Geological Aspects and Genesis of Bentonites

Christidis, George E.; Huff, Warren D.

doi:10.2113/gselements.5.2.93

Cited by 153 publications

(70 citation statements)

References 29 publications

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“…Bentonites are clay-rich rocks primarily composed of montmorillonite (Mt) from the smectite group (Christidis and Huff, 2009). They are commonly used in science and industry because of their abundance in nature, low cost, environmental stability, beneficial physical and chemical properties like cation exchange capacity (CEC), swelling ability, high specific surface area, and high adsorption capacity (Majdan et al, 2005, Atia, 2008, Tiwari et al, 2008, Christidis and Huff, 2009, Eisenhour and Brown, 2009, Xi et al, 2010, Sarkar et al, 2012, Bagherifam et al, 2014.…”

Section: Introductionmentioning

confidence: 99%

“…They are commonly used in science and industry because of their abundance in nature, low cost, environmental stability, beneficial physical and chemical properties like cation exchange capacity (CEC), swelling ability, high specific surface area, and high adsorption capacity (Majdan et al, 2005, Atia, 2008, Tiwari et al, 2008, Christidis and Huff, 2009, Eisenhour and Brown, 2009, Xi et al, 2010, Sarkar et al, 2012, Bagherifam et al, 2014. They effectively adsorb cationic contaminants due to negative layer charge; however in their natural state they do not effectively adsorb organic and anionic contaminants due to their hydrophilic surface properties and negative layer charge (Kaufhold et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Investigating the expanding behavior and thermal stability of HDPy modified organo-bentonite by X-ray diffraction technique

Oruçoğlu

Schroeder

2016

Applied Clay Science

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating the expanding behavior and thermal stability of HDPy modified organo-bentonite by X-ray diffraction technique

Oruçoğlu

Schroeder

2016

Applied Clay Science

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“…Geoquimicamente, as bentonitas indicam origem a partir de material vulcânico gerado por magmas intermediários (andesíticos a riodacíticos) compatíveis com vulcanismo félsico (Martinez e Giambiagi, 2010). Essa mesma correlação é observada nas características cristaloquímicas das esmectitas com valores elevados de átomos de Fe 3+ (aproximadamente 0,3) e significativa substituição tetraédrica com 3,8 a 3,9 átomos de Si +4 por fórmula unitária, reforçando-se a origem a partir de vulcanismo intermediário (Christidis e Huff, 2009).…”

Section: Discussionunclassified

Bentonitas da Formação Irati no setor sul da Bacia do Paraná

Silva

Dani

Remus

et al. 2017

Geol. USP. Sér. Cient.

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Este artigo tem como objetivo identificar e apresentar argumentos mineralógicos e químicos que demonstrem a existência de níveis de bentonitas inseridos na Formação Irati, em afloramentos a leste da cidade de Aceguá, sul do Rio Grande do Sul. Tratam-se de níveis com pequena espessura (em média 4 cm) e grande extensão lateral, constituídos de argilitos maciços branco-acinzentados a esverdeados que, em campo, contrastam com os folhelhos que compõem a Formação Irati. As bentonitas da Formação Irati se caracterizam por serem compostas predominantemente por Ca-montmorilonita e formam a matriz fina da rocha, na qual se encontram dispersos cristais primários, ou magmáticos, com tamanho não superior a areia muito fina. Entre os principais minerais primários identificados e representativos do ambiente vulcânico explosivo, encontram‑se pseudomorfos de β-quartzo, sanidina, biotita, zircão, apatita e ilmenita, além de fragmentos de quartzo e feldspatos (splinters). Mais raramente, encontram-se fragmentos de meso e macrocharcoals dentro das camadas de bentonita, que contrastam com a maturidade e tipo de matéria orgânica não vegetal do folhelho Irati. Com base na geoquímica da rocha e na cristaloquímica da montmorilonita neoformada nos níveis de bentonita, infere-se sobre a natureza do vulcanismo precursor. Ambas as metodologias apontam que nesse período as cinzas vulcânicas que alcançaram a Bacia do Paraná originaram-se de vulcanismo com composição intermediária, em concordância com o que é conhecido sobre as manifestações da Província Vulcânica Choiyoi Inferior, sincrônica com a sedimentação da Formação Irati na Bacia do Paraná.

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“…The mineralogical and geochemical signatures of these sedimentary successions have been successfully used to infer constraints on the paleoenvironmental evaluation of some sedimentary basins (Bhatia & Crook 1986). Smectites in volcanic environments are the most important products of the alteration of volcanic detritus (Huff & Turkmenoglu 1981;Christidis et al 1995;Huff 2006;Christidis & Huff 2009). …”

Section: Introductionmentioning

confidence: 99%

Geochemistry of volcanogenic clayey marine sediments from the Hazar-Maden Basin (Eastern Turkey)

Akkoca¹,

Kürüm²,

Huff³

2013

Geologica Carpathica

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Abstract:The Hazar-Maden Basin sediments were deposited along the southern branch of the Neotethys Ocean margin during Late Maastrichtian-Middle Eocene times. X-ray powder diffraction (XRD), ICP-AES, ICP-MS and scanning electron microscopy (SEM) were performed on samples of the Upper Maastrichtian-Middle Eocene Hazar Group and the Middle Eocene Maden Complex from the Hazar-Maden Basin to investigate the main effects of depositional environmental parameters in three sections belonging to deeper marine (slope), proximal arc volcanic (Mastarhill and Yukar1bag sections) and shallow platform marine (Sebken section) settings. Marine sediments contain clay minerals (smectite, smectite/chlorite, chlorite, illite, interstratified illite/smectite, illite/chlorite, palygorskite), clinoptilolite, quartz, feldspar, calcite, dolomite, opal-CT and hematite. The clays are dominated by iron-rich smectites. La, Zr and Th concentrations are high in the shallow marginal Sebken section where the terrestrial detrital contribution is significant, while Sc and Co are more dominant in the deeper marine (slope) Yukar1bag section, which is represented by basic-type volcanism and a higher contribution of hydrothermal phases. In a chondrite-normalized REE diagram, the negative Eu anomaly in samples from Sebken, the section which was deposited in a shallow marine environment, is less significant than that of the other two sections indicating the presence of a high terrestrial contribution in that part of the basin. A decrease in LREE N /HREE N and La N /Yb N , La N /Sm N ratios from Sebken to Mastarhill and the Yukar1bag sections indicates deepening of the basin and an increasing contribution of volcanism in that direction.

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Geological Aspects and Genesis of Bentonites

Cited by 153 publications

References 29 publications

Investigating the expanding behavior and thermal stability of HDPy modified organo-bentonite by X-ray diffraction technique

Investigating the expanding behavior and thermal stability of HDPy modified organo-bentonite by X-ray diffraction technique

Bentonitas da Formação Irati no setor sul da Bacia do Paraná

Geochemistry of volcanogenic clayey marine sediments from the Hazar-Maden Basin (Eastern Turkey)

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