Genesis of giant Early Proterozoic magnesite and related talc deposits in the Mafeng area, Liaoning Province, NE China

Misch, David; Pluch, Hannes; Mali, Heinrich; Ebner, Fritz; Huang, Hui

doi:10.1016/j.jseaes.2018.04.005

Cited by 12 publications

(5 citation statements)

References 23 publications

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“…It is considered as a member of the calcite group of carbonate minerals that is a principal source of magnesium (Beyecha, 2016); Shand (2006). The mineral has the same crystal structure as calcite, a calcium carbonate with a hardness and texture similar to white magnesite and marble (Chen & Tao, 2004;Misch, 2012;Pluch, 2018;Siegesmund & Török, 2010). In its natural state, magnesite exists as a white, gray, or brown porous crystal (Chauke, 2020;Shand, 2006).…”

Section: Introductionmentioning

confidence: 99%

Assessment of Tanzania Magnesite’s Suitability for the Struvite Recovery and Other Industrial Applications

Illakwahhi,

Vegi,

Srivast

2024

Preprint

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Magnesite (MgCO3) is a valuable mineral with wide industrial applications; thus, geochemical familiarity and deposit quality are critical for making the best use of these resources. Tanzania is reported to have magnesite deposits in at least 12 different locations; however, four of these were chosen at random for study. This study aimed to examine the mineralogical and elemental composition of rock samples from Chambogo (KL), Muriatata (AR), Lobolosoiti (MN), and Chikaza (DM) using x-ray fluorescence (XRF) and powder x-ray diffraction (XRD). XRF examination revealed that sample KL, AR, MN, and DM, respectively, contain 45.21%, 46.06%, 43.21%, and 43.21% of magnesium oxide. Besides MgO, all samples contained SiO2, Fe2O3, Al2O3, CaO and several trace elements as impurities, with only calcium oxide, iron, arsenic and chromium identified as impurities of concern. However, XRD analysis indicated magnesite as the major mineral phase in samples KL, AR, MN, and DM, with percentage concentrations of 65.2, 68.14, 63.87, and 68, respectively. In all samples, strong peaks at 2θ~ 33o, 43o, 54o and 55o, confirmed the crystalline nature of magnesite. Calcination of these samples however, resulted in peak shift and phase change, with main diffraction peaks generated at 2θ~ 36.9o, 42.9o and 62.3o, confirming the formation of crystalline MgO. Despite considerable contamination levels of CaO, iron, chromium, and arsenic in the samples, all samples had enough magnesite to be mined for industrial use.

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Section: Introductionmentioning

confidence: 99%

Assessment of Tanzania Magnesite’s Suitability for the Struvite Recovery and Other Industrial Applications

Illakwahhi,

Vegi,

Srivast

2024

Preprint

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“…Differently from dolomite, magnesite mineralization only occurs at a relatively higher temperature (>60 • C) with elevating CO 2 pressure. On the other hand, talc mineralization mainly occurs in hydrothermal activities on dolomite and magnesite [14,15], where the silicate composition originates from the hydrothermal solution and the carbonate composition originates from dolomite and/or magnesite. Due to the geological characteristics, magnesite mineralization is mainly associated with carbonate rocks with talc as an accessory mineral, and thus, the commonly found gangue minerals are calcite, dolomite, and talc.…”

Section: Introductionmentioning

confidence: 99%

Detection of Magnesite and Associated Gangue Minerals using Hyperspectral Remote Sensing—A Laboratory Approach

Chung

Wang

et al. 2020

Remote Sensing

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This study introduced a detection method for magnesite and associated gangue minerals, including dolomite, calcite, and talc, based on mineralogical, chemical, and hyperspectral analyses using hand samples from thirteen different source locations and Specim hyperspectral short wave infrared (SWIR) hyperspectral images. Band ratio methods and logistic regression models were developed based on the spectral bands selected by the random forest algorithm. The mineralogical analysis revealed the heterogeneity of mineral composition for naturally occurring samples, showing various carbonate and silicate minerals as accessory minerals. The Mg and Ca composition of magnesite and dolomite varied significantly, inferring the mixture of minerals. The spectral characteristics of magnesite and associated gangue minerals showed major absorption features of the target minerals mixed with the absorption features of accessory carbonate minerals and talc affected by mineral composition. The spectral characteristics of magnesite and dolomite showed a systematic shift of the Mg-OH absorption features toward a shorter wavelength with an increased Mg content. The spectral bands identified by the random forest algorithm for detecting magnesite and gangue minerals were mainly associated with spectral features manifested by Mg-OH, CO3, and OH. A two-step band ratio classification method achieved an overall accuracy of 92% and 55.2%. The classification models developed by logistic regression models showed a significantly higher accuracy of 98~99.9% for training samples and 82–99.8% for validation samples. Because the samples were collected from heterogeneous sites all over the world, we believe that the results and the approach to band selection and logistic regression developed in this study can be generalized to other case studies of magnesite exploration.

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“…However, throughout talc applications, new requirements and/or new limitations appeared such as (i) the need of talc ore purity, particularly in cosmetic and pharmacologic uses; (ii) the difficulty to disperse talc in a water medium, and (iii) the need to use submicronic talc particles to develop polymer based nanocomposites (Usuki et al, 1993a, b;Kojima et al, 1993a, b). To satisfy these respective requirements, several possible ways were put forward: (i) the need of high purity talc was solved by the exploration of new highly pure talc deposit (Misch et al, 2018) and/or the improvements of techniques to purify talc ore (Baba et al, 2015;Castillo et al, 2014;Dumas et al, 2015a); (ii) talc dispersion in water medium was improved by using surface treatment such as pre-coating by carboxyl methyl cellulose adsorption, for example (Bonino et al, 2002;Bacchin et al, 2006); and (iii) the need of submicronic talc particles led to the development of grinding processes such as air jet milling, sonication, stirred ball milling and dry milling (Godet, 2001). However, using these top-down approaches, the results were not as successful since natural talc is difficult to ground homogeneously below 1 µm without leading to amorphization and structural disordering (Liao and Senna, 1992;Sanchez-Soto et al, 1997;Dellisanti et al, 2009;Cavaida et al, 2015;Borges et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…shows the comparison between a natural pink talc from China (François Martin's collection), and a green synthetic talc whose Mg was replaced by Ni. The natural sample loses its color after grinding (like the colored talc samples studied byMisch et al (2018), this talc is very pure and contains no other associated mineral which could explain the pink color, which is probably due to the arrangement of crystallites in the bulk ore inducing light reflection phenomenon) while the synthetic Ni sample retains its green color. The paper of Dumas et al(2015b), based on the superior visibility of Ni in EXAFS spectroscopy with respect to Mg, aimed to first understand the genesis of Ni-rich talc from nucleation to crystal growth.…”

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confidence: 98%

A review of Ni and Co incorporation during talc synthesis: Applications to crystal chemistry, industrial compounds and natural Ni- and Co-rich ore

Martin

Aymonier

Einloft

et al. 2019

Journal of Geochemical Exploration

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This article is rather a broad review that presents the main results of studies on mineral syntheses incorporating Ni and Co cations, the interest of developing materials of this type, and some applications where these mineral materials are used as mineral filler. A reflection is then conducted to show that the mineral synthesis rich in Ni and Co makes minerals appear very similar to those found in Ni-and Co-rich lateritic environment. The studies of these lateritic natural environments can provide information on the formation processes of synthetic minerals, and conversely. These two thematic fields will be able to cross-check their data and allow to solve, for example, the chemical fractionation problems encountered in these lateritic environments.

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Genesis of giant Early Proterozoic magnesite and related talc deposits in the Mafeng area, Liaoning Province, NE China

Cited by 12 publications

References 23 publications

Assessment of Tanzania Magnesite’s Suitability for the Struvite Recovery and Other Industrial Applications

Assessment of Tanzania Magnesite’s Suitability for the Struvite Recovery and Other Industrial Applications

Detection of Magnesite and Associated Gangue Minerals using Hyperspectral Remote Sensing—A Laboratory Approach

A review of Ni and Co incorporation during talc synthesis: Applications to crystal chemistry, industrial compounds and natural Ni- and Co-rich ore

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