Nature, Distribution, Thickness and Regional Structural Framework of Eocene Volcanic Centres in Nechako Basin, South-Central British Columbia

Lead Researcher(s):  C. J. R. Hart

Project ID:  2009-046

Key Research Organization(s):  University of British Columbia - MDRU

Project Location:  Nechako Basin

Strategic Focus Area:  Energy-Oil and Gas


This project was a 15 month study that combines an expert project team and a wide range of techniques to determine and assess the distribution, nature and thickness of Eocene volcanic rocks, and to evaluate the regional Eocene structural regime in the southern Nechako basin of south‐central British Columbia. This project compiles and integrates a wide range of existing geological, geochemical, geophysical, and geochronological datasets on GIS and 3D platforms.

Geoscience BC Report 2016-12 contains a new geological map of a portion of the Chilcotin and Nechako Plateau. The map highlights previously unmapped rock outcrops and will support mineral exploration in aregion which is known for poor rock exposure. The 1:100 000 scale geology map is in pdf format, and supported with GIS files, a field and analytical database and a brief report.

Geoscience BC Report 2011-13 presents the preliminary interpretations of an ongoing PhD thesis project by Esther Bordet. The report documents new mapping and proposes an improved stratigraphic and structural model for the Eocene period in the Nechako Basin. Characterization of the nature, thickness and structural framework of Eocene volcanic rocks in the Nechako region provides new insights into the area's Early Cenozoic history, contributes to improved interpretations and adds value to existing geophysical, particularly seismic and magnetotelluric, data sets.

The proposed GIS thickness model combined with interpreted structural and stratigraphic lineaments can be compared with magnetotelluric and seismic 2D profiles to define the structure of the underlying basin and interpret the abrupt changes in the thickness of the overlying Paleocene and Eocene packages. In addition, physical property measurements of mapped lithologies help constrain the geophysical responses of these rocks. The new stratigraphic and structural model proposed for the Eocene volcanic sequence will provide a more robust framework for future mineral and oil & gas exploration in the Nechako region.