Proc. IODP, 341, Data report: permeability, grain size, biogenic silica, and clay minerals of Expedition 341 sediments from Sites U1417 and U1418

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Chapter contents Abstract Introduction Methods Permeability tests Grain size analyses Silica analyses Clay mineral analyses Results Acknowledgments References Figures F1. Site locations. F2. Permeability test system. F3. X-ray diffraction analysis. F4. Shipboard porosity and permeability results, Site U1417. F5. Shipboard porosity and permeability results, Site U1418. Tables T1. Mineral mixtures for calibration of normalization factors. T2. Results from laboratory permeability tests and grain size analyses. T3. Results from amorphous silica analyses. T4. X-ray diffraction results for bulk mineral standard mixtures. T5. Normalization factors for X-ray diffraction of bulk mineral standard mixtures. T6. Bulk sediment X-ray diffraction results. T7. Clay-size fraction X-ray diffraction results. PDF file			Previous \| Next doi:10.2204/iodp.proc.341.202.2017 Introduction Operations during Integrated Ocean Drilling Program Expedition 341 recovered cores from off the coast of the Gulf of Alaska (Fig. F1; see the “Expedition 341 summary” chapter [Jaeger et al., 2014]). In this study, we used flow-through permeability tests to measure the permeability of five whole-round core samples from Site U1417 and six whole-round core samples from Site U1418. Subsamples from the core used for permeability testing were divided for grain size, biogenic silica, and clay mineral analyses. The uppermost sample at Site U1417 consists of distal Surveyor Fan sediments, and the other four samples from this site consist of pre-Surveyor Fan sediments. The samples from Site U1418 represent proximal Surveyor Fan sediments. The objective of the testing was to help characterize the sediments that are being carried toward the Aleutian Trench on the incoming Pacific plate (Fig. F1). The permeability of sediments entering subduction zones can greatly affect fluid pressures during shallow subduction, and this work provides some of the first permeability results from the incoming plate in this region. Analysis of amorphous silica and clay mineral content provides information on hydrous sedimentary minerals that can dehydrate during subduction or accretion and increase fluid pressures (Screaton, 2010). Top of page \| Previous \| Next

Introduction