Magnetic field hyperactivity during the early Neoproterozoic: A paleomagnetic and cyclostratigraphic study of the Katav Formation, southern Urals, Russia

Голованова, И. В.; Данукалов, К. Н.; Sal’manova, R. Yu.; Levashova, Natalia M.; Parfiriev, Nikita P.; Сергеева, Н. Д.; Meert, Joseph G.

doi:10.1016/j.gsf.2023.101558

Cited by 7 publications

(8 citation statements)

References 73 publications

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“…Обработка результатов измерений естественной остаточной намагниченности выполнена с помощью пакета программ Р. Дж. Энкина [Enkin, 1994] и PMTools [Ефремов, Веселовский, 2023]. Исследования проводились в ИГ УФИЦ РАН, г. Уфа.…”

Section: опробование и методы лабораторных исследованийunclassified

“…Известно, что значительная часть пород Южного Урала перемагничена в результате позднепалеозойской коллизии (в эпоху Киама) [Храмов, 1991; Шипунов, 1991; Свяжина и др., 2003; Пучков, 2010], однако существует целый ряд работ, в которых удалось выделить первичную компоненту намагниченности для различных возрастных интервалов [Павлов и Галле 2009;Голованова и др., 2011;Levashova et al, , 2015Golovanova et al, 2022Парфирьев и др., 2023]. Новые данные по урюкской свите могут внести свой вклад в доказательство первичности намагниченности пород ашинской серии венда, что, в свою очередь, можно будет использовать в глобальных палеогеографических реконструкциях, корреляции вендских стратиграфических уровней и, в целом, изучении поведения геомагнитного поля в истории Земли.…”

Section: Introductionunclassified

“…В разрезе пород зиганской свиты вдоль дороги Стерлитамак -Магнитогорск были обнаружены и изучены частые инверсии магнитного поля , а также проведены циклостратиграфические исследования [Levashova et al, 2021]. В 2022 году вышла работа [Golovanova et al, 2022], посвященная применению палеомагнитного метода в разделении литологически схожих пород басинской и зиганской свит при отсутствии разделяющей их куккараукской свиты. Маркирующий горизонт куккараукских конгломератов был изучен в районе руч.…”

Section: Introductionunclassified

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Paleomagnetic study of terrigenous rocks of the Uryuk Formation in the Southern Urals

Parfiriev,

Danukalov,

Golovanova

2024

Geol. vestn.

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In order to obtain new paleomagnetic data on Vendian rocks in the Southern Urals, we studied the high-temperature magnetization component in sandstones of the Uryuk Formation, the carrier of which is hematite. The distinguished hematite vector in the collection of samples differs from the previously obtained intermediate-, intermediate-high-temperature magnetization component of magnetite, which is part of the same rocks. The average directions of the hematite component of magnetization of the Uryuk Formation were compared with the average directions of the overlying Basu Formation. The metachrony of the magnetite component and the synchrony of the hematite component are suggested.

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Section: опробование и методы лабораторных исследованийunclassified

Section: Introductionunclassified

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Paleomagnetic study of terrigenous rocks of the Uryuk Formation in the Southern Urals

Parfiriev,

Danukalov,

Golovanova

2024

Geol. vestn.

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“…At the same time, in the western part of the Bashkirian uplift (Inzer synclinorium and Alatau anticlinorium), stratiform ore occurrences of copper have been found in Neoproterozoic redbed deposits (see Figure 1a,b, ore occurrences are indicated by numbers [24][25][26][27]29), which are referred to as sedimentary-diagenetic formations [2,4,5]. At present, stratiform copper deposits play an important economic role [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Cu and Au Mineralization of the Tolparovo Ore Occurrence: Evidence for the Formation of Redbed Copper Occurrences in Neoproterozoic Deposits of the Southern Urals

Michurin,

Kazbulatova

2024

Minerals

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The mineralization and geochemical features of the Tolparovo ore occurrence are studied to reveal the contribution of diagenetic and epigenetic processes in the formation of copper mineralization in redbed deposits. The methods of electron microscopy, ICP MS, X-ray fluorescence, X-ray phase, atomic absorption, thermogravimetric analyses, and C and O isotopic composition were used. The ore is confined to the fault zone and feathering dolomite–calcite veins, having formed at temperatures of ~330–200 °C and pressures of 0.8–0.2 kbar. Similar to other copper redbed occurrences of the Bashkirian uplift, the Tolparovo copper ore occurrence is confined to basal Neoproterozoic deposits. Siliciclastic and carbonate deposits of this level were accumulated at low paleoequator latitudes in arid climates of continental and coastal–marine environments close to evaporite ones. Rocks of this stratigraphic interval demonstrate increased background concentrations of copper (~2–5 times exceeding the clark), which explains the stratification of redbed copper ore occurrences, indicating a predominantly sedimentary copper source. However, most of the redbed copper ore occurrences of the Bashkirian uplift are located in tectonic zones and are associated with the dikes of the Inzer gabbrodolerite complex. This connects the generation of ore occurrences with the formation of the Southern Urals Arsha Large Igneous Province (707–732 Ma) and the activity of postmagmatic fluids. Magmatic processes were presumably activated due to the collapse of the Rodinia supercontinent. It is shown that copper mineralization in stratiform deposits may result from a joint manifestation of dia- and epigenesis processes.

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“…Because the magnetic mineralogy of carbonate rocks is influenced by the redox state (Pourbaix, 1974) and the chemical composition of seawater and pore water, valuable insights into the Earth's paleoenvironmental conditions can be acquired from them (Evans & Heller, 2003;Liu et al, 2012;Roberts et al, 2013). Carbonate sedimentation, including those primarily sourced from marine organ-isms (Grotzinger & James, 2000), allows for the correlation of paleomagnetic information in carbonate deposits with significant geological events that influenced the evolution of life (Trindade et al, 2003;Trindade & Macouin, 2007;Golovanova et al, 2023). However, the search for the primary detrital remanence of carbonate rocks often encounters single-polarity components that do not align with the corresponding age of the unit (R. D. Elmore et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Clay minerals and continental-scale remagnetisation: a case study of South American Neoproterozoic carbonates

Bellon,

Trindade,

Williams

et al. 2023

Preprint

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Carbonate rocks frequently undergo remagnetisation events, which can partially/completely erase their primary detrital remanence and introduce a secondary component through thermoviscous and/or chemical processes. Despite belonging to different basins hundreds of kilometres apart, the Neoproterozoic carbonate rocks of South America (over the Amazon and São Francisco cratons) exhibit a statistically indistinguishable single-polarity characteristic direction carried by monoclinic pyrrhotite and magnetite, with paleomagnetic poles far from an expected detrital remanence. We use a combination of classical rock magnetic properties and micro-to-nanoscale imaging/chemical analysis using synchrotron radiation to examine thin sections of these remagnetised carbonate rocks. Magnetic data shows that most of our samples failed to present anomalous hysteresis properties, usually referred to as part of the “fingerprints” of carbonate remagnetisation. Combining scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS), highly sensitive X-ray fluorescence (XRF), and X-ray absorption spectroscopy (XAS) revealed the presence of subhedral/anhedral magnetite, or spherical grains with a core-shell structure of magnetite surrounded by maghemite. These grains are within the pseudo-single domain size range (as well as most of the iron sulphides) and spatially associated with potassium-bearing aluminium silicates. Although fluid percolation and organic matter maturation might play an important role, smectite-illitisation seems a crucial factor controlling the growth of these phases. X-ray diffraction analysis identifies these silicates as predominantly highly crystalline illite, suggesting exposure to epizone temperatures. Therefore, we suggest that the remanence of these rocks should have been thermally reset during the final Gondwana assembly, and locked in a successive cooling event during the Early-Middle Ordovician.

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Magnetic field hyperactivity during the early Neoproterozoic: A paleomagnetic and cyclostratigraphic study of the Katav Formation, southern Urals, Russia

Cited by 7 publications

References 73 publications

Paleomagnetic study of terrigenous rocks of the Uryuk Formation in the Southern Urals

Paleomagnetic study of terrigenous rocks of the Uryuk Formation in the Southern Urals

Cu and Au Mineralization of the Tolparovo Ore Occurrence: Evidence for the Formation of Redbed Copper Occurrences in Neoproterozoic Deposits of the Southern Urals

Clay minerals and continental-scale remagnetisation: a case study of South American Neoproterozoic carbonates

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