Rare earth elements in the phosphatic-enriched sediment of the Peru shelf
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Diagenetic Barite-Pyrite-Wurtzite Formation and Redox Signatures in Triassic Mudstone, Brooks Range, Northern Alaska
2021, Chemical GeologyCitation Excerpt :Third, although redox cycling is common in many stratified marine basins, including significant transport of Mn-Fe-P by the shelf-to-basin shuttle process (e.g., Dellwig et al., 2010), we consider this mechanism unlikely for the Otuk Formation given the very low contents of Mn (<0.1 wt% MnO) and P (≤0.20 wt% P2O5) in all but one analyzed black mudstone sample (927–1778 has 0.19 wt% MnO), and on the absence of a significant correlation between P2O5 and Ce/Ce* (R2 = 0.27). It is also noteworthy that phosphate-poor sediments of modern upwelling zones lack moderate or large negative PAAS-normalized Ce anomalies, based on data from offshore Peru (Ce/Ce* ≥0.79; Piper et al., 1988) and Namibia (Ce/Ce* ≥0.72; Orani et al., 2019). Relevant to the fourth possibility is the absence of a correlation in our Otuk samples of U vs. Ce/Ce* (R2 = 0.08), suggesting that the inferred loss of U in most of these samples, attributed above to bioturbation, is decoupled from the low Ce/Ce* values reported here.
Enrichment of rare earth elements in the early Cambrian Zhijin phosphorite deposit, SW China: Evidence from francolite micro-petrography and geochemistry
2021, Ore Geology ReviewsCitation Excerpt :The contents of rare earth elements (REEs) in global phosphorites exceed those of most known REE deposits, meaning that the utilization of associated REE resources in phosphorite deposits has recently attracted more attention (Radhika et al., 2011; Emsbo et al., 2015). It is generally considered that REEs enter apatite during the earliest stage of diagenesis, thus faithfully recording the REE composition of seawater at the time of deposition (Elderfield and Pagett, 1986; Wright et al., 1987; Piper et al., 1988; Picard et al., 2002; Lécuyer et al., 2004; Martin and Scher, 2004), with many studies interpreting normalized REE patterns similar to those of modern seawater as major elements (Elderfield and Pagett, 1986; Wright et al., 1987; Piper et al., 1988; Picard et al., 2002; Martin and Scher, 2004). Variation in REE abundance in phosphorite is attributed mainly to lithofacies, grain size, burial time, and burial depth (McArthur and Walsh, 1984; Ilyin, 1998; Shields and Stille, 2001; Shields and Webb, 2004).
Diagenetic evolution of the upper Devonian phosphorites, Alborz Mountain Range, northern Iran
2018, Sedimentary GeologyMore reducing bottom-water redox conditions during the Last Glacial Maximum in the southern Challenger Deep (Mariana Trench, western Pacific) driven by enhanced productivity
2018, Deep-Sea Research Part II: Topical Studies in Oceanography