New Data on the Structure of the Laptev Sea Flank of the Gakkel Ridge (Arctic Ocean)

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
D. V. Kaminsky, N. P. Chamov, D. M. Zhilin, A. A. Krylov, I. A. Neevin, M. I. Bujakaite, K. E. Degtyarev, A. S. Dubensky, V. D. Kaminsky, E. A. Logvina, O. I. Okina, P. B. Semenov, A. O. Kil, B. G. Pokrovsky, T. Yu. Tolmacheva
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Abstract

The article provides new data on the structure of the Laptev Sea flank of the Gakkel Ridge. The intensive supply of clastic material from the Laptev Sea shelf leads to the development of a thick alluvial fan at the continental rise, which determines the structure of the bottom topography. In the northwestern direction, the influence of the fan decreases and tectonics becomes the main relief-forming factor. The bathymetric survey traced the asymmetrical rift valley of the Gakkel Ridge, the western flank of which is complicated by terraces. The presence of fault structures, bottom subsidence, extensive sediment supply, and the widespread development of subaqueous slump processes indicate the high neotectonic activity of the Laptev Sea flank of the Gakkel Ridge. For the first time in this region, numerous carbonate rocks have been discovered, the authigenic cement of which is represented by magnesian calcite or aragonite with an admixture of terrigenous material. The palynological and micropaleontological analysis of the carbonate rocks indicates the Quaternary formation of authigenic carbonate cement. An important role in the formation of authigenic carbonates was played by diagenetic solutions coming from the sedimentary cover together with methane and oxidation products of gases and organic matter. The authigenic carbonates were precipitated mainly in an isotopic equilibrium with bottom water at a temperature of about 0°C. The negative correlation between 87Sr/86Sr and δ13C indicates the presence of at least two different sources of carbonate-forming solutions.

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关于加克尔海脊拉普捷夫海侧(北冰洋)结构的新数据
文章提供了有关加克尔海脊拉普捷夫海侧翼结构的新数据。来自拉普捷夫海大陆架的大量碎屑物质导致在大陆隆起处形成厚厚的冲积扇,从而决定了海底地形的结构。在西北方向,冲积扇的影响减弱,构造成为形成地形的主要因素。水深测量描绘了加克尔海脊的非对称裂谷,其西侧有复杂的阶地。断层结构的存在、海底沉降、大量沉积物的供应以及水下坍塌过程的广泛发展表明,加克尔海脊拉普捷夫海侧的新构造活动十分活跃。该地区首次发现了大量碳酸盐岩,其自生胶结物为镁质方解石或霰石,并掺杂有陆相物质。对碳酸盐岩的古植物学和微古生物学分析表明,自生碳酸盐胶结物形成于第四纪。来自沉积覆盖层的成岩溶液以及甲烷、气体和有机物的氧化产物在自生碳酸盐的形成过程中发挥了重要作用。自生碳酸盐主要是在与温度约为 0°C 的底层水保持同位素平衡的情况下沉淀的。87Sr/86Sr 与 δ13C 之间的负相关表明,碳酸盐形成溶液至少有两种不同的来源。
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来源期刊
Lithology and Mineral Resources
Lithology and Mineral Resources 地学-地球化学与地球物理
CiteScore
1.30
自引率
37.50%
发文量
29
审稿时长
>12 weeks
期刊介绍: Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.
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