Origin of ooidal ironstones in relation to warming events: Cretaceous-Eocene Bakchar deposit, south-east Western Siberia; Marine and Petroleum Geology; Vol. 100

Origin of ooidal ironstones in relation to warming events: Cretaceous-Eocene Bakchar deposit, south-east Western Siberia; Marine and Petroleum Geology; Vol. 100

Dettagli Bibliografici
Parent link:	Marine and Petroleum Geology Vol. 100.— 2019.— [P. 309-325]
Ente Autore:	Национальный исследовательский Томский политехнический университет Инженерная школа природных ресурсов Отделение геологии
Altri autori:	Rudmin M. A. Maksim Andreevich, Mazurov A. K. Aleksey Karpovich, Banerjee S. Santanu
Riassunto:	Title screen An integrated study involving petrographical, mineralogical and geochemical investigations proposes the origin of the Bakchar ironstone deposit by upward migration of a mixture of Fe-rich brine and hydrothermal fluid through marine sediments. Trace element concentrations of the ironstone deposits rule out continental derivation of Fe, while high REE concentrations indicate mixed hydrogeneous and hydrothermal source. Three main types of ironstone within the Bakchar deposit are characterized by distinct mineralogical assemblage of authigenic minerals corresponding to oxic, methanic and weakly sulfidic dysoxic conditions. Changing redox conditions of the depositional environment, methane seepage in warm seawater and availability of iron influx possibly determined the final mineralogy of three varieties of ironstones. The association of siderite with ferrimagnetic sulfides like greigite and pyrrhotite in type-1 ore indicate anaerobic oxidation of methane with limited bacterial sulfate reduction. The ironstone deposits of Narym, Kolpashevo and Bakchar are contemporaneous with geological events like ocean anoxic event 3 (OAE-3), Cretaceous-Paleogene (K-Pg) boundary and Palaeocene-Eocene Thermal Maximum (PETM), respectively, all corresponding to warm seawater conditions. Режим доступа: по договору с организацией-держателем ресурса
Lingua:	inglese
Pubblicazione:	2019
Soggetti:	электронный ресурс труды учёных ТПУ Бакчар геохимия минералогия Западная Сибирь
Accesso online:	https://doi.org/10.1016/j.marpetgeo.2018.11.023
Natura:	Elettronico Capitolo di libro
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=658829

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