Rb Sr systematics and crustal contamination models for calc-alkaline igneous rocks |
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| Authors: | Louis Briqueu Joël R Lancelot |
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| Institution: | Laboratoire de Géochimie Isotopique, Centre Géologique et Géophysique, Universitédes Sciences et Techniques du Languedoc, Place E. Bataillon, 34060 Montpellier Cedex France |
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| Abstract: | New strontium isotopic data of calc-alkaline Pliocene-to-Quaternary lavas (southern Peru) confirm their anomalous isotopic composition compared to those of calc-alkaline rocks from active margins where continental crust is not involved. Gradual enrichment of radiogenic Sr occurs during fractional crystallization of calc-alkaline magma. The variation of the isotopic composition of these lavas as well as87Sr/86Sr versus 1/(86Sr) diagrams form the basis for a model involving processes of fractional crystallization combined with mixing and addition of radiogenic Sr that originated in continental crust and was transported by a fluid phase. |
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