New data on the Early Cenozoic volcanism of the Kolyuchinskii-Mechigmen graben, Chukotka Peninsula
The isotopic-geochemical composition of the Late Paleocene-Early Eocene basalts in the central part of the Kolyuchinskii-Mechigmen graben on the east of the Chukotka Peninsula is studied. The distribution of major and trace elements and the elemental ratios point to the formation of basalts under co...
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| Veröffentlicht in: | Doklady earth sciences 2014-10, Vol.458 (2), p.1201-1206 |
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| creator | Fedorov, P. I. Smirnov, V. N. |
| description | The isotopic-geochemical composition of the Late Paleocene-Early Eocene basalts in the central part of the Kolyuchinskii-Mechigmen graben on the east of the Chukotka Peninsula is studied. The distribution of major and trace elements and the elemental ratios point to the formation of basalts under conditions of marginal-continental rifting. The basalts of Mount Otdel’naya are characterized by a combination of depleted, intraplate, and suprasubduction geochemical features, which differentiates them both from the rocks of suprasubduction volcanic belts and tholeiites and alkaline lavas of the continental rifts and oceanic island arcs. The specific peculiarities of basalts of Mount Otdel’naya are extremely high, relative to similar basalts of spreading zones of the region and the
87
Sr/
86
Sr ratios, which reflect the involvement of carbonate material in the magma generation zone. |
| doi_str_mv | 10.1134/S1028334X14100055 |
| format | Article |
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I.</au><au>Smirnov, V. N.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>New data on the Early Cenozoic volcanism of the Kolyuchinskii-Mechigmen graben, Chukotka Peninsula</atitle><jtitle>Doklady earth sciences</jtitle><stitle>Dokl. Earth Sc</stitle><date>2014-10-01</date><risdate>2014</risdate><volume>458</volume><issue>2</issue><spage>1201</spage><epage>1206</epage><pages>1201-1206</pages><issn>1028-334X</issn><eissn>1531-8354</eissn><abstract>The isotopic-geochemical composition of the Late Paleocene-Early Eocene basalts in the central part of the Kolyuchinskii-Mechigmen graben on the east of the Chukotka Peninsula is studied. The distribution of major and trace elements and the elemental ratios point to the formation of basalts under conditions of marginal-continental rifting. The basalts of Mount Otdel’naya are characterized by a combination of depleted, intraplate, and suprasubduction geochemical features, which differentiates them both from the rocks of suprasubduction volcanic belts and tholeiites and alkaline lavas of the continental rifts and oceanic island arcs. The specific peculiarities of basalts of Mount Otdel’naya are extremely high, relative to similar basalts of spreading zones of the region and the
87
Sr/
86
Sr ratios, which reflect the involvement of carbonate material in the magma generation zone.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S1028334X14100055</doi><tpages>6</tpages></addata></record> |
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| subjects | Basalt Cenozoic Earth and Environmental Science Earth Sciences Eocene Geochemistry Geology Geophysics Graben Island arcs Magma Marine Paleocene Rifting Seismology Trace elements Volcanic belts Volcanism Volcanology |
| title | New data on the Early Cenozoic volcanism of the Kolyuchinskii-Mechigmen graben, Chukotka Peninsula |
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