Toward identifying potential causes for stratigraphic change in subtropical to tropical Laurentia during the Mohawkian (early Late Ordovician)

Achim D. Herrmann, Bernd Haupt

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Numerical models of the ocean-climate system indicate that during the early Late Ordovician, water from the higher southern latitudes flowed north toward the equator. The cold-water masses welled up into and penetrated the epicontinental sea of Laurentia. The "cold-water conditions" existed despite high levels of pCO 2 (∼15× preindustrial atmospheric levels) and did not necessarily indicate the onset of glaciation during the early Late Ordovician; rather the cold-water conditions may indicate the onset of a cooling event that plunged the Ordovician Earth system toward icehouse conditions that would lead later to the end-Ordovician (Hirnantian) glaciation. Furthermore, the observed distribution of cold-water masses across the southeastern margin of Laurentia is consistent with the interpretation that a cold-water event caused a regional extinction in the Mohawkian of eastern Laurentia.

Original languageEnglish (US)
Pages (from-to)29-35
Number of pages7
JournalSpecial Paper of the Geological Society of America
Volume466
DOIs
StatePublished - Jan 1 2010

All Science Journal Classification (ASJC) codes

  • Geology

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