Paleo-redox context of the Mid-Devonian Appalachian Basin and its relevance to biocrises

Ruliang He, Wanyi Lu, Christopher K. Junium, Charles A. Ver Straeten, Zunli Lu

Research output: Contribution to journalArticle

Abstract

The Devonian Period witnessed the expansion of vascular land plants and an atmospheric oxygenation event associated with enhanced organic mass burial. The deposition of organic-rich shales (e.g. black shales of the Marcellus subgroup) and several biotic crises in the marine realm have been linked to Devonian ocean anoxia. However, it is not clear how redox conditions evolved in different parts of the water column in such a context of dynamic changes in the atmosphere-ocean system. To address this problem, we use the bulk carbonate I/Ca proxy on core samples from Yates County, NY, in order to reconstruct the water column redox history through the Onondaga Limestone into the lower Marcellus shale. On the secular scale, the range of I/Ca values support the notion of a Devonian rise in atmospheric oxygen, relative to time intervals earlier in the Paleozoic. In terms of Eifelian Stage stratigraphic trends, I/Ca ratios are generally stable and high in the Onondaga Formation but show large fluctuations in lower Marcellus strata. Low I/Ca ratios are found near the onset of organic-rich shale deposition indicating relatively reducing subsurface waters. The pattern of redox changes resembles that of contemporaneous sea-level changes. Finally, the reconstructed oxygenation changes are correlated to three biotic transitions in Devonian marine systems.

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Oxygenation
Shale
Water
oxygenation
basin
shale
Core samples
Calcium Carbonate
water column
Carbonates
Sea level
Eifelian
atmosphere-ocean system
redox conditions
anoxia
sea level change
Oxygen
Paleozoic
limestone
carbonate

Keywords

  • Atmospheric oxygen
  • Devonian
  • I/Ca
  • Marcellus shale

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Paleo-redox context of the Mid-Devonian Appalachian Basin and its relevance to biocrises. / He, Ruliang; Lu, Wanyi; Junium, Christopher K.; Ver Straeten, Charles A.; Lu, Zunli.

In: Geochimica et Cosmochimica Acta, 01.01.2020.

Research output: Contribution to journalArticle

He, Ruliang ; Lu, Wanyi ; Junium, Christopher K. ; Ver Straeten, Charles A. ; Lu, Zunli. / Paleo-redox context of the Mid-Devonian Appalachian Basin and its relevance to biocrises. In: Geochimica et Cosmochimica Acta. 2020.
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