Veins in the Lockport dolostone: evidence for an Acadian fluid circulation system

The orientation and spatial distribution of veins in the Lockport dolostone attest to a fluid circulation system active during the Acadian orogeny in western New York and southern Ontario. Outcrops east of the Clarendon-Linden fault zone are cut by a prominent east-northeast systematic calcite-filled vein set, whereas these systematic veins are absent west of the fault zone, except in two quarries. Maximum horizontal stress (S _H ) trend lines drawn parallel to the strike of the systematic veins are incompatible with S _H inferred from Alleghanian plateau and other post-Paleozoic structures. However, because east-west S _H trend lines are compatible with an Acadian tectonic event in western New England, systematic veins in the Lockport Group are a cratonward signature of the Acadian orogeny. -from Authors