<sup>40</sup>Ar/<sup>39</sup>Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia)
The alkaline igneous rocks of the Chompolo field (Aldan shield, Siberian craton), previously defined as kimberlites or lamproites, are more correctly classified as low-Ti lamprophyres. The emplacement age of the Ogonek pipe (137.8 ± 1.2 Ma) and the Aldanskaya dike (157.0 ± 1.6 Ma) was obtained using...
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MDPI AG
2020-10-01
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| Series: | Minerals |
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| author | Evgeny I. Nikolenko Konstantin V. Lobov Alexey M. Agashev Nikolay S. Tychkov Maria V. Chervyakovskaya Igor S. Sharygin Anna M. Nikolenko |
| author_facet | Evgeny I. Nikolenko Konstantin V. Lobov Alexey M. Agashev Nikolay S. Tychkov Maria V. Chervyakovskaya Igor S. Sharygin Anna M. Nikolenko |
| author_sort | Evgeny I. Nikolenko |
| collection | DOAJ |
| description | The alkaline igneous rocks of the Chompolo field (Aldan shield, Siberian craton), previously defined as kimberlites or lamproites, are more correctly classified as low-Ti lamprophyres. The emplacement age of the Ogonek pipe (137.8 ± 1.2 Ma) and the Aldanskaya dike (157.0 ± 1.6 Ma) was obtained using <sup>40</sup>Ar/<sup>39</sup>Ar K-richterite dating. The Chompolo rocks contain abundant xenocrysts of mantle minerals (chromium-rich pyropic garnets, Cr-diopsides, spinels, etc.). The composition of the mantle xenocrysts indicates the predominance of spinel and garnet–spinel lherzolites, while the presence of garnet lherzolites, dunites, harzburgites, and eclogites is minor. The Chompolo rocks are characterized by large-ion lithophile element (LILE) and Light Rare Earth Element (LREE) enrichments, and high field strength element (HFSE) depletions. The rocks of the Ogonek pipe have radiogenic Sr (<sup>87</sup>Sr/<sup>86</sup>Sr (t) = 0.70775 and 0.70954), and highly unradiogenic εNd<sub>(t)</sub> (−20.03 and −20.44) isotopic composition. The trace element and isotopic characteristics of the Chompolo rocks are indicative of the involvement of subducted materials in their ancient enriched lithospheric mantle source. The Chompolo rocks were formed at the stage when the Mesozoic igneous activity was triggered by global tectonic events. The Chompolo field of alkaline magmatism is one of the few available geological objects, which provides the opportunity to investigate the subcontinental lithospheric mantle beneath the south part of the Siberian craton. |
| first_indexed | 2024-03-10T15:48:29Z |
| format | Article |
| id | doaj.art-2087e1061387476d85dc1f582718a26d |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T15:48:29Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-2087e1061387476d85dc1f582718a26d2023-11-20T16:12:12ZengMDPI AGMinerals2075-163X2020-10-01101088610.3390/min10100886<sup>40</sup>Ar/<sup>39</sup>Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia)Evgeny I. Nikolenko0Konstantin V. Lobov1Alexey M. Agashev2Nikolay S. Tychkov3Maria V. Chervyakovskaya4Igor S. Sharygin5Anna M. Nikolenko6Geo-Scientific Research Enterprise ALROSA (PJSC), Chernyshevskoe Highway 16, 678170 Mirny, Republic of Sakha (Yakutia), RussiaSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, 630090 Novosibirsk, RussiaSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, 630090 Novosibirsk, RussiaSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, 630090 Novosibirsk, RussiaZavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Science, Akademika Vonsovskogo Str. 15, 620016 Ekaterinburg, RussiaInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, Lermontov Str. 128, 664033 Irkutsk, RussiaSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, 630090 Novosibirsk, RussiaThe alkaline igneous rocks of the Chompolo field (Aldan shield, Siberian craton), previously defined as kimberlites or lamproites, are more correctly classified as low-Ti lamprophyres. The emplacement age of the Ogonek pipe (137.8 ± 1.2 Ma) and the Aldanskaya dike (157.0 ± 1.6 Ma) was obtained using <sup>40</sup>Ar/<sup>39</sup>Ar K-richterite dating. The Chompolo rocks contain abundant xenocrysts of mantle minerals (chromium-rich pyropic garnets, Cr-diopsides, spinels, etc.). The composition of the mantle xenocrysts indicates the predominance of spinel and garnet–spinel lherzolites, while the presence of garnet lherzolites, dunites, harzburgites, and eclogites is minor. The Chompolo rocks are characterized by large-ion lithophile element (LILE) and Light Rare Earth Element (LREE) enrichments, and high field strength element (HFSE) depletions. The rocks of the Ogonek pipe have radiogenic Sr (<sup>87</sup>Sr/<sup>86</sup>Sr (t) = 0.70775 and 0.70954), and highly unradiogenic εNd<sub>(t)</sub> (−20.03 and −20.44) isotopic composition. The trace element and isotopic characteristics of the Chompolo rocks are indicative of the involvement of subducted materials in their ancient enriched lithospheric mantle source. The Chompolo rocks were formed at the stage when the Mesozoic igneous activity was triggered by global tectonic events. The Chompolo field of alkaline magmatism is one of the few available geological objects, which provides the opportunity to investigate the subcontinental lithospheric mantle beneath the south part of the Siberian craton.https://www.mdpi.com/2075-163X/10/10/886Siberian cratonAldan shieldalkaline magmatismmantle sourcelamprophyretrace elements |
| spellingShingle | Evgeny I. Nikolenko Konstantin V. Lobov Alexey M. Agashev Nikolay S. Tychkov Maria V. Chervyakovskaya Igor S. Sharygin Anna M. Nikolenko <sup>40</sup>Ar/<sup>39</sup>Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia) Minerals Siberian craton Aldan shield alkaline magmatism mantle source lamprophyre trace elements |
| title | <sup>40</sup>Ar/<sup>39</sup>Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia) |
| title_full | <sup>40</sup>Ar/<sup>39</sup>Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia) |
| title_fullStr | <sup>40</sup>Ar/<sup>39</sup>Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia) |
| title_full_unstemmed | <sup>40</sup>Ar/<sup>39</sup>Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia) |
| title_short | <sup>40</sup>Ar/<sup>39</sup>Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia) |
| title_sort | sup 40 sup ar sup 39 sup ar geochronology and new mineralogical and geochemical data from lamprophyres of chompolo field south yakutia russia |
| topic | Siberian craton Aldan shield alkaline magmatism mantle source lamprophyre trace elements |
| url | https://www.mdpi.com/2075-163X/10/10/886 |
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