Evolution and paragenetic context of low δD hydrothermal fluids from the Panasqueira W-Sn deposit, Portugal: new evidence from microthermometric, stable isotope, noble gas and halogen analyses of primary fluid inclusions

Polya, David A.; Foxford, K.A.; Stuart, Finlay M.; Boyce, Adrian J.; Fallick, Anthony E.

doi:10.1016/s0016-7037(00)00459-2

Cited by 98 publications

(71 citation statements)

References 47 publications

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“…6). The expulsion of hydrocarbons during the lower Cretaceous may offer an explanation, as organic material acts as a substantial source of isotopically light hydrogen (Ziegler et al, 1994;Polya et al, 2000).…”

Section: Gmi Ridgementioning

confidence: 99%

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Chemical and mineralogical characterisation of illite–smectite: Implications for episodic tectonism and associated fluid flow, central Australia

Middleton

Uysal

Golding

2015

Geochimica et Cosmochimica Acta

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Section: Gmi Ridgementioning

confidence: 99%

“…10c; Polya et al, 2000). Correlations between Th and δD may simply reflect lower degrees of alteration and increasing thermal degradation of organics at systematically greater depths.…”

mentioning

confidence: 99%

Chemical and mineralogical characterisation of illite–smectite: Implications for episodic tectonism and associated fluid flow, central Australia

Middleton

Uysal

Golding

2015

Geochimica et Cosmochimica Acta

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“…In particular, most (though not all) anomalous (relative to oxygen-18) deuterium variability has been found in crustal, related to ore deposits, fluid inclusions of paleometeoric water and predominantly ascribed to influence of water organic matter (e.g., coals or coaly sediments) interactions [Polya et al, 2000].…”

mentioning

confidence: 99%

Insights into hydrological regime of Lake Vostok from differential behavior of deuterium and oxygen‐18 in accreted ice

et al. 2010

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[1] We use isotopic data (deuterium and oxygen-18) of the recently recovered deepest Vostok ice core section (down to 3650 m depth) to study processes leading to the formation of lake ice and the hydrological regime of subglacial Lake Vostok. The significant variability of the lake ice isotopic content implies fluctuations in physical conditions of ice formation (mainly, volume and/or growth rate of frazil ice crystals) as well as variations of the isotope composition of the freezing water. The latter implies a poor mixing of the source waters (glacier melt and hydrothermal water) with the water of the main lake body. Poor mixing within the lake may have important consequences for the lake's chemical and gas balance and, particularly, for its microbiological content. A poorly mixed lake may provide ecological niches where microbial life can hide from high oxygen concentrations likely typical for the lake. We also show that the isotopic content of the main lake's input (meltwater) significantly differs from that of the output (lake ice), which can be explained by the contribution of an additional (hydrothermal) source. This latter conclusion is supported by the observed noncovariant behavior of deuterium and oxygen-18 isotopes in the lake ice.

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“…Many studies demonstrated that even the high-T fluids operating in a magmatic environment can be derived from external sources (e.g. Banks et al 2000;Polya et al 2000;Dolníček et al 2012). The opening of the pegmatite system to external fluids is not surprising because the diagonal distribution of quartz-hosted fluid inclusion data in the Th-Tm plot (Fig.…”

Section: Nature and Origin Of The Fluid Phase Hosted By Fluid Inclusionsmentioning

confidence: 99%

Textural and compositional evidence for a polyphase saturation of tourmaline in granitic rocks from the Třebíč Pluton (Bohemian Massif)

Buriánek¹,

Dolníček²,

Novák³

2016

J. Geosci.

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Crystallization of granite melts produced several textural types of granites and pegmatites in the Třebíč Pluton: dykes of volumetrically dominant muscovite-biotite granite (MBG) locally containing tourmaline nodules with leucocratic halos, minor oval pods to dykes of tourmaline granite and veins of tourmaline pegmatite, both enclosed in the MBG. An aplitic zone with comb textures, locally developed in MBG along the contact with surrounding durbachites, suggests high degree of undercooling. Evidence for polyphase saturation of tourmaline was observed within MBG and related granitic rocks including the following textural and compositional types of tourmaline: (i) nodules surrounded by leucocratic halos; (ii) euhedral to subhedral grains randomly distributed within tourmaline granite and tourmaline-quartz accumulations with leucocratic halos in the marginal part of granite dykes; (iii) rare columnar crystals of black tourmaline occurring locally in central parts of pegmatite; (iv) dravite-rich rims and late dravite veinlets in tourmaline grains from nodules, suggesting crystallization from hydrothermal fluids in the system open to host rocks as supported also by fluid inclusions study.

show abstract

Evolution and paragenetic context of low δD hydrothermal fluids from the Panasqueira W-Sn deposit, Portugal: new evidence from microthermometric, stable isotope, noble gas and halogen analyses of primary fluid inclusions

Cited by 98 publications

References 47 publications

Chemical and mineralogical characterisation of illite–smectite: Implications for episodic tectonism and associated fluid flow, central Australia

Chemical and mineralogical characterisation of illite–smectite: Implications for episodic tectonism and associated fluid flow, central Australia

Insights into hydrological regime of Lake Vostok from differential behavior of deuterium and oxygen‐18 in accreted ice

Textural and compositional evidence for a polyphase saturation of tourmaline in granitic rocks from the Třebíč Pluton (Bohemian Massif)

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