Stable isotope evidence for the petrogenesis and fluid evolution in the Proterozoic Harney Peak leucogranite, Black Hills, South Dakota

P.I.N.belek;; G.T.H.eussler

Geochimica et Cosmochimica Acta 56(1): 403-417


ISSN/ISBN: 0016-7037
DOI: 10.1016/0016-7037(92)90141-5
Accession: 020085596

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Oxygen and hydrogen isotope systematics of the Proterozoic Harney Peak Granite, Black Hills, South Dakota, were examined in order to constrain its petrogenesis and to examine the role of fluids in a peraluminous granite-pegmatite magmatic system. The leucogranite and its satellite intrusions were emplaced as hundreds of sills and dikes which are texturally heterogeneous, ranging from aplitic to pegmatitic. The dominant ferromagnesian mineral in the core of the granite is biotite while along its perimeter and in satellite intrusions it is tourmaline. Biotite and tourmaline are for the most part mutually exclusive.