Petrology of the San Leone magnetite skarn deposit (S.W. Sardinia)

Verkaeren, Jean; Bartholomé, Paul

doi:10.2113/gsecongeo.74.1.53

Cited by 16 publications

(15 citation statements)

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“…This composition is close to the ideal The rarity of monomineralic ilvaite layers must be explained by a very restricted range of stability conditions and original composition of the altered rocks: i.e. decreasing temperatures, high #H2o and very low #co2, and probably fairly high to medium oxygen fugacities (Bartholom6 and Dimanche, 1967;Verkaeren and Bartholom6, 1979). The stability fields of ilvaite imply the action of a fluid phase with exceedingly low Xco2, first on hedenbergite or, later, on hedenbergite magnetite assemblages.…”

Section: Chemical Compositionsupporting

confidence: 60%

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An occurrence of ilvaite layers in the Cinco Villas metasomatic rocks, Western Pyrenees (Spain)

Pesquera¹

1986

Mineral. mag.

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A B S T RA C T. In the Artikutza area, near the contact with the southern Aya granite, skarns containing hedenbergite, grandite, epidote, quartz, calcite, actinolite, idocrase and magnetite occur and have been found to contain ilvaite layers. This is the second reported occurrence of ilvaite in Spain; spectral reflectances, colour values. Vickers hardness numbers and chemical composition are given. The monomineralic ilvaite lens intercalation developed by hydrothermal alteration ofhedenbergite in a second stage of skarn formation.

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Section: Chemical Compositionsupporting

confidence: 60%

“…These hydrothermal assemblages are as a rule more complex and are never monomineralic, but the ilvaite-bearing rocks studied have rarely minor amounts of calcite (Verkaeren and Bartholom6, 1979).…”

Section: Chemical Compositionmentioning

confidence: 99%

An occurrence of ilvaite layers in the Cinco Villas metasomatic rocks, Western Pyrenees (Spain)

Pesquera¹

1986

Mineral. mag.

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“…The formation of the skarn at Gumble appears to have followed the paths proposed by Atkinson andEinaudi (1978), andVerkaeran andBartholome (1979), and to some extent, that described by Kwak and Tan (1981), and Ashley (1980). The primary stage involves the alteration of limestone to hedenbergite, andradite, grossular, epidote, idocrase, diopside, wollastonite, and magnetite.…”

Section: Opaline Silica Malayaitesupporting

confidence: 55%

“…Dadak and Novak (1965), Mulligan and Jambor (1968). (Lessing and Standish, 1973;Verkaeren, 1971) and substitution of Sn 4 § for Fe 3 + may further increase strain due to ionic size differences and thus be a contributing factor to the anisotropism.…”

Section: Opaline Silica Malayaitementioning

confidence: 99%

Malayaite and tin-bearing garnet from a skarn at Gumble, NSW, Australia

Mulholland

1984

Mineral. mag.

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Malayaite and tin-bearing garnet occur within a skarn assemblage at Gumble, NSW. A metasomatic origin is proposed for these minerals under conditions of T = 300-500°C Xco2 < 0.30 and fO2 = 10−18 to 10−30 bars. Malayaite has formed as a result of reaction between a metasomatic fluid rich in Sn, F, H2O and silica, and tin-bearing andradite and wollastonite. The main requirements for tin-bearing skarn formation appear to be an F-Sn-rich granite, an iron-rich skarn assemblage, and a relatively long cooling history.

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“…We investigated the fracture of two magnetite [21] and two phonolite [22] cylindrical specimens by constant displacement rate (1 µm/s) uniaxial compression testing. The list of analyzed experiments is reported in Table 1.…”

Section: Experimental Set-up and Resultsmentioning

confidence: 99%

Onset Time Determination of Acoustic and Electromagnetic Emission During Rock Fracture

Niccolini¹,

Xu²,

Manuello³

et al. 2012

PIER Letters

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Abstract-We present an application of the Akaike Information Criterion (AIC ) for an automatic and accurate determination of the acoustic and electromagnetic emission (AE and EME) onset times. The onset time information is used to derive the time delays between correlated AE and EME events from rock specimens during laboratory fracture experiments. The observed correlation in time between AE and EME events is consistent with EME release during microcrack growth. Relevant load drops are accompanied by AE bursts, expected to be generated during macrocracks propagation.

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Petrology of the San Leone magnetite skarn deposit (S.W. Sardinia)

Cited by 16 publications

References 0 publications

An occurrence of ilvaite layers in the Cinco Villas metasomatic rocks, Western Pyrenees (Spain)

An occurrence of ilvaite layers in the Cinco Villas metasomatic rocks, Western Pyrenees (Spain)

Malayaite and tin-bearing garnet from a skarn at Gumble, NSW, Australia

Onset Time Determination of Acoustic and Electromagnetic Emission During Rock Fracture

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