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

Journal Article · Wed Jan 01 00:00:00 EST 1992 · Geochimica et Cosmochimica Acta; (United States)

DOI:https://doi.org/10.1016/0016-7037(92)90141-5· OSTI ID:7049698

Nabelek, P I ^[1]; Russ-Nabelek, C; Haeussler, G T ^[2]

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1. Univ. of Missouri, Columbia (United States) Centre National de la Recherche Scientifique, Orleans (France)
2. Univ. of Missouri, Columbia (United States)

Oxygen and hydrogen isotope systematics of the Proterozoic Harney Peak Granite were examined in order to constrain its petrogenesis and to examine the role of fluids in a peraluminous granite-pegmatite magmatic system. It is shown that fractional crystallization or subsolidus interaction of the Harney Peak Granite with the magmatic fluid or a fluid derived from the schist cannot explain the difference between the {delta}{sup 18}O values of the core and perimeter granites. Although some oxygen isotope heterogeneity in the granite could be explained by assimilation of the country rocks, assimilation cannot explain all of the difference between the two granite types. Instead, it is proposed that intrusion of the magma which led to the biotite granites in the core of the pluton at the culmination of regional metamorphism initiated melting of the schists at a depth somewhat greater than the present level of erosion. The melts were emplaced into the overlying schist and differentiated into the many tourmaline-rich granite-pegmatite sills and dikes comprising much of the perimeter of the Harney Peak Granite and its satellite plutons. Alternatively, the different melts may have resulted from melting along an isotopically heterogeneous vertical section of the crust in response to the ascent of a thermal pulse.

• OSTI ID: 7049698
• Journal Information: Geochimica et Cosmochimica Acta; (United States), Vol. 56:1; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
15 GEOTHERMAL ENERGY
GEOLOGIC FORMATIONS
GEOCHEMISTRY
GRANITES
ISOTOPE RATIO
PETROGENESIS
SOUTH DAKOTA
BIOTITE
CRYSTALLIZATION
DEUTERIUM
DIKES
EXPERIMENTAL DATA
MAGMA
MAGMATIC WATER
MINERALOGY
MUSCOVITE
OXYGEN 18
PALEOTEMPERATURE
PRECAMBRIAN ERA
RESERVOIR TEMPERATURE
ROCK-FLUID INTERACTIONS
SCHISTS
TOURMALINE
CHEMISTRY
DATA
DEVELOPED COUNTRIES
EVEN-EVEN NUCLEI
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGIC STRUCTURES
GROUND WATER
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
IGNEOUS ROCKS
INFORMATION
ISOTOPES
LIGHT NUCLEI
METAMORPHIC ROCKS
MICA
MINERALS
NORTH AMERICA
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PHASE TRANSFORMATIONS
PLUTONIC ROCKS
ROCKS
SILICATE MINERALS
STABLE ISOTOPES
USA
WATER
580000* - Geosciences
152001 - Geothermal Data & Theory- Properties of Aqueous Solutions