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Minerals, Volume 14, Issue 10
October 2024 - 99 articles
Cover Story: Proterozoic diagenetic spheroids consist of concretions, nodules, botryoids, granules, and rosettes. Although these mineralised spheroidal structures are common in the sedimentological record, a consensus has yet to be reached regarding their formation mechanism. This study collates the occurrences of diagenetic spheroids between 0.541 and 1.8 Ga to investigate whether there are differences in abundances during stable environmental conditions and enhanced influxes of atmospheric oxygen. Circularly concentric patterns were typically observed in Proterozoic diagenetic spheroids, similar to geometric patterns formed under chemically oscillating reactions. The graphical abstract shows our collated timeline, the mineral concentricity from the 632 Ma Doushantuo Fm, and chert nodules from the 1560 to 1577 Ma Gaoyuzhuang Fm. View this paper
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Minerals - ISSN 2075-163X