NH+4 in pegmatitic feldspars from the southern Black Hills, South Dakota

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Authors:Solomon, G. Cleve; Rossman, George R.
Author Affiliations:Primary:
Calif. Inst. Technol., Div. Geol. and Planet. Sci., Pasadena, CA, United States
Volume Title:American Mineralogist
Source:American Mineralogist, 73(7-8), p.818-821. Publisher: Mineralogical Society of America, Washington, DC, United States. ISSN: 0003-004X
Publication Date:1988
Note:In English. Calif. Inst. Technol., Div. Geol. and Planet. Sci., Contrib. No. 4470. 19 refs.; illus. incl. 1 table
Summary:Trace amounts of ammonium ion (0.7 mol % NH+,4 substitution) have been identified from the IR spectra of alkali feldspars from pegmatites occurring in the southern Black Hills district, South Dakota. The spectroscopic data indicate that the ammonium is structurally bound, most likely in the M site of the microcline. These results indicate that ammonium was probably a component of metamorphic fluids present during anatexis of metasedimentary rocks in the southern Black Hills district. [Authors' abstract] [J.A.Z.]
Subjects:Alkali feldspar; Ammonium ion; Anatexis; Feldspar group; Framework silicates; Granites; Igneous rocks; Infrared spectra; Metamorphism; Microcline; Minerals; Pegmatite; Petrology; Plutonic rocks; Silicates; Spectra; Black Hills; Custer County South Dakota; Pennington County South Dakota; South Dakota; United States; Buddingtonite; Keystone; Southwestern South Dakota
Abstract Numbers:89M/2218
Record ID:1988071172
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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