Twinning in ‘anorthoclase’ megacrysts from phonolitic eruptions, Erebus volcano, Antarctica

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Twinning in ‘anorthoclase’ megacrysts from phonolitic eruptions, Erebus volcano, Antarctica

Messaggio da Marco E. Ciriotti » sab 01 set, 2018 15:09

Prossima pubblicazione.

Referenza:
▪ Boulliard, J.C. & Gaillou, E. (2019): Twinning in ‘anorthoclase’ megacrysts from phonolitic eruptions, Erebus volcano, Antarctica. European Journal of Mineralogy, 31, (in press).

Abstract:
‘‘Anorthoclase’’, an intermediate member of the high-albite–sanidine alkali feldspar solid solution, is a major component in trachytic and phonolitic lavas. Mount Erebus volcano is well known for its anorthoclase megacrysts which show a range of twin morphologies. Thanks to a set of more than 400 specimens collected by volcanologist Haroun Tazieff, we have revisited and improved the knowledge about the twins from this locality, and documented the crystals’ shapes, sizes and frequencies. The status of the X Carlsbad B twin is revised. Several twins, not yet mentioned from this locality, are identified. Two new types of twins are described and referred to as Erebus and Tazieff twins. The spectacular Erebus twin associates two Carlsbad B twins or one Carlsbad B twin and one single crystal; it is a normal twin with (3-02) as composition plane. The 52° V shaped Tazieff twin is the first example of the corresponding parallel twin of the Manebach twin, with the [205] axis and a composition plane close to (5-02).
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: Twinning in ‘anorthoclase’ megacrysts from phonolitic eruptions, Erebus volcano, Antarctica

Messaggio da Marco E. Ciriotti » mar 26 feb, 2019 13:58

Pubblicazione effettuata.

Referenza:
▪ Boulliard, J.C. & Gaillou, E. (2019): Twinning in ‘anorthoclase’ megacrysts from phonolitic eruptions, Erebus volcano, Antarctica. European Journal of Mineralogy, 31, 99-110.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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