Alteration of magnetic minerals and its effect on the NRM of Deccan trap flows of the Narmada region, India

Subbarao, Kakarla; Prasad, C. V. R. K.; Radhakrishnamurty, C.

doi:10.1016/0012-821x(89)90073-3

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…This suggests that there has been low temperature oxidation in the sample as experiments on young lavas have shown that alteration of low Curie temperature phases during heating is not severe when the rock is fresh. SUBBARAO et al (1989) suggest that the MD magnetite-bearing Deccan lavas have all undergone hydrothermal alteration, and to support this they show a correlation between water content and those samples with MD magnetite. With collections of younger rocks, the majority of samples have shown group one low temperature behaviour, indicating the presence of Ti-rich titanomagnetite or SD magnetite (e.g.…”

Section: ) Diskomentioning

confidence: 66%

“…However, it would seem likely that many of the Disko and Deccan lavas have been hydrothermally altered. Although SUBBARAO et al (1989) report increased scatter in NRM directions on some of the hydrothermally altered Narmada lavas, hydrothermal alteration can change the NRM intensity without affecting its direction (PREVOT and GROMME, 1975). Unfortunately it is not known which of the lavas remain sufficiently unaltered to give reliable palaeointensity values.…”

Section: ) Diskomentioning

confidence: 99%

“…Note: Locality and sites as described in ATHAVALE and SHARMA (1975 although, according to SUBBARAO et al (1989) the southern side is more altered. The palaeointensities obtained from the Deccan are considerably lower than those obtained by KoNo (1974) using the Thellier technique.…”

Section: ) Diskomentioning

confidence: 99%

See 2 more Smart Citations

The Strength of the Geomagnetic Field at the Cretaceous-Tertiary Boundary: Palaeointensity Results from the Deccan Traps(India)and the Disko Lavas(Greenland).

Shaw¹,

Sherwood²,

Mussett³

et al. 1991

J. geomagn. geoelec

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Section: ) Diskomentioning

confidence: 66%

Section: ) Diskomentioning

confidence: 99%

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The Strength of the Geomagnetic Field at the Cretaceous-Tertiary Boundary: Palaeointensity Results from the Deccan Traps(India)and the Disko Lavas(Greenland).

Shaw¹,

Sherwood²,

Mussett³

et al. 1991

J. geomagn. geoelec

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Palaeomagnetism and rock magnetism of the Deccan traps

Radhakrishnamurty

Subbarao

1990

Proc. Indian Acad. Sci. (Earth Planet Sci.)

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Anisotropy of Magnetic Susceptibility and Rock Magnetic Applications in the Deccan Volcanic Province based on some Case Studies

Sangode

Sharma

Mahajan

et al. 2017

Journal of the Geological Society of India

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Anisotropy of Magnetic Susceptibility (AMS) as a tool has been explored here to investigate the nature of petrofabrics in Deccan Volcanic Province (DVP) of west-central Indian region by representative sampling in typical pahoehoe and rubbly pahoehoe lava flows, dykes within flows, shear zone and the impact crater units. The rock magnetic analysis indicate varying degree of concentration of titanomagnetite compositions dominated by multi domain (MD) to pseudo single domain (PSD) grains favoring shape anisotropy of minerals that form primary fabrics. The pahoehoe type lava flows shows planar oblate fabrics without any preferred orientation of principle susceptibility axis (K1) depicting crystal settling (of magnetic grains) as chief mechanism of fabric development. The rubbly pahoehoe type lava flow exhibit prolate fabrics with well clustered maximum susceptibility axis within horizontal to sub-horizontal planes depicting their response to viscosity shear. The dykes show well clustered K1 parallel to it’s plane locked during rapid contractional cooling. The sampling at Lonar impact crater was unable to trace any clear fabric due to impact/shock induced deformation and rather preserve the primary fabrics. Further, the shear zone depict random fabrics demanding more detailed and systematic sampling in both the cases. The present investigation infer that the magnetic mineralogy and magnetic fabric variations in the DVP are controlled by the flow mechanism and style of cooling that is characteristic of the given flow unit or dyke and any secondary or superimposed fabric needs to be examined by critical sampling strategy. While more detailed attempts are required to establish the AMS as a tool to record various aspects including the flow dynamics and rate of effusion in the vast terrain of DVP; the present approach is useful to characterize and correlate the lava flow units and dyke occurrences.

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Alteration of magnetic minerals and its effect on the NRM of Deccan trap flows of the Narmada region, India

Cited by 6 publications

References 6 publications

The Strength of the Geomagnetic Field at the Cretaceous-Tertiary Boundary: Palaeointensity Results from the Deccan Traps(India)and the Disko Lavas(Greenland).

The Strength of the Geomagnetic Field at the Cretaceous-Tertiary Boundary: Palaeointensity Results from the Deccan Traps(India)and the Disko Lavas(Greenland).

Palaeomagnetism and rock magnetism of the Deccan traps

Anisotropy of Magnetic Susceptibility and Rock Magnetic Applications in the Deccan Volcanic Province based on some Case Studies

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