A sonic well log of the basement complex of the Walvis Ridge

Author(s): Rabinowitz, Philip D.; Borella, Peter E.
Author Affiliation(s): Primary:
Tex. A&M Univ., Dep. Oceanogr., College Station, TX, United States
Other:
Scripps Inst. Oceanogr., United States
Volume Title: Geo-Marine Letters
Source: Geo-Marine Letters, 3(1), p.1-7. Publisher: A.M. Dowden, Inc., Stroudsburg, PA, International. ISSN: 0276-0460 CODEN: GMLEDI
Note: In English. 18 refs.; illus.
Summary: A sonic well log was obtained within the basement complex of the Walvis Ridge during Deep Sea Drilling Project Leg 74. The top if the basement complex is characterized by smooth acoustic reflectors. The rocks recovered within the basement complex consist of basalts with intercalated sediments. According to the log ≅50% of the upper 75 m of basement are igneous rocks and the other 50% sedimentary. Sonobuoy results indicate that the ratio of sediments to basalt increases with depth for an additional 225 m until a typical oceanic velocity structure is observed. Paleontological results suggest that the processes forming this upper 300 m of the basement complex was accomplished within a short time interval.
Year of Publication: 1984
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 07 Marine Geology and Oceanography; 20 Geophysics, Applied; Acoustical logging; Atlantic Ocean; Deep Sea Drilling Project; Drilling; Gamma-ray methods; Geophysical surveys; IPOD; Leg 74; Radioactivity; Reflection; Sonobuoys; South Atlantic; Surveys; Walvis Ridge; Well-logging
Coordinates: S301000 S280000 E0031000 E0014500
Record ID: 1985002822
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute.