Abstract

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. Systematic veins display distinct characteristics: the mean vein orientation rotates clockwise from 067° in the east to 086° farther west, veins do not propagate into the basal Lockport Group, and calcite vein δ18OPDB values are significantly lighter to the east of the Clarendon- Linden fault zone. Maximum horizontal stress (SH) trend lines drawn parallel to the strike of the systematic veins are incompatible with SH inferred from Alleghanian plateau and other post-Paleozoic structures. However, because east-west SH trend lines are compatible with an Acadian tectonic event in western New England, our interpretation is that systematic veins in the Lockport Group are a cratonward signature of the Acadian orogeny.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.