- 1CNU G-Lamp, Chonnam National University, College of Natural Science, Department of Earth and Environmental Sciences, Korea, Republic of (abhisikta002@gmail.com)
- 2Department of Geological and Environmental Sciences, Chonnam National University, Gwangju 681186, Republic of Korea
- 3Department of Earth System Sciences, Yonsei University, Seoul 03722, Republic of Korea
Paleoproterozoic cap carbonates provide vital records of post-glacial environmental and biogeochemical transitions, offering crucial insights into early Earth’s climatic, ocean–atmosphere evolution, and the planet’s habitability[1]. This study reports, for the first time, well-preserved evidence of such cap carbonates from the Aravalli Supergroup, India, identified within calc-silicate horizons embedded in the metavolcanics of the Delwara Formation. Comprehensive geochemical and isotopic analyses confirm their primary depositional signatures and effectively rule out major diagenetic or metamorphic overprinting. The systematically collected samples exhibit negative δ13CV-PDB values, characteristic of global cap-carbonate sequences that formed immediately after the Paleoproterozoic glaciation. These strata are subsequently overlain by dolomites displaying the pronounced positive δ13CV-PDB excursion associated with the Lomagundi–Jatuli Event (LJE). Unlike the Sausar Group of India, which records cap carbonates without evidence of the LJE, the Aravalli Supergroup uniquely preserves both features within its Paleoproteozoic succession[2]. This integrated record establishes the Aravalli Basin as a key site for understanding the temporal link between deglaciation, large-scale carbon-cycle shifts, and atmospheric oxygenation. Furthermore, the coexistence of post-glacial and LJE signatures enables refined global chemostratigraphic correlations with other Paleoproterozoic basins across continents such as South Africa, Canada, and Australia[3]. These findings highlight the Aravalli Basin’s pivotal role in tracing the aftermath of Paleoproterozoic glaciations and provide new perspectives on how early Earth’s surface environments evolved during one of the most transformative intervals in the planet’s history.
References
[1] Bekker et al. [2005]. Precamb Res. 137(3-4), 167-206.
[2] Goswami et al. [2023]. Precamb Res. 399.
[3] Maheshwari et al. [2010]. Gondwana Res. 417, 195-209.
How to cite: Goswami, A., Jang, Y., and Kwon, S.: When Ice Met Oxygen: Unveiling the Oldest Clues of Earth’s Climate Shift from the Aravalli Supergroup, India. , EGU General Assembly 2026, Vienna, Austria, 3–8 May 2026, EGU26-2953, https://doi.org/10.5194/egusphere-egu26-2953, 2026.
