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Aeromagnetic and spectral expressions of rare earth element deposits in Gallinas Mountains area, central New Mexico, USA

Mo Li, Xiaobing Zhou, Christopher H. Gammons, Mohamed Khalil and Marvin Speece
Aeromagnetic and spectral expressions of rare earth element deposits in Gallinas Mountains area, central New Mexico, USA
Interpretation (Tulsa) (November 2018) 6 (4): T937-T949

Abstract

The Gallinas Mountains, located at the junction of Lincoln and Torrance Counties, New Mexico, USA, are a series of alkaline volcanic rocks intruded into Permian sedimentary rocks. The Gallinas Mountains area hosts fluorite and copper as veins containing bastnaesite, whereas deposits of iron skarns and iron replacement are in the area as well. These deposits produce iron. In this study, the multispectral band-ratio method is used for surface mineral recognition, whereas 2D subsurface structure inversion modeling was applied to explore the depth extent of the magnetic ore distribution from aeromagnetic data. Bastnaesite has higher magnetic susceptibility (0.009 SI) than the host rocks and surrounding sedimentary rock. The bastnaesite and iron oxides (magnetite + hematite) can contribute to a positive aeromagnetic anomaly. Results indicate that (1) the positive magnetic anomaly observed at Gallinas Mountains area can be accounted for by a mixture of bastnaesite and iron oxides at a depth of approximately 400 m and a thickness of approximately 13-15 m. The surface of this area is dominated by the hydrothermal alteration associated with iron oxides over the trachyte intrusions as detected by Landsat 8 band-ratio imaging.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 6
Serial Issue: 4
Title: Aeromagnetic and spectral expressions of rare earth element deposits in Gallinas Mountains area, central New Mexico, USA
Affiliation: Montana Technological University, Department of Geophysical Engineering, Butte, MT, United States
Pages: T937-T949
Published: 201811
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 66
Accession Number: 2019-007246
Categories: Applied geophysicsEconomic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch maps
N34°10'60" - N34°13'60", W105°45'20" - W105°43'30"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 201906
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