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- W4383213648 abstract "Thin dikes and sills (3 ft to 40 ft thick) of diorite and minor camptonite of Tertiary age (44.2 +/- 2.2 m.y.), intruded into Paleozoic sediments, are the dominant igneous rocks of the Sacramento Mountains. The diorite and camptonite are similar mineralogically, but differ texturally. The camptonites have large (up to 30 mm) phenocrysts of euhedral hornblende and altered diopsidic augite with minor phenocrysts (5 mm) of plagioclase (Ana 0-45). The dominant phenocrysts of the diorite are plagioclase (An4 0-4 5) up to 5 mm long accompanied by minor euhedral hornblende and altered diopsidic augite (12 mm maximum). Both rocks have a ground-mass of plagioclase laths, interstitial chlorite, magnetite, minor orthoclase, and apatite. These rocks are comagmatic. The paragenetic sequence (olivine?-pyroxenehornblende-reaction of olivine and pyroxene-plagioclase) is similar to that described by Yoder and Tilley (1962) for alkaline basaltic magmas with H2O pressure between 2 to 5 kb (kilobars). After total olivine resorption, but before total pyroxene resorption, the pressure dropped due to intrusion. Differences in mineralogy and texture are the result of flow differentiation (Asquith, 1973b). With a high rate of discharge from the magma chamber, strong magma currents picked up the large hornblende and augite crystals concentrated at the base of the magma chamber, and intruded them along with smaller crystals of hornblende, augite, and minor plagioclase -- forming a camptonite." @default.
- W4383213648 created "2023-07-06" @default.
- W4383213648 creator A5042152689 @default.
- W4383213648 date "1974-01-01" @default.
- W4383213648 modified "2023-10-01" @default.
- W4383213648 title "Petrography and petrogenesis of Tertiary camptonites and diorites, Sacramento Mountains, New Mexico" @default.
- W4383213648 doi "https://doi.org/10.58799/c-141" @default.
- W4383213648 hasPublicationYear "1974" @default.
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