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Atlin TGI, Part VI: Early to Middle Jurassic Sedimentation, Deformation and a Preliminary Assessment of Hydrocarbon Potential, Central Whitehorse Trough and Northern Cache Creek Terrane

The Whitehorse Trough is an Early to Middle Jurassic marine basin, which extends from southern Yukon to Dease Lake in British Columbia. It flanks oceanic crustal rocks to the east, including thick platformal carbonate and argillaceous chert successions of the northern Cache Creek terrane (Figure 1). Early studies recognised the low metamorphic grade of these sedimentary rocks (e.g. Monger, 1975) and their potential to host hydrocarbon accumulations (e.g. Gilmore, 1985; Hannigan et al., 1995; National Energy Board, 2001). However, early assessments were based on data from samples collected in southern Yukon (Gilmore, 1985; National Energy Board, 2001); these data indicate that the Whitehorse Trough in the Yukon is gas-prone. It is not known if potential hydrocarbon traps were filled and preserved, as none have been drilled. Structural complexity and metamorphic grade decreases in the British Columbia portion of the Trough. On the basis of flat-lying Eocene volcanic rocks, no widespread deformation post-dates Early Eocene time (Mihalynuk, 1999). Indeed, undeformed Middle Jurassic plutons cut all major fabrics within the Whitehorse Trough in BC. Deformation is therefore constrained in age to between about 172 and 170 Ma the age of youngest deformed strata and oldest cross-cutting plutons (e.g. Mihalynuk et al., 1999). Such a simple deformational history limits the possibility of hydrocarbon escape subsequent to generation, during successive deformational events. An uncomplicated history also simplifies thermal maturation modeling. Previous assessments in BC were based on extrapolation from the Yukon portion of the Trough.