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Deposition in anoxic Taconic foreland basin, late Middle Ordovician, New York

Conference · · Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:5685677
;
The Taconic foreland basin resulted from a collision between the North American craton and the Ammonoosuc arc. The basin is positioned between a broad carbonate shelf on the west and the clastic arc terrane. In the downslope direction, basin deposits changed from distal shelf carbonates (Trenton Limestone), to coeval interbedded hemipelagic black shales and calcilutites on the slope (Dolgeville Formation and Utica Shale), to silty shales, siltstones, and sandstones laid down by turbidites on the basin floor (Snake Hill Shale). From the distribution of organic carbon and the concentration of benthic epifauna and infauna, it can be inferred that conditions were aerobic on the shelf (>1 ml/L O/sub 2/), anaerobic on the slope (<0.4 ml/L O/sub 2/), and dysaerobic on the basin floor (<1 ml/L O/sub 2/). Through time, four long-term anaerobic and dysaerobic cycles are revealed, lasting between 500,000 and 1,000,000 yr. Anaerobic cycles are characterized by over 50% higher organic carbon values, lack of infaunal burrowing traces, and a highly impoverished benthic epifauna. Dysaerobic cycles are marked by lower organic carbon contents, sporadic burrowing traces, and a slightly more diverse and abundant benthic epifauna. The longest anaerobic cycle occurred during the transgressive phase that led to widespread deposition of black shale over the carbonate platform. Anoxic conditions in the Taconic foreland basin may have been influenced by the prevailing global oceanographic conditions during the Middle Ordovician.
Research Organization:
Massachusetts Institute of Technology, Cambridge
OSTI ID:
5685677
Report Number(s):
CONF-8410269-
Conference Information:
Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 68:12
Country of Publication:
United States
Language:
English

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