Post-granulite facies fluid infiltration in the Adirondack Mountains
Granulite facies lithologies from the Adirondack Mountains of New York contain alteration assemblages composed dominantly of calcite +/- chlorite +/- sericite. These assemblages document fluid infiltration at middle to upper crustal levels. Cathodoluminescence of samples from the Marcy anorthosite massif indicates that the late fluid infiltration is more widespread than initially indicated by transmitted-light petrography alone. Samples that appear unaltered in transmitted light show extensive anastomosing veins of calcite (< 0.05 mm wide) along grain boundaries, in crosscutting fractures, and along mineral cleavages. The presence of the retrograde calcite documents paleopermeability in crystalline rocks and is related to the formation of high-density CO/sub 2/-rich fluid inclusions. Recognition of this process has important implications for studies of granulite genesis and the geophysical properties of the crust.
- Research Organization:
- Univ. of Wisconsin, Madison (USA)
- OSTI ID:
- 7024344
- Journal Information:
- Geology; (United States), Journal Name: Geology; (United States) Vol. 16:6; ISSN GLGYB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580100* -- Geology & Hydrology-- (-1989)
ADIRONDACK MOUNTAINS
ALKALINE EARTH METAL COMPOUNDS
APPALACHIAN MOUNTAINS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONATE MINERALS
CARBONATES
CATHODOLUMINESCENCE
CHALCOGENIDES
CHLORITE MINERALS
CONTINENTAL CRUST
EARTH CRUST
ENRICHMENT
EXPLORATION
FEDERAL REGION II
FLUIDS
GEOLOGIC HISTORY
GEOPHYSICAL SURVEYS
GRANITES
IGNEOUS ROCKS
INTRUSION
LUMINESCENCE
MINERALS
MOUNTAINS
NEW YORK
NORTH AMERICA
ORIGIN
OXIDES
OXYGEN COMPOUNDS
PLUTONIC ROCKS
RESERVOIR FLUIDS
ROCKS
SILICATE MINERALS
SURVEYS
USA