The First Discovery of Archean Dolerite Dikes in the Western Part of the Aldan Shield
- Autores: Erofeeva K.1, Larionova U.1, Samsonov A.1
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Afiliações:
- Institute of Ore Geology, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences
- Edição: Volume 32, Nº 2 (2024)
- Páginas: 218-229
- Seção: Articles
- URL: https://journals.rcsi.science/0869-5903/article/view/259754
- DOI: https://doi.org/10.31857/S0869590324020058
- EDN: https://elibrary.ru/DCIFZH
- ID: 259754
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Resumo
In the western part of the Aldan terrane, in the middle reaches of the Tokko river, dolerite dikes have been studied. These dolerite dikes form a swarm of submeridional trend about 1 km wide. In the thickest dike, dolerites have well-preserved primary textural and structural features and mineral composition: plagioclase + pigeonite + augite + titanomagnetite. Dolerites from the chilled margins and inner parts of the dike are homogeneous in composition, correspond to low-Mg tholeiites, have low contents of Ti and other HFSE, with weak enrichments in light REE spectra and small negative Nb anomalies. Sm-Nd isotopic studies of magmatic dolerite minerals from the central part of the dike in isochron coordinates yielded a good linear correlation corresponding to an age of 2510 ± 64 Ma, which probably records the time of crystallization of the basaltic melt. The metadolerites in the shallow dike retain plagioclase-porphyritic structures, but the pyroxenes in them are completely replaced by amphibole and chlorite. Metadolerites are contrasted by low contents of MgO, Cr and Ni and higher contents of TiO2, Fe2O3, P2O5, Nb and all REEs. The differences in the composition of the dikes may be related to the long-term (about 65%) crystallization differentiation of the initial melt and the flow of residual melt from the shallow intermediate magmatic chamber along the opening cracks. Such conditions probably existed in tectonically stable intraplate settings. The age of the studied dolerites of the dike swarm is comparable to that of the anorogenic granites of the Nelyuki Complex (~2.4–2.5 Ga), which are widespread in the western part of Aldan granulite-gneiss Terrane. The data obtained complement the characterization of the intraplate anorogenic magmatism that occurred in the western part of the Aldan Shield in the Late Archean and marked the final consolidation of a large block of Archean crust in the Chara-Olekma granite-greenstone area.
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Sobre autores
Kseniia Erofeeva
Institute of Ore Geology, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences
Autor responsável pela correspondência
Email: xenin.erofeeva@ya.ru
Rússia, Moscow
Ulia Larionova
Institute of Ore Geology, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences
Email: xenin.erofeeva@ya.ru
Rússia, Moscow
Aleksandr Samsonov
Institute of Ore Geology, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences
Email: samsonov@igem.ru
Rússia, Moscow
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