Abstract

Multiple stages of tectonic veining are preserved in the Mississippian Madison Group within the Absaroka thrust sheet. Three groups of veins have been defined on the basis of structural relationships and stable isotopic character. Group I veins consist of mineralized stylolite and joint surfaces which are oriented normal to both bedding and tectonic transport. Group II veins are filled fractures oriented normal to bedding and parallel to transport. Group III veins occur only in thin bedded limestones of the lower Madison Group and are mineralized bedding-parallel slip surfaces. Calcite twinning strains from each group indicate that, with rare exceptions, all veins formed pretectonically or syntectonically.

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