Dikes of Rand Hill, Northeast Adirondacks, as Paleostrain Indicators

摘要

Igneous dikes may be looked upon as paleostrain indicators, and hence as aids in reconstructing the strain history (and ideally, the stress history) of a region. As part of a larger study, dikes intrusive into Proterozoic (Helikian), granulite-facies rocks near Rand Hill in the northern Adirondack Mountains were investigated. Three types of dike rocks were observed: olivine diabase, diabase, and trachyte. This study is in preliminary stages and as more data are accumulated on dike trends, types, and K/Ar dates, a more complete paleostrain record will emerge, allowing controlled speculation on Paleozoic and Mesozoic structural events in the northern New York region.