Paleomagnetism of the Miocene Magmatic Rocks of the Southern Kamchatka

Мұқаба

Дәйексөз келтіру

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Аннотация

Reconstruction of the tectonic evolution of Kamchatka is extremely important for understanding the formation mechanisms of folded belts and development of subduction systems. In this context, obtaining reliable paleomagnetic data from poorly studied segments of the Koryak-Kamchatka folded region, such as southern Kamchatka, is essential. This paper presents the first paleomagnetic data from the Miocene magmatic rock bodies of the Pribrezhny complex, which is widespread along the Pacific coast of southern Kamchatka. Based on 33 sites, the paleomagnetic pole for the Miocene of the southern Kamchatka was calculated, which is statistically significantly different from all published Cenozoic poles for nearby regions. The new data suggest that Miocene volcanic rocks formed at a paleolatitude close to their current position (52.3°), and indicate the origin of the Miocene supra-subduction volcanic belt on the more ancient base of the Olyutor-Kamchatka folded system, and not within a separate exotic block. It is shown that most of the sampled volcanics were formed before the main phase of tectonic deformations, but at least some of the studied bodies of normal polarity contain post-folding magnetization and may represent products of younger magmatic episodes.

Толық мәтін

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Авторлар туралы

A. Latyshev

Lomonosov Moscow State University; Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences; Institute of Volcanology and Seismology of the Far Eastern Branch of the Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: anton.latyshev@gmail.com
Ресей, Moscow; Moscow; Petropavlovsk-Kamchatsky

M. Anosova

Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences; Institute of Volcanology and Seismology of the Far Eastern Branch of the Russian Academy of Sciences

Email: anton.latyshev@gmail.com
Ресей, Moscow; Petropavlovsk-Kamchatsky

E. Latanova

Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences; MISIS National University of Science and Technology

Email: anton.latyshev@gmail.com
Ресей, Moscow; Moscow

O. Bergal-Kuvikas

Institute of Volcanology and Seismology of the Far Eastern Branch of the Russian Academy of Sciences; Vitus Bering Kamchatka State University

Email: anton.latyshev@gmail.com
Ресей, Petropavlovsk-Kamchatsky; Petropavlovsk-Kamchatsky

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2. Fig. 1. Geological scheme of the area (according to [Sheimovich and Patoka, 1989, with modifications]): 1 - Eocene-Quaternary terrigenous sediments; 2 - Pleistocene-Holocene volcanogenic formations; 3 - Pliocene volcanic rocks predominantly of basalt-andesibasalt composition; 4 - Pliocene-Pleistocene volcanic rocks predominantly of dacite-rhyolite composition; 5 - Miocene magmatic formations of the coastal complex; 6 - Cretaceous magmatic and metamorphic formations; 7 - large Quaternary volcanic centres; 8 - sampling points; 9 - boundaries of the Malko-Petropavlovsk zone of transverse dislocations. The inset shows the boundaries of tectonic zones according to [Zonenshain et al., 1990; Nikishin et al., 2009], with changes: I - Koryak-West Kamchatka terrane belt; II - Olyutor-Middle Kamchatka terrane belt; III - Kronotsky terrane.

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3. Fig. 2. Electron microscopic images of magnetic minerals in the studied igneous rocks: (a) - homogeneous unaltered crystals of titanomagnetite in gabbroids, site 17. 2-21; (b) - magnetite grains with structures of high-temperature heterophase oxidation, granodiorites, site 19-22; (c) - large magnetite grain with structures of single-phase oxidation, andesite dyke, site 10-22; (d) - primary magmatic inclusions of magnetite in amphibole, granodiorites of the Akhomten massif, site 19-22; (e) - magnetite with ilmenite lamellae in gabbroids, site 21-21; (f) - pyrite accumulation in rhyolites, site 6-21.

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4. Fig. 3. Magnetic properties of the studied samples. (a)-(d) - temperature curves of magnetic susceptibility dependence: (a) - site 21-21, gabbro; (b) - site 11-21, andesites; (c) - site 19-22, granodiorites; (d) - site 6-21, rhyolites. (e) - Day-Dunlop diagram [Day et al., 1977; Dunlop, 2002]. Ms - saturation magnetisation, Mrs - residual saturation magnetisation, Hc - coercivity, Hcr - residual coercivity. Fields in the diagram: SD - single-domain grains, PSD - pseudo-single-domain grains, MD - multi-domain grains.

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5. Fig. 4. Results of temperature demagnetisation and alternating field cleaning: (a) sample 219, site 18-22 (rhyolitic tuffs); (b) sample 193, site 16-22 (andesites); (c) sample 241, site 20-22 (montsodiorites); (d) sample 151, site 12-22 (andesites); (e) sample 195, site 17.2-21 (dolerites); (f) sample 181, site 7-21 (basalts). The coordinate system is stratigraphic.

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6. Fig. 5. Distribution of average palaeomagnetic directions by sites: (a) - geographic coordinate system; (b) - stratigraphic coordinate system. Filled circles - direct polarity, hollow circles - reverse polarity.

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7. Fig. 6. (a) - Mean directions for directional groups: I - forward polarity, geographic coordinate system; II - reverse polarity, stratigraphic coordinate system. The asterisk shows the direction of the modern geomagnetic field; (b) - Palaeomagnetic pole for the Miocene of southern Kamchatka and its comparison with published data. 1 - mean pole for Miocene volcanics of the coastal complex (this paper); 2-5 - results of predecessors: 2 - Eocene, Kronotsky terrane [Levashova et al., 2000]; 3 - Eocene-Oligocene, Ilpinsky Peninsula [Kovalenko, 1992]; 4 - Eocene, Kronotsky terrane [Pechersky et al., 1997]; 5 - Oligocene-Miocene, western Kamchatka [Kazansky et al., 2021].

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