利用照片和磁感应强度各向异性从二维海槽横断面分析古海流的新方法

IF 1.9 3区 地球科学 Q1 GEOLOGY
Jasper Maars, Gijs van Dijk, Mark J. Dekkers, F. Javier Hernández-Molina, Federico Andreetto, Francisco J. Rodríguez-Tovar, Wout Krijgsman
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引用次数: 0

摘要

古水流分析对于盆地分析至关重要,有助于解释沉积环境(沿坡或下坡)。为此,必须掌握多种测量方法,以便利用各种不同的数据集(露头、岩心和照片)进行古水流分析。在此,我们对两种相对未得到充分利用的古海流测量技术进行了评估,并将其应用于在埃罗拉米诺阿(西西里岛)阿雷纳佐洛地层中观察到的海槽交叉层理。第一种技术是一种新颖的定性方法设计,用于从二维沉积结构的照片中推断古海流方向。第二项技术是通过钻探样本测量磁感应强度的各向异性。两种技术得出的结果基本一致,不确定性边界重叠。这种一致性验证了利用地槽横断面推断古海流方向的有效性。此外,照片的加入提高了可重复性,并避免了对曝光最好的地槽的偏差。这两种技术在露头和沉积岩芯中的应用为在任何类型的沉积环境中进行古海流分析提供了新的机会。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

New palaeocurrent analysis approach from two-dimensional trough cross-strata using photographs and anisotropy of magnetic susceptibility

New palaeocurrent analysis approach from two-dimensional trough cross-strata using photographs and anisotropy of magnetic susceptibility

Palaeocurrent analysis is vital for basin analysis and helps in the interpretation of depositional environments (along-slope or downslope). For that, it is crucial to have multiple measuring methods at hand to apply palaeocurrent analysis with a wide range of different datasets (outcrops, cores and photographs). Here, two relatively underexploited palaeocurrent measurement techniques are assessed when applied to trough cross-stratification observed in the Arenazzolo Formation at Eraclea Minoa (Sicily). The first technique is a novel design of a qualitative approach to infer palaeocurrent directions from photographs of two-dimensional sedimentary structures. The second technique involves measurements of the anisotropy of magnetic susceptibility from drilled samples. A broad agreement, with overlapping uncertainty boundaries, is observed between results from both techniques. This agreement validates the use of trough cross-strata to infer palaeocurrent directions. Moreover, the addition of photographs improves reproducibility and prevents a bias towards the best-exposed troughs. The application of both techniques to outcrops and sedimentary cores provides new opportunities for palaeocurrent analysis in any type of sedimentary environment.

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来源期刊
CiteScore
4.10
自引率
16.70%
发文量
42
审稿时长
16 weeks
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