New Data on the Ages of the Basement of the Central Kamchatka Depression and the Pedestal of the Kvechovo Group of Volcanoes

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Abstract

A unique feature of the Kamchatka Peninsula is the Central Kamchatka Depression (CKD) stretching 400 km along the peninsula. Existing geodynamic models connect the formation of the CKD with the extension of the East Kamchatka toward the Pacific Ocean due to the slab rollback. However, no radiometric ages of the CKD formation have known yet, thus making it impossible to directly link the emergence of the CKD to the stages of Kamchatka tectonic evolution of and to the recent tectonic deformations. The paper presents the results of XRF analysis and K-Ar dating of lavas from the Kl-1 borehole near the Klyuchi settlement. Samples from the depth interval of 50–475 m (ages 0.72 ± 0.05, 1.54 ± 0.15 and 1.46 ± 0.08 M a) correspond to medium-K basalts and high-K trachyandesibasalts, likely similar to the rocks exposed at the base of the Kliuchevskaia Group. Still, these studied rocks are much older than any other dated rocks of the Kliuchevskaia Group (dates does not exceed 0.3 Ma). Below the stratigraphic unconformity at a depth of 905 m, a single date of 3.5 ± 0.4 Ma was obtained, which coincide with the end of accretion of the Eastern Peninsulas, which caused the transverse compression across the peninsula. Thus, the time of CDD emergence likely falls within the range of 1.5–3.5 Ma.

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About the authors

E. A. Zelenin

Geological Institute of the Russian Academy of Sciences

Author for correspondence.
Email: egorzelenin@mail.ru
Russian Federation, Moscow

N. V. Gorbach

Institute of Volcanology and Seismology of the Far Eastern Branch of the Russian Academy of Sciences

Email: egorzelenin@mail.ru
Russian Federation, Petropavlovsk-Kamchatsky

S. A. Sokolov

Geological Institute of the Russian Academy of Sciences

Email: egorzelenin@mail.ru
Russian Federation, Moscow

V. A. Lebedev

Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences

Email: egorzelenin@mail.ru
Russian Federation, Moscow

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2. Fig. 1. Position of the Central Kamchatka Depression (CKD) on the map of the Kamchatka Peninsula. The yellow fill shows the distribution of Quaternary sediments within the CKD and other large grabens [1], the red fill shows the position of volcanic belts. Black lines show the largest discharge zones. The square shows the position of well KL-1

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3. Fig. 2. Lithological column of well KL-1. 1 - sandy-boulder bed, 2 - 4 - lavas (2 - basalts, 3 - andesibasalts, 4 - andesites), 5-6 - tuffs (5 - basic, 6 - medium composition), 7 - sampling points for K-Ar dating (sample indices and age in Ma are signed)

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4. Fig. 3. Estimates of the thickness of the sedimentary filling of the CKD (1 - according to [11], 2 - according to [16], 3 - borehole Kl-1) and the age of the volcanics reaching the day surface (4 - Upper Pleistocene - Holocene [17], 5 - Middle Pleistocene and older, including the points of absolute age determination in million years [12 - 15]; 6 - distribution of Quaternary sediments within the CKD)

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