The nature and shape of the sources of marine magnetic anomalies

Details The nature and shape of the sources of marine magnetic anomalies The nature and shape of the sources of marine magnetic anomalies

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..33..310k&link_type=abstract

Earth and Planetary Science Letters, Volume 33, Issue 3, p. 310-320.

Computer Science

11

Scientific paper

Most dykes appear to be intruded in a zone less than 50 m wide at spreading ridges, while the lavas they feed flow out 1 km or so to either side (Kidd, 1976, 1977). The resulting oceanic crust consists of a lava layer with few dykes which grades down through a rapid transition of increasing dykes into a sheeted dyke layer which in turn grades down into gabbro. The shape of the source blocks of oceanic magnetic anomalies can be determined from this structure. The boundary between two adjacent blocks is effectively sharp and dips: toward the spreading axis at a shallow to moderate angle in the lavas, then steeply away in the sheeted dykes and finally gently away from the spreading axis in the gabbro. There is no significant mixing of oppositely magnetised rocks across such a reversal boundary. In older oceanic crust (more than a few million years) the lavas are probably only a few times more highly magnetised than the sheeted dykes and gabbro. Consequently the latter may make a significant contribution to observed magnetic anomalies, particularly when the width of the source blocks is large. Source blocks of this shape may explain several enigmatic features of magnetic anomalies and provide better matches of computed with observed anomalies than thin, vertical sided blocks.

Affiliated with

Also associated with

No associations

Rating

The nature and shape of the sources of marine magnetic anomalies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The nature and shape of the sources of marine magnetic anomalies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The nature and shape of the sources of marine magnetic anomalies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-952057