Frequent Millennial‐Scale Oceanic Redox Oscillations Recorded by Negative Pyrite Δ33S: Implications for Phanerozoic Extinctions DOI Creative Commons
Xiaoxiao Yu, Mang Lin

Geophysical Research Letters, Год журнала: 2025, Номер 52(9)

Опубликована: Апрель 30, 2025

Abstract Phanerozoic extinctions may have been influenced by oceanic redox oscillations, as indicated mixing‐induced negative pyrite Δ 33 S (Δ py ). However, the frequencies, intensities, and timescales of these oscillations remain elusive. Here, we measured stratigraphic from currently anoxic Cariaco Basin, spanning ∼0.6 million years. Our results reveal two distinct patterns that are linked to specific potentially analogous recorded during extinctions. During Marine Isotope Stage 1–2 9–10, bottom water experienced on a timescale 10,000 years, resulting in slightly (−0.03‰). In contrast, period 160–200 kyr BP, underwent frequent millennial‐ centennial‐timescales, leading significantly more values (−0.09‰). We highlight similarly fluctuations contributed end‐Guadalupian extinction, when notably akin those observed our study were prevalent.

Язык: Английский

Frequent Millennial‐Scale Oceanic Redox Oscillations Recorded by Negative Pyrite Δ33S: Implications for Phanerozoic Extinctions DOI Creative Commons
Xiaoxiao Yu, Mang Lin

Geophysical Research Letters, Год журнала: 2025, Номер 52(9)

Опубликована: Апрель 30, 2025

Abstract Phanerozoic extinctions may have been influenced by oceanic redox oscillations, as indicated mixing‐induced negative pyrite Δ 33 S (Δ py ). However, the frequencies, intensities, and timescales of these oscillations remain elusive. Here, we measured stratigraphic from currently anoxic Cariaco Basin, spanning ∼0.6 million years. Our results reveal two distinct patterns that are linked to specific potentially analogous recorded during extinctions. During Marine Isotope Stage 1–2 9–10, bottom water experienced on a timescale 10,000 years, resulting in slightly (−0.03‰). In contrast, period 160–200 kyr BP, underwent frequent millennial‐ centennial‐timescales, leading significantly more values (−0.09‰). We highlight similarly fluctuations contributed end‐Guadalupian extinction, when notably akin those observed our study were prevalent.

Язык: Английский

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