Upper Cretaceous zonal stratigraphy of the West Siberian Plain based on foraminifera

Podobina, Vera M.; Kseneva, Tatyana G.

doi:10.1016/j.cretres.2004.11.006

Cited by 11 publications

(6 citation statements)

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“…1a). This Upper Cretaceous-Palaeogene iron ore deposit occurs in subsurface at depth ranging from 165 m to 230 m (Belous et al 1964;Podobina and Kseneva 2005;Lebedeva et al 2013Lebedeva et al , 2017. The ore-bearing strata in Bakchar deposited in transgressive coastal and shallow marine environments, attaining a maximum thickness of 80 m ( Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…Subsequently Pavlov (1989) has proposed the origin of West Siberian iron ore basin by considering spatial association of ironstone deposits with oil and gas deposits. A detailed core drilling has made it possible for extensive studies on the origin of the ironstone (Podobina and Kseneva 2005;Asochakova 2014;Rudmin et al 2014;Gnibidenko et al 2015;Rudmin and Mazurov 2016).…”

Section: Introductionmentioning

confidence: 99%

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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

Rudmin

Banerjee

Abdullayev³

et al. 2020

J. Palaeogeogr.

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This study investigates the process of formation of ooidal ironstones in the Upper Cretaceous-Paleogene succession in western Siberia. The 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 formed. Research 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 sequence. While goethite formed in oxic depositional condition, chamosite, pyrite and siderite represented hypoxic seawater. Euhedral pyrite crystals form through a series of transition originating from massive aggregate followed by normal and polygonal framboid. Sediments associated with goethite-chamosite ironstones, encompassing hypoxic intervals exhibit positive cerium, negative europium, and negative yttrium anomalies. Mercury anomalies, associated with the initial stages of hypoxia, correlate with global volcanic events. Redox sensitive proxies and ore mineral assemblages of deposits reflect hydrothermal activation. Rifting 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 environments. This 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.

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Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Rudmin

Banerjee

Abdullayev³

et al. 2020

J. Palaeogeogr.

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“…This deposit is located in the southeastern part of western Siberia (52 • 01 45 C; 82 • 07 20 B, Figure 1a), 200 km from Tomsk city to the north-west. Iron ore deposits occur at a depth of 157 to 230 m among Upper Cretaceous and Paleogene rocks [47][48][49][50][51][52][53]. The ore-bearing layers of the Bakchar deposit occur in a transgressive complex, where there was a marine-coastal and shallow environment.…”

Section: Upper Cretaceous-lower Paleogene Bakchar Depositmentioning

confidence: 99%

Minerals of Rare Earth Elements in High-Phosphorus Ooidal Ironstones of the Western Siberia and Turgai Depression

et al. 2019

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The aim of this research was to study the rare earth (REE) minerals in ooidal ironstone deposits of the West Siberian basin and the Turgai depression. Authigenic minerals (monazite and cerite) were described, and their main mineral form was identified as light rare earth element phosphate (LREE-phosphate) in this study. LREE-phosphate is included in ferruginous ooids, peloids, and oncoids and forms a consistent mineral association with Fe-hydroxides (goethite and its hydrated amorphous derivatives) and Fe-rich layered silicates (Fe-illite-smectite, chamosite, berthierine). The constancy of the mineral association in two deposits of different ages indicates a general mechanism behind the formation of these minerals. LREE-phosphates (authigenic monazite) are characterized by microscopic sizes (up to 24 μm), diverse morphology (mainly spherical or xenomorphic), and occupy spaces between the micro-cortex in ferruginous spheroids. This mineral can be found in other deposits of ooidal ironstone. According to its mineralogical and chemical characteristics, LREE-phosphate mainly belongs to the authigenic (nodular or “gray”) monazite. However, the incomplete (not 100%) correspondence of Kikuchi bands with the reference monazite does not allow its reliable identification. Based on its small size, chemical leaching or bacterial interaction is recommended to extract REE from ooidal ironstone while predicting the associated removal of phosphorus from iron ore due to its dominant phosphate mineral form. Ooidal ironstone should be considered a complex deposit and an unconventional natural type of REE ores as an example of the largest Bakchar and Lisakovsk deposits.

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“…Железные руды месторождения залегают на глубине от 157 до 230 м среди пород верхнемело вого и палеогенового возраста [1,2,[17][18][19][20][21]. Рудо носная толща Бакчарского месторождения пред ставляет собой трансгрессивный комплекс мор ских прибрежных и мелководных отложений мощностью около 80 м (рис.…”

Section: объект исследованияunclassified

Перспективы Комплексного Освоения Бакчарского Железорудного Месторождения (Западная Сибирь, Россия)

Rudmin¹,

Мазуров²,

Рева³

et al. 2018

IZVESTIYA

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Актуальность исследования. Приводится анализ и оценка комплексных ресурсов Бакчарского месторождения, которое до настоящего времени считалось исключительно железорудным месторождением морских оолитовых железняков. Изученные второстепенные минеральные продукты могут быть предметом добычи для первоочередной окупаемости объекта. Основная цель работы заключалась в качественной и количественной оценке потенциальных попутных минеральных компонентов Бакчарского месторождения. Использовались следующие аналитические методы: оптическая микроскопия и петрографический анализ, сканирующая электронная микроскопия, рентгенодифракционный анализ, рентгенофлуоресцентный анализ. В результате проведенных исследований получены следующие основные выводы. Ресурсы глауконита на месторождении составляют около 800 млн т. В пределах западного детально разведанного участка площадью 5 км2 ресурсы глауконита оцениваются в 34 млн т при среднем содержании 27,8 %, из которых 4,6 млн т составляют глауконитолиты, 18,1 млн т - глауконитовые песчаники и 11,3 млн т - глауконит-шамозит-гетитовые ооидовые железняки. Туронские песчанистые алевролиты ипатовской свиты обогащены магнетитом и ильменитом при их суммарном среднем содержании в породе 15,2 %. Наличие этих минералов обеспечивает высокий магнитный сигнал (магнитная восприимчивость) отложений: 113,4…295,7·10-5 ед. Си. (первый и второй квартиль, соответственно). Ресурсы магнетита и ильменита по 13 пересечениям в пределах западного участка месторождения составляют около 2,75 млн т. Из этих ресурсов на долю TiO 2 приходится около 815 тыс. т (при среднем содержании TiO 2 29,6 %), а на долю Fe 2 O 3 - 934,9 тыс. т (при среднем содержании Fe 2 O 3 34 %). Текстурные особенности описанных пород (слабая цементация) позволяют рекомендовать скважинную гидродобычу как метод первоочередной разработки как глауконитовых залежей, так и магнетит-ильменитового пласта.

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Upper Cretaceous zonal stratigraphy of the West Siberian Plain based on foraminifera

Cited by 11 publications

References 1 publication

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

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

Minerals of Rare Earth Elements in High-Phosphorus Ooidal Ironstones of the Western Siberia and Turgai Depression

Перспективы Комплексного Освоения Бакчарского Железорудного Месторождения (Западная Сибирь, Россия)

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