Author: Mei, Shilong

Source: Canadian Journal of Earth Sciences, Volume 46, Number 1, January 2009 , pp. 41-65(25)

Publisher: NRC Research Press

Abstract:

This paper presents the results of structural mapping in the Peace River Arch region, obtained by applying a refined trend surface analysis to existing well-log data. Maps generated with the new approach allow for accurate location of formation-top offsets and recognition of faults associated with small, metre-scale offsets. Consequently, new faults were identified in the Mesozoic strata, and faults previously recognized as only offsetting Paleozoic strata were found to extend into the Cretaceous strata but with much smaller formation-top offsets. This provided direct evidence for re-activation of the Dawson Creek Graben Complex (DCGC) during the Cretaceous. An additional structural feature named Clear River Graben was recognized to have affected Permian to Jurassic strata. Relationships among previously interpreted faults were clarified and the structural controls on the DCGC were more accurately evaluated.

Cet article présente les résultats de la cartographie structurale de la région de Peace River Arch, produite par l'application d'une analyse raffinée du comportement des surfaces à des données de diagraphie de puits. Les cartes produites avec la nouvelle approche situent avec précision le décalage des sommets de formation et elles indiquent les failles associées aux petits décalages, de l'ordre du mètre. En conséquence, de nouvelles failles ont été identifiées dans les strates mésozoïques et il a été découvert que des failles antérieurement reconnues pour décaler les strates paléozoïques s'étendaient dans les strates du Crétacé, mais avec des décalages bien moindres des sommets des formations. Cela a fourni des évidences directes pour une réévaluation du Complexe du graben de Dawson Creek «DCGC» au Crétacé. Un élément structural additionnel, le graben de Clear River, a affecté les strates datant du Permien au Jurassique. Les relations entre des failles interprétées antérieurement ont été clarifiées et les contrôles structuraux sur le DCGC ont été évalués de manière plus précise.

Document Type: Research article

Publication date: 2009-01-01

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• Published since 1963, this monthly journal reports current research in climate and environmental geoscience; geoarchaeology and forensic geoscience; geochronology and geochemistry; geophysics; GIS and geomatics; hydrology; mineralogy and petrology; mining and engineering geology; ore deposits and economic geology; paleontology, petroleum geology and basin analysis; physical geography and Quaternary geoscience; planetary geoscience; sedimentology and stratigraphy; soil sciences; and structural geology and tectonics. It also publishes special issues that focus on information and studies about a particular segment of earth sciences.
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