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Full-Text Articles in Physical Sciences and Mathematics
Analyzing Ductile Shear Zone Network Geometries In The Grassy Portage Sill, Rainy Lake Region, Northwestern Ontario, Canada, Ernest John Thalhamer
Analyzing Ductile Shear Zone Network Geometries In The Grassy Portage Sill, Rainy Lake Region, Northwestern Ontario, Canada, Ernest John Thalhamer
Theses and Dissertations
The Grassy Portage Sill (GPS) is a ~2.7 Ga metagabbroic sill located in the Rainy Lake region of northwestern Ontario. The Rainy Lake region is located in the Superior Province between the metavolcanic Wabigoon subprovince to the north and the metasedimentary Quetico subprovince to the south. Two regional faults bound the region and intersect to the east, forming a wedge which defines the Rainy Lake zone. This area was regionally deformed due to oblique transpression, resulting from the Kenoran Orogeny (~2.7 Ga). The GPS is approximately 20 km long and 1-2 km wide, and has undergone heterogeneous strain along its …
The Rice Bay And Northeast Bay Gneiss Domes: A Kinematic Study Of Competent Rock Bodies In The Rainy Lake Region Of Ontario, Canada, Jane Block
Theses and Dissertations
The Rice Bay and Northeast Bay gneiss domes (RBD and NEBD) are two tonalitic rock units located in the Archean Rainy Lake zone of the Superior Province. The Rainy Lake zone acts as a boundary between two subprovinces, accommodating transpression, significant shortening and dextral motion in its lithologic assemblage. This study contributes to understanding how deformation is partitioned in heterogeneous terranes, and also demonstrates a practical method of kinematic analysis. Foliations, lineations, shear zones, tension gashes, quartz veins, mafic enclaves, and folded and boudined veins were all utilized in the kinematic analysis. Foliation orientations in both domes are consistent with …