Asimow, Paul D. (1999) A model that reconciles major- and trace-element data from abyssal peridotites. Earth and Planetary Science Letters, 169 (3-4). pp. 303-319. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20120831-110308922
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Abyssal peridotite samples from slow-spreading oceanic ridges have been interpreted as residues of near-fractional melting processes on the basis of trace-element data, whereas major-element compositions and modes of the same samples require interactions between migrating melts and residual solids, either by equilibrium porous flow, refertilization, or olivine crystallization. Modeling of major- and trace-element data shows that these peridotite samples are consistent with a variety of melting and melt migration histories that include elements or episodes both of near-fractional melting and of equilibrium porous flow. A component of equilibrium porous flow explains peridotite compositions better than olivine deposition or refertilization. Mixing of primary basalt liquids composed of variable proportions of unmodified liquid increments extracted by near-fractional melting, and of liquids transported by equilibrium porous flow generates local trend systematics like those observed in fractionation-corrected basalt compositions at slow-spreading ridges. Both the local trend in basalts and the fractionated trace elements in peridotites are absent at the fast-spreading East Pacific Rise, allowing simpler models of melting and melt migration than those required at Atlantic and Indian ridges and implying a spreading-rate or magma-flux dependence to the mechanism of melt extraction.
|Additional Information:||© 1999 Elsevier Science B.V. Received 4 June 1998; revised version received 30 March 1999; accepted 30 March 1999. This paper grew out of discussions with Charlie Langmuir, Ro Kinzler, and Marc Spiegelman. Thanks to Charlie Langmuir for the use of his melting software and fractionation calculations. Mike Baker and John Beckett kindly shared a preprint of their abyssal peridotite manuscript and gave permission to discuss their results in advance of publication. The manuscript benefited from constructive reviews by Peter Kelemen and Rodey Batiza. The author is supported by a postdoctoral research fellowship from Lamont–Doherty Earth Observatory. [FA]|
|Subject Keywords:||peridotites; mid-ocean ridge basalts; mantle; partial melting; segregation|
|Official Citation:||Paul D Asimow, A model that reconciles major- and trace-element data from abyssal peridotites, Earth and Planetary Science Letters, Volume 169, Issues 3–4, 15 June 1999, Pages 303-319, ISSN 0012-821X, 10.1016/S0012-821X(99)00084-9. (http://www.sciencedirect.com/science/article/pii/S0012821X99000849)|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Aucoeur Ngo|
|Deposited On:||31 Aug 2012 18:27|
|Last Modified:||23 Jul 2013 17:49|
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