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On application of fractal magnetization in Curie depth estimation from magnetic anomalies

Li Chun Feng, Zhou Duo, Wang Jian

Acta Geophysica

2019

Vol. 67, no. 5

1319--1327

As an independent geothermal proxy, the Curie-point depth has important geodynamic implications, but its estimation from magnetic anomalies requires an understanding of the spatial correlation of source magnetization, mathematically characterized by a fractal exponent. In this paper, we show that fractal exponent and Curie depth are so strongly inter-connected that attempts to simultaneous or iterative estimation of both of them often turn out to be futile. In cases of true large Curie depths, the iterative “de-fractal” method has a tendency of overcorrecting fractal exponents and thereby producing erroneously small Curie depths and smearing out true geological trends. While true fractal exponent can no way be constant over a large area, a regionally fxed fractal exponent is better than any mathematical treatments that are beyond the limit of data resolution and the underlying physics.

A note on the lithosphere thickness and heat flow density of the Indian Craton from MAGSAT data

Sarkar R., Saha D., Saha D.

Acta Geophysica

2006

Vol. 54, no. 2

198-204

The Curie depth map of India compiled from MAGSAT data has been used for preparing the lithosphere thickness and the surface heat flow density maps of the Indian Craton, utilizing the concept of magnetothermometry. The lithosphere thicknesses of the major Indian geological units/provinces, as obtained from the prepared map, are found to be in reasonably good agreement with the previously published values for these regions. Also, the surface heat flow density values ob-tained from the prepared maps closely follow the previously published results. The maps are useful in providing first order estimates of lithosphere thickness and sur-face heat flow density of the important geological units/provinces of India.