Abstract
In terms of tectonics, the Sea of Okhotsk (Fig.1) is the epi-Mesozoic Okhotsk plate comprising the heterogeneous basement that is mainly pre-Cenozoic (the lower structural stage) and the sedimentary cover that is mainly represented by the Paleogenic-Neogenic-Quaternary deposits with the Upper Cretaceous sedimentary rocks observed locally without a visible hiatus (the upper structural stage). Results of tectonic zoning of the sedimentary cover based on lithophysical indicators (Fig. 2) are represented in the format of maps showing lithophysical complexes (LC) within the limits of four regional seismo-stratigraphic complexes/structural layers (RSSC I-IV) corresponding to the following time intervals: the pre-Oligocene К 2 -P 1-2 (RSSC I), the Oligocene – Lower Miocene P 3 -N 1 1 (RSSC II), the Lower-Mid Miocene N 1 1-2 (RSSC III), and the Upper Miocene – Pliocene N 1 3 -N 2 (RSSC IV). Diverse lithological-facies associations composing the RSSCs are grouped into the following lithophysical complexes (LC): 1 - coal-bearing silty-clayey-sandy terrigenous, 2 - sandy-silty-clayey terrigenous, 3 - silty-clayey-siliceous, and 4 - sandy-silty-clayey volcanic [Sergeyev, 2006]. Tectonic zoning of the sedimentary cover based on structural indicators is carried out with reference to the sediment-thickness map [Sergeyev, 2006], including a significantly revised segment showing the area of the Deryugin basin [Semakin, Kochergin, 2013]. Results of such zoning are represented in the format of a structural-tectonic map (Fig. 3) showing orientations and morphology of the structural elements of the sedimentary cover, the thickness of the sedimentary cover, and amplitudes of relative uplifts and troughs. With reference to the structural-tectonic map (see Fig 3), the structural elements of different orders are grouped by their sizes, spatial positions and orientations and thus comprise tectonic sistems (Fig. 4), structural zones (Fig. 5) that unclude relative uplifts and troughs that are considered as structural elements of smaller sizes (Fig. 6) Tectonic zoning of the sedimentary cover based on the structural-lithophysical indicators (Fig. 7-10) is carried out with reference to the maps of the lithophysical complexes of the four regional seismo-stratigraphic complexes/structural layers (see Fig. 2) and the map of high-order structural elements in the sedimentary cover (see Fig. 6).
Highlights
With reference to the structuraltectonic map, the structural elements of different orders are grouped by their sizes, spatial positions and orientations and comprise tectonic sistems (Fig. 4), structural zones (Fig. 5) that unclude relative uplifts and troughs that are considered as structural elements of smaller sizes (Fig. 6)
Tectonic zoning of the sedimentary cover based on the structurallithophysical indicators (Fig. 7 10) is carried out with reference to the maps of the lithophysical complexes of the four regional seismostratigraphic complexes/structural layers and the map of highorder structural elements in the sedimentary cover
Tectonic zoning of the sedimentary cover in the Deryugin basin of the Sea of Okhotsk based on structural-material (lithophysical) indicators
Summary
Результатами ранее проведенных исследований установлено, что Охотское море (рис. 1) характеризу ется высоким уровнем содержания метана [Kulinich, Obzhirov, 2003; Obzhirov et al, 1999; Obzhirov et al, 2012], интенсивной бариткарбонатной минерализаци ей [Astakhova, Sorochinskaya, 2001; Kulinich, Obzhirov, 2003; Obzhirov et al, 1999], наличием железомарган цевых образований [Astakhova, Sattarova, 2005], ртути [Astakhov et al, 2007] и других рудных элементов [Astakhov et al, 2005]. Результатами ранее проведенных исследований установлено, что Охотское море В Охотском море выявлены га зовые гидраты [Obzhirov et al, 2007; Telegin, 2011; Veselov et al, 2000], а с целью оценки углеводородного потенциала в Охотоморском регионе выделены и опи саны в рамках четырех региональных сейсмострати графических комплексов (РССК IIV) десять осадочно породных бассейнов (ОПБ) [Sergeyev, 2006]. Выделение и характеристика оса дочнопородных бассейнов на акватории находятся в тесной зависимости от детальности геологогеофизи ческой изученности. С учетом вышеприведенного, нами впервые для всей территории Охотского моря выполнено комплексное тектоническое районирование осадочного чехла по литофизическим, структурным и структурнолитофизическим признакам. Районирова ние осадочного чехла по структурным признакам про ведено также для островного склона Курильского же лоба. Подобный принцип тектонического районирова ния осадочного чехла предложен и апробирован нами ранее на примере района впадины Дерюгина (Охот ское море) [Semakin, Kochergin, 2013]
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