Using High-Resolution Aeromagnetic Surveys to Map Subsurface Hydrogeology in Sediment-Filled Basins: A Case Study over the Rio Grande Rift, Central New Mexico, USA

V. J. S. Grauch

doi:10.1071/EG01209

ISSN: 0812-3985
E-ISSN: 1834-7533

Using High-Resolution Aeromagnetic Surveys to Map Subsurface Hydrogeology in Sediment-Filled Basins: A Case Study over the Rio Grande Rift, Central New Mexico, USA
Authors V. J. S. Grauch^a
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^a U. S. Geological Survey Denver, , Colorado, , USA, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 32, Issue 3-4, Sep 2001, p. 209 - 213
DOI: https://doi.org/10.1071/EG01209
- Published online: 01 Sep 2001

Abstract

High-resolution aeromagnetic surveys were acquired for the Albuquerque basin in the central Rio Grande rift, a basin filled with poorly consolidated sediments. The surveys proved successful in efficiently and economically mapping previously unknown hydrogeologic features of the shallow subsurface. This success suggests that aeromagnetic methods may be useful in hydrogeologic studies of other sediment-filled basins.

The aeromagnetic surveys were used primarily to delineate buried igneous rocks and to locate faults within the basin fill, both important for understanding the subsurface hydrogeology. Buried igneous rocks were recognized from their high-frequency, high-amplitude magnetic responses and characteristic map patterns. The horizontal-gradient and local wavenumber methods were used to obtain estimates of their source depths.

The aeromagnetic surveys were also successfully used to locate faults within the basin fill. Magnetic signatures associated with faults are produced by the juxtaposition of sediments having differing magnetic properties rather than the products of secondary processes. Expression of faults is abundant throughout the basin, revealing patterns that cannot be mapped at the surface due to widespread cover.

A fault signature recognized in the high-resolution data that has multiple inflection points is best explained by a fault with a thin magnetic layer on the upthrown block and thick magnetic layer on the downthrown block, called the thin-thick layers model. Geologically, this signature indicates erosion of the upthrown block or a growth-faulting scenario: fault-controlled sedimentation for faults that offset sediments, and successive accumulation of basalt on the downthrown block for faults that offset volcanic rocks.

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References

Grauch, V.J.S., 1999, Principal features of high-resolution aeromagnetic data collected near Albuquerque, New Mexico in Pazzaglia, F.J., and Lucas, S.G., eds., Albuquerque geology: New Mexico Geological Society Guidebook, 50, 115 - 118, 2 plates.
Grauch, V.J.S., 2001, High-resolution aeromagnetic data, a new tool for mapping intrabasinal faults: An example from the Albuquerque basin, New Mexico: Geology, 29, 367-370.
Grauch, V.J.S., Hudson, M.R., and Minor, S.A., 2000, Aeromagnetic signatures of intrabasinal faults, Albuquerque basin, New Mexico: Implications for layer thickness and magnetization: 70th Meeting, SEG, Calgary, Expanded Abstracts, 363-366.
Grauch, V.J.S., Hudson, M.R., and Minor, S.A., 2001, Aeromagnetic expression of faults that offset basin fill, Albuquerque basin, New Mexico: Geophysics, 66, 707-720.
Hudson, M.R., Mikolas, M., Geissman, J.W., and Allen, B.D, 1999b, Paleomagnetic and rock magnetic properties of Santa Fe Group sediments in the 98th Street core hole and correlative surface exposures, Albuquerque basin, New Mexico, in Pazzaglia, F.J., and Lucas, S.G., eds., Albuquerque geology: New Mexico Geological Society Guidebook, 50, 355-361.
Hudson, M.R., Minor, S.A., and Grauch, V.J.S., 2001, Fault framework for the Albuquerque basin, Rio Grande rift: 2001 GSA meeting, Geological Society of America Abstracts with Programs, 33, no. 5, A47-A48.
Hudson, M.R., Minor, S.A., Grauch, V.J.S., and Personius, S.F., 1999a, Preliminary characterization of faults in the Middle Rio Grande basin: U.S. Geological Survey Open-File Report 99-203, 40-41.
Maldonado, F., Connell, S.D., Love, D.W., Grauch, V.J.S., Slate, J.L., McIntosh, W.C., Jackson, P.B., and Byers, F.M., Jr., 1999, Neogene geology of the Isleta Reservation and vicinity, Albuquerque basin, New Mexico, in Pazzaglia, F.J., and Lucas, S.G., eds., Albuquerque geology: New Mexico Geological Society Guidebook, 50, p. 175-188.
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Article Type: Research Article

Keyword(s): aeromagnetic survey; faults; hydrogeology; igneous rocks; sedimentary basin

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Using High-Resolution Aeromagnetic Surveys to Map Subsurface Hydrogeology in Sediment-Filled Basins: A Case Study over the Rio Grande Rift, Central New Mexico, USA

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