Mineral reactions and controls on zeolite facies alteration in sandstone of central Transantarctic Mountains, Antarctica

Conference · Tue Mar 01 04:00:00 EST 1983 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:5828510

Vavra, C L

Volcanic sandstones of the Fremouw and Falla formations contain abundant zeolite-facies authigenic minerals. Mineral and chemical patterns in Fremouw and Falla sandstone suggest that porosity and authigenic mineralogy were controlled by parent material composition, fluid chemistry, permeability, and temperature. Mineral patterns suggest simple rock-fluid reactions in which unstable volcanic rock fragments and plagioclase grains were altered to clay, heulandite, albite, laumontite, and/or prehnite. Chemical patterns suggest that significant mass transfer of Na+, Ca+2 and Si+4 occurred in the sandstone during alteration, whereas Al+3 mobility was restricted and was incorporated into clay and/or zeolite cements. These cements typically reduced primary porosity to a few percent; however, some secondary porosity was created by the dissolution of detrital plagioclase grains.

• OSTI ID: 5828510
• Report Number(s): CONF-8304200-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 67:3
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ANTARCTIC REGIONS
ANTARCTICA
GEOLOGIC FORMATIONS
IGNEOUS ROCKS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALIZATION
MINERALOGY
MINERALS
MOUNTAINS
PERMEABILITY
PETROGENESIS
POLAR REGIONS
POROSITY
ROCK-FLUID INTERACTIONS
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
VOLCANIC ROCKS
ZEOLITES