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Middle Peak (Tres Hermanas Mountains)

Tres Hermanas Mountains (Part 2): Middle Peak The Tres Hermanas Mountains is a small mountain range 4 miles northwest of Columbus, New Mexico. The most recognizable features of this range are three prominent peaks that are nearly perfectly aligned along the northeast portion of the Tres Hermanas Mountains. The three peaks, in order of descending elevation, are North Peak, Middle Peak, and South Peak. North Peak is the range’s highest point. There is a 4th prominent peak less than a mile west of North and Middle Peak that is informally designated “Chloride” or “Chloride Peak” by some. This peak was named after the NGS Survey Marker that was once on its summit that was monumented in 1917. The largest feature in the Tres Hermanas Mountains is a stock (an intrusive igneous body less than 100 km2) comprised of a quartz monzonite – granite. This stock makes up North Peak, Middle Peak, South Peak, and “Chloride Peak”. Thus, virtually all North Peak is merely a small portion of the stock and made up of a pinkish gray, yellowish orange, to yellowish gray quartz monzonite – granite. The quartz monzonite – granite is mainly comprised of medium – coarse grained quartz, plagioclase, and potassium feldspar. K/Ar radiometric dating yielded ages of just over 50 million years. The stock intrudes Paleozoic sedimentary rocks and may also intrude the late Mesozoic sedimentary rock and early Cenozoic igneous rock that layer the area (Balk, 1961; Leonard, 1961). Contact metamorphism, the result of heat and pressure from the intruding stock physically and chemically changing the cooler host sedimentary rock before the stock cooled, is found all along the contacts where the quartz monzonite – granite meet the older carbonate sediments. These metamorphosed carbonates are comprised of coarse-grained marble with some garnet. Younger volcanics layer the surrounding portions of the range, some of which were extruded locally (Leonard, 1982). During the 19th – 20th century, the Tres Hermanas Mountains was one of countless mountain ranges targeted by prospectors and mining efforts. Gold, silver, copper, zinc, and lead were the fruits of their labor (Julyan, 2006). The Tres Hermanas Mountains are also considered one of the Apache Nation’s sacred mountain ranges (Mangas, personal communication, July 19, 2020). References: Balk, Robert, 1962, Geologic Map of Tres Hermanas Mountains: New Mexico State Bureau of Mines and Mineral Resources, Map 16, Scale 1:48000 Julyan, Robert, 2006, The Mountains of New Mexico, Albuquerque: University of New Mexico Press Leonard, Mary Lou, 1982, The geology of the Tres Hermanas Mountains, Luna County, New Mexico. Unpublished MS thesis, University of Texas at El Paso Mangas, Coloradas, 2020 All photos and videos were taken by Alexander F. O'Connor. Soundtrack by Alexander F. O'Connor. Video produced using Movie Maker 2012 by Microsoft Corporation. Music production, mixing, and editing made possible using Music Maker (64-bit) Version 33.1.0.16 by MAGIX Software GmbH. Full trip report: https://peakbagger.com/climber/ascent... This series is joyfully dedicated to my sisters: Monica, Linza, and Megan. I am not responsible for anyone choosing to explore the desert or mountains themselves. All persons are solely responsible for their own decision-making, whereabouts, well-being, and safety. Thank you for watching.