond 2016-02-08T00:00:00Z https://figshare.com/articles/journal_contribution/Petrogenesis_and_timing_of_mafic_magmatism_South_Taimyr_Arctic_Siberia_A_northerly_continuation_of_the_Siberian_Traps_/10132811 unknown 2381/37819 https://figshare.com/articles/journal_contribution/Petrogenesis_and_timing_of_mafic_magmatism_South_Taimyr_Arctic_Siberia_A_northerly_continuation_of_the_Siberian_Traps_/10132811 CC BY-NC-ND 4.0 CC-BY-NC-ND Uncategorized 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 Text Journal contribution 2016 ftleicesterunfig 2021-11-11T19:40:11Z 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 ... Other Non-Article Part of Journal/Newspaper Arctic Taimyr Siberia University of Leicester: Figshare Arctic |
institution |
Open Polar |
collection |
University of Leicester: Figshare |
op_collection_id |
ftleicesterunfig |
language |
unknown |
topic |
Uncategorized 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 |
Uncategorized 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 Marc K. Reichow A. D. Saunders R. A. Scott I. L. Millar D. Barfod M. S. Pringle N. W. Rogers S. Hammond Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps? |
topic_facet |
Uncategorized 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 |
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 ... |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Marc K. Reichow A. D. Saunders R. A. Scott I. L. Millar D. Barfod M. S. Pringle N. W. Rogers S. Hammond |
author_facet |
Marc K. Reichow A. D. Saunders R. A. Scott I. L. Millar D. Barfod M. S. Pringle N. W. Rogers S. Hammond |
author_sort |
Marc K. Reichow |
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? |
publishDate |
2016 |
url |
https://figshare.com/articles/journal_contribution/Petrogenesis_and_timing_of_mafic_magmatism_South_Taimyr_Arctic_Siberia_A_northerly_continuation_of_the_Siberian_Traps_/10132811 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Taimyr Siberia |
genre_facet |
Arctic Taimyr Siberia |
op_relation |
2381/37819 https://figshare.com/articles/journal_contribution/Petrogenesis_and_timing_of_mafic_magmatism_South_Taimyr_Arctic_Siberia_A_northerly_continuation_of_the_Siberian_Traps_/10132811 |
op_rights |
CC BY-NC-ND 4.0 |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766349416057274368 |