The role of crustal and eruptive processes versus source variations in controlling the oxidation state of iron in Central Andean magmas
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- 作者：Stephanie B. Grockea ; b ; GrockeS@si.edu" class="auth_mail" title="E-mail the corresponding author ; Elizabeth Cottrella ; Shanaka de Silvab ; Katherine A. Kelleyc
- 关键词：Central Andean volcanic zone ; crustal assimilation ; oxygen fugacity ; subduction ; wet chemistry
- 刊名：Earth and Planetary Science Letters
- 出版年：2016
- 出版时间：15 April 2016
- 年：2016
- 卷：440
- 期：Complete
- 页码：92-104
- 全文大小：1722 K
文摘
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fO2s recorded by CVZ basaltic andesites bracket those of dacites and rhyolites.
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Crustal assimilation/melting of 30–100% does not systematically oxidize magmas.
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Crystal fractionation does not systematically oxidize magmas.
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Basaltic andesite fO2s increase systematically with increasing La/Nb.
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Greater influence from the subducting slab elevates fO2.