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Volume 30 Issue 2
Apr 2019
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Article Contents
Shereef A. Bankole, Jim Buckman, Dorrik Stow, Helen Lever. Automated Image Analysis of Mud and Mudrock Microstructure and Characteristics of Hemipelagic Sediments:IODP Expedition 339. Journal of Earth Science, 2019, 30(2): 407-421. doi: 10.1007/s12583-019-1210-4
Citation: Shereef A. Bankole, Jim Buckman, Dorrik Stow, Helen Lever. Automated Image Analysis of Mud and Mudrock Microstructure and Characteristics of Hemipelagic Sediments:IODP Expedition 339. Journal of Earth Science, 2019, 30(2): 407-421. doi: 10.1007/s12583-019-1210-4

Automated Image Analysis of Mud and Mudrock Microstructure and Characteristics of Hemipelagic Sediments:IODP Expedition 339

doi: 10.1007/s12583-019-1210-4
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  • Corresponding author: Shereef A. Bankole
  • Received Date: 23 Feb 2017
  • Accepted Date: 11 Jul 2017
  • Publish Date: 01 Apr 2019
  • The microstructural analysis of muds and mudrocks requires very high-resolution measurement. Recent advances in electron microscopy have contributed significantly to the improved characterisation of mudrock microstructures and their consequent petrophysical properties. However, imaging through electron microscopy is limited to small areas of coverage such that upscaling of these properties is a great challenge. In this paper, we develop a new methodology for multiple large-area imaging using scanning electron microscopy through automated acquisition and stitching from polished thin-sections and ion-milled samples. The process is fast, efficient and minimises user-input and bias. It can provide reliable, quantifiable data on sediment grain size, grain orientation, pore size and porosity. Limitations include the time involved for individual runs and manual segmentation, the large amount of computer memory required, and instrument resolution at the nano-scale. This method is applied to selected samples of Quaternary muddy sediments from the Iberian margin at IODP Site 1385. The section comprises finegrained (very fine clayey silts), mixed-composition, biogenic-terrigenous hemipelagites, with a pronounced but non-regular colour cyclicity. There is a multi-tiered and diverse trace fossil assemblage of the deep-water Zoophycos ichnofacies. The sediment microstructures show small-scale heterogeneity in all properties, and an overall random fabric with secondary preferred grain-alignment. These results on the fabric differ, in part, from previous studies of hemipelagic muds. Further work is underway on their comparison with other deep-water sediment facies.


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