Pliocene-Quaternary Volcanism in the Interfluve of the Kozyrevka and Malaya Romanovka Rivers (Sredinny Range of Kamchatka): Age and Composition of the Rocks

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Рұқсат ақылы немесе тек жазылушылар үшін

Аннотация

The isotopic K–Ar age of volcanoes in interfluve of the Kozyrevka and Malaya Romanovka rivers in the Sredinny Range of Kamchatka has been established for the first time. Six stages of activation have been identified: the termination of the Miocene (5.8–5.5 Ma), the Early Pliocene (4.9–4.5 Ma), the Middle Eopleistocene (1.5–1.4 Ma), the Late Eopleistocene (1.1–1.0 Ma), the Middle Pleistocene (0.4–0.3 Ma). No more recent volcanic activity has been recorded in the area. It has been established that the beginning of Quaternary volcanic activity was preceded by a period of rest lasting about 3 million years. It has been established for the first time that the formation of a large fault of the upper strike occurred at the northern foot of the Romanovka volcano no earlier than 0.4–0.3 million years ago. The analysis of K–Ar isotopic dates allowed us to suggest that the activation stages of Quaternary volcanic activity at ~1.5 and ~0.3 Ma had a regional character. The regional activity is less clearly traced for the stages of ~1.0 and ~0.6 Ma. Over the last six Ma, rocks ranging from basalts to dacites have erupted in the interfluve. It was found that extensive covers and large lava structures are composed of rocks of medium and acidic composition, while basalts are confined to small monogenic centers. In general, the studied volcanics are chemically similar to the Late Miocene-Quaternary rocks of the southern part of the Sredinny Range. The results of our work fundamentally change the previously existing estimates of the age of volcanoes in the studied area of the Sredinny Range. It is suggested that there were no significant glaciations in the interfluve of Kozyrevka and Malaya Romanovka at least in the Quaternary.

Авторлар туралы

M. Pevzner

Geological Institute RAS

Email: m_pevzner@mail.ru
Pyzhevsky lane, 7, bld. 1, Moscow, 119017 Russia

M. Tolstykh

Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Kosygina str., 19, Moscow, 119334 Russia

V. Lebedev

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS

Staromonetny lane, 35, Moscow, 119017 Russia

A. Babansky

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS

Staromonetny lane, 35, Moscow, 119017 Russia

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