Thermally induced chemical migration: a natural analog approach. Progress report, September 1984-September 1985
The objective has been to understand the extent and mechanisms of chemical migration in the broadest sense, i.e., over a range of temperatures and in diverse geologic media. Pegmatites are genetic links between ''normal granites'' and hydrothermal systems. At some stage in their crystallization history with falling temperature (and sometimes pressure) an aqueous fluid phase exsolves and coexists with a silicate melt. Little is known about the composition of these fluids, the element partitioning behavior between fluid and silicate melt, and how these fluids interact with previously crystallized granite. It is these fluids that ''leak'' out of the pegmatites and form the dispersion halos that we are studying. Research progress is reported in the following areas: (1) fluid evolution in the Notch Peak, Utah, metamorphic aureole; (2) tourmaline as a recorder of pegmatite evolution; (3) feldspar as a recorder of pegmatite evolution; (4) the distribution of boron among pegmatite minerals and the mass balance of boron in granitic pegmatite systems; (5) crystal chemical aspects of Li, Pb, and Cs partitioning between coexisting muscovite and biotite; (6) apatite as a recorder of pegmatite petrogenesis; (7) mineralogy and REE geochemistry of an S-type granite; (8) exomorphic aureoles as indicators of pegmatite fluid composition; (9) anatomy of a layered granite pluton; and (10) fractionation within a granitic system. (ACR)
- Research Organization:
- South Dakota School of Mines and Technology, Rapid City (USA)
- DOE Contract Number:
- FG01-84ER13259
- OSTI ID:
- 5741110
- Report Number(s):
- DOE/ER/13259-T1; ON: DE85012308
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mineral recorders of pegmatite internal evolution: REE contents of tourmaline from the Bob Ingersoll pegmatite, South Dakota
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Related Subjects
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
GRANITES
GEOCHEMISTRY
PEGMATITES
PETROGENESIS
APATITES
CHEMICAL COMPOSITION
FELDSPARS
MINERALOGY
ROCK-FLUID INTERACTIONS
SOUTH DAKOTA
TOURMALINE
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
BORON COMPOUNDS
BORON SILICATES
CHEMISTRY
FEDERAL REGION VIII
IGNEOUS ROCKS
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
PHOSPHATE MINERALS
PLUTONIC ROCKS
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
USA
580400* - Geochemistry- (-1989)
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