Jurassic foraminifera from the Queen Charlotte Islands, British Columbia, Canada: Biostratigraphy, paleoenvironments and paleogeographic implications

Lower and Middle Jurassic (Sinemurian to Callovian) foraminifera were examined from 66 localities of the Queen Charlotte Islands, British Columbia, Canada. Over 200 species of well preserved benthic calcareous and agglutinated taxa belonging to 50 genera were identified. Foraminifera from the Lower...

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Published in:Palaeogeography, Palaeoclimatology, Palaeoecology
Main Authors: Kottachchi, N. (N.), Schroder-Adams, C. (Claudia), Haggart, J.W. (J. W.), Tipper, H.W. (H. W.)
Format: Article in Journal/Newspaper
Language:English
Published: 2002
Subjects:
Online Access:https://ir.library.carleton.ca/pub/23372
https://doi.org/10.1016/S0031-0182(01)00424-2
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spelling ftcarletonunivir:oai:carleton.ca:23372 2023-05-15T15:12:16+02:00 Jurassic foraminifera from the Queen Charlotte Islands, British Columbia, Canada: Biostratigraphy, paleoenvironments and paleogeographic implications Kottachchi, N. (N.) Schroder-Adams, C. (Claudia) Haggart, J.W. (J. W.) Tipper, H.W. (H. W.) 2002-06-01 https://ir.library.carleton.ca/pub/23372 https://doi.org/10.1016/S0031-0182(01)00424-2 en eng https://ir.library.carleton.ca/pub/23372 doi:10.1016/S0031-0182(01)00424-2 Palaeogeography, Palaeoclimatology, Palaeoecology vol. 180 no. 1-3, pp. 93-127 Foraminifera Jurassic North America Paleoenvironment Paleogeography Queen Charlotte Islands info:eu-repo/semantics/article 2002 ftcarletonunivir https://doi.org/10.1016/S0031-0182(01)00424-2 2022-02-06T21:51:12Z Lower and Middle Jurassic (Sinemurian to Callovian) foraminifera were examined from 66 localities of the Queen Charlotte Islands, British Columbia, Canada. Over 200 species of well preserved benthic calcareous and agglutinated taxa belonging to 50 genera were identified. Foraminifera from the Lower Jurassic are represented by an abundant and diverse, Tethyan-derived calcareous assemblage, with Boreally derived agglutinated taxa becoming gradually more dominant in the upper Lower Jurassic to lower Middle Jurassic. Sedimentary strata and their faunal components and position of hiatuses correlate approximately with the Jurassic eustatic sea-level curve. Sea-level changes have resulted in a variety of depositional environments ranging from deep-water euxinic shales with abundant tuff beds, characterized by small pyritized foraminifera, to a well oxygenated outer shelf setting, characterized by a major faunal increase, to shoreface sandstones and conglomerates with absent to rare benthic foraminifera. A gradual shallowing from a slope- to a shelf-dominated deposition, with a magmatic arc provenance, is suggested for the Lower Jurassic, changing in the Middle Jurassic to an inner shelf to upper shoreface setting dominated by sedimentary strata of volcaniclastic origin. A marked faunal turnover is observed in the Lower Jurassic Whiteaves Formation (middle Toarcian) with the extinction of several earlier species and the appearance of a new diverse assemblage of 225 taxa. This turnover is also observed in the ammonite and radiolarian assemblages of the Queen Charlotte Islands. In comparison to the dominantly Tethyan-derived taxa of pre-middle Toarcian age, many of the species from the middle Toarcian are found in northern latitudes such as on the northern slope of Alaska, Arctic Islands and the Northwest Territories. Hence, foraminifera, in conjunction with Article in Journal/Newspaper Arctic Foraminifera* Northwest Territories Alaska Carleton University's Institutional Repository Arctic Northwest Territories Canada British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Queen Charlotte ENVELOPE(-132.088,-132.088,53.255,53.255) Palaeogeography, Palaeoclimatology, Palaeoecology 180 1-3 93 127
institution Open Polar
collection Carleton University's Institutional Repository
op_collection_id ftcarletonunivir
language English
topic Foraminifera
Jurassic
North America
Paleoenvironment
Paleogeography
Queen Charlotte Islands
spellingShingle Foraminifera
Jurassic
North America
Paleoenvironment
Paleogeography
Queen Charlotte Islands
Kottachchi, N. (N.)
Schroder-Adams, C. (Claudia)
Haggart, J.W. (J. W.)
Tipper, H.W. (H. W.)
Jurassic foraminifera from the Queen Charlotte Islands, British Columbia, Canada: Biostratigraphy, paleoenvironments and paleogeographic implications
topic_facet Foraminifera
Jurassic
North America
Paleoenvironment
Paleogeography
Queen Charlotte Islands
description Lower and Middle Jurassic (Sinemurian to Callovian) foraminifera were examined from 66 localities of the Queen Charlotte Islands, British Columbia, Canada. Over 200 species of well preserved benthic calcareous and agglutinated taxa belonging to 50 genera were identified. Foraminifera from the Lower Jurassic are represented by an abundant and diverse, Tethyan-derived calcareous assemblage, with Boreally derived agglutinated taxa becoming gradually more dominant in the upper Lower Jurassic to lower Middle Jurassic. Sedimentary strata and their faunal components and position of hiatuses correlate approximately with the Jurassic eustatic sea-level curve. Sea-level changes have resulted in a variety of depositional environments ranging from deep-water euxinic shales with abundant tuff beds, characterized by small pyritized foraminifera, to a well oxygenated outer shelf setting, characterized by a major faunal increase, to shoreface sandstones and conglomerates with absent to rare benthic foraminifera. A gradual shallowing from a slope- to a shelf-dominated deposition, with a magmatic arc provenance, is suggested for the Lower Jurassic, changing in the Middle Jurassic to an inner shelf to upper shoreface setting dominated by sedimentary strata of volcaniclastic origin. A marked faunal turnover is observed in the Lower Jurassic Whiteaves Formation (middle Toarcian) with the extinction of several earlier species and the appearance of a new diverse assemblage of 225 taxa. This turnover is also observed in the ammonite and radiolarian assemblages of the Queen Charlotte Islands. In comparison to the dominantly Tethyan-derived taxa of pre-middle Toarcian age, many of the species from the middle Toarcian are found in northern latitudes such as on the northern slope of Alaska, Arctic Islands and the Northwest Territories. Hence, foraminifera, in conjunction with
format Article in Journal/Newspaper
author Kottachchi, N. (N.)
Schroder-Adams, C. (Claudia)
Haggart, J.W. (J. W.)
Tipper, H.W. (H. W.)
author_facet Kottachchi, N. (N.)
Schroder-Adams, C. (Claudia)
Haggart, J.W. (J. W.)
Tipper, H.W. (H. W.)
author_sort Kottachchi, N. (N.)
title Jurassic foraminifera from the Queen Charlotte Islands, British Columbia, Canada: Biostratigraphy, paleoenvironments and paleogeographic implications
title_short Jurassic foraminifera from the Queen Charlotte Islands, British Columbia, Canada: Biostratigraphy, paleoenvironments and paleogeographic implications
title_full Jurassic foraminifera from the Queen Charlotte Islands, British Columbia, Canada: Biostratigraphy, paleoenvironments and paleogeographic implications
title_fullStr Jurassic foraminifera from the Queen Charlotte Islands, British Columbia, Canada: Biostratigraphy, paleoenvironments and paleogeographic implications
title_full_unstemmed Jurassic foraminifera from the Queen Charlotte Islands, British Columbia, Canada: Biostratigraphy, paleoenvironments and paleogeographic implications
title_sort jurassic foraminifera from the queen charlotte islands, british columbia, canada: biostratigraphy, paleoenvironments and paleogeographic implications
publishDate 2002
url https://ir.library.carleton.ca/pub/23372
https://doi.org/10.1016/S0031-0182(01)00424-2
long_lat ENVELOPE(-125.003,-125.003,54.000,54.000)
ENVELOPE(-132.088,-132.088,53.255,53.255)
geographic Arctic
Northwest Territories
Canada
British Columbia
Queen Charlotte
geographic_facet Arctic
Northwest Territories
Canada
British Columbia
Queen Charlotte
genre Arctic
Foraminifera*
Northwest Territories
Alaska
genre_facet Arctic
Foraminifera*
Northwest Territories
Alaska
op_source Palaeogeography, Palaeoclimatology, Palaeoecology vol. 180 no. 1-3, pp. 93-127
op_relation https://ir.library.carleton.ca/pub/23372
doi:10.1016/S0031-0182(01)00424-2
op_doi https://doi.org/10.1016/S0031-0182(01)00424-2
container_title Palaeogeography, Palaeoclimatology, Palaeoecology
container_volume 180
container_issue 1-3
container_start_page 93
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