Abstract
The recovery time of marine productivity following the Cretaceous-Paleogene (KPg) mass extinction varies tremendously with location (hundreds to millions of years), with possible delays in the tropics as compared to higher latitudes. This heterogeneity is based on prevalent oligo- to mesotrophic marine environments. While highly productive eutrophic environments are less prevalent, they play a greater role in the carbon cycle. Here we present data from a eutrophic region within the tropical southern Tethys. Records of both organic matter and calcite production in this locality exhibit stability across the KPg boundary. In addition, our study points to a remarkably rapid recovery (<11 kyr), even possibly continuous high productivity across the KPg boundary, despite the tropical location. Moreover, the characteristic KPg δ13C negative excursion is observed in our locality, but is independent of high productivity, possibly indicating a reduction in the δ13C of the DIC of the ocean due to the input of light carbon from the atmosphere. Thus, this study provides new insight into the functioning of eutrophic ecosystems during environmental stress imposed by the ecological crisis.
Original language | American English |
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Article number | 103371 |
Journal | Global and Planetary Change |
Volume | 196 |
DOIs | |
State | Published - Jan 2021 |
Bibliographical note
Funding Information:Y.O.R and S.A.P acknowledge the support of the Israeli Ministry for Infrastructure, Energy and Water (grant # 217-17-008) and of the Israel Science Foundation (grant # 2456/19). NT acknowledges Carlsbergfondet CF16-0457 for support. SAP wishes to thank the Israeli Ministry of Science and Technology (MOST) for their continued support of the ADSSC. AA thanks the Israel Science Foundation (grant # 1738/16) for partial support of this study. We thank Ward Said-Ahmad, Alexander Meshoulam and Ravid Hagbi for their support of the technical work for the geochemical data and Leeron Ashkenazi for samples preparation for the micropaleontiology analysis. David K. Watkins (Department of Earth and Atmospheric Sciences) from the University of Nebraska-Lincoln, is acknowledged for providing feedback on biostratigraphy and the interpretation of the nannofossil vs. foraminifera data. We thank Thierry Adatte and an annonymous reviewer for their constructive and helpful comments on an early version of this manuscript.
Funding Information:
Y.O.R and S.A.P acknowledge the support of the Israeli Ministry for Infrastructure, Energy and Water (grant # 217-17-008 ) and of the Israel Science Foundation (grant # 2456/19 ). NT acknowledges Carlsbergfondet CF16-0457 for support. SAP wishes to thank the Israeli Ministry of Science and Technology (MOST) for their continued support of the ADSSC. AA thanks the Israel Science Foundation (grant # 1738/16 ) for partial support of this study. We thank Ward Said-Ahmad, Alexander Meshoulam and Ravid Hagbi for their support of the technical work for the geochemical data and Leeron Ashkenazi for samples preparation for the micropaleontiology analysis. David K. Watkins (Department of Earth and Atmospheric Sciences) from the University of Nebraska-Lincoln, is acknowledged for providing feedback on biostratigraphy and the interpretation of the nannofossil vs. foraminifera data. We thank Thierry Adatte and an annonymous reviewer for their constructive and helpful comments on an early version of this manuscript.
Publisher Copyright:
© 2020 Elsevier B.V.
Keywords
- Carbon isotopic excursion
- Cretaceous Paleogene mass extinction
- Primary and export productivity
- Recovery
- Upwelling ecosystem