GRAPHICAL ANALYSIS OF THE ORTHOPYROXENE-PIGEONITE-AUGITE-PLAGIOCLASE EQUILIBRIUM AT LIQUIDUS TEMPERATURES AND LOW PRESSURE
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dc.contributor.author | Latypov R.M. | |
dc.contributor.author | Dubrovskii M.I. | |
dc.contributor.author | Alapieti T.T. | |
dc.date.accessioned | 2021-02-22T07:44:18Z | |
dc.date.available | 2021-02-22T07:44:18Z | |
dc.date.issued | 2001 | |
dc.identifier | https://elibrary.ru/item.asp?id=13377209 | |
dc.identifier.citation | American Mineralogist, 2001, 86, 4, 547-554 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/25371 | |
dc.description.abstract | There are both natural and experimental observations of the coexistence of three pyroxenes—orthopyroxene (Opx) + pigeonite (Pig) + augite (Aug)—with plagioclase (Pl). Commonly, the assemblage occurs as an intermediate product in the following fractionation trend of a mafic magma: Opx + Aug + Pl → Opx + Aug + Pig + Pl → Aug + Pig + Pl. To clarify the phase-equilibria constraints on the existence of this mineral assemblage, we have graphically analyzed the change in topology of an isobaric–isoplethic section, Ol–Aug–Pl–Qtz [with fe = 25–50%, where fe = Fe/(Fe + Mg), and An = 50%], arising from an increase in the fe-value of silicate liquid. The analysis shows that the stability field of the mineral assemblage Opx + Aug + Pig + Pl is restricted, and can onlycrystallize in the interval between two invariant points—T41 (Ol + Opx + Pig + Aug + Pl + L) and T42 (Qtz + Opx + Pig + Aug + Pl + L)—that emerge successively during expansion of a liquidus volume of pigeonite within the isobaric–isoplethic section Ol–Aug–Pl–Qtz. At fe-values lower than T41, the 3-pyroxene assemblage cannot exist due to the absence of a contact surface between the primary volumes of plagioclase and pigeonite. At fe-values greater than T42, the assemblage is unstable due to separation of the primary volumes of orthopyroxene and augite. | |
dc.title | GRAPHICAL ANALYSIS OF THE ORTHOPYROXENE-PIGEONITE-AUGITE-PLAGIOCLASE EQUILIBRIUM AT LIQUIDUS TEMPERATURES AND LOW PRESSURE | |
dc.type | Статья |
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