Evidence against the stability of orthoenstatite above ∼1005°C at atmospheric pressure in CaO‐MgO‐SiO 2 | Zendy

Carlson William D. | Zendy

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Evidence against the stability of orthoenstatite above ∼1005°C at atmospheric pressure in CaO‐MgO‐SiO 2

Author(s) -

Carlson William D.

Publication year - 1985

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/gl012i007p00409

Subject(s) - pyroxene , enstatite , diopside , orthorhombic crystal system , atmospheric pressure , atmosphere (unit) , phase (matter) , geology , mineralogy , chondrite , thermodynamics , astrobiology , olivine , physics , optics , meteorite , quantum mechanics , diffraction , oceanography

Reversals locating the equilibrium orthoenstatite = protoenstatite + diopside in CaO‐MgO‐SiO 2 demonstrate that orthoenstatite cannot exist stably above 1005±10°C at one atmosphere pressure. This in turn suggests that the orthorhombic low‐Ca phase found near 1400°C at atmospheric pressure in this system (formerly identified as orthoenstatite) is in fact a previously unrecognized pyroxene polymorph.

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