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Magmatic processes at the volcanic front of Central Mexican volcanic belt: Sierra de Chichinautzin volcanic field (Mexico)

机译:中部墨西哥火山带的火山岩浆岩浆作用过程:墨西哥塞纳拉德奇亚努奇津火山场

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摘要

The Sierra de Chichinautzin (SCN) volcanic field is considered one of the key areas to understand the complex petrogenetic processes at the volcanic front of the Mexican Volcanic Belt (MVB). New as well as published major- and trace-element and Sr and Nd isotopic data are used to constrain the magma generation and evolution processes in the SCN. From inverse and direct modelling, combined 87Sr/86Sr and 143Nd/144Nd data, and use of multi-dimensional log-ratio discriminant function based diagrams and other geological and geophysical considerations, we infer that mafic magmas from the SCN were generated by partial melting of continental lithospheric mantle in an extensional setting. Inverse modelling of primary magmas from the SCN further indicates that the source region is not depleted in high-field strength elements (HFSE) compared to large ion lithophile elements (LILE) and rare-earth elements (REE). The petrogenesis of evolved magmas from the SCN is consistent with the partial melting of the continental crust facilitated by influx of mantle-derived magmas. Generally, an extensional setting is indicated for the SCN despite continuing subduction at the Middle America Trench.
机译:Chichinautzin山脉(SCN)火山场被认为是了解墨西哥火山带(MVB)火山前沿复杂的成岩过程的关键区域之一。新的和已发布的主要元素和痕量元素以及Sr和Nd同位素数据用于约束SCN中的岩浆生成和演化过程。从逆向建模和直接建模,结合87Sr / 86Sr和143Nd / 144Nd数据以及使用基于多维对数比判别函数的图表以及其他地质和地球物理考虑因素,我们可以推断出SCN的镁铁质岩浆是由SCN的部分融化产生的大陆岩石圈地幔处于伸展环境。来自SCN的原岩浆反演进一步表明,与大型离子亲石元素(LILE)和稀土元素(REE)相比,高场强元素(HFSE)中的源区没有耗尽。 SCN演化出的岩浆的成岩作用与地幔源性岩浆的涌入促进了大陆壳的部分融化。通常,尽管在中美洲海沟继续俯冲,但SCN仍显示了扩展设置。

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