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Early Late Permian coupled carbon and strontium isotope chemostratigraphy from South China: Extended Emeishan volcanism?


Bagherpour, Borhan; Bucher, Hugo; Schneebeli-Hermann, Elke; Vennemann, Torsten; Chiaradia, Massimo; Shen, Shu-zhong (2018). Early Late Permian coupled carbon and strontium isotope chemostratigraphy from South China: Extended Emeishan volcanism? Gondwana research, 58:58-70.

Abstract

Carbon isotope compositions of carbonates (δ13Ccarb) document a new 3.5‰ CIE toward lower values concomitant with an Emeishan Large Igneous Province (ELIP)-related drowning event (Mapojiao Event, southern Guizhou) during the early Wuchiapingian. Organic carbon isotope data (δ13Corg) have a 2‰ shift toward higher values across the drowning event, showing decoupling with the δ13Ccarb evolution. Rock-Eval and palynofacies analyses suggest an elevated flux of terrestrial organic matter (OM) during the drowning episode. Therefore, the decoupling between δ13Ccarb and δ13Corg is best explained by the mixing of different organic carbon pools in the δ13Corg curve. Strontium isotope data (87Sr/86Sr) also show a transient shift from 0.70715 to 0.70694 associated with this early Wuchiapingian carbon isotope excursion (CIE), which is superimposed on the late Permian prolonged global rising trend. This short-lived 87Sr/86Sr excursion is best interpreted as an enhanced hydrothermal flux related to a short pulse of ELIP-related volcanism.

Abstract

Carbon isotope compositions of carbonates (δ13Ccarb) document a new 3.5‰ CIE toward lower values concomitant with an Emeishan Large Igneous Province (ELIP)-related drowning event (Mapojiao Event, southern Guizhou) during the early Wuchiapingian. Organic carbon isotope data (δ13Corg) have a 2‰ shift toward higher values across the drowning event, showing decoupling with the δ13Ccarb evolution. Rock-Eval and palynofacies analyses suggest an elevated flux of terrestrial organic matter (OM) during the drowning episode. Therefore, the decoupling between δ13Ccarb and δ13Corg is best explained by the mixing of different organic carbon pools in the δ13Corg curve. Strontium isotope data (87Sr/86Sr) also show a transient shift from 0.70715 to 0.70694 associated with this early Wuchiapingian carbon isotope excursion (CIE), which is superimposed on the late Permian prolonged global rising trend. This short-lived 87Sr/86Sr excursion is best interpreted as an enhanced hydrothermal flux related to a short pulse of ELIP-related volcanism.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Paleontological Institute and Museum
Dewey Decimal Classification:560 Fossils & prehistoric life
Language:English
Date:2018
Deposited On:19 Apr 2018 11:43
Last Modified:24 Sep 2019 23:27
Publisher:Elsevier
ISSN:1342-937X
OA Status:Closed
Publisher DOI:https://doi.org/10.1016/j.gr.2018.01.011
Project Information:
  • : FunderSNSF
  • : Grant ID200020_160055
  • : Project TitleMid-Early Triassic Extreme Climatic Oscillation (METECO): biotic-abiotic global couplings
  • : FunderSNSF
  • : Grant ID200021_135446
  • : Project TitleThe onset of the Early Triassic biotic recovery

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