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ooidal ironstones in the Meso-Cenozoic sequences in western Siberia: assessment of formation processes and relationship with regional and global earth processes

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Journal of Palaeogeography 2020年第1期9卷 88-108页

作者： Maxim Rudmin Santanu Banerjee Elshan Abdullayev Aleksey Ruban Ekaterina Filimonenko Elena Lyapina Roman Kashapov Aleksey Mazurov Division for Geology School of Earth Sciences and EngineeringTomsk Polytechnic University634050 TomskRussia Department of Earth Sciences Indian Institute of Technology BombayPowaiMumbai 400076MaharashtraIndia Department of Geoscience French-Azerbaijani University(UFAZ)AZ1000 BakuAzerbaijan Institute of Monitoring of Climatic and Ecological System of SB of RAS 634055 TomskRussia.

This study investigates the process of formation of ooidal ironstones in the Upper Cretaceous-Paleogene succession in western *** formation of such carbonate-based ironstones is a continuing problem in sedimentary geology,and in this study,we use a variety of data and proxies assembled from core samples to develop a model to explain how the ooidal ironstones *** on pyrite framboids and geochemical redox proxies reveals three intervals of oceanic hypoxia during the deposition of marine ooidal ironstones in the Late Cretaceous to the Early Paleogene Bakchar ironstone deposit in western Siberia;the absence of pyrite indicates oxic conditions for the remaining *** goethite formed in oxic depositional condition,chamosite,pyrite and siderite represented hypoxic *** pyrite crystals form through a series of transition originating from massive aggregate followed by normal and polygonal *** associated with goethite-chamosite ironstones,encompassing hypoxic intervals exhibit positive cerium,negative europium,and negative yttrium *** anomalies,associated with the initial stages of hypoxia,correlate with global volcanic *** sensitive proxies and ore mineral assemblages of deposits reflect hydrothermal *** and global volcanism possibly induced hydrothermal convection in the sedimentary cover of western Siberia,and released iron-rich fluid and methane in coastal and shallow marine *** investigation,therefore,reveals a potential geological connection between Large Igneous Provinces(LIPs),marine hypoxia,rifting and the formation of ooidal ironstones in ancient West Siberian Sea.

关键词： ooidal ironstone Pyrite framboids Late Cretaceous Early Paleogene Western Siberia Bakchar ironstone deposit Redox conditions

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