Chromium-bearing clays in altered ophiolitic rocks from Crommyonia (Soussaki) volcanic area, Attica, Greece

Mitsis, Ioannis; Γοδελίτσας, Α.; Göttlicher, Jörg; Steininger, Ralph; Gamaletsos, P.; Perraki, Maria; Abad-Ortega, M.M.; Stamatakis, Michael G.

doi:10.1016/j.clay.2018.06.016

Cited by 10 publications

(15 citation statements)

References 43 publications

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“…If so the post-eruptive hydrothermal flux would probably have been manifest in fumarolic activity ( cf . Mitsis et al ., 2018). We contend that the Weaklaw phenomena may have been triggered by late Carboniferous (or Early Permian (?)…”

Section: Discussionmentioning

confidence: 99%

“…Mitsis et al . (2018) also noted an enrichment in LILE (specifically Rb and Ba) in Cr-bearing clays from altered ophiolitic rocks in Greece. In the Weaklaw schlieren chromium reaches its highest concentration in the <2 μm clay fraction (Table 2).…”

Section: Mantle Xenolithsmentioning

confidence: 92%

“…This suggests that the spinels probably preserve their primary mantle composition. Spinel has been reported to show comparable resistance to complete dissolution in the altered peridotites of Crommyonia (Greece) (Mitsis et al ., 2018) and also in the ultramafic enclaves at Almaden (Spain) (Morata et al ., 2001).

Fig.…”

Section: Mantle Xenolithsmentioning

confidence: 99%

“…Mitsis et al . (2018) note that Cr-bearing clays produced by metasomatic alteration of ultramafic rocks can be highly enriched in a range of elements including V and Sc. However, the increases in Rb, Ba, Zr, Nb, Pb and light rare earth elements ( LREE ), relative to their concentrations in the (supposed fresh analogue) peridotite, are attributed to their introduction by the metasomatising agent.…”

Section: Whole-rock Compositional Changes Due To Metasomatismmentioning

confidence: 99%

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The Weaklaw Vent, SE Scotland: Metasomatism of eruptive products by carbo-hydro-fluids of probable mantle origin

Upton

Odling

Kirstein

et al. 2019

MinMag

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The Weaklaw vent in SE Scotland (East Lothian coast), inferred to be Namurian, produced lava spatter and volcanic bombs. The latter commonly contained ultramafic xenoliths. All were metasomatised by carbonic fluids rich in incompatible elements. The lavas and xenoliths are inferred to have been basanites and lherzolites prior to metasomatism. The abundance and size of (carbonated) peridotite xenoliths at Weaklaw denotes unusual rapidity of magma ascent and high-energy eruption making Weaklaw exceptional in the British Isles. The lavas and xenoliths were altered subsequently by low-temperature (<200°C) carbo-hydrous fluids to carbonate, clay and quartz assemblages. A small irregular tuffisite ‘dyke’ that transects the ejecta is also composed dominantly of carbonates and clays. The peridotitic xenoliths are typically foliated, interpreted as originating as pre-entrainment mantle shear-planes.Analyses of the relic spinels shows them to be compositionally similar to spinels in local unaltered lherzolites from near-by basanitic occurrences. Chromium showed neither significant loss nor gain but was concentrated in a di-octahedral smectite allied to volkonskoite. It is in the complex association of smectite with other clays, chlorite and possibly fuchsite that the diverse incompatible elements are concentrated.We conclude that late Palaeozoic trans-tensional fault movement caused mantle shearing. Rapid ascent of basanite magma entrained large quantities of sheared lithospheric mantle. This was followed by ascent of an aggressive carbonate-/ hydroxyl-rich fluid causing pervasive metasomatism. The vent is unique in several ways: in its remarkable clay mineralogy and in displaying such high Cr-clays in a continental intra-plate setting; in being more productive in terms of its ‘cargo’ of peridotite xenoliths; in presenting an essentially un-eroded sequence of Namurian extrusives; and, not least, for giving evidence for post-eruptive, surface release of small-melt, deep-source fluids.

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Section: Discussionmentioning

confidence: 99%

Section: Mantle Xenolithsmentioning

confidence: 92%

Fig.…”

Section: Mantle Xenolithsmentioning

confidence: 99%

Section: Whole-rock Compositional Changes Due To Metasomatismmentioning

confidence: 99%

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The Weaklaw Vent, SE Scotland: Metasomatism of eruptive products by carbo-hydro-fluids of probable mantle origin

Upton

Odling

Kirstein

et al. 2019

MinMag

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“…On the other hand, some toxic element tend to be trapped in insoluble secondary minerals that form also in such acidic environments. For example, Pb and Ba may be incorporated in low-solubility sulfates (Cánovas et al, 2016) or As, Se, V and Tl in clays (Mitsis et al, 2018).…”

Section: Environmental Impactmentioning

confidence: 99%

Impact of hydrothermal alteration processes on element mobility and potential environmental implications at the Sousaki solfataric field (Corinthia - Greece)

D’Alessandro

Calabrese

Bellomo

et al. 2020

Journal of Volcanology and Geothermal Research

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Samples of efflorescences and encrustations of hydrothermal origin have been collected at Sousaki (Greece) and were analysed for their mineralogical (XRD) and chemical composition. Solutions obtained both from mineralization with HNO3 and from leaching with deionised water were analysed for major (ICP-OES), minor and trace metals (ICP-MS) and sulfate contents (IC). Results evidence the dependence of the chemical and mineralogical composition on micro-environmental conditions i.e. humidity, oxygen-rich or-poor environment, exposed or sheltered from meteoric agents. In fact, the presence of highly soluble sulfate minerals with elevated contents of many metals (e.g. Mg, Al, Fe, Mn, Cr, Ni, etc.) further underscores the important influence of hydrothermal activity on elements' mobility, whilst the sometimes very high concentrations in toxic elements like Al, Cr, Ni evidence also possible environmental impacts.

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Polytypism in semi-disordered lizardite and amesite by low-dose HAADF- STEM

Zhang¹,

Zarzycki²,

Gilbert³

et al. 2020

Preprint

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Chromium-bearing clays in altered ophiolitic rocks from Crommyonia (Soussaki) volcanic area, Attica, Greece

Cited by 10 publications

References 43 publications

The Weaklaw Vent, SE Scotland: Metasomatism of eruptive products by carbo-hydro-fluids of probable mantle origin

The Weaklaw Vent, SE Scotland: Metasomatism of eruptive products by carbo-hydro-fluids of probable mantle origin

Impact of hydrothermal alteration processes on element mobility and potential environmental implications at the Sousaki solfataric field (Corinthia - Greece)

Polytypism in semi-disordered lizardite and amesite by low-dose HAADF- STEM

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