A remarkable suite of Miocene high-silica trondhjemites discovered in the central Trans-Mexican Volcanic Belt indicates that slab melts can ascend through the mantle and crust while suffering only minor compositional modifications. Despite carrying an assortment of deep crustal xenoliths, the trondhjemites preserve the most depleted isotopic compositions ever measured in the Mexican arc, with values that are nearly identical to those of the Pacific mid-oceanic-ridge basalts. These rocks also have high Sr/Y ratios, and extremely fractionated heavy rare earth element patterns at relatively high Mg number (Mg#), features that are all consistent with melts from the subducted oceanic crust that had only limited interaction with mantle peridotite during ascent. Nonetheless, modeling results indicate that these unusual geochemical features can be modified by more extensive mantle assimilation, resulting in compositions that could match those of more typical intermediate rocks from Mexico. The data thus indicate that the slab melt component uniquely recorded by the Miocene trondhjemites represents a likely constituent for most volcanic sequences of the Mexican arc, and suggest that a modern andesitic continental crust can be constructed directly from mantle-modified slab melts without a basaltic precursor.
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Univ Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, MexicoUniv Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, Mexico
Ramirez-Bautista, Aurelio
Sites, Jack W., Jr.
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Austin Peay State Univ, Dept Biol, Clarksville, TN 37044 USAUniv Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, Mexico
Sites, Jack W., Jr.
Marshall, Jonathon C.
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Weber State Univ, Dept Zool, Ogden, UT 84408 USAUniv Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, Mexico
Marshall, Jonathon C.
Cruz-Elizalde, Raciel
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Univ Nacl Autonoma Mexico, Fac Ciencias, Museo Zool Alfonso L Herrera, Ciudad De Mexico, MexicoUniv Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, Mexico
Cruz-Elizalde, Raciel
Diaz-Marin, Cesar A.
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Univ Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, MexicoUniv Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, Mexico
Diaz-Marin, Cesar A.
Hernandez-Salinas, Uriel
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Inst Politecn Nacl, CIIDIR Unidad Durango, Durango, MexicoUniv Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, Mexico
Hernandez-Salinas, Uriel
Berriozabal-Islas, Christian
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Univ Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, MexicoUniv Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, Mexico
Berriozabal-Islas, Christian
Garcia-Rosales, Aaron
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Univ Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, MexicoUniv Autonoma Estado Hidalgo, Ctr Invest Biol, Inst Ciencias Basicas & Ingn, Lab Ecol Poblac, Km 4-5 Carretera Pachuca Tulancingo, Mineral De La Reforma 42184, Hidalgo, Mexico
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Univ Complutense Madrid, Dept Fis La Tierra Astron & Astrofis 1, Fac CC Fis, E-28040 Madrid, SpainUniv Complutense Madrid, Dept Fis La Tierra Astron & Astrofis 1, Fac CC Fis, E-28040 Madrid, Spain
Ruiz-Martinez, V. C.
Urrutia-Fucugauchi, J.
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Univ Nacl Autonoma Mexico, Inst Geofis, Lab Palaeomagnetismoy Palaeoambientes, Mexico City 04510, DF, MexicoUniv Complutense Madrid, Dept Fis La Tierra Astron & Astrofis 1, Fac CC Fis, E-28040 Madrid, Spain
Urrutia-Fucugauchi, J.
Osete, M. L.
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Univ Complutense Madrid, Dept Fis La Tierra Astron & Astrofis 1, Fac CC Fis, E-28040 Madrid, SpainUniv Complutense Madrid, Dept Fis La Tierra Astron & Astrofis 1, Fac CC Fis, E-28040 Madrid, Spain
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Univ Complutense Madrid, Fac Ciencias Geol, C Jose Antonio Novais 12, Madrid 28040, SpainUniv Nacl Autonoma Mexico, Ctr Geociencias, Posgrad Ciencias Tierra, Blvd Juriquilla 3001, Queretaro 76230, Mexico