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 language | English (US) |
|---|---|
| Pages (from-to) | 825-839 |
| Number of pages | 15 |
| Journal | American Mineralogist |
| Volume | 75 |
| Issue number | 7-8 |
| State | Published - 1990 |
ASJC Scopus subject areas
- Geophysics
- Geochemistry and Petrology