Ooidal ironstones in the Meso-Cenozoic sequences in western Siberia: assessment of formation processes and relationship with regional and global earth processes; Journal of Palaeogeography; Vol. 9, iss. 1
| Parent link: | Journal of Palaeogeography Vol. 9, iss. 1.— 2020.— [21 p.] |
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| مؤلف مشترك: | |
| مؤلفون آخرون: | , , , , , , , |
| الملخص: | Title screen 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. |
| اللغة: | الإنجليزية |
| منشور في: |
2020
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| الموضوعات: | |
| الوصول للمادة أونلاين: | http://earchive.tpu.ru/handle/11683/64796 https://doi.org/10.1186/s42501-019-0049-z |
| التنسيق: | الكتروني فصل الكتاب |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=662735 |
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| 200 | 1 | |a Ooidal ironstones in the Meso-Cenozoic sequences in western Siberia: assessment of formation processes and relationship with regional and global earth processes |f M. A. Rudmin, S. Banerjee, E. Abdullaev [et al.] | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 330 | |a 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. | ||
| 461 | |t Journal of Palaeogeography | ||
| 463 | |t Vol. 9, iss. 1 |v [21 p.] |d 2020 | ||
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 610 | 1 | |a ooidal ironstone | |
| 610 | 1 | |a pyrite framboids | |
| 610 | 1 | |a late cretaceous | |
| 610 | 1 | |a early paleogene | |
| 610 | 1 | |a Western Siberia | |
| 610 | 1 | |a Bakchar ironstone deposit | |
| 610 | 1 | |a redox conditions | |
| 610 | 1 | |a оолитовые железные руды | |
| 610 | 1 | |a фрамбоиды | |
| 610 | 1 | |a позднемеловая эпоха | |
| 610 | 1 | |a Западная Сибирь | |
| 610 | 1 | |a Бакчарское железорудное месторождение | |
| 610 | 1 | |a окислительно-восстановительные условия | |
| 701 | 1 | |a Rudmin |b M. A. |c geologist |c Associate Professor of Tomsk Polytechnic University, Candidate of Geological and Mineralogical Sciences |f 1989- |g Maksim Andreevich |3 (RuTPU)RU\TPU\pers\33254 |9 16999 | |
| 701 | 1 | |a Banerjee |b S. |g Santanu | |
| 701 | 1 | |a Abdullaev |b E. |g Elshan | |
| 701 | 1 | |a Ruban |b A. S. |c geologist |c engineer of Tomsk Polytechnic University |f 1991- |g Aleksey Sergeevich |3 (RuTPU)RU\TPU\pers\34023 |9 17590 | |
| 701 | 1 | |a Filimonenko |b E. A. |c specialist in the field of geo-ecology and geochemistry |c Assistant of the Department of Tomsk Polytechnic University |f 1990- |g Ekaterina Anatolievna |3 (RuTPU)RU\TPU\pers\31033 |9 15263 | |
| 701 | 1 | |a Lyapina |b E. E. |c geochemist |c Senior lecturer of Tomsk Polytechnic University, Candidate of geological-mineralogical sciences |f 1981- |g Elena Evgenievna |3 (RuTPU)RU\TPU\pers\33283 |9 17028 | |
| 701 | 1 | |a Kashapov |b R. S. |c geologist |c Research Engineer, Tomsk Polytechnic University |f 1985- |g Roman Sergeevich |3 (RuTPU)RU\TPU\pers\46485 |9 22150 | |
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| 856 | 4 | |u http://earchive.tpu.ru/handle/11683/64796 | |
| 856 | 4 | |u https://doi.org/10.1186/s42501-019-0049-z | |
| 942 | |c CF | ||