Crustal Structure of the Mendeleev Rise in the Arctic Ocean: Synthesis of Seismic Profiles and Rock Sampling Data

IF 0.3 Q4 GEOLOGY Moscow University Geology Bulletin Pub Date : 2024-06-05 DOI:10.3103/s0145875224700017

A. M. Nikishin, S. G. Skolotnev, G. R. Foulger, E. A. Rodina, K. F. Aleshina, H. W. Posamentier, A. A. Chernykh

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Abstract

The Mendeleev Rise is located in the Amerasian Basin of the Arctic Ocean. The study synthesizes interpretations of regional seismic profiles of the 2D CDP seismic reflection method and rock survey data using special underwater vehicles on the slopes of seamounts and scarps. The rise is represented by alternating highs (horsts) and half-grabens. At the base of the horst sections, bright reflectors are distinguished, interpreted as volcanic rocks. The half-graben sections are wedge-shaped in section view and are similar in geometry to seaward-dipping reflectors (SDR) of continental passive volcanic margins. Rock sampling has shown that the horsts consist of the Paleozoic sedimentary rocks penetrated by intrusions. The Aptian–Albian sections with volcanics (basalts, trachybasalts, trachyandesites) were identified on the horsts. U/Pb dating of igneous rocks has showed that typical age of the rocks is 110–114 Ma. The Cretaceous igneous rocks contain zircons with ages ranging from the Pre-Barremian Mesozoic to Paleozoic and Precambrian. These zircons were captured by basaltic magma during its upward movement. The presence of these ancient zircons indicates that the Mendeleev Rise consists of the continental crust. A model of the crustal structure of the Mendeleev Rise is proposed. The base of the section visible on seismic profiles is characterized by predominance of volcanics (from basalts to trachyandesites on horsts and basically basalts in half-grabens). The upper and lower crust is approximately 20–30% replete with intrusions. At the base of the crust, a high-velocity layer up to 5 km thick is distinguished. It is assumed that its lower part is entirely represented by gabbro-type intrusions, and the upper part is the lowest part of the lower crust, maximally saturated with intrusions.

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北冰洋门捷列夫海隆的地壳结构：地震剖面和岩石取样数据综述

摘要门捷列夫海隆位于北冰洋的阿美拉西亚盆地。该研究综合了二维 CDP 地震反射法区域地震剖面的解释以及在海山和峭壁斜坡上使用特种水下航行器进行的岩石勘测数据。隆起由交替的高点（角）和半堑表示。在角状断面的底部，可以看到明亮的反射体，被解释为火山岩。从剖面图上看，半海湾断面呈楔形，其几何形状类似于大陆被动火山岩边缘的向海倾斜反射体（SDR）。岩石取样显示，地角由被侵入体穿透的古生代沉积岩组成。在地角上发现了带有火山岩（玄武岩、三基性玄武岩、三基性安山岩）的安普顿-阿尔卑斯断面。火成岩的 U/Pb 测定显示，这些岩石的典型年龄为 110-114 Ma。白垩纪火成岩中含有锆石，其年龄从中生代前侏罗纪到古生代和前寒武纪不等。这些锆石是玄武质岩浆在上升过程中捕获的。这些古老锆石的存在表明门捷列夫海隆由大陆地壳组成。提出了门捷列夫海隆的地壳结构模型。从地震剖面图上可以看到，该地段的底部主要是火山岩（从玄武岩到角闪岩，以及半沟谷中的玄武岩）。上部和下部地壳约有 20-30% 为侵入体。在地壳底部，有一个厚达 5 公里的高速层。假定其下部完全是辉长岩型侵入体，上部是下地壳的最低部分，侵入体达到最大饱和。

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来源期刊

Moscow University Geology Bulletin GEOLOGY-

CiteScore

0.60

自引率

25.00%

发文量

期刊介绍： Moscow University Geology Bulletin is the journal that mainly publishes scientific articles, short reports of graduate students, and reviews. Publications made by the members of the Faculty of Geology of the Moscow State University and their collaborators are published. Publications encompass all branches of geology.