Facies types of sedimentary iron ore deposits and their geochemical features: Communication 1. Facies groups of sedimentary ores, their lithology, and genesis

Холодов, В. Н.; Nedumov, R. I.; Golubovskaya, E. V.

doi:10.1134/s0024490212060053

Cited by 22 publications

(10 citation statements)

References 13 publications

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“…Strumilin (1954) noted that nails were sourced from local mines, handcrafted for building purposes in St. Petersburg before the end of the 19th century. hydrogoethite with a small amount (5-7 wt%) of vivianite and psilomelaine, which matches the mineral composition of ocher from modern bog ores in the northeast part of the EEP (Kholodov, Nedumov, & Golubovskya, 2012;Kovalev, 1985).…”

Section: Methodssupporting

confidence: 68%

“…The thickness of the productive layer is <1 m, and it is settled in between glacial sediments and soil. Examined samples consist of goethite and hydrogoethite with a small amount (5–7 wt%) of vivianite and psilomelaine, which matches the mineral composition of ocher from modern bog ores in the northeast part of the EEP (Kholodov, Nedumov, & Golubovskya, ; Kovalev, ).…”

Section: Methodsmentioning

confidence: 61%

“…All types of iron ores examined in this study were deposited from aqueous solutions by oxidation of Fe 2+ to Fe 3+ (Kovalev, ; Maynard, ; Kholodov et al, ) and maintain the isotopic signatures of aquafacies of their origin (Goldstein & O'Nions, ; Hooker, Hamilton, & O'Nions, ). The Sr and Nd isotopic composition of springs, groundwaters, and rivers are governed by the isotopic ratios of these elements in the rocks of the catchment area (e.g., Möller, Dulski, & Gerstenberg, ).…”

Section: Discussionmentioning

confidence: 99%

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Nd and Sr isotopic composition of ancient iron‐made artifacts and ores from northwest Russia

2018

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Iron‐made artifacts from northwest Russia, including nails, arrowheads, and brackets used in the 13th–19th centuries, have a wide range of Sr and Nd isotopic composition (87Sr/86Sr = 0.710–0.737 and 143Nd/144Nd = 0.5115–0.5124). Authigenic iron ore sites mined in the region from 10th to 19th centuries preserve a similar range of isotopic compositions, suggesting artifacts retain the Sr and Nd signatures of their parent ores. Analyses of the ores also reveal two broad regions distinguished by their isotopic compositions, with the Precambrian Baltic craton in the northern part of the region having very radiogenic Sr and unradiogenic Nd isotopic compositions (87Sr/86Sr >0.7177 and 143Nd/144Nd <0.5119) compared with ores from the Paleozoic sedimentary cover of the East European platform to the south. The recognition of distinct geochemical provinces permits identification of the broad regions from which the various ores were mined, and demonstrates the utility of applying radiogenic isotopic analyses to artifacts and their potential geologic sources.

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Section: Methodssupporting

confidence: 68%

Section: Methodsmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

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Nd and Sr isotopic composition of ancient iron‐made artifacts and ores from northwest Russia

2018

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“…These phosphorus-containing weakly magnetic iron ores can be divided into hydrothermal iron ores and sedimentary iron ores. The phosphorus in the former type mainly exists in the form of apatite, whereas that in the latter type mainly exists in the form of oolitic collophanite, and a close relationship can be found between these minerals and iron minerals [9][10][11].…”

Section: Introductionmentioning

confidence: 96%

Studying on mineralogical characteristics of a refractory high-phosphorous oolitic iron ore

2020

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In this study, a high-phosphorus oolitic iron ore containing 44.70% Fe and 1.56% P from western Hubei of China was collected as the sample. The chemical composition, mineral composition, structure characteristics, dissemination characteristics, and iron and phosphorus occurrence state were carried out to investigate the mineralogical characteristics of the high-phosphorus oolitic iron. The results show that the high-phosphorus oolitic iron ore is a chemical sedimentary iron ore, mainly composed of oolite (more than 60%). Specifically, the ooids consists of oolite nuclei, collophanite girdles, and hematite and limonite girdles; the detritus is composed of fine-grained hematite and quartz feldspar; and cement is composed of carbonate minerals and worm-like hematite. The iron concentrate consists of iron-rich oolite and some hematite. The iron-bearing minerals in the oolite are mainly hematite, limonite, chlorite, and collophanite, and a close relationship between the hematite-limonite in the oolites and the iron-containing chamoisite can be observed. Upgrading iron and removing phosphorus from the high-phosphorus oolitic iron ore will be difficult by physical beneficiation.

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“…Their occurrences were reported in many regions of northern Europe, Asia and North America [25][26][27][28][29][30][31][32][33]. In the past, bog iron ores were used in iron metallurgy [24,28,[34][35][36], as pigments [24,37] and even as building material [24,[38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Mineral transformations and textural evolution during roasting of bog iron ores

Rzepa

Bajda

Gaweł

et al. 2015

J Therm Anal Calorim

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The processes occurring during roasting of bog iron ores were characterized using TG-DTG-DTA-QMS, XRD, FTIR and specific surface analysis. Removal of physically adsorbed water is followed by dehydroxylation of iron oxyhydroxides and oxidation of organic matter at 200-600°C. The main product of the transformations is disordered nanocrystalline (proto)hematite or hematite/-maghemite mixture, depending on organic matter content and heating conditions. The conversion of iron oxyhydroxides to hematite occurs at temperatures different than those reported for pure compounds. At higher temperatures, protohematite undergoes recrystallization to the stoichiometric hematite, and manganese oxides are partially reduced. At 1000°C, the roasting products consist of hematite and cristobalite together with Mn-Fe spinels if the initial ore contained Mn oxides. The admixtures of various secondary silicates were encountered as well. Low-to moderate-temperature roasting slightly affects the specific surface area and lowers volume of micropores. The hightemperature transformations lead to decrease in the specific surface area and to the destruction of porous texture of the bog iron ores. Although the general course of the processes during roasting was similar in all the samples, some of their details as well as mineralogy and properties of the products are highly dependent on the composition of the initial material.

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Facies types of sedimentary iron ore deposits and their geochemical features: Communication 1. Facies groups of sedimentary ores, their lithology, and genesis

Cited by 22 publications

References 13 publications

Nd and Sr isotopic composition of ancient iron‐made artifacts and ores from northwest Russia

Nd and Sr isotopic composition of ancient iron‐made artifacts and ores from northwest Russia

Studying on mineralogical characteristics of a refractory high-phosphorous oolitic iron ore

Mineral transformations and textural evolution during roasting of bog iron ores

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