| Reference Type | Report (issue) |
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| Title | Geology and mineral deposits of the Gallinas Mountains, Lincoln and Torrance Counties, New Mexico |
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| Report | Bulletin |
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| Authors | Perhac, Ralph M. | Author |
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| Year | 1970 |
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| Issue | < 95 > |
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| Publisher | New Mexico Bureau of Geology and Mineral Resources | Place | Socorro, NM |
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| URL | |
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| Download URL | https://geoinfo.nmt.edu/publications/monographs/bulletins/downloads/95/Bulletin095.pdf |
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| DOI | doi:10.58799/b-95Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 17309147 | Long-form Identifier | mindat:1:5:17309147:2 |
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| GUID | 465a2974-a033-4716-bdcc-9a3520fc3e1a |
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| Full Reference | Perhac, Ralph M. (1970) Geology and mineral deposits of the Gallinas Mountains, Lincoln and Torrance Counties, New Mexico. Bulletin 95. New Mexico Bureau of Geology and Mineral Resources doi:10.58799/b-95 |
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| Plain Text | Perhac, Ralph M. (1970) Geology and mineral deposits of the Gallinas Mountains, Lincoln and Torrance Counties, New Mexico. Bulletin 95. New Mexico Bureau of Geology and Mineral Resources doi:10.58799/b-95 |
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| In | Mineral Resources Survey of New Mexico - Bulletin |
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| Abstract/Notes | The Gallinas Mountains comprise Lower Permian sedimentary rocks that were intruded by middle (?) Tertiary hypabyssal intrusives. The sedimentary sequence is typically transgressive, grading upward from Abo arkoses through continental feldspathic sandstones of the Yeso Formation into the beach or shallow-water, marine Glorieta orthoquartzites. A southward fades change into lagoonal and marine beds indicates a northward-advancing sea throughout Early Permian time. By middle Permian, the shoreline had migrated from southern New Mexico northward to the vicinity of the Gallinas Mountains.The Permian beds were uplifted, domed, and faulted by middle (?) Tertiary intrusives, primarily alkalic trachyte and rhyolite laccoliths. Despite extensive igneous activity, contact metamorphism is minor. The presence of these and a number of other similar hypabyssal intrusives in central New Mexico defines a distinct Tertiary subsilicic alkalic intrusive province in this part of the state.Many iron and fluorite-copper-bastnaesite deposits are associated with the trachyte laccolith. The iron occurs as magnetite-hematite re-placement lodes in Yeso carbonate beds. The fluorite-copper-bastnaesite deposits are typical lowtemperature epithermal veins and breccia fillings in Yeso sandstones. Despite the large number of deposits, the economic potential of the Gallinas area is limited. The better iron de-posits have been almost completely exhausted, and, although fluorite, copper minerals, and bastnaesite are common, total reserves of these are small. |
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