Post-granulite facies fluid infiltration in the Adirondack Mountains

Journal Article · Wed Jun 01 00:00:00 EDT 1988 · Geology; (United States)

DOI:https://doi.org/10.1130/0091-7613(1988)016<0513:PGFFII>2.3.CO;2· OSTI ID:7024344

Morrison, J; Valley, J W

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), Vol. 16:6
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
ADIRONDACK MOUNTAINS
GEOLOGIC HISTORY
CALCITE
CARBON DIOXIDE
CATHODOLUMINESCENCE
CHLORITE MINERALS
CONTINENTAL CRUST
ENRICHMENT
EXPLORATION
GEOPHYSICAL SURVEYS
GRANITES
INTRUSION
NEW YORK
ORIGIN
RESERVOIR FLUIDS
ALKALINE EARTH METAL COMPOUNDS
APPALACHIAN MOUNTAINS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
EARTH CRUST
FEDERAL REGION II
FLUIDS
IGNEOUS ROCKS
LUMINESCENCE
MINERALS
MOUNTAINS
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
PLUTONIC ROCKS
ROCKS
SILICATE MINERALS
SURVEYS
USA
580100* - Geology &amp; Hydrology- (-1989)