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Magnetic rock properties of the gabbros from the ODP Drill Hole 1105A of the Atlantis Bank, southwest Indian Ridge

DRS at CSIR-National Institute of Oceanography

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Title Magnetic rock properties of the gabbros from the ODP Drill Hole 1105A of the Atlantis Bank, southwest Indian Ridge
 
Creator Rao, D.G.
Krishna, K.S.
 
Description Laboratory studies of 30 samples from 158m long drill core of the Hole 1105A (ODP Leg 179) of the Atlantis Bank, Southwest Indian Ridge have revealed magnetic properties of the gabbros, olivine gabbros, oxide gabbros and olivine oxide gabbros down the core. Comparison of modal proportions of the oxides, grain sizes and magnetization parameters of the rocks has confirmed that
most coarse-grained oxide mineral bearing rocks record low Koenigsberger ratio (2 to 5) and median destructive fields (5 to 7 mT). Average natural remanent magnetization (Jnrm) and stable remanent magnetization (Jst) of the core samples are 5.8A/m and 1.9 A/m, respectively. Their mean stable magnetic inclination is 66˚±4˚, about 14˚ steeper than the expected dipole inclination of the area
similar to the one reported at Hole 735 B. The excess inclination perhaps marks a tectonic block rotation of the reversely magnetized rocks of the bank. We interpret that gabbros and serpentinites devoid of basaltic carapace significantly contribute to seafloor spreading anomalies of the bank.
 
Date 2006-03-31T11:38:47Z
2006-03-31T11:38:47Z
2002
 
Type Journal Article
 
Identifier Proc. Indian Acad. Sci. (Earth Planet. Sci.), vol. 111(4), 467-481
http://drs.nio.org/drs/handle/2264/36
 
Language en
 
Format 233472 bytes
application/pdf
 
Publisher Indian Academy of Sciences