Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Neogene strontium isotope stratigraphy, foraminifer biostratigraphy, and lithostratigraphy from offshore wells, Queen Charlotte Basin, British Columbia, Canada

Marjorie J. Johns, Julie A. Trotter, Clio J. M. Bonnett and Christopher R. Barnes
Neogene strontium isotope stratigraphy, foraminifer biostratigraphy, and lithostratigraphy from offshore wells, Queen Charlotte Basin, British Columbia, Canada
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (September 2015) 52 (9): 795-822

Abstract

Strontium isotope ages of foraminifers from Early Miocene to Late Pliocene (Neogene) sequences (21.2-3.4 Ma) are reported for the first time from the Queen Charlotte Basin (QCB) in Queen Charlotte Sound, offshore British Columbia. These ages, together with a revised foraminifer biostratigraphy and log data from two offshore wells, provide a high-resolution chronostratigraphy for the southern part of the QCB. The data show thick 1717-2636 m Miocene sequences overlain by much thinner Pliocene and younger units (<240 m). Assessments of foraminifer biofacies indicate common transported neritic and shelf faunas into slope or bathyal environments where changes in basin water depths indicate significant deformation and erosion. Additional stratigraphic information for six offshore wells in Hecate Strait show the common occurrence of amorphous carbonates in the upper sections of the penetrated basin successions. Amorphous carbonates and coals are less common in the Harlequin D-86 and Osprey D-36 wells of Queen Charlotte Sound. Coals are especially common to abundant in the sedimentary sections penetrated by the Hecate Strait wells and are potential sources of seep fluids and gases. The occurrences of glassy-textured coals, zeolite-like minerals, recrystallized foraminifers, and inverted stratigraphic units in the basal parts of Miocene sub-basins indicate heating, deformation or slumping, and upward mobilization of fluids or gases after the Early Miocene. Results support syn-rift and post-rift depositional and deformational phases. Comparisons between the different geological processes and events in the Queen Charlotte and Tofino basins reveal details of the complex evolution of these Cenozoic basins, plate margins, and ridge junctions.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 52
Serial Issue: 9
Title: Neogene strontium isotope stratigraphy, foraminifer biostratigraphy, and lithostratigraphy from offshore wells, Queen Charlotte Basin, British Columbia, Canada
Affiliation: Pacific PaleoQuest, Brentwood Bay, BC, Canada
Pages: 795-822
Published: 201509
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 66
Accession Number: 2015-102944
Categories: StratigraphyApplied geophysicsIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes 4 appendices
Illustration Description: illus. incl. sects., strat. cols., 4 tables, geol. sketch map
N51°30'00" - N53°30'00", W132°00'00" - W130°00'00"
N48°00'00" - N49°30'00", W128°30'00" - W127°30'00"
Secondary Affiliation: University of Western Australia, AUS, AustraliaUniversity of Victoria, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Canadian Science Publishing, NRC Research Press, Ottawa, ON, Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201544
Close Modal

or Create an Account

Close Modal
Close Modal