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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 56 (1972)

Issue: 5. (May)

First Page: 871

Last Page: 881

Title: Diagenesis of Knox Group in Christiansburg Fenster, Southwestern Virginia

Author(s): Paul L. Broughton (2)


The recumbent northwest limb of the Christiansburg anticline is exposed in the eastern margin of the Christiansburg fenster, through the overlying Pulaski thrust sheet. The Knox Group of this autochthonous Saltville block was deposited in the shallow marine waters of the Appalachian miogeosyncline in Cambro-Ordovician time. A cyclic dolomitization-silicification diagenesis is apparent. The dolomitization was interrupted first by silicification that promoted quartz grain overgrowths. Later, carbonate cement was replaced by the silica, now microcrystalline chert. These relations are clearly demonstrated by zoned dolomite rhombs enveloped by authigenic overgrowths and chert nodules.

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