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首頁> 外文期刊>Marine Geology >High resolution digital image treatment to color analysis on cores from IODP Expedition 339: Approaching lithologic features and bioturbational influence
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High resolution digital image treatment to color analysis on cores from IODP Expedition 339: Approaching lithologic features and bioturbational influence

機譯：IODP Expedition 339進行高分辨率數(shù)字圖像處理以對巖心進行顏色分析：接近巖性特征和生物湍流影響

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Color analysis was conducted on selected cores from Sites U1385 and U1389 from IODP Expedition 339 based on a recently developed high resolution digital image treatment to explore its relationship with lithologic features (e.g., percentage of sand). This first step can be of potential usefulness in characterizing/discriminating between different types of registered sediments in the IODP Expedition 339 - turbidites, contourites and associated sediments and then for more general studies involving different lithologies, sedimentary parameters and ichnological variations. Differentiation between types of deposits holds particular interest in the context of the Mediterranean Outflow Water (MOW) evolution and related depositional processes, whose study was one of the main aims of IODP Expedition 339. Color characterization was executed on high resolution digital images by applying a method based on adjustment modification - including levels, brightness and vibrance followed by pixel measurement. The applied methodology allows for a precise characterization of colors, improving upon previous color descriptions by means of Munsell Color conducted on-board, during Expedition 339 itself. The studied interval is subdivided into four parts based on grain size analysis and color. According to pixel values these parts are identified as: A (120), B (90), C (140), and D (160), being well correlated with the corresponding lithology. Parts A and C, with similar pixel values, correspond to calcareous silty mud/mudstone, part B would correlate with calcareous silty sand/sandstones, and part D corresponds to calcareous mud. Sand content distribution throughout the studied interval bears a close relationship with the differentiated parts A to D. Intervals having a higher percentage of sand present a lower mean pixel value and darker color, whereas the finer grained intervals contain sediments lighter in color, represented by higher pixel values. However, as proved, the proposed relationship between color/sedimentological features/type of sediment must be considered with some caution. Ichnological analysis reveals the influence of trace fossils on color variations in the sediment, regardless of the size of traces and amount of bioturbation, the infilling material of trace fossils being the most determinant factor. Thus, lower bioturbated surfaces (6%) by small trace fossils (Chondrites) show higher influence on color variations (102 vs 107) than higher bioturbated surfaces (25%) by large trace fossils (Thalassinoides) (110 vs 112), due to the color of the infilling material, 56 in the case of Chondrites and 90 in the case of Thalassinoides. Thus, a detailed ichnological analysis should accompany the sedimentological study of deep-sea modern cores in order to avoid misinterpretations of the sedimentological parameters involved. (C) 2016 Elsevier B.V. All rights reserved.
機譯：根據(jù)最近開發(fā)的高分辨率數(shù)字圖像處理技術，對IODP Expedition 339站點U1385??和U1389的選定巖心進行了顏色分析，以探索其與巖性特征（例如，沙子百分比）的關系。第一步可能對表征/區(qū)分IODP Expedition 339中不同類型的已注冊沉積物-濁石，輪廓石和相關沉積物具有潛在的實用價值，然后對于涉及不同巖性，沉積參數(shù)和巖石學變化的更廣泛的研究。在地中海流出水（MOW）演化和相關沉積過程的背景下，沉積物類型之間的區(qū)別尤其引起關注，該研究的研究是IODP Expedition 339的主要目標之一?；谡{整修改的方法-包括級別，亮度和振動度，然后進行像素測量。應用的方法可以對顏色進行精確的表征，并在Expedition 339本身期間借助機載的Munsell Color對先前的顏色描述進行了改進。根據(jù)粒度分析和顏色，將研究區(qū)間分為四個部分。根據(jù)像素值，這些部分被標識為：A（120），B（90），C（140）和D（160），與相應的巖性良好相關。具有相似像素值的A部分和C部分對應于鈣質粉質泥漿/泥巖，B部分與鈣質粉質砂土/砂巖相關，D部分對應于鈣質泥漿。整個研究區(qū)間的含沙量分布與A到D的差異部分密切相關。含沙量較高的區(qū)間表示較低的平均像素值和較深的顏色，而細粒度的區(qū)間包含較淺的沉積物，表示為較高像素值。然而，事實證明，在顏色/沉積特征/沉積物類型之間的建議關系必須謹慎考慮。技術學分析表明，無論痕跡的大小和生物擾動的量如何，痕跡化石對沉積物顏色變化的影響都是決定性因素。因此，由于小痕跡化石（Chondrites）的較低的生物擾動表面（6％）對顏色變化的影響（102 vs 107）比大痕跡化石（Thalassinoides）的較高生物擾動的表面（25％）（110 vs 112）具有更高的影響。填充材料的顏色，球粒石的顏色為56，Thalassinoides的顏色為90。因此，應對深海現(xiàn)代巖心進行沉積學研究，并進行詳細的水墨學分析，以避免對所涉及的沉積學參數(shù)產(chǎn)生誤解。 （C）2016 Elsevier B.V.保留所有權利。

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