Late Middle Ordovician environmental change and extinction: Harbinger of the late Ordovician or continuation of Cambrian patterns?

Mark E. Patzkowsky, L. M. Slupik, Michael Allan Arthur, R. D. Pancost, Katherine Haines Freeman

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

Positive excursions in carbon isotope compositions of carbonate (~3‰) and organic carbon (~4‰-6‰) from the late Middle Ordovician (middle Caradocian) of the midcontinent and the eastern United States indicate widespread increases in productivity and rates of organic carbon burial that may have drawn down atmospheric pCO 2 , precipitating global cooling, although not necessarily ice-sheet formation. These climatic changes were associated with regional orogenic uplift, a relative rise in sea level, changes in epeiric sea circulation patterns, and carbonate platform destruction that led to regional extinction of marine benthos. The combination of sea-level rise, changing ocean circulation, and extinction in the middle Caradocian is similar to the suite of environmental changes described for Cambrian biomere boundaries, suggesting shared causes for these events. In contrast, middle Caradocian environmental changes are markedly different from the environmental patterns associated with the Late Ordovician mass extinction, despite the evidence for long-term cooling from the Middle to the Late Ordovician.

Original languageEnglish (US)
Pages (from-to)911-914
Number of pages4
JournalGeology
Volume25
Issue number10
DOIs
StatePublished - Jan 1 1997

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Caradocian
Ordovician
environmental change
extinction
organic carbon
cooling
mass extinction
carbonate platform
sea level change
benthos
carbon isotope
ice sheet
uplift
carbonate
productivity
climate change

All Science Journal Classification (ASJC) codes

  • Geology

Cite this

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title = "Late Middle Ordovician environmental change and extinction: Harbinger of the late Ordovician or continuation of Cambrian patterns?",
abstract = "Positive excursions in carbon isotope compositions of carbonate (~3‰) and organic carbon (~4‰-6‰) from the late Middle Ordovician (middle Caradocian) of the midcontinent and the eastern United States indicate widespread increases in productivity and rates of organic carbon burial that may have drawn down atmospheric pCO 2 , precipitating global cooling, although not necessarily ice-sheet formation. These climatic changes were associated with regional orogenic uplift, a relative rise in sea level, changes in epeiric sea circulation patterns, and carbonate platform destruction that led to regional extinction of marine benthos. The combination of sea-level rise, changing ocean circulation, and extinction in the middle Caradocian is similar to the suite of environmental changes described for Cambrian biomere boundaries, suggesting shared causes for these events. In contrast, middle Caradocian environmental changes are markedly different from the environmental patterns associated with the Late Ordovician mass extinction, despite the evidence for long-term cooling from the Middle to the Late Ordovician.",
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Late Middle Ordovician environmental change and extinction : Harbinger of the late Ordovician or continuation of Cambrian patterns? / Patzkowsky, Mark E.; Slupik, L. M.; Arthur, Michael Allan; Pancost, R. D.; Freeman, Katherine Haines.

In: Geology, Vol. 25, No. 10, 01.01.1997, p. 911-914.

Research output: Contribution to journalArticle

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