Mineralogy of low grade metamorphosed manganese sediments of the Urals: Petrological and geological applications

Brusnitsyn, A. I.; Starikova, E. V.; Zhukov, I. G.

doi:10.1016/j.oregeorev.2016.07.004

Cited by 11 publications

(5 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Силикаты являются характерными минералами марганцевых отложений, подвергшихся метаморфизму, в т. ч. в невысокой степени [Brusnitsyn et al, 2017]. В изученных породах установлено 15 минералов, относящихся к силикатам (см.…”

Section: характеристика породообразующих минераловunclassified

“…Кристаллизация тефроита, сонолита, пироксмангита и спессартина также не требует чрезмерно высоких температур и давлений. Эти минералы устойчивы при РТ-параметрах пренит-пумпеллиитовой фации метаморфизма, а возможно, и при более низких [Брусницын, 2013;Brusnitsyn et al, 2017]. Условия регионального метаморфизма пород Лемвинской зоны Пай-Хоя оцениваются как не превышающие низкотемпературной зоны зеленосланцевой фации: T = 300-400°C, P<6 бар [Старикова, 2011], поэтому присутствие в изученных породах силикатов вполне закономерно.…”

Section: постседиментационные преобразования металлоносных отложенийunclassified

“…Вместе с тем, локальное развитие тефроита, сонолита и пироксмангита показывает, что концентрация углекислоты в системе в целом оставалась довольно высокой. Более подробно условия образования силикатов марганца рассмотрены нами в специальных работах [Брусницын, 2013;Brusnitsyn et al, 2017].…”

Section: постседиментационные преобразования металлоносных отложенийunclassified

See 2 more Smart Citations

The Nadeiyakha Ore occurrence (Pai-Khoi, Russia): an example of ferromanganese metasediments in carbonaceous dolomitic shales

Brusnitsyn¹,

Starikova²,

Ignatova³

et al. 2019

Литология и полезные ископаемые

View full text Add to dashboard Cite

The paper presents the results of study of metalliferous (ferromanganese and manganese) rocks at the Nadeiyakha ore occurrence (Pai-Khoi) discovered in 2010. The metalliferous deposit represents a stratiform body lying conformably in the Upper Devonian carbonaceous siliceous and clayey–carbonate–siliceous shales. The ore bed occurs 180 m below the regional Famennian manganiferous rock association in Pai-Khoi. Discovery of the Nadeiyakha ore occurrence suggests the existence of an additional age interval of Mn accumulation within the Devonian sequence of this region. The studied metalliferous rocks display structures and textures typical of the metasedimentary rocks. In terms of composition, they are divided into two varieties: (i) ferromanganese (quartz–carbonate) rocks composed of quartz, dolomite, kutnahorite, rhodochrosite, siderite, and calcite; (ii) manganiferous (quartz–rhodochrosite–silicate) rocks composed of quartz, rhodochrosite, tephroite, sonolite, and pyroxmangite. The Nadeiyakha ore occurrence is marked by the abundance of dolomite in the ferromanganese rocks and host shales. In terms of the relationship of indicator elements (Al, Ti, Fe, and Mn), ferromanganese and manganese rocks are comparable with the recent metalliferous and ore-bearing sediments. The carbon isotope composition in carbonates (δ13C from –16.4 to –7.8‰ PDB) corresponds to authigenic carbonates related to the involvement of carbon dioxide produced during the microbial decomposition of organic matter at the stage of dia- and/or catagenesis. Geological and petrographic observations show that the ferruginous and manganiferous sediments were deposited synchronously with the terrigenous–carbonate–siliceous sediments. Fe and Mn could be sourced from hydrothermal solutions or interstitial diagenetic waters. The latter version seems to be more probable. Metals were accumulated in a depression-trap characterized by a periodic stagnation of bottom waters. Such sedimentation setting promoted the formation of paragenetic association of ferruginous and manganiferous sediments with the carbonaceous sediments and fostered reductive conditions during the postsedimentary mineral formation. Calcium carbonates contained in the primary rocks were subjected to dolomitization during the dia- or catagenesis. This process was promoted by the mobilization of Mg released during the transformation of clay minerals owing to the montmorillonite–illite transition. Iron and manganese carbonates were formed during the later replacement of oxides of Mn3+, Mn4+, and Fe3+. Crystallization of manganese silicates also started at early stages of lithogenesis and terminated during the regional metamorphism of metalliferous rocks.

show abstract

Section: характеристика породообразующих минераловunclassified

Section: постседиментационные преобразования металлоносных отложенийunclassified

See 1 more Smart Citation

The Nadeiyakha Ore occurrence (Pai-Khoi, Russia): an example of ferromanganese metasediments in carbonaceous dolomitic shales

Brusnitsyn¹,

Starikova²,

Ignatova³

et al. 2019

Литология и полезные ископаемые

View full text Add to dashboard Cite

show abstract

“…Mineralogically they are varied, but most commonly include the carbonates kutnohorite (Ca 2+ Mn 2+ [CO3]2) and rhodochrosite (Mn 2+ CO3), diverse manganese silicates, and the manganese oxides cryptomelane (K[Mn 4+ , Mn 2+ ]8O16) and pyrolusite (Mn 4+ O2) (Dasgupta, 1997;Johnson et al, 2016). This variability reflects differences in the composition of the seawater primary precipitates, diagenetic modification in the sediment pile, metamorphic transformations and, in some instances, further alteration during ore formation (Dasgupta et al, 1990(Dasgupta et al, , 1993Calvert and Pedersen, 1996;Mücke et al, 1999;Chisonga et al, 2012;Brusnitsyn et al, 2017;Johnson et al, 2019). Consequently, using manganese-rich rocks to infer paleo-environmental conditions is challenging and requires unraveling the paragenetic sequence of minerals.…”

Section: Introductionmentioning

confidence: 99%

Unraveling sedimentary precursors and metal enrichment of high-grade metamorphosed manganese-rich rocks from the Borborema Province, northeastern Brazil

Santos

Amaral

Konhauser

et al. 2021

Ore Geology Reviews

View full text Add to dashboard Cite

“…(7) The metamorphic facies based on mineral paragenesis of basic rocks [9,10]. (8) Index minerals in clastic rocks having particular compositions [11,37], such as pyrophyllite [38], paragonite [39], mixed Pg/Ms [39], the kaolinite group polytypes [40][41][42], sudoite [43,44], epidote [45], chloritoid [46], stilpnomelane [47]. (9) The color of conodonts [23,48,49], which gradually change from amber to brown to black, as their small amounts of organic matter pass through the temperature range 50 • C to 300 • C and to gray, white, and finally hyaline, at higher temperatures.…”

mentioning

confidence: 99%

Editorial for Minerals Special Issue “From Diagenesis to Low-Grade metamorphism”

Nieto

Campo

2020

Minerals

View full text Add to dashboard Cite

show abstract

Mineralogy of low grade metamorphosed manganese sediments of the Urals: Petrological and geological applications

Cited by 11 publications

References 33 publications

The Nadeiyakha Ore occurrence (Pai-Khoi, Russia): an example of ferromanganese metasediments in carbonaceous dolomitic shales

The Nadeiyakha Ore occurrence (Pai-Khoi, Russia): an example of ferromanganese metasediments in carbonaceous dolomitic shales

Unraveling sedimentary precursors and metal enrichment of high-grade metamorphosed manganese-rich rocks from the Borborema Province, northeastern Brazil

Editorial for Minerals Special Issue “From Diagenesis to Low-Grade metamorphism”

Contact Info

Product

Resources

About