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首页> 外文期刊>Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry >Geochemical and isotope data from the Acatlan Volcanic Field,western Trans-Mexican Volcanic Belt:Origin and evolution
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Geochemical and isotope data from the Acatlan Volcanic Field,western Trans-Mexican Volcanic Belt:Origin and evolution

机译：跨墨西哥西部火山带阿卡特兰火山场的地球化学和同位素数据：起源与演化

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摘要

The Quaternary Acatlan Volcanic Field(AVF)is located at the western edge of the Trans-Mexican Volcanic Belt(TMVB).This region is related to the subduction of the Pacific Cocos and Rivera plates beneath the North American plate since the late Miocene.AVF rocks are products of Pleistocene volcanic activity and include lava flows,domes,erupted basaltic andesite,trachyandesite,trachydacite,and rhyolite of calc-alkaline affinity.Most rocks show depletion in high field-strength elements and enrichment in large ion lithophile elements and light rare earth elements as is typical for magmas in subduction-related volcanic arcs.~(87)Sr/~(86~)Sr values range from 0.70361 to 0.70412,while eNd values vary from +2.3 to +5.2.Sr-Nd isotopic data plot along the mantle array.On the other hand,lead isotope compositions(~(206)Pb/~(204)Pb=l8.62-18.75,~(207)Pb/~(204)Pb=l5.57-15.64,and ~(208)Pb/~(204)Pb=38.37-38.67)give evidence for combined influences of the upper mantle,fluxes derived from subducted sediments,and the upper continental crust involved in magma genesis at AVF.Additionally delta~(18)O whole rock analyses range from +6.35(per thousand)in black pumice to +10.9%c in white pumice of the Acatlan Ignimbrite.A fairly good correlation is displayed between Sr as well as O isotopes and SiO_2 emphasizing the effects of crustal contamination.Compositional and isotopic data suggest that the different AVF series derived from distinct parental magmas,which were generated by partial melting of a heterogeneous mantle source.
机译：第四纪的阿卡特兰火山场（AVF）位于跨墨西哥火山带（TMVB）的西边缘，该区域与中新世晚期以来太平洋板块与太平洋板块在北美板块之下的俯冲有关。岩石是更新世火山活动的产物，包括熔岩流，穹顶，玄武质安山岩，菱锰矿，菱锰矿和流纹岩，具有钙-碱性亲和力。与俯冲有关的火山弧中岩浆的典型地球元素。〜（87）Sr /〜（86〜）Sr值范围从0.70361到0.70412，而eNd值从+2.3到+5.2不等.Sr-Nd同位素数据图另一方面，铅同位素组成（〜（206）Pb /〜（204）Pb = l8.62-18.75，〜（207）Pb /〜（204）Pb = l5.57-15.64，和〜（208）Pb /〜（204）Pb = 38.37-38.67）提供了上地幔，俯冲沉积物产生的助熔剂的综合影响的证据ts和AVF上涉及岩浆成因的上部大陆壳。另外，δ〜（18）O整体岩石分析范围从黑色浮岩的+6.35（千分之一）到阿卡特兰Ignimbrite的白色浮岩的+ 10.9％c。锶和氧同位素与SiO_2之间显示出良好的相关性，强调了地壳污染的影响。组成和同位素数据表明，不同的AVF系列是由不同的母岩浆产生的，这些母岩浆是通过不同地幔源的部分熔融而产生的。

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