Melting of crustal xenoliths within ascending basalt: Example from the Kula volcanic field,western Anatolia,Turkey |
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Authors: | Hasan Bayhan Erkan Aydar Erdal Sen Alain Gourgaud |
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Institution: | 1. Hacettepe University, Department of Geological Engineering, 06532, Beytepe, Ankara, Turkey;2. UMR–CNRS 6524, université Blaise-Pascal, 5, rue Kessler, 63038 Clermont-Ferrand, France |
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Abstract: | During its storage or ascent, basaltic magma inevitably interacts with the surrounding rocks. In this study, schist xenoliths incorporated within ascending basalt are examined. Heating of the xenoliths combined with decompression effect of rapid magma uprise led to dehydration melting of hydrous minerals producing hercynitic spinel, melt, sillimanite and Fe![/>Ti oxides. The melt is rhyolitic, strongly peraluminous (1.77<!-- --> <!-- --><<!-- --> <!-- -->A/CNK<!-- --> <!-- --><<!-- --> <!-- -->2.35) and corundum normative. It may contain up to 8 wt%FeO<sub>t</sub>. It occurs between the foliation planes and in the intragranular environment. Dehydration melting of micas in the schist is probably related to combined effects of heating by basaltic magma and decompression due to the rapid rise. Melting of xenoliths was a progressive process at low pressure. <strong><em>To cite this article: H. Bayhan et al., C. R. Geoscience 338 (2006).</em></strong></td>
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Keywords: | Xenolith melting Hercynite Rhyolitic glass Vesicles Fusion de xénolithes Hercynite Verre rhyolitique Vésicules |
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