TY - JOUR
T1 - A 20-million-year reconstruction to decipher the enigmatic Cambrian extinction – Ordovician biodiversification transition
AU - Bian, Leibo
AU - Chappaz, Anthony
AU - Schovsbo, Niels H.
AU - Wang, Xiaomei
AU - Zhao, Wenzhi
AU - Sanei, Hamed
N1 - Publisher Copyright:
© 2023 The Author(s)
PY - 2023/6/15
Y1 - 2023/6/15
N2 - The late Cambrian extinction – Early Ordovician biodiversification represents one of the crucial lower Paleozoic biological changes. However, the mechanisms responsible for this transition remain poorly understood. Here, we reconstructed the paleoenvironmental changes based on a model that integrated the atmospheric-oceanic-biological inputs and provided the first detailed assessment of the Cambro-Ordovician biological turnover. The results show depositional environments evolved into extremely sulfidic conditions with lower nutrient inputs and more restricted water circulation from the Miaolingian to early Furongian, leading to the Steptoean Positive Carbon Isotope Excursion event. The intense volcanic activity in the early Jiangshanian appears to be responsible for the recurrent bio-calamity. Later in the mid-late Furongian (mid-Jiangshanian to Stage 10), enhanced terrestrial weathering contributed to the Earth's cooling and higher inputs of terrestrial nutrients, beneficial to the subsequent biological recovery. In the Early Ordovician and despite reduced terrestrial nutrient input, massive oceanic water upwelling alleviated sulfidic conditions and brought nutrients, laying the foundation for the Great Ordovician Biodiversification Event.
AB - The late Cambrian extinction – Early Ordovician biodiversification represents one of the crucial lower Paleozoic biological changes. However, the mechanisms responsible for this transition remain poorly understood. Here, we reconstructed the paleoenvironmental changes based on a model that integrated the atmospheric-oceanic-biological inputs and provided the first detailed assessment of the Cambro-Ordovician biological turnover. The results show depositional environments evolved into extremely sulfidic conditions with lower nutrient inputs and more restricted water circulation from the Miaolingian to early Furongian, leading to the Steptoean Positive Carbon Isotope Excursion event. The intense volcanic activity in the early Jiangshanian appears to be responsible for the recurrent bio-calamity. Later in the mid-late Furongian (mid-Jiangshanian to Stage 10), enhanced terrestrial weathering contributed to the Earth's cooling and higher inputs of terrestrial nutrients, beneficial to the subsequent biological recovery. In the Early Ordovician and despite reduced terrestrial nutrient input, massive oceanic water upwelling alleviated sulfidic conditions and brought nutrients, laying the foundation for the Great Ordovician Biodiversification Event.
KW - Baltoscandian Basin
KW - Cambro-Ordovician
KW - paleo environmental reconstruction
KW - redox condition dynamics
KW - water circulation
UR - http://www.scopus.com/inward/record.url?scp=85153390286&partnerID=8YFLogxK
U2 - 10.1016/j.epsl.2023.118170
DO - 10.1016/j.epsl.2023.118170
M3 - Article
AN - SCOPUS:85153390286
SN - 0012-821X
VL - 612
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
M1 - 118170
ER -