Petrogenetic constraints for the genesis of Archaean sanukitoid suites: geochemistry and isotopic evidence from Karelia, Baltic Shield
New Sm–Nd isotope data are presented for late Archaean sanukitoid suites of the Karelian granite-greenstone terrane of the Baltic Shield. Within the terrane, there are regional variations in the Nd isotope compositions of the sanukitoids. Sanukitoids in the youngest Central Karelian domain have Nd i...
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ftunivkingston:oai:eprints.kingston.ac.uk:236 2023-05-15T17:01:30+02:00 Petrogenetic constraints for the genesis of Archaean sanukitoid suites: geochemistry and isotopic evidence from Karelia, Baltic Shield Kovalenko, A. Clemens, J.D. Savatenkov, V. 2005-01 https://eprints.kingston.ac.uk/id/eprint/236/ https://doi.org/10.1016/j.lithos.2004.05.006 unknown Kovalenko, A., Clemens, J.D. and Savatenkov, V. (2005) Petrogenetic constraints for the genesis of Archaean sanukitoid suites: geochemistry and isotopic evidence from Karelia, Baltic Shield. Lithos, 79(1-2), pp. 147-160. ISSN (print) 0024-4937 Earth systems and environmental sciences Archaean Baltic shield Sanukitoid Sm–Nd Rb–Sr Article PeerReviewed 2005 ftunivkingston https://doi.org/10.1016/j.lithos.2004.05.006 2022-02-22T09:01:00Z New Sm–Nd isotope data are presented for late Archaean sanukitoid suites of the Karelian granite-greenstone terrane of the Baltic Shield. Within the terrane, there are regional variations in the Nd isotope compositions of the sanukitoids. Sanukitoids in the youngest Central Karelian domain have Nd isotope characteristics similar to depleted mantle, whereas those from the older West Karelian and Vodlozero domains have lower initial eNd values. The isotopic heterogeneity of the sanukitoids is interpreted to result from variations in the time interval between mantle source enrichment and the partial melting that produced the sanukitoid magmas. We therefore suggest a two-stage model of the generation of sanukitoid magmas. During first stage, the mantle was metasomatised by fluids and/or melts generated during subduction or tectonic underplating. Later, between 2.74 and 2.70 Ga, a tectonothermal anomaly generated the sanukitoid magmas by melting of the previously metasomatised mantle. Most of the sanukitoid intrusions are cut by calc-alkaline lamprophyre dykes that have the similar geochemical signatures to their sanukitoid wall rocks. New Sm–Nd isotope data for these lamprophyres suggest a genetic kinship between the sanukitoids and the lamprophyres. Comparison between chemical signatures of sanukitoids and modern, subduction-related magmas shows that Archaean sanukitoids actually have no modern analogues. Sanukitoid melts can be modelled as partial melts of mantle that had been metasomatised a short time previously. The melts could have been in equilibrium with residues containing Ol, Cpx plus minor Phl and Grt, at a pressure of about 2.5 GPa and a temperature of 1150–1230 8C. The small percentage of residual phlogopite would retain Rb in the mantle and explain the peculiar signature of low-Rb and high Ba and Sr, characteristic of the sanukitoids. We envisage a temporal evolution of the composition of the mantle in this region. This pattern of evolution controlled production of the sanukitoid melts and explains why the sanukitoids have such a restricted range of ages. Sanukitoid magma production must have followed from a major, global mantle enrichment event. These magmas could not have been produced earlier because the Archaean mantle had not become sufficiently enriched before 2.7 Ga. We suggest that their scarcity after the major period of sanukitoid magmatism may be due to the increased thickness of overlying crust, which can inhibit mantle enrichment. Article in Journal/Newspaper karelian Kingston University London: Research Repository Wall Rocks ENVELOPE(-129.312,-129.312,52.728,52.728) Lithos 79 1-2 147 160 |
institution |
Open Polar |
collection |
Kingston University London: Research Repository |
op_collection_id |
ftunivkingston |
language |
unknown |
topic |
Earth systems and environmental sciences Archaean Baltic shield Sanukitoid Sm–Nd Rb–Sr |
spellingShingle |
Earth systems and environmental sciences Archaean Baltic shield Sanukitoid Sm–Nd Rb–Sr Kovalenko, A. Clemens, J.D. Savatenkov, V. Petrogenetic constraints for the genesis of Archaean sanukitoid suites: geochemistry and isotopic evidence from Karelia, Baltic Shield |
topic_facet |
Earth systems and environmental sciences Archaean Baltic shield Sanukitoid Sm–Nd Rb–Sr |
description |
New Sm–Nd isotope data are presented for late Archaean sanukitoid suites of the Karelian granite-greenstone terrane of the Baltic Shield. Within the terrane, there are regional variations in the Nd isotope compositions of the sanukitoids. Sanukitoids in the youngest Central Karelian domain have Nd isotope characteristics similar to depleted mantle, whereas those from the older West Karelian and Vodlozero domains have lower initial eNd values. The isotopic heterogeneity of the sanukitoids is interpreted to result from variations in the time interval between mantle source enrichment and the partial melting that produced the sanukitoid magmas. We therefore suggest a two-stage model of the generation of sanukitoid magmas. During first stage, the mantle was metasomatised by fluids and/or melts generated during subduction or tectonic underplating. Later, between 2.74 and 2.70 Ga, a tectonothermal anomaly generated the sanukitoid magmas by melting of the previously metasomatised mantle. Most of the sanukitoid intrusions are cut by calc-alkaline lamprophyre dykes that have the similar geochemical signatures to their sanukitoid wall rocks. New Sm–Nd isotope data for these lamprophyres suggest a genetic kinship between the sanukitoids and the lamprophyres. Comparison between chemical signatures of sanukitoids and modern, subduction-related magmas shows that Archaean sanukitoids actually have no modern analogues. Sanukitoid melts can be modelled as partial melts of mantle that had been metasomatised a short time previously. The melts could have been in equilibrium with residues containing Ol, Cpx plus minor Phl and Grt, at a pressure of about 2.5 GPa and a temperature of 1150–1230 8C. The small percentage of residual phlogopite would retain Rb in the mantle and explain the peculiar signature of low-Rb and high Ba and Sr, characteristic of the sanukitoids. We envisage a temporal evolution of the composition of the mantle in this region. This pattern of evolution controlled production of the sanukitoid melts and explains why the sanukitoids have such a restricted range of ages. Sanukitoid magma production must have followed from a major, global mantle enrichment event. These magmas could not have been produced earlier because the Archaean mantle had not become sufficiently enriched before 2.7 Ga. We suggest that their scarcity after the major period of sanukitoid magmatism may be due to the increased thickness of overlying crust, which can inhibit mantle enrichment. |
format |
Article in Journal/Newspaper |
author |
Kovalenko, A. Clemens, J.D. Savatenkov, V. |
author_facet |
Kovalenko, A. Clemens, J.D. Savatenkov, V. |
author_sort |
Kovalenko, A. |
title |
Petrogenetic constraints for the genesis of Archaean sanukitoid suites: geochemistry and isotopic evidence from Karelia, Baltic Shield |
title_short |
Petrogenetic constraints for the genesis of Archaean sanukitoid suites: geochemistry and isotopic evidence from Karelia, Baltic Shield |
title_full |
Petrogenetic constraints for the genesis of Archaean sanukitoid suites: geochemistry and isotopic evidence from Karelia, Baltic Shield |
title_fullStr |
Petrogenetic constraints for the genesis of Archaean sanukitoid suites: geochemistry and isotopic evidence from Karelia, Baltic Shield |
title_full_unstemmed |
Petrogenetic constraints for the genesis of Archaean sanukitoid suites: geochemistry and isotopic evidence from Karelia, Baltic Shield |
title_sort |
petrogenetic constraints for the genesis of archaean sanukitoid suites: geochemistry and isotopic evidence from karelia, baltic shield |
publishDate |
2005 |
url |
https://eprints.kingston.ac.uk/id/eprint/236/ https://doi.org/10.1016/j.lithos.2004.05.006 |
long_lat |
ENVELOPE(-129.312,-129.312,52.728,52.728) |
geographic |
Wall Rocks |
geographic_facet |
Wall Rocks |
genre |
karelian |
genre_facet |
karelian |
op_relation |
Kovalenko, A., Clemens, J.D. and Savatenkov, V. (2005) Petrogenetic constraints for the genesis of Archaean sanukitoid suites: geochemistry and isotopic evidence from Karelia, Baltic Shield. Lithos, 79(1-2), pp. 147-160. ISSN (print) 0024-4937 |
op_doi |
https://doi.org/10.1016/j.lithos.2004.05.006 |
container_title |
Lithos |
container_volume |
79 |
container_issue |
1-2 |
container_start_page |
147 |
op_container_end_page |
160 |
_version_ |
1766054608390586368 |