New Insights into the Tectonic and Metamorphic Architecture of the Composite Arc Belt and the Frontenac-Adirondack Belt near Perth, Ontario, Grenville Orogen – Michael Easton (Ontario Geological Survey).
This is a Pre-conference field trip, Duration: 1 day (May 14): Note: Trip starts in Kingston the morning of May 14 (Sunday) and ends in Kingston the evening of May 14. Located adjacent to Highway 7, the Maberly shear zone is one most accessible structural features in the Grenville Orogen. It is also one of the oldest (circa 1162 Ma) and represents the boundary between the Composite Arc and the Frontenac-Adirondack belts. This one-day trip highlights the results of recent detailed studies by the Ontario Geological Survey. The fieldtrip will examine key outcrop exposures providing evidence of the tectonic, magmatic and metamorphic history of this boundary. Field trip discussions will focus on the evidence for higher metamorphic pressures than previously thought, the character of the pre-Frontenac intrusive suite (circa 1178-1160 Ma), and the relationship between metasomatic mica-apatite-pyroxenite rocks of the Frontenac-Adirondack Belt and their tectonic equivalents in the CMB boundary zone. The trip compliments both the session on the Metamorphic Architecture of Orogenic Belts and the post-meeting trip on the Tectonic and Metamorphic Architecture of the northeastern Composite Arc Belt and the Central Metasedimentary Belt boundary tectonic zone. The trip will begin and end in Kingston, Ontario. This field trip is sponsored by the Canadian Tectonics Group.