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Multi-isotope and geochemical approach to the magma source and tectonic setting of Proterozoic anorthosite massifs and AnorthositeMangerite-Charnockite-Granite(AMCG)suites

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Geoscience Frontiers 2024年第6期15卷 2-21页

作者： L.A.Elizondo-Pacheco L.A.Solari R.González-Guzmán H.L.He E.Becerra-Torres J.A.Ramírez-Fernández R.Maldonado Posgrado en Ciencias de la Tierra Instituto de GeocienciasUniversidad Nacional Autónoma de MéxicoSantiago de Querétaro 76230Mexico Instituto de Geociencias Universidad Nacional Autónoma de MéxicoSantiago de Querétaro 76230Mexico Departamento de Geología División de Ciencias de la TierraCICESEEnsenada 22860Mexico School of Earth Sciences Yunnan UniversityKunming 650500PR China Yunnan International Joint Laboratory of Critical Mineral Resource Kunming 650500PR China Escuela Nacional de Estudios Superiores Unidad Juriquilla Universidad Nacional Autónoma de MéxicoSantiago de Querétaro 76230México Facultad de Ciencias de la Tierra Universidad Autónoma de Nuevo LeónLinares 67700Mexico Instituto de Geología Universidad Nacional Autónoma de MéxicoCiudad de México 04510Mexico

The occurrence of massif-type anorthosite intrusions is a widespread Proterozoic *** are usually associated with gabbroic,charnockitic,and granitic rocks,comprising the so-called anorthositemangerite-charnockite-granite(AMCG)*** these rocks have been extensively studied worldwide,several aspects concerning their formation remain *** them,the magma source and the tectonic setting are the most *** evaluate these issues,we first compiled geochemical and isotopic data of Proterozoic anorthosite massifs and AMCG suites worldwide and stored it in a database named *** plethora of data allows us to make some important *** argue that the wide-ranging multi-isotopic composition of this group of rocks reflects varying proportions of juvenile mantle-derived melts and crustal *** interpret that the precursor magmas of most massive anorthosite bodies and associated mafic rocks have a mantle-dominated ***,we highlight that a crustal component is indispensable to generate these *** variable amounts of this material during succeeding multi-stage assimilation-fractional crystallization(AFC)processes gives these intrusions their typical mantle-crustal hybrid isotopic *** contrast,a crustaldominant origin with a complementary mantle component is interpreted for most MCG *** summary,the isotopic information in datAMCG indicates that both sources are necessary to generate AMCG ***,we suggest that hybridized magmas with different mantle-crust proportions originate these *** interpretation might offer a more nuanced and accurate depiction of this phenomenon in future work instead of choosing a single-sourced model as in the past ***,tectonomagmatic diagrams suggest that the rocks under study were likely generated in a tectonic environment that transitioned between collision and post-collisional extension,sometimes involving subduction-modified ma

关键词： Massif-type anorthosite Anorthosite-granite suite Magmatic sources hybridized magmas Tectonic setting Post-orogenic extension

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