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Hydrothermal Events in the Bowser Basin: Preliminary Paleomagnetic Studies

This study analyzes paleomagnetic data from the Bowser Basin, indicating significant hydrothermal activity possibly linked to Lower Jurassic volcanics. Severe deformation and fluid events in the basin are explored, with little diagenetic alteration observed post-tectonics.

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Hydrothermal Events in the Bowser Basin: Preliminary Paleomagnetic Studies

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  1. Hydrothermal Events in the Bowser Basin:Preliminary Paleomagnetic Studies Randy Enkin, Judith Baker, Carol Evenchick Geological Survey of Canada - Pacific

  2. Foreland Belt Remagnetization Enkin, Osadetz, Baker and Kisilevsky, GSA Bull., 112, 929-942, 2000

  3. Bowser Basin OweegeeDome

  4. Oweegee Dome

  5. Overturned Fold on Oweegee Dome

  6. Paleomagnetic Field Tests

  7. Tertiary Extensional Veins

  8. Preliminary Paleomagnetism • M Jurassic Bowser Turb’s • Late syn-tectonic (Paleogene?) remagnetization • Predates extensional veins • Not rotated • L Jurassic Hazelton Volc’s • Indeterminate stability (tilt and conglomerate tests: Remanence could pre- or post-date tilting • Flows and sediments • Large CCW rotation • Triassic Stuhini Turbidites • Negative tilt test: Remanence post-dates major tilting • Predates extensional veins • Large CCW rotation • Similar to Stuhini Turbidites • Permian Stikine Limestones

  9. Conclusions • The sub-Bowser Group (pre-Middle Jurassic) suffered a pervasive hydrothermal event.

  10. Conclusions • The sub-Bowser Group (pre-Middle Jurassic) suffered a pervasive hydrothermal event. • This event was probably driven by heat from the Lower Jurassic Hazelton volcanics and was accompanied by severe deformation.

  11. Conclusions • The sub-Bowser Group (pre-Middle Jurassic) suffered a pervasive hydrothermal event. • This event was probably driven by heat from the Lower Jurassic Hazelton volcanics and was accompanied by severe deformation. • Subsequent tectonics, including the Skeena Fold Belt Orogeny, left little observable diagenetic alteration.

  12. Conclusions • The sub-Bowser Group (pre-Middle Jurassic) suffered a pervasive hydrothermal event. • This event was probably driven by heat from the Lower Jurassic Hazelton volcanics and was accompanied by severe deformation. • Subsequent tectonics, including the Skeena Fold Belt Orogeny, left little observable diagenetic alteration. • The Bowser Group was affected by a late syntectonic hydrothermal event, showing that there were multiple fluid events in the basin.

  13. Oil Released During Sampling • Seen in turbidites, limestones and even volcanics

  14. Ritchie Mountain (Bowser Group) with Oweegee Dome in background

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