Structural state and differusion of impurities in natural quartz of different genesis

Stenina, N. G.; Bazarov, L. Sh.; Shcherbakova, M. Ya.; Mashkovtsev, R. I.

doi:10.1007/bf00311475

Cited by 16 publications

(8 citation statements)

References 14 publications

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“…6d). Stenina et al (1984) described similar spots in quartz, which was intensively exposed to electron radiation. By using TEM imaging these authors identified these structures as amorphous (noncrystalline) micro-domains, which contain molecular water.…”

Section: Properties and Trace Elements Of Igneous Quartzmentioning

confidence: 89%

“…According to Stevens Kalceff & Phillips (1995) the red CL emission around 1.96 eV is related to non-bridging oxygen hole centre (NBOHC, an oxygen dangling bond; ≡Si−O•) with hydrogen as precursor (≡Si−OH). Defect structures with hydroxyl are strongly affected by the temperature and ionising radiation: protons and hydroxyl are released and concentrate as molecular water in larger defect structures and micropores (Stenina et al 1984;Heggie 1992). The increase in the red emission of igneous quartz during electron bombardment is explained by radiolysis of hydroxyl groups in the quartz lattice, which results in the formation of NBOHC.…”

Section: Properties and Trace Elements Of Igneous Quartzmentioning

confidence: 99%

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The evolution of late-Hercynian granites and rhyolites documented by quartz – a review

Müller¹,

Kerkhof²,

Behr³

et al. 2010

Sixth Hutton Symposium on the Origin of Granites and Related Rocks: Proceedings of a Symposium Held in Stellenbosch, South Afri

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The potential of igneous quartz for providing a better understanding of magmatic processes is demonstrated by studying late-Hercynian rhyolites and granites from central and western Europe. Cathodoluminescence (CL) reveals growth patterns and alteration structures within igneous quartz reflecting the magma crystallisation history. The relatively stable and blue-dominant CL of zoned phenocrysts is principally related to variations in the Ti concentration, which is a function of the crystallisation temperature. The Al/Ti ratio of igneous quartz increases with progressive magma differentiation, as Ti is more compatible, compared to Al, Li, K, Ge, B, Fe, P during magma evolution. The red-dominant CL of the anhedral groundmass quartz in granite is unstable during electron bombardment and associated with OH-and H 2 O-bearing lattice defects. Thus, CL properties of quartz are different for rocks formed from H 2 O-poor and H 2 O-rich melts. Both groundmass and phenocrysts in granites are rich in alteration structures as a result of interaction with deuteric fluids during cooling, whereas phenocrysts in extrusive rocks do not usually contain such structures. The combined study of trace elements along with the analysis of quartz textures and melt inclusion inventories may reveal detailed PTX-paths of granite magmas. This study shows that quartz is a sensitive indicator for physico-chemical changes during the evolution of silica-rich magmas. Common growth textures show a wide variety in quartz phenocrysts in rhyolites and some granites. We present a classification of textures, which formed as a result of heterogeneous intra-granular lattice defects and impurities. The alternation of growth and resorption microtextures reflects stepwise adiabatic and non-adiabatic magma ascent, temporary storage of magma in reservoirs and mixing with more mafic, hotter magma. The anhedral groundmass quartz overgrowing early-magmatic phenocrysts in granites is free of growth zoning.

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Section: Properties and Trace Elements Of Igneous Quartzmentioning

confidence: 89%

Section: Properties and Trace Elements Of Igneous Quartzmentioning

confidence: 99%

The evolution of late-Hercynian granites and rhyolites documented by quartz – a review

Müller¹,

Kerkhof²,

Behr³

et al. 2010

Sixth Hutton Symposium on the Origin of Granites and Related Rocks: Proceedings of a Symposium Held in Stellenbosch, South Afri

View full text Add to dashboard Cite

show abstract

“…6d). Stenina et al (1984) described similar spots in quartz, which was intensively exposed to electron radiation. By using TEM imaging, these authors identified these structures as amorphous (non-crystalline) micro-domains, which contain molecular water.…”

Section: Properties and Trace Elements Of Igneous Quartzmentioning

confidence: 89%

The evolution of late-Hercynian granites and rhyolites documented by quartz – a review

Müller¹,

Kerkhof

Behr

et al. 2009

Earth and Environmental Science Transactions of the Royal Socie

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The potential of igneous quartz for providing a better understanding of magmatic processes is demonstrated by studying late-Hercynian rhyolites and granites from central and western Europe. Cathodoluminescence (CL) reveals growth patterns and alteration structures within igneous quartz reflecting the magma crystallisation history. The relatively stable and blue-dominant CL of zoned phenocrysts is principally related to variations in the Ti concentration, which is a function of the crystallisation temperature. The Al/Ti ratio of igneous quartz increases with progressive magma differentiation, as Ti is more compatible, compared to Al, Li, K, Ge, B, Fe, P during magma evolution. The red-dominant CL of the anhedral groundmass quartz in granite is unstable during electron bombardment and associated with OH-and H 2 O-bearing lattice defects. Thus, CL properties of quartz are different for rocks formed from H 2 O-poor and H 2 O-rich melts. Both groundmass and phenocrysts in granites are rich in alteration structures as a result of interaction with deuteric fluids during cooling, whereas phenocrysts in extrusive rocks do not usually contain such structures. The combined study of trace elements along with the analysis of quartz textures and melt inclusion inventories may reveal detailed PTX-paths of granite magmas. This study shows that quartz is a sensitive indicator for physico-chemical changes during the evolution of silicarich magmas. Common growth textures show a wide variety in quartz phenocrysts in rhyolites and some granites. This paper presents a classification of textures, which formed as a result of heterogeneous intra-granular lattice defects and impurities. The alternation of growth and resorption microtextures reflects stepwise adiabatic and non-adiabatic magma ascent, temporary storage of magma in reservoirs and mixing with more mafic, hotter magma. The anhedral groundmass quartz overgrowing early-magmatic phenocrysts in granites is free of growth zoning.

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“…Despite the variable mechanisms controlling their incorporation into quartz, trace elements are considered important petrogenetic indicators for interpreting the conditions of mineral formation, in order to reveal either the provenance of quartz, or to reconstruct the genesis of ore deposits and the origin of metal-bearing fluids (e.g. Bambauer, 1961;Dennen, 1964Dennen, , 1966Dennen, , 1967Walenczak, 1969;Lyakhovich, 1972;Suttner and Leininger, 1972;Stenina et al, 1984;Hallbauer, 1992;Heynke et al, 1992;Gotze and Lewis, 1994;Gotze and Plotze, 1997;Monecke et al, 1999Monecke et al, , 20002002a;Gotze and Zimmerle, 2000;Larsen et al, 2000Larsen et al, , 2004Poutivcev et al, 2001;Muller et al, 2002Muller et al, , 2003aMuller et al, ,b, 2008Kostova et al, 2004;Gotze, 2009b). For genetic interpretations, the contrasting behaviour of different trace elements in quartz has to be considered.…”

Section: Trace Elementsmentioning

confidence: 99%

Chemistry, textures and physical properties of quartz — geological interpretation and technical application

Götze¹

2009

Mineral. mag.

235

129

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Quartz is one of the most abundant minerals in the Earth’s crust and the most important silica mineral, occurring in large amounts in igneous, metamorphic and sedimentary rocks. The mineral is widely used as a raw material in several industrial applications. Because of its chemical composition (SiO2) and its specific properties, quartz can be used both as a bulk product (e.g. quartz sands in the glass or foundry industry) and as a high-tech material (e.g. piezo or optical quartz). Dependent on the specific conditions of either natural or synthetic formation, quartz can display typomorphic properties. Variations in crystal shape, specific micro-structure, trace element or isotope compositions, characteristic spectroscopic properties, etc. may be controlled by the genesis of the quartz involved. Accordingly, the defect structure of quartz is a fingerprint of its conditions of formation. A knowledge of the interrelation between quartz genesis and the specific properties developed at that time can be used both for the reconstruction of geological processes and for specific technical applications. Selected examples in the present study give an overview of how to analyse and use the specific information inherent in the mineral quartz.

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Structural state and differusion of impurities in natural quartz of different genesis

Cited by 16 publications

References 14 publications

The evolution of late-Hercynian granites and rhyolites documented by quartz – a review

The evolution of late-Hercynian granites and rhyolites documented by quartz – a review

The evolution of late-Hercynian granites and rhyolites documented by quartz – a review

Chemistry, textures and physical properties of quartz — geological interpretation and technical application

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