Structure and early evolution of the Arabian Sea and East Somali Basin

Details Structure and early evolution of the Arabian Sea and East Somali Basin Structure and early evolution of the Arabian Sea and East Somali Basin

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.134..876m&link_type=abstract

Geophysical Journal International, Volume 134, Issue 3, pp. 876-888.

Astronomy and Astrophysics

Astronomy

13

Arabian Sea, Aseismic Ridge, Continental Margins, Gravity Anomalies, Magnetic Anomalies, Sea-Floor Spreading

Scientific paper

The Laxmi Ridge is a large-scale basement high buried beneath the sediments of the Indus Fan. The location of the ocean-continent transition (OCT) on this margin has previously been proposed at either the southern edge of the Laxmi Ridge or beyond it towards the India-Pakistan shelf. The former explains the margin-parallel Laxmi Basin as thinned continental crust, the latter as a failed rift of earlier seafloor spreading. To examine the structure of this margin, a reassessment of marine magnetic data has detailed seafloor-spreading magnetic anomalies prior to anomaly 24 in both the Arabian and East Somali basins. The previously identified anomaly 28 is not interpreted as a seafloor-spreading anomaly but as a magnetized basement feature adjacent to, and merging with, the ridge-the Laxmi Spur. New gravity models across the Laxmi Ridge and adjacent margin using ship and satellite data corroborate the existence of underplated crust beneath the Laxmi Ridge and Basin and the location of the OCT at the southern edge of the Ridge. The results are not compatible with the existence of a pre-anomaly 28 phase of seafloor spreading, although large-scale intrusions may be the origin of some of the basement features in the Laxmi Basin. The models also identify the Laxmi Spur as a low-density feature with a natural remanent magnetization (NRM) compatible with serpentinization. The Laxmi Ridge is mapped to the southeast, where it appears to terminate at a point coinciding with the appearance of E-W magnetic lineations and gravity anomalies at 15.5°N. Thereafter it becomes indistinct. This is interpreted as necessary in the reconstruction to the Mascarene Plateau to avoid continental overlap.

Affiliated with

Also associated with

No associations

Rating

Structure and early evolution of the Arabian Sea and East Somali Basin 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 Structure and early evolution of the Arabian Sea and East Somali Basin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structure and early evolution of the Arabian Sea and East Somali Basin will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-816549