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Authigenic potassium feldspar in Cambrian carbonates: Evidence of Alleghanian brine migration

Science

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Abstract

The shallow-water limestones and dolostones of the Conococheague Limestone (Upper Cambrian) of western Maryland contain large amounts of authigenic potassium feldspar. The presence of halite daughter crystals in breached fluid inclusions, low whole-rock ratios of chlorine to bromine, and thermochemical data suggest that the potassium feldspar formed at low temperature by the reaction of connate brines with intercalated siliciclastic debris. Analyses of argon age spectra indicate that the authigenic feldspar probably formed during Late Pennsylvanian to Early Permian time. These results may indicate mobilization and migration of connate brines brought about by Alleghanian folding. The widespread occurrence of authigenic potassium feldspar in Cambrian and Ordovician carbonate rocks throughout the Appalachians suggests that this may have occurred throughout the entire basin.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Authigenic potassium feldspar in Cambrian carbonates: Evidence of Alleghanian brine migration
Series title:
Science
Volume
228
Issue:
4707
Year Published:
1985
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1529
Last page:
1531