40Ar/39Ar ages and geochemical characterization of Cretaceous bentonites in the Nanushuk, Seabee, Tuluvak, and Schrader Bluff formations, North Slope, Alaska
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- 作者：Grant T. Shimera ; shimergt@whitman.edu" class="auth_mail" title="E-mail the corresponding author ; Jeff A. Benowitzb ; Paul W. Layerb ; c ; Paul J. McCarthyc ; Catherine L. Hanksc ; Marwan Wartesd
- 关键词：Alaska ; Colville foreland basin ; Bentonite ; Argon&ndash ; argon dating ; Geochemistry
- 刊名：Cretaceous Research
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：57
- 期：Complete
- 页码：325-341
- 全文大小：3799 K
文摘
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We report the first publicly available 40Ar/39Ar age for a volcanogenic deposit in the Cretaceous Nanushuk Formation.
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Volcanic ash preservation in the Colville foreland basin began as early as the Albian and continued throughout the Late Cretaceous.
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Anomalous 40Ar/39Ar ages suggest contribution of xenocrysts or contamination with detrital micas from igneous or metamorphic sources.