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Automated composite depth scale construction and estimates of sediment core extension

机译：自动合成深度尺建设和沉积物芯扩展的估计

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摘要

A composite section, which reconstructs a continuous stratigraphic record from cores of multiple nearby holes, and its associated composite depth scale are important tools for analyzing sediment recovered from a drilling site. However, the standard technique for creating composite depth scales on drilling cruises does not correct for depth distortion within each core. Additionally, the splicing technique used to create composite sections often results in a 10-15% offset between composite depths and measured drill depths. We present a new automated compositing technique that better aligns stratigraphy across holes, corrects depth offsets, and could be performed aboard ship. By analyzing 618 cores from seven Ocean Drilling Program (ODP) sites, we estimate that similar to 80% of the depth offset in traditional composite depth scales results from core extension during drilling and extraction. Average rates of extension are 12.4 +/- 1.5% for calcareous and siliceous cores from ODP Leg 138 and 8.1 +/- 1.1% for calcareous and clay-rich cores from ODP Leg 154. Also, average extension decreases as a function of depth in the sediment column, suggesting that elastic rebound is not the dominant extension mechanism.
机译：复合剖面可从附近多个孔的岩心中重建连续的地层记录，其相关的复合深度尺度是分析从钻探现场回收的沉积物的重要工具。但是，在钻探巡航上创建复合深度标尺的标准技术无法校正每个岩心中的深度变形。此外，用于创建复合截面的拼接技术通常会导致复合深度与测量的钻削深度之间产生10-15％的偏移。我们提出了一种新的自动合成技术，该技术可以更好地对齐地层跨孔，校正深度偏移，并且可以在船上执行。通过分析来自七个海洋钻探计划（ODP）站点的618个岩心，我们估计，传统复合深度标尺中约80％的深度偏移是钻探和提取过程中岩心延伸的结果。 ODP腿138的钙质和硅质岩心的平均延伸率为12.4 +/- 1.5％，ODP腿154的钙质和富含粘土的岩心的平均延伸率为8.1 +/- 1.1％。此外，平均延伸率随着深度的增加而降低。泥沙柱，表明弹性回弹不是主要的伸展机制。

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