Magnetometry as a Tool to Estimate the Pollution of Marine Environment Around Small Shipwrecks (Gulf of Gdańsk) — Preliminary Results

IF 2 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Acta Geophysica Pub Date : 2016-10-01 DOI:10.1515/acgeo-2016-0056

Magdalena Gwizdała, M. Jeleńska, Leszek Łęczyński

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引用次数: 2

Abstract

Magnetic properties of deposits around the shipwrecks (“Munin” and “Abille”) in the Gulf of Gdańsk were investigated. Values of magnetic susceptibility (χ) are relatively low; however, they reveal significant differences between investigated sites. The values of χ around “Abille” wreck were 5-8×10-8 m3/kg. Around “Munin” wreck results were more diversified reaching value of χ between 3.07×10-8m3/kg and 12.92×10-8 m3/kg. The spatial variability of χ coincided with near-bottom water currents distribution in the Gulf of Gdańsk. Magnetic minerals were identified by thermomagnetic analysis. Around “Abille” wreck we have found magnetite with small amount of maghemite or hematite. The “Munin” sediments include only one magnetic phase; in several samples it is magnetite, in the others — maghemite. Day—Dunlop plot shows that “Abille” set is shifted towards lower magnetization ratio and higher coercivity ratio. The correlation between the distribution of χ and hydrodynamic condition around shipwrecks allows to determine the direction of contaminant transport.

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用磁力计估算小型沉船(Gdańsk湾)周围海洋环境污染的初步结果

研究了Gdańsk海湾沉船(“Munin”和“Abille”)周围沉积物的磁性。磁化率(χ)值较低;然而，它们揭示了被调查地点之间的显著差异。“阿比勒”号沉船周围的χ值为5-8×10-8 m3/kg。“穆宁”号前后沉船结果的χ值在3.07×10-8m3/kg ~ 12.92×10-8 m3/kg之间的达到值更为多样化。χ的空间变异性与Gdańsk湾近底水流分布一致。利用热磁分析对磁性矿物进行了鉴定。在“阿比勒”号残骸周围，我们发现了磁铁矿和少量的磁铁矿或赤铁矿。“Munin”沉积物只包含一个磁相;在一些样品中是磁铁矿，在其他样品中是磁铁矿。Day-Dunlop图显示，“Abille”集向低磁化比和高矫顽力比方向偏移。χ分布与沉船周围水动力条件之间的相关性可以确定污染物的运输方向。

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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来源期刊

Acta Geophysica 地学-地球化学与地球物理

CiteScore

3.90

自引率

13.00%

发文量

251

审稿时长

5.3 months

期刊介绍： Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.