English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Eleven whole-round core samples from Integrated Ocean Drilling Program Expedition 341 Sites U1417 and U1418 were tested for vertical permeability. Subsamples of each core were taken and analyzed for grain size, biogenic silica content, and clay mineralogy. Measured vertical permeability varied from 1.8 × 10–18 to 1.5 × 10– 16 m2. With the exception of one sample from Site U1417, samples were dominated by clay-size (<4 μm) fractions with lesser silt-size (4–63 μm) and sand-size (>63 μm) fractions. Biogenic silica (SiO2) content ranged from 2 to 15 wt% at Site U1417 and was consistently ~2 wt% in samples from Site U1418. Clay mineral abundance exceeded that of quartz, feldspar, and calcite in all samples. Smectite content ranged from 3 to 38 wt% in Site U1417 samples and from 0 to 3 wt% in Site U1418 samples. 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). Data report: permeability, grain size, biogenic silica, and clay minerals of Expedition 341 sediments from Sites U1417 and U1418 Elizabeth J. Screaton,2 Tania Villaseñor,2 Stephanie R. James,2 Lanie N. Meridth,2 John M. Jaeger,2 and William F. Kenney3