Dataset Information

In-situ δ¹⁸O and ⁸⁷Sr/⁸⁶Sr proxies in an unconformable clastic unit at the Ordovician-Silurian transition.

ABSTRACT: Clastic successions found in the carbonate platform of continental margin during the Ordovician-Silurian Transition (OST) period are archives for interpreting paleo-depositional systems. Here, we report in-situ δ¹⁸O_quartz and ⁸⁷Sr/⁸⁶Sr_carbonate isotope chemo-stratigraphy for an unconformable clastic unit from the Cathaysia terrane that rifted off the Gondwana Supercontinent in the Early Paleozoic Era. Our results suggest a depositional proxy and model for geological events attributed to rapid changes in the sedimentary environment during the OST period. Importantly, these results present crucial clues that infer the influence of Paleo-Tethys Sea opening, global eustatic regression, and rapid sedimentary provenance change. Our study provides insight into paleo-tracer that could be a key method for interpreting depositional system of carbonate platform based on in-situ mineral isotope chemo-stratigraphy that preserves the original value of provenance and geochemical condition.

SUBMITTER: Park C

PROVIDER: S-EPMC10499834 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature

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Publications

In-situ δ18O and 87Sr/86Sr proxies in an unconformable clastic unit at the Ordovician-Silurian transition.

Park Chaewon C Song Yungoo Y Kim Namsoo N Choi Sung-Ja SJ Chwae Ueechan U Jang Yirang Y Kwon Sanghoon S Kim Jeongmin J Kim Ha H Jeong Youn-Joong YJ

Scientific reports 20230913 1

Clastic successions found in the carbonate platform of continental margin during the Ordovician-Silurian Transition (OST) period are archives for interpreting paleo-depositional systems. Here, we report in-situ δ18Oquartz and 87Sr/86Srcarbonate isotope chemo-stratigraphy for an unconformable clastic unit from the Cathaysia terrane that rifted off the Gondwana Supercontinent in the Early Paleozoic Era. Our results suggest a depositional proxy ...[more]

PMID: 37704744

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Project description:Symbioses between metazoans and microbes involved in sulfur cycling are integral to the ability of animals to thrive within deep-sea hydrothermal vent environments; the development of such interactions is regarded as a key adaptation in enabling animals to successfully colonize vents. Microbes often colonize the surfaces of vent animals and, remarkably, these associations can also be observed intricately preserved by pyrite in the fossil record of vent environments, stretching back to the lower Paleozoic (Ordovician-early Silurian). In non-vent environments, sulfur isotopes are often employed to investigate the metabolic strategies of both modern and fossil organisms, as certain metabolic pathways of microbes, notably sulfate reduction, can produce large sulfur isotope fractionations. However, the sulfur isotopes of vent fossils, both ancient and recently mineralized, have seldom been explored, and it is not known if the pyrite-preserved vent organisms might also preserve potential signatures of their metabolisms. Here, we use high-resolution secondary ion mass spectrometry (SIMS) to investigate the sulfur isotopes of pyrites from recently mineralized and Ordovician-early Silurian tubeworm fossils with associated microbial fossils. Our results demonstrate that pyrites containing microbial fossils consistently have significantly more negative δ34 S values compared with nearby non-fossiliferous pyrites, and thus represent the first indication that the presence of microbial sulfur-cycling communities active at the time of pyrite formation influenced the sulfur isotope signatures of pyrite at hydrothermal vents. The observed depletions in δ34 S are generally small in magnitude and are perhaps best explained by sulfur isotope fractionation through a combination of sulfur-cycling processes carried out by vent microbes. These results highlight the potential for using sulfur isotopes to explore biological functional relationships within fossil vent communities, and to enhance understanding of how microbial and animal life has co-evolved to colonize vents throughout geological time.

Dataset Information

In-situ δ¹⁸O and ⁸⁷Sr/⁸⁶Sr proxies in an unconformable clastic unit at the Ordovician-Silurian transition.

Publications

In-situ δ<sup>18</sup>O and <sup>87</sup>Sr/<sup>86</sup>Sr proxies in an unconformable clastic unit at the Ordovician-Silurian transition.

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