DOI: 10.1144/sjg03010067. Formation and fractionation of basic magmas at high pressures

Formation and fractionation of basic magmas at high pressures

10.1144/sjg03010067

Crossref journal-article

Geological Society of London

Scottish Journal of Geology (1881)

Abstract

Synopsis Experiments were conducted at 30 kilobars on dry synthetic mixtures in the join diopside (CaMgSi 2 O 6 )-pyrope (Mg 3 Al 2 Si 3 O 12 ), on a small number of compositions in adjacent parts of the plane CaSiO 3 -MgSiO 3 -Al 2 O 3 and one composition in the plane diopside-pyrope-forsterite. In addition, experiments were made at the same pressure on the joins chrome diopside-enstatite, chrome diopside-pyrope, and chrome diopside-pyrope-olivine using the separated analysed minerals of a natural garnet-peridotite nodule in kimberlite, and the join garnet-omphacite using the separated analysed minerals of an eclogite nodule in kimberlite. A few experiments were made on the whole-rock sample of some eclogite nodules in kimberlite. The results have an important bearing on the range ofcomposition of clinopyroxene solid solutions, the conditions of equilibration and original formation of eclogite and kimberlite, and the existence of an orthopyroxene-liquid reaction relationship in olivine and hypersthene-normative liquids at 30 kilobars pressure. They lead to the construction of a new fractionation scheme at high pressure in which a hypersthene-normative picrite or olivine tholeiite magma is the primary liquid, formed by partial melting of a garnet-peridotite mantle. Precipitation of garnets and clinopyroxenes (eclogite accumulates) leads to me development of alkaline and silica-poor mafic magmas from this primary liquid.

Bibliography

OâHara, M. J., & Yoder, H. S. (1967). Formation and fractionation of basic magmas at high pressures. Scottish Journal of Geology, 3(1), 67â117.

Authors 2

M. J. O’Hara (first)
H. S. Yoder (additional)

References 51 Referenced 295

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Dates

Type	When
Created	15 years, 7 months ago (Jan. 14, 2010, 7:29 p.m.)
Deposited	9 months, 2 weeks ago (Nov. 19, 2024, 11:27 a.m.)
Indexed	3 months ago (June 6, 2025, 10:29 p.m.)
Issued	58 years, 8 months ago (Jan. 1, 1967)
Published	58 years, 8 months ago (Jan. 1, 1967)
Published Online	3 years, 3 months ago (June 7, 2022)
Published Print	58 years, 8 months ago (Jan. 1, 1967)

Funders 0

None

BibTeX

@article{O_Hara_1967, title={Formation and fractionation of basic magmas at high pressures}, volume={3}, ISSN={2041-4951}, url={http://dx.doi.org/10.1144/sjg03010067}, DOI={10.1144/sjg03010067}, number={1}, journal={Scottish Journal of Geology}, publisher={Geological Society of London}, author={O’Hara, M. J. and Yoder, H. S.}, year={1967}, month=jan, pages={67–117} }

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  "abstract": "<jats:title>Synopsis</jats:title>\n          <jats:p>\n            Experiments were conducted at 30 kilobars on dry synthetic mixtures in the join diopside (CaMgSi\n            <jats:sub>2</jats:sub>\n            O\n            <jats:sub>6</jats:sub>\n            )-pyrope (Mg\n            <jats:sub>3</jats:sub>\n            Al\n            <jats:sub>2</jats:sub>\n            Si\n            <jats:sub>3</jats:sub>\n            O\n            <jats:sub>12</jats:sub>\n            ), on a small number of compositions in adjacent parts of the plane CaSiO\n            <jats:sub>3</jats:sub>\n            -MgSiO\n            <jats:sub>3</jats:sub>\n            -Al\n            <jats:sub>2</jats:sub>\n            O\n            <jats:sub>3</jats:sub>\n            and one composition in the plane diopside-pyrope-forsterite. In addition, experiments were made at the same pressure on the joins chrome diopside-enstatite, chrome diopside-pyrope, and chrome diopside-pyrope-olivine using the separated analysed minerals of a natural garnet-peridotite nodule in kimberlite, and the join garnet-omphacite using the separated analysed minerals of an eclogite nodule in kimberlite. A few experiments were made on the whole-rock sample of some eclogite nodules in kimberlite. The results have an important bearing on the range ofcomposition of clinopyroxene solid solutions, the conditions of equilibration and original formation of eclogite and kimberlite, and the existence of an orthopyroxene-liquid reaction relationship in olivine and hypersthene-normative liquids at 30 kilobars pressure. They lead to the construction of a new fractionation scheme at high pressure in which a hypersthene-normative picrite or olivine tholeiite magma is the primary liquid, formed by partial melting of a garnet-peridotite mantle. Precipitation of garnets and clinopyroxenes (eclogite accumulates) leads to me development of alkaline and silica-poor mafic magmas from this primary liquid.\n          </jats:p>",
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