Ожидаемые Геолого-Геоморфологические Риски По Трассе Северного Морского Пути

According to the results of analysis of 99 samples of bottom sediments and submarine permafrost from wells 1D-14, 3D-14 and 1D-15 drilled in the Buor-Khaya Bay, differences in their mineral composition due to paleogeographic factors, namely Late Quaternary changes in climate and sea level, as well as regional hydrodynamics are shown. The basis of the light fraction of minerals was quartz and feldspar (mainly plagioclases), found in the form of grains of various dimensions and sorting degree, as well as fine grains. To a lesser extent, the presence of chlorites, kaolinite and serpentines is noted, illite and smectite are rare. 42 accessory minerals were identified in the heavy fraction (average yield 0.95%) concentrated in fine-grained sands. It mainly consists of pyroxenes, amphiboles, carbonatite, epidote, zoisite, magnetite, mica, garnet, limonite, sphene, leucoxene, ilmenite. Rutile, kyanite, sillimanite, zircon, tourmaline, apatite, and stavrolite were found in smaller quantities. In the studied strata, plant remnants and carbon-like particles (kerogen) are found, the contribution of which exceeds 5% by weight in a number of samples. The results of the study allowed to conclude that the basis of the petrofund of the studied deposits are most likely sedimentary rocks of the Kharaulakh ridge of the Verkhoyansk mountain system (sandstones, siltstones and mudstones). The presence of characteristic accessory minerals in the sediments marks the unloading of igneous and metamorphic rocks, but their contribution is subordinate. They probably also include rocks of the Verkhoyansk complex, common near the Tiksi.

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Elemental Composition of Bottom Sediments and Permafrost Deposits From the Buor-Khaya Bay (Laptev Sea)

Ulyantsev,

Polyakova

2024

Moscow University Bulletin Series 4 Geology

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The paper summarizes data on the lithological and elemental composition of bottom sediments and permafrost from boreholes 1D-14, 3D-14 and 1D-15 drilled in Buor-Khaya Bay in 2014-2015. Based on the results of determining the percentage content of SiO2, Al2O3, Fe2O3, TiO2, MgO, Na2O, K2O, CaO, MnO, P2O5, Cl, Cr, S, Ni, Cu, Zn, Rb, Sr, Ba, Y, Zr, organic carbon in sediments, lithochemical modules values were calculated and comparative analysis of the lithological and geochemical composition was performed. Principal differences between near-continental (1D-14 and 3D-14) and relatively distant from land (1D-15) strata were established, which is explained by spatial and temporal variability in sedimentary fluxes and weathering crust activity in the studied area of the Laptev Sea. The results of the study allowed to conclude that the basis of the petrofund of the studied deposits are most likely sedimentary rocks of the Kharaulakh ridge of the Verkhoyansk mountain system (sandstones, siltstones and mudstones). The contribution of igneous and metamorphic rocks to the sedimentary supply in the strata uncovered by drilling was insignificant.

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Ожидаемые Геолого-Геоморфологические Риски По Трассе Северного Морского Пути

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Comparative lithological characteristics of modern sediments of the Kara and Pechora Seas

Comparative lithological characteristics of modern sediments of the Kara and Pechora Seas

Comparative Analysis of the Mineral Associations in the Sediments from Buor-Khaya Bay

Elemental Composition of Bottom Sediments and Permafrost Deposits From the Buor-Khaya Bay (Laptev Sea)

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