Sulfur isotope change across the Early Mississippian K–O (Kinderhookian–Osagean) δ13C excursion

Maharjan, Dev; Jiang, Ganqing; Peng, Yongbo; Nicholl, Michael J.

doi:10.1016/j.epsl.2018.04.043

Cited by 14 publications

(4 citation statements)

References 56 publications

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“…This temporal coincidence supports the hypothesis that enhanced OC burial was driven by expanded ocean anoxia, which drove the positive δ 13 C shift. In contrast to previous studies using local redox proxies (δ 15 N- Yao et al, 2015;Maharjan et al, 2018a; δ 34 S CAS - Maharjan et al, 2018b), these results provide the first evidence from a globally integrated seawater redox proxy, and they provide clear evidence that Early Mississippian cooling and glaciation, as evidenced by the coeval positive δ 18 O apatite shift (Mii et al, 1999;Buggisch et al, 2008), were controlled by an anoxia-driven OC burial event.…”

Section: Discussioncontrasting

confidence: 86%

“…TICE magnitudes from Europe and Russia range from 4‰ to 6‰ (Saltzman et al, 2004). The δ 18 O trends from Tournaisian apatite, calcite, and carbonate-associated sulfate indicate a positive ∼1‰-2‰ shift concurrent with the TICE, indicating seawater cooled as OC was buried (Mii et al, 1999;Buggisch et al, 2008;Maharjan et al, 2018b). Previous studies using δ 15 N (Yao et al, 2015;Maharjan et al, 2018a) and δ 34 S CAS (CAS-carbonateassociated sulfate) (Gill et al, 2007;Maharjan et al, 2018b) to evaluate Tournaisian seawater redox reported mixed results between adjacent sections, leaving the question of global redox conditions unanswered.…”

Section: Introductionmentioning

confidence: 99%

“…1; GPS coordinates 37°23'39.1"N, 115°15'42.1"W), where previous conodont biostratigraphy and δ 13 C studies provide a robust temporal framework and indicate that the ∼250-m-thick succession spans ∼4 m.y. (Saltzman, 2002;Maharjan et al, 2018aMaharjan et al, , 2018b. Detailed paleogeographic, stratigraphic, and biostratigraphic background, and our methods, are provided in the GSA Data Repository 1 .…”

Section: Introductionmentioning

confidence: 99%

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Early Mississippian ocean anoxia triggered organic carbon burial and late Paleozoic cooling: Evidence from uranium isotopes recorded in marine limestone

Cheng

Elrick

Romaniello

2020

Geology

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The Early Mississippian (Tournaisian) positive δ13C excursion (mid-Tournaisian carbon isotope excursion [TICE]) was one of the largest in the Phanerozoic, and the organic carbon (OC) burial associated with its development is hypothesized to have enhanced late Paleozoic cooling and glaciation. We tested the hypothesis that expanded ocean anoxia drove widespread OC burial using uranium isotopes (δ238U) of Lower Mississippian marine limestone as a global seawater redox proxy. The δ238U trends record a large Tournaisian negative excursion lasting ∼1 m.y. The lack of covariation between δ238U values and facies changes and proxies for local depositional and diagenetic influences suggests that the δ238U trends represent a global seawater redox signal. The negative δ238U excursion is coincident with the first TICE positive excursion, supporting the hypothesis that an expanded ocean anoxic event controlled OC burial. These results provide the first evidence from a global seawater redox proxy that an ocean anoxic event drove Tournaisian OC burial and controlled Early Mississippian cooling and glaciation. Uranium and carbon modeling results indicate that (1) there was an ∼6× increase in euxinic seafloor area, (2) OC burial was initially driven by expanded euxinia followed by expanded anoxic/suboxic conditions, and (3) OC burial mass was ∼4–17× larger than that sequestered during other major ocean anoxic events.

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Section: Discussioncontrasting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early Mississippian ocean anoxia triggered organic carbon burial and late Paleozoic cooling: Evidence from uranium isotopes recorded in marine limestone

Cheng

Elrick

Romaniello

2020

Geology

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“…Widespread anoxia occurred during the mid-Tournaisian, evidenced by the paired positive shifts in carbon and sulfur isotopes and black shale deposits (e.g. Lower Alum Shale Event in southern Laurussia continent) during this time (Aretz, 2016;Maharjana et al, 2018b;Fig. 10).…”

Section: Controlling Factorsmentioning

confidence: 99%

The longest delay: Re-emergence of coral reef ecosystems after the Late Devonian extinctions

Yao

Aretz

Wignall

et al. 2020

Earth-Science Reviews

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Carboniferous integrative stratigraphy, biotas, and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

Hu,

Wang,

Wang

et al. 2024

Sci. China Earth Sci.

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Sulfur isotope change across the Early Mississippian K–O (Kinderhookian–Osagean) δ13C excursion

Cited by 14 publications

References 56 publications

Early Mississippian ocean anoxia triggered organic carbon burial and late Paleozoic cooling: Evidence from uranium isotopes recorded in marine limestone

Early Mississippian ocean anoxia triggered organic carbon burial and late Paleozoic cooling: Evidence from uranium isotopes recorded in marine limestone

The longest delay: Re-emergence of coral reef ecosystems after the Late Devonian extinctions

Carboniferous integrative stratigraphy, biotas, and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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