Rocks of the Western Kamchatka-Koryak continental margin volcanogenic belt: age, chemical and mineral compositions ...
An isotope-geochemical study of Eocene-Oligocene magmatic rocks from the Western Kamchatka-Koryak volcanogenic belt revealed lateral heterogeneity of mantle magma sources in its segments: Western Kamchatka, Central Koryak, and Northern Koryak ones. In the Western Kamchatka segment magmatic melts wer...
| Main Authors: | , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
2011
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.788661 https://doi.pangaea.de/10.1594/PANGAEA.788661 |
| Summary: | An isotope-geochemical study of Eocene-Oligocene magmatic rocks from the Western Kamchatka-Koryak volcanogenic belt revealed lateral heterogeneity of mantle magma sources in its segments: Western Kamchatka, Central Koryak, and Northern Koryak ones. In the Western Kamchatka segment magmatic melts were generated from isotopically heterogeneous (depleted and/or insignificantly enriched) mantle sources significantly contaminated by quartz-feldspathic sialic sediments; higher 87Sr/86Sr (0.70429-0.70564) and lower 143Nd/144Nd [eNd(T) = 0.06-2.9] ratios in volcanic rocks from the Central Koryak segment presumably reflect contribution of an enriched mantle source; high positive eNd(T) and low 87Sr/86Sr ratios in magmatic rocks from the Northern Koryak segment area indicate their derivation from an isotopically depleted mantle source without significant contamination by sialic or mantle material enriched in radiogenic Sr and Nd. Significantly different contamination histories of Eocene-Oligocene mantle magmas in ... : Supplement to: Fedorov, P I; Kovalenko, D V; Ageeva, O A (2011): Western Kamchatka-Koryak continental margin volcanogenic belt: Age, composition, and sources. Translated from Geokhimiya, 2011, 49(8), 813-838, Geochemistry International, 49(8), 768-792 ... |
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