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Insights into the Devonian-Carboniferous transition and Hangenberg event from delta (super 13) C (sub carb) and (super 87) Sr/ (super 86) Sr chemostratigraphy of shallow platform carbonate strata of northwestern Colorado

James W. Hagadorn, Bonita L. Lahey, Linda K. Soar, Mark W. Longman, D. Jeffrey Over and Ryan D. Mills
Insights into the Devonian-Carboniferous transition and Hangenberg event from delta (super 13) C (sub carb) and (super 87) Sr/ (super 86) Sr chemostratigraphy of shallow platform carbonate strata of northwestern Colorado
Rocky Mountain Geology (June 2022) 57 (1): 23-33

Abstract

Paired chemostratigraphic and biostratigraphic data suggest that the Devonian-Carboniferous boundary and the Hangenberg extinction event are recorded in the Coffee Pot Member of the Dyer Formation of the White River uplift region of northwestern Colorado. The Hangenberg isotopic excursion interval occurs in biostratigraphically depauperate shallow platform micritic dolostone and limestone representing the aculeatus-?ultimus-kockeli? Zone. The Hangenberg interval strata have delta (super 13) C (sub carb) values up to 7.69 ppm, and locally contain ooids, stromatolites, and other microbial structures. In three sections, there is a short-lived >4 ppm "pre-Hangenberg" positive excursion that is associated with the presence of detrital dolomite siltstone. The main Hangenberg isotopic signature exists in overlying strata, and is replicated in four different sections of the Dyer Formation across an area approximately 300 km (super 2) . In each section, the excursion interval is preceded by, and in one location is interrupted by, evidence of meteoric diagenesis and/or emergence characterized by macroscopic dissolution features and pronounced negative delta (super 13) C (sub carb) values (to ca. -6 ppm). Conodont (super 87) Sr/ (super 86) Sr ratios through the Dyer Formation dip to nearly 0.708 during the onset of the Hangenberg Event, consistent with the brachiopod based (super 87) Sr/ (super 86) Sr nadir from the same interval in Missouri, France, and Germany. The least-radiogenic trendline through the Dyer (super 87) Sr/ (super 86) Sr record matches the global minimum (super 87) Sr/ (super 86) Sr trendline through the Famennian-Tournaisian transition and infills several gaps in the global record.


ISSN: 1555-7332
EISSN: 1555-7340
Serial Title: Rocky Mountain Geology
Serial Volume: 57
Serial Issue: 1
Title: Insights into the Devonian-Carboniferous transition and Hangenberg event from delta (super 13) C (sub carb) and (super 87) Sr/ (super 86) Sr chemostratigraphy of shallow platform carbonate strata of northwestern Colorado
Affiliation: Denver Museum of Nature and Science, Department of Earth Sciences, Denver, CO, United States
Pages: 23-33
Published: 202206
Text Language: English
Publisher: University of Wyoming, Dept. of Geology and Geophysics, Laramie, WY, United States
References: 55
Accession Number: 2022-038007
Categories: StratigraphyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map, strat. col.
N39°00'00" - N39°49'60", W107°49'60" - W107°00'00"
Secondary Affiliation: SUNY Genesco, Genesco, NY, USA, United StatesUniversity of North Carolina at Chapel Hill, Chapel Hill, NC, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, copyright, University of Wyoming. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2022
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