Age and chemical composition of magmatic rocks from the Belkovsky Island, New Siberian Islands ...
The study was inspired by information on Paleozoic andesites, dacites, and diabases on the Belkovsky Island in the 1974 geological survey reports used to reconstruct tectonic evolution of the continental block comprising the New Siberian Islands and the bordering shelf. We did not find felsic volcan...
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| Format: | Article in Journal/Newspaper |
| Language: | English |
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PANGAEA
2008
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| Online Access: | https://dx.doi.org/10.1594/pangaea.783103 https://doi.pangaea.de/10.1594/PANGAEA.783103 |
| Summary: | The study was inspired by information on Paleozoic andesites, dacites, and diabases on the Belkovsky Island in the 1974 geological survey reports used to reconstruct tectonic evolution of the continental block comprising the New Siberian Islands and the bordering shelf. We did not find felsic volcanics or Middle Paleozoic intrusions in the studied area of the island. Igneous rocks are mafic subvolcanic intrusions including dikes, randomly shaped bodies, explosion breccias, and peperites. They belong to the tholeiitic series and are similar to Siberian traps in petrography and trace-element compositions, with high LREE and LILE and prominent Nb negative anomalies. The island arc affinity is due to continental crust contamination of mantle magma and its long evolution in chambers at different depths. K-Ar biotite age (252+/-5 Ma) of magmatism indicates that it was coeval to the main stage of trap magmatism in the Siberian craton at the Permian-Triassic boundary. The terrane including the New Siberian Islands ... : Supplement to: Kuzmichev, A B; Goldyrev, A E (2008): Permian-Triassic trap magmatism in Bel'kov Island (New Siberian Islands). Translated from Geologiya i Geofizika, 2007, 48(2), 216-228, Russian Geology and Geophysics, 48(2), 167-176 ... |
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