Publication Summary
Issue ID: P2017-01-03
Title: Mapping in the Tatsi and Zymo ridge areas of west-central British Columbia: Implications for the origin and history of the Skeena Arch
Author(s): Angen, J.J., Nelson, J.L., Rahimi, M., Hart, C.J.R.
Series Name: Paper
Publication Year: 2017
Larger Work Citation: in Geological Fieldwork 2016, B.C. Ministry of Energy and Mines, Paper 2017-01
NTS Map Sheet(s): 092;093;094;102;103;104;114
Place Keyword(s): British Columbia, Tatsi, Zymo Ridge, west-central British Columbia
Lat/Long (NSWE): 59, 50, -134, -122
Theme Keyword(s): Skeena arch, Skeena Group, Netalzul volcanics, Telkwa Formation, Bulkley Suite
Economically significant porphyry and related mineralization is genetically associated with the Bulkley (Late Cretaceous) and Babine and Nanika intrusive suites (Eocene) in central British Columbia. These intrusions and mineral occurrences are largely restricted to the Skeena arch, a northeast-trending paleohigh that extends transverse to the general trend of Stikine terrane. Elongate intrusions and linear trends of intrusions that suggest emplacement was partially localized along the Skeena arch, and strata of the Skeena Group (Lower Cretaceous) are deformed into northeast trending folds. Stratigraphic relationships across the Skeena arch indicate that it became an arc-transverse paleotopographic high between the Middle Jurassic and Early Cretaceous. The northeast-trending folds, along with the northeasterly orientation of plutonic suites and the Skeena arch as a whole, are thought to be manifestations of a fundamental arc-transverse structural anisotropy.