Origin of ooidal ironstones in relation to warming events: Cretaceous-Eocene Bakchar deposit, south-east Western Siberia
作者： Maxim Rudmin , Aleksey Mazurov , Santanu Banerjee
DOI: 10.1016/J.MARPETGEO.2018.11.023
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摘要: Abstract An integrated study involving petrographical, mineralogical and geochemical investigations proposes the origin of Bakchar ironstone deposit by upward migration a mixture Fe-rich brine hydrothermal fluid through marine sediments. Trace element concentrations deposits rule out continental derivation Fe, while high REE indicate mixed hydrogeneous source. Three main types within are characterized distinct assemblage authigenic minerals corresponding to oxic, methanic weakly sulfidic dysoxic conditions. Changing redox conditions depositional environment, methane seepage in warm seawater availability iron influx possibly determined final mineralogy three varieties ironstones. The association siderite with ferrimagnetic sulfides like greigite pyrrhotite type-1 ore anaerobic oxidation limited bacterial sulfate reduction. Narym, Kolpashevo contemporaneous geological events ocean anoxic event 3 (OAE-3), Cretaceous-Paleogene (K-Pg) boundary Palaeocene-Eocene Thermal Maximum (PETM), respectively, all
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