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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Sr, Nd, and Pb isotopic evidence for the origin and evolution of the Cantaro-Colima volcanic chain, Western Mexican Volcanic Belt
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Sr, Nd, and Pb isotopic evidence for the origin and evolution of the Cantaro-Colima volcanic chain, Western Mexican Volcanic Belt

机译：Sr，Nd和Pb同位素证据表明西墨西哥火山带Cantaro-Colima火山链的起源和演化

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摘要

We report new geochemical and Sr, Nd, and Pb radiogenic isotope data on Pleistocene to Recent subalkaline, basanite-minette, and mixed alkaline magmas from the Cantaro-Colima volcanic chain in the western part of the Mexican Volcanic Belt (MVB). All rocks from this area, including the basanites and minettes, show enrichment in L1LE (e.g., Cs, Ba, and Sr) and depletion in HFSE (e.g., Ta and Ti), generally considered to be a characteristic of subduction-related magmas. The isotopic ratios of Cantaro-Colima rocks show the following ranges:~(87) Sr/~(86)Sr 0.70282-0.70395, ~(143)Nd/~(144)Nd 0.51282-0.51305, ~(206)Pb/~(204)Pb 18.54-18.70, ~(207)Pb/~(204)Pb 15.53-15.61, and ~(208)Pb/~(204)Pb 38.09-38.52. The most mafic basaltic andesite from Volcan Cantaro is isotopically the most depleted rock, similar to MORB and oceanic basalts from seamounts in the adjacent oceanic basins. It has the least radiogenic Sr and Pb and the most radiogenic Nd yet measured from any locality in the MVB. The combined geochemical and isotopic evidence is compatible with the generation of both alkaline and subalkaline magmas of the Cantaro-Colima volcanic chain in the mantle wedge by fluid-transport to the mantle from the subducted plate. The isotopic data are also generally consistent with the actual physical mixing of subalkaline and alkaline basanite-minette magmas to generate intermediate alkaline magmas. The geochemical and isotopic data from the western part of the MVB, including the Cantaro-Colima volcanic chain, however, also reflect the tectonic complexity of simultaneously ongoing subduction and rifting, requiring more complex petrogenetic processes and a chemically and isotopically heterogeneous mantle.
机译：我们从墨西哥火山带（MVB）西部的Cantaro-Colima火山链向最近的亚碱性，重碱铁矿碎屑和混合碱性岩浆报告了更新世的新地球化学和Sr，Nd和Pb放射性同位素数据。该地区的所有岩石，包括basanite和minettes，都表现出L1LE富集（例如Cs，Ba和Sr）和HFSE贫化（例如Ta和Ti），通常被认为是俯冲相关岩浆的特征。 Cantaro-Colima岩石的同位素比显示以下范围：〜（87）Sr /〜（86）Sr 0.70282-0.70395，〜（143）Nd /〜（144）Nd 0.51282-0.51305，〜（206）Pb /〜 （204）Pb 18.54-18.70，〜（207）Pb /〜（204）Pb 15.53-15.61和〜（208）Pb /〜（204）Pb 38.09-38.52。火山岩Cantaro的镁铁质玄武质安山岩是同位素最枯竭的岩石，类似于MORB和邻近海盆海山的玄武岩。从MVB的任何位置测量，它的放射源Sr和Pb最少，放射源Nd最多。地球化学和同位素的综合证据与从俯冲板向地幔的流体运移与地幔楔中Cantaro-Colima火山链的碱性岩浆和亚碱性岩浆的生成是相容的。同位素数据通常也与亚碱性和碱性basanite-minette岩浆的实际物理混合产生中间碱性岩浆一致。然而，来自MVB西部（包括Cantaro-Colima火山链）的地球化学和同位素数据也反映了同时进行的俯冲和裂谷作用的构造复杂性，这需要更复杂的成岩过程以及化学和同位素异质的地幔。

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