Origin and physical-chemical control of topaz crystallization in felsic igneous rocks: Contrasted effect of temperature on its OH–F substitution

Soufi, Mohamed

doi:10.1016/j.earscirev.2020.103467

Cited by 12 publications

(1 citation statement)

References 182 publications

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“…In addition, the generally accepted origin of the topaz from the Greifenstein granite as a late phase must be scrutinized because the diamond, graphite, SiC, cristobalite, and coesite inclusions in topaz imply a different formation of this topaz type. Note that such hydroxyl-rich topaz has been identified in ultrahigh-pressure metamorphic rocks [22].…”

Section: Natural Diamond and Moissanite In Inclusions In Granitementioning

confidence: 92%

Ultrahigh-Pressure Mineral Inclusions in a Crustal Granite: Evidence for a Novel Transcrustal Transport Mechanism

Thomas¹,

Davidson²,

Rericha³

et al. 2023

Preprint

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We previously described spherical crystals in minerals from prismatine-bearing rock from Waldheim, including ultrahigh-pressure (UHP) minerals such as stishovite and coesite, in uncommon crustal environments. To determine if this was an outlier phenomenon, we searched for equivalent inclusions in other rocks, which we indeed discovered in a Variscan tin granite sensu stricto from the Erzgebirge. The identification of more examples of this phenomenon implies a novel, very rapid transcrustal transport mechanism, which however is not unique. We demonstrate the unusual occurrence of UHP minerals (moissanite, diamond, lonsdaleite, stishovite, coesite, kumdykolite, and cristobalite-II) in topaz of granitic rocks, which reflects the direct interaction of mantle and crust via supercritical fluids or extremely volatile-rich melts. Most UHP minerals are tiny inclusions in moissanite. The trapping by this mineral prevents a fast reaction in an extraneous environment.

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Section: Natural Diamond and Moissanite In Inclusions In Granitementioning

confidence: 92%