Deccan volcanism induced high-stress environment during the Cretaceous-Paleogene transition at Zumaia, Spain: Evidence from magnetic, mineralogical and biostratigraphic records - Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie Accéder directement au contenu
Article Dans Une Revue Earth and Planetary Science Letters Année : 2018

Deccan volcanism induced high-stress environment during the Cretaceous-Paleogene transition at Zumaia, Spain: Evidence from magnetic, mineralogical and biostratigraphic records

Eric Font
Mariana Andrade
Gerta Keller
  • Fonction : Auteur
André Mbabi Bitchong
  • Fonction : Auteur
Joana Ferreira
Zenaida Diogo
Thierry Adatte

Résumé

We conducted detailed rock magnetic, mineralogical and geochemical (mercury) analyses spanning the Cretaceous-Paleogene boundary (KPB) at Zumaia, Spain, to unravel the signature of Deccan-induced climate and environmental changes in the marine sedimentary record. Our biostratigraphic results show that Zumaia is not complete, and lacks the typical boundary clay, zone P0 and the base of zone P1a(1) in the basal Danian. Presence of an unusual ~1m-thick interval spanning the KPB is characterized by very low detrital magnetite and magnetosome (biogenic magnetite) contents and by the occurrence of akaganéite, a very rare mineral on Earth in oxidizing, acidic and hyper-chlorinated environments compatible with volcanic settings. These benchmarks correlate with higher abundance of the opportunist Guembelitria cretacea species. Detrital magnetite depletion is not linked to significant lithological changes, suggesting that iron oxide dissolution by acidification is the most probable explanation.
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hal-03884656 , version 1 (05-12-2022)

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Eric Font, Mariana Andrade, Gerta Keller, André Mbabi Bitchong, Claire Carvallo, et al.. Deccan volcanism induced high-stress environment during the Cretaceous-Paleogene transition at Zumaia, Spain: Evidence from magnetic, mineralogical and biostratigraphic records. Earth and Planetary Science Letters, 2018, 484, pp.53-66. ⟨10.1016/j.epsl.2017.11.055⟩. ⟨hal-03884656⟩
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