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The System CaO-MgO-FeO-SiO_2 and its Bearing on the Origin of Ultrabasic and Basic Rocks

Wyllie, Peter J. (1960) The System CaO-MgO-FeO-SiO_2 and its Bearing on the Origin of Ultrabasic and Basic Rocks. Mineralogical Magazine, 32 (249). pp. 459-470. ISSN 0026-461X. doi:10.1180/minmag.1960.032.249.05.

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Experimental data in the system CaO-MgO-FeO-SiO_2 suggest that there may be a plateau on the liquidus and solidus of the multicomponent system basalt-peridotite. If this is so, fusion of peridotite would produce only basaltie magmas over a wide temperature range; when the temperature reached a value such that the liquid crossed the threshold of the plateau, there would be a rapid increase in the amount of fusion for small temperature increases, with the formation of picritic magmas; basaltic magmas containing suspended forsteritic olivine crystals could dissolve them if the temperature rose slightly above that of the plateau threshold; a high proportion of a picritic magma would crystallize in a small temperature interval, with the precipitation of forsteritic olivine that was only slightly zoned. These possibilities are compared with current theories, and it is concluded that several petrological axioms may require critical re-examination. An experimental procedure is outlined to determine the shape of the liquidus and solidus in the basalt-peridotite system.

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Alternate Title:The System CaO-MgO-FeO-SiO2 and its Bearing on the Origin of Ultrabasic and Basic Rocks
Additional Information:© 1960 Mineralogical Society. Read 28 January 1960. Professors E. F. Osborn and W. Q. Kennedy and Drs. H. I. Drever and P. G. Harris kindly offered critical comments.
Issue or Number:249
Record Number:CaltechAUTHORS:20160113-133931655
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63650
Deposited By: Tony Diaz
Deposited On:13 Jan 2016 21:50
Last Modified:10 Nov 2021 23:19

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