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James E. Day
Illinois State University
26Publications
7H-index
151Citations
Publications 28
Newest
#1Benjamin Thornton Iglar Uveges (SU: Syracuse University)H-Index: 1
#2Christopher K. Junium (SU: Syracuse University)H-Index: 11
Last.James E. Day (ISU: Illinois State University)H-Index: 7
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Abstract The Frasnian-Famennian biotic crisis is marked by two distinct intervals known as the Lower and Upper Kellwasser Events (KWEs) that in many locations are associated with deposition of organic-rich shales. Sedimentary nitrogen and carbon isotopes offer insight into the biogeochemical processing of nutrients, production of organic matter, and palaeoceanographic conditions during the KWEs. Here we present new bulk nitrogen (δ15Nbulk) and organic carbon (δ13Corg) isotope data from the Late ...
2 CitationsSource
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#1Neo E.B. McAdams (UI: University of Iowa)H-Index: 5
#2Bradley D. Cramer (UI: University of Iowa)H-Index: 15
Last.James E. Day (ISU: Illinois State University)H-Index: 7
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1 CitationsSource
#1Damien Pas (University of Liège)H-Index: 7
#2Linda A. Hinnov (GMU: George Mason University)H-Index: 35
Last.Wei Liu (China University of Geosciences)H-Index: 1
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Abstract The Late Devonian biosphere was affected by two of the most severe biodiversity crises in Earth's history, the Kellwasser and Hangenberg events near the Frasnian–Famennian (F–F) and the Devonian–Carboniferous (D–C) boundaries, respectively. Current hypotheses for the causes of the Late Devonian extinctions are focused on climate changes and associated ocean anoxia. Testing these hypotheses has been impeded by a lack of sufficient temporal resolution in paleobiological, tectonic and clim...
8 CitationsSource
#1Bradley D. CramerH-Index: 15
#2Alyssa M. BancroftH-Index: 3
Last.James E. DayH-Index: 7
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#1Neo E.B. McAdamsH-Index: 5
#2Bradley D. CramerH-Index: 15
Last.James E. DayH-Index: 7
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#2Bradley D. CramerH-Index: 15
Last.Brian J. WitzkeH-Index: 20
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#1Poul EmsboH-Index: 18
#2Wayne R. PremoH-Index: 19
Last.Alyssa M. BancroftH-Index: 3
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Times of metal-rich brine discharge into ancient ocean basins, associated with the formation of sedimentary-exhalative (sedex) Zn-Pb-Ba ore deposits, coincided with short-duration positive excursions ("spikes") in the global marine Sr isotope record. While these spikes are unexplained by conventional oceanic models, chronostratigraphic correlations, combined with mass balance evidence and oceanographic modeling, suggest that the flux of radiogenic Sr from sedex brines during ore formation is suf...
2 CitationsSource
Last.Bradley D. CramerH-Index: 15
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