Physical signature of basaltic volcanics drilled on the Northeast Atlantic volcanic rifted margins

Author(s): Bücker, C. J.; Delius, H.; Wohlenberg, J.
Ocean Drilling Program, Leg 163, Shipboard Scientific Party
Author Affiliation(s): Primary:
Joint Geoscientific Research of the State Geological Surveys, Hanover, Federal Republic of Germany
Rheinisch-Westfälische Technische Hochschule, Federal Republic of Germany
Volume Title: Core-log integration
Volume Author(s): Harvey, P. K., editor; Lovell, M. A.
Source: Geological Society Special Publications, Vol.136, p.363-374; Core-log integration, London, United Kingdom, Sept. 1996, edited by P. K. Harvey and M. A. Lovell. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719. ISBN: 1-86239-0169
Note: In English. 37 refs.; illus., incl. charts, geol. sketch maps
Summary: During several DSDP and ODP Legs in the NE Atlantic, basaltic lava flows of the early rifting and break-up phase in the Tertiary have been drilled and logged. The lava flows were deposited subaerially with characteristic variations in their physical and magnetic properties and it is possible to distinguish different intraflow zones (I-IV) by evaluating downhole and core measurements. The physical and magnetic properties are mainly influenced by the degree of vesicularity and alteration, especially in the top and bottom parts of the flows. The pattern of the magnetic properties susceptibility and remanence seems to be helpful in distinguishing different flow types (aa and pahoehoe) as well as intraflow structures. These zonal characterizations of subaerial basaltic lava flows can be seen frequently in core as well as in downhole measurements. This holds true not only for one hole but also for holes at different locations in the NE Atlantic with an exceptional high correlation down to fine scale variations, pointing to comparable genetic mechanisms during the initial phase of rifting.
Year of Publication: 1998
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 18 Geophysics, Solid-Earth; Basalts; Cenozoic; Continental margin; Crust; Deep Sea Drilling Project; Deep drilling; Deep-seated structures; Drilling; East Pacific; IPOD; Igneous rocks; Leg 81; Lithostratigraphy; Lower Tertiary; Magnetic properties; North Pacific; Northeast Pacific; Oceanic crust; Pacific Ocean; Physical properties; Plate tectonics; Rift zones; Rifting; Tertiary; Volcanic rocks
Coordinates: N520000 N760000 W0360000 W0680000
Record ID: 1999021036
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