Structurally constrained lithology characterization using magnetic and gravity gradient data over an iron ore formation

Cericia Martinez; Yaoguo Li; Richard Krahenbuhl; Marco Antonio Braga

doi:10.1071/ASEG2012ab211

ISSN: 2202-0586
E-ISSN:

oa Structurally constrained lithology characterization using magnetic and gravity gradient data over an iron ore formation
Authors Cericia Martinez^a, Yaoguo Li^b, Richard Krahenbuhl^c and Marco Antonio Braga^d
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^a Colorado School of Mines, [email protected] ^b Colorado School of Mines, [email protected] ^c Colorado School of Mines, [email protected] ^d Vale, Iron Ore Division, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2012, Issue ASEG2012 - 22nd Geophysical Conference, Dec 2012, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2012ab211
- Published online: 01 Dec 2012

Abstract

Summary

It is often desirable to extract meaningful lithologic information directly from geophysical data. Here, we describe a multi-faceted approach that combines the known geologic sections of a site from borehole data with recovered density and magnetic susceptibility distributions from 3D inversion of airborne gravity gradient and magnetic data. The technique can produce end-member solutions based on average property values extracted from literature and well records; or, it can be implemented using the geologic sections to extract an appropriate range of property values to address the model smoothing common to modern 3D generalized inversions. To demonstrate our approach, we present results utilizing magnetic and gravity gradient data over part of the Gandarela Syncline iron formation in the Quadrilátero Ferrífero, Brazil.

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2012-12-01

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References

Ahrens, T.J., 1995, Rock Physics & Phase Relations, A Handbook of Physical Constants: American Geophysical Union.
Dorr, J. V. N., 1965, Nature and origin of the high-grade hematite ores of Minas Gerais, Brazil: Economic Geology and the Bulletin of the Society of Economic Geologists, 60, no. 1, 1–46.
Dransfield, M.H., M.J. Buckingham, and F.J. van Kann, 1994, Lithological Mapping by Correlation Magnetic and Gravity Gradient Airborne Measurements: Exploration Geophysics, 25, 25-30.
Kanasewich, E.R., and R.G. Agarwal, 1970, Analysis of Combined Gravity and Magnetic Fields in Wave Number Domain: Journal of Geophysical Research, 75, 5702-5712.
Kowalczyk, P., D. Oldenburg, N. Phillips, T.N. Hai Nguyen, and V. Thomson, 2010, Acquisition and Analysis of the 2007- 2009 Geoscience BC airborne data: Australian Society of Exploration Geophysicists – PESA Airborne Gravity Workshop.
Lane, R., and A. Guillen, 2005, Geologically-inspired Constraints for a Potential Field Litho-inversion Scheme: Proceedings of IAMG: GIS and Spatial Analysis, 181-186.
Li, Y., and D.W. Oldenburg, 1996, 3-D inversion of magnetic data: Geophysics, 61, 394-408.
Li, Y., 2001, 3-D inversion of gravity gradiometer data: SEG Technical Program Expanded Abstract, 20, 1470–1473.
Martinez, C., Y. Li, R. Krahenbuhl, M. Braga, 2010, 3D Inversion of airborne gravity gradiometry for iron ore exploration in Brazil: SEG Technical Program Expanded Abstract, 29, 1753-1757.
Williams, N., and G. Dipple, 2007, Mapping Subsurface Alteration Using Gravity and Magnetic Inversion Models: Proceedings of the Fifth Decennial International Conference on Mineral Exploration, 461-472.

/content/journals/10.1071/ASEG2012ab211

Article Type: Research Article

Keyword(s): Gravity gradient data; inversion; lithologic differentiation.; magnetic data

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oa Structurally constrained lithology characterization using magnetic and gravity gradient data over an iron ore formation

Abstract

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