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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The layered structure of the oceanic crust is characterized by changes in geophysical gradients rather than by discrete layer boundaries. Correlation of geophysical logs and cores recovered from DSDP Hole 504B provides some insight into the physical properties that control these gradient changes. Borehole televiewer logging in Hole 504B provides the deepest continuous image of well-bore reflectivity into the oceanic crust, revealing detailed structures not apparent otherwise, because of the low percentage of core recovery. Physical characteristics of the crustal Layers 2A, 2B, and 2C, such as the detailed sonic velocity and lithostratigraphic structure, are obtained through analysis of the sonic, borehole televiewer, and electrical resistivity logs. A prediction of bulk hydrated mineral content, consistent with comparison to the recovered material, suggests a change in the nature of the alteration with depth. Data from the sonic, borehole televiewer, electrical resistivity, and other porosity-sensitive logs are used to calculate the variation of porosity in the crustal Layers 2A, 2B, and 2C. Several of the well logs that are sensitive to the presence of fractures and open porosity in the formation indicate many zones of intense fracturing. Interpretation of these observations indicates that there may be a fundamental pattern of cooling-induced structure in the oceanic crust.

Sonic and Ultrasonic Logging of Hole 504B and Its Implications for the Structure, Porosity, and Stress Regime of the Upper 1 km of the Oceanic Crust