Clay mineral authigenesis in coal and shale from the Anthracite region, Pennsylvania

E. J. Daniels, S. P. Altaner

Research output: Contribution to journalArticle

Abstract

Minerals in the shale, the coal matrix, and the nonsystematic cleat set are interpreted to represent authigenesis in a low-permeability environment (closed-system alteration); however, the assemblage sudoite + tosudite + rectorite in the systematic cleat set is interpreted to be the result of one or two stages of hydrothermal alteration (open-system alteration). We suggest that differences in minerals between the two nearly perpendicular cleat sets are the result of permeability differences which were maintained by an anisotropic lateral stress field created by plate convergence during the Alleghanian orogeny. -from Authors

Original languageEnglish (US)
Pages (from-to)825-839
Number of pages15
JournalAmerican Mineralogist
Volume75
Issue number7-8
StatePublished - Jan 1 1990

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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