Stratigraphy and Geochemistry of Lower Permian volcanics in the Sverdrup Basin, Northwest Ellesmere Island, Nunavut | Posted on:2014-04-10 | Degree:M.Sc | Type:Thesis | University:University of Calgary (Canada) | Candidate:Morris, Natasha J | Full Text:PDF | GTID:2450390008451160 | Subject:Geology | Abstract/Summary: | | Five sections of Lower Permian mafic volcanics were examined on northwest Ellesmere Island in the Sverdrup Basin, Arctic Canada. Detailed field work shows that two stratigraphic levels exist; the lower level is an unnamed volcanic unit that occurs in a Sakmarian-Artinskian succession, and the upper level is a mappable unit, the Esayoo Formation, which occurs in a Kungurian succession. Within the regional upper Paleozoic sequence stratigraphy the volcanics are contemporaneous with transgressive systems tracts.;Petrographically, these volcanics are spilites. Trace element chemistry illustrates patterns similar to ocean island basalts. Tectonic discriminant diagrams show affinities to within plate basalts, with alkaline to transitional basalt affinities. Sm-Nd isotopic analyses suggest the Esayoo Formation is sourced from an enriched mantle, with 3tNd values that range from -3.99 to -5.87. Trace element ratios reveal an enriched mantle type I (EMI) source. In addition these volcanic occurences are synchronous with coeval compressional-extensional tectonic pulses associated with the Melvillian Disturbance. | Keywords/Search Tags: | Volcanics, Lower, Island | | Related items |
| |
|