Genesis and paleoenvironmental analysis of the ironstone facies of the Maastrichtian Patti Formation, Bida Basin, Nigeria
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DOI: 10.1016/j.jafrearsci.2020.104058
Abstract: Abstract The recently constructed Lokoja-Abuja highway and a quarry which cut through the Patti Formation, provided opportunity for the field study and sampling of the exposed ironstone interbeds within the carbonaceous shales and clays in… read more here.
Keywords: ironstone; basin nigeria; ironstone facies; bida basin ... See more keywords
Early to Middle Devonian ironstone and phosphorite in the northwestern Gondwana Parnaíba Basin, Brazil: A record of an epeiric margin paleoceanographic changes
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DOI: 10.1016/j.sedgeo.2020.105646
Abstract: Abstract Pragian to Givetian successions in the Caninde group, Parnaiba Basin (Brazil), present phosphorites, ironstone and organic rich sediments that globally coincide with greenhouse conditions and an increase in continental weathering, ocean oxygen levels and… read more here.
Keywords: gondwana; ironstone; margin; basin brazil ... See more keywords
Polygenic chamosite from a hydrothermalized oolitic ironstone (Saint-Aubin-des-Châteaux, Armorican Massif, France): crystal chemistry, visible–near-infrared spectroscopy (red variety) and geochemical significance
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DOI: 10.1180/clm.2020.13
Abstract: Abstract Several generations of chamosite, including a red variety, occur in the Ordovician hydrothermalized oolitic ironstone from Saint-Aubin-des-Châteaux (Armorican Massif, France). Their chemical re-examination indicates a low Mg content (0.925 < Fe/(Fe + Mg) <… read more here.
Keywords: chamosite; red variety; chemistry; ironstone ... See more keywords