北极中部海底高地的沉积作用:古地磁和地震声学数据的综合分析结果

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geotectonics Pub Date : 2024-03-10 DOI:10.1134/s0016852123070063
D. V. Elkina, A. L. Piskarev, D. V. Bezumov
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引用次数: 0

摘要

摘要 北极盆地沉积物中的微型动物数量不足,使年代划分变得复杂。在这种情况下,古地磁法是确定年龄界限的主要方法。20 世纪 70 年代,利用这种方法构建了第一个成功的北极沉积物年龄模型。近几十年来,一些工作使人们有可能将天然剩磁方向的变化描述为次生地球化学过程的结果,这实际上否定了将古地磁学应用于北极盆地沉积物的可能性。根据我们对北极中部海底高地沉积岩芯中天然剩磁的研究,可靠地确定了参考古地磁层。根据计算,阿尔法海脊和门捷列夫海脊的沉积速率较低(<2 mm/kyr)。由于跨极地漂移的影响,向罗蒙诺索夫海脊和陆棚方向的平均沉积速率有所增加。根据对古地磁和地震声学数据的综合分析,门捷列夫海脊和波德沃德尼科夫海盆自早中新世以来就具有低沉积速率的特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Sedimentation in the Central Arctic Submarine Elevations: Results of Comprehensive Analysis of Paleomagnetic and Seismoacoustic Data

Abstract

The age assignment to the Arctic Basin sediments is complicated by the insufficient microfauna in them. Under these conditions, the paleomagnetic method is the major method to determine age boundaries. This method was used to construct the first successful age model of Arctic sediments in the 1970s. In recent decades, a number of works made it possible to describe changes in natural remanent magnetization direction as a consequence of secondary geochemical processes, in fact, discrediting the possibility of applying paleomagnetism to the Arctic Basin sediments. Based on our research of natural remanent magnetization in sediment cores from the Central Arctic submarine elevations, the reference paleomagnetic horizons were determined reliably. The sedimentation rates at the Alpha and Mendeleev ridges was calculated to be low (<2 mm/kyr). Mean sedimentation rates increase toward the Lomonosov Ridge due to the influence of the Transpolar Drift and toward the shelf. Based on the comprehensive analysis of the paleomagnetic and seismoacoustic data, low sedimentation rates have been characteristic of the Mendeleev Ridge and Podvodnikov Basin since the Early Miocene.

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来源期刊
Geotectonics
Geotectonics 地学-地球化学与地球物理
CiteScore
1.90
自引率
9.10%
发文量
28
审稿时长
3 months
期刊介绍: Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.
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