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Environmental changes occurred during the Early Danian at the Rio Grande Rise, South Atlantic Ocean
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.gloplacha.2020.103197
Guilherme Krahl , Marlone H.H. Bom , Karlos G.D. Kochhann , Laís V. Souza , Jairo F. Savian , Gerson Fauth

Abstract Early Danian environmental perturbations related to carbon isotope negative excursions (CIEs) were recognized at Deep Sea Drilling Project (DSDP) Hole 516F, Rio Grande Rise. Within the first ~160 kyr of the Danian, environmental stability is evidenced by well‑oxygenated bottom waters, good carbonate preservation, and relatively high primary production. The preservation of carbonates and the oxygenation of the deep water decreased progressively, leading to the formation of red layers in the sediments between 65.86 Ma and 65.71 Ma. The onset of carbonate dissolution and the reduction in dissolved oxygen concentrations occurred approximately 50 kyr before the onset of the Dan-C2 event, and was probably related to the third volcanic event of the Deccan Traps (DT). Our results support the link between enhanced emissions of volcanic gasses and deep ocean carbonate dissolution and deoxygenation during the Early Danian. The CIEs at the Rio Grande Rise are positioned within the planktonic foraminiferal biozone P1b, suggesting that the first appearance of Subbotina triloculinoides within Chron C29r (at 65.89 Ma) is a diachronous datum.
更新日期:2020-08-01
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