Magmatism and metamorphism in the Leech River Complex, southern Vancouver Island, British Columbia, Canada: Implications for Eocene tectonics of the Pacific Northwest

The Leech River Complex of southern Vancouver Island consists of the Leech River Schist and Mesozoic and Eocene deformed igneous rocks. In the study area, the igneous rocks consist of the Walker Creek intrusions, and two previously unrecognized intrusive units, the Tripp Creek metabasite and the Jordan River metagranodiorite. The Walker Creek intrusions occur as peraluminous, tonalitic dykes that are interfoliated with the Leech River Schist, and range in width from several centimetres to several metres. The Tripp Creek metabasite occurs as between 5 and 12 actinolite-chlorite-biotite-garnet schist and metagabbro interfoliated with the pelitic Leech River Schist. The Jordan River metagranodiorite consists of a large, homogenous, foliated to massive biotite granodiorite and several related dykes. The study area is bounded on the south by the Leech River Fault, a 500 m-wide sinistral oblique shear zone.; Metamorphic grade in the study area ranges from zeolite-facies in the Metchosin Igneous Complex rocks to amphibolite-facies in the southern Leech River Complex. (Abstract shortened by UMI.)...