Minerals, Journal Year: 2025, Volume and Issue: 15(4), P. 366 - 366

Published: March 31, 2025

The interglacial period of the Cryogenian glaciation is a pivotal interval in geological history, marked by two “Snowball Earth” events and emergence early animals. Currently, there considerable debate regarding paleo-oceanic environment dominant factors controlling organic matter enrichment. Here, based on inorganic geochemical data mineral composition from Datangpo Formation Xiangtan (South China), combined with previous research, we have analyzed paleo-climate, redox condition, seawater restriction, primary productivity across different sedimentary facies during this critical interval. results exhibit that can be divided into three members (Da1–Da3) lithology. Paleoclimatic proxies suggest was relatively cold deposition Da-1 Member, while it warm humid Da 2–3 members. Compared to shallow water areas, deep-water areas experienced more rapid transition paleotemperature following Sturtian event. Combining Mo-U elements, CeN/Ce*N, Corg/P ratios, characterized an oxic Formation, then gradually transitioned suboxic, finally anoxic conditions. Furthermore, decompression terrestrial magma chambers led intense volcanic/hydrothermal activity deglaciation period. Hydrothermal most depositional period, followed Da-2, declined Da-3 not only provided essential materials for formation Mn carbonate ores but also significantly enhanced introducing large amounts nutrients paleo-ocean. indicators (Ni/Al, Cu/Al) exhibited obvious coupling CeN/Ce*N ratios indicating oxygen-rich environments were favorable biological proliferation, thereby providing abundant matter. Anoxic conditions further facilitated preservation matter, which may factor driving enrichment Formation.

Language: Английский