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

Chaewon Park; Yungoo Song; Namsoo Kim; Sung-Ja Choi; Ueechan Chwae; Yirang Jang; Sanghoon Kwon; Jeongmin Kim; Ha Kim; Youn-Joong Jeong

doi:10.1038/s41598-023-42200-3

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

Sci Rep. 2023 Sep 13;13(1):15174. doi: 10.1038/s41598-023-42200-3.

Authors

Affiliations

¹ Department of Earth System Sciences, Yonsei University, Seoul, Republic of Korea.
² Department of Earth System Sciences, Yonsei University, Seoul, Republic of Korea. yungoo@yonsei.ac.kr.
³ Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, Republic of Korea.
⁴ Department of Earth and Environmental Sciences, Chonnam National University, Gwangju, Republic of Korea.
⁵ Korea Basic Science Institute (KBSI), Cheongju, Republic of Korea.

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.