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首页> 外文期刊>Contributions to Mineralogy and Petrology >Subduction cycling of volatiles and trace elements through the Central American volcanic arc: evidence from melt inclusions
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Subduction cycling of volatiles and trace elements through the Central American volcanic arc: evidence from melt inclusions

机译：通过中美洲火山弧的挥发物和微量元素的俯冲循环：熔体包裹体的证据

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摘要

Compositions of melt inclusions in olivine (Fo90-64) from 11 localities in Guatemala, Nicaragua and Cost Rica along the Central American Volcanic Arc are used to constrain combined systematics of major and trace elements and volatile components (H2O, S, Cl, F) in parental melts and to estimate volcanic fluxes of volatile elements. The melt inclusions cover the entire range of compositions reported for whole rocks from Central America. They point to large heterogeneity of magma sources on local and regional scales, related to variable contributions of diverse crustal (from the subducting and overriding plates) and mantle (from the wedge and incoming plate) components involved in magma genesis. Water in parental melts correlates inversely with Ti, Y and Na and positively with Ba/La and B/La (with the exception of Irazú Volcano), which indicates mantle melting fluxed by Ba-, B- and H2O-rich, possibly, serpentinite-derived fluid beneath most parts of the arc. Different components with melt-like characteristics (high LREE, La/Nb and probably also Cl, S and F and low Ba/La) control the geochemical peculiarities of Guatemalan and Costa Rican magmas. The composition of parental magmas together with published data on volcanic volumes and total SO2 flux from satellite measurements are used to constrain fluxes of volatile components and to estimate total magmatic flux in Central America. We found that volcanic flux accounts for only 13% of total magmatic and volatile fluxes. The remaining 87% of magmas remained in the lithosphere to form cumulates (∼39%) and intrusives (∼48%). The intrusive fraction of magmatic flux may be significantly larger beneath Nicaragua compared to Costa Rica. Interestingly, total fluxes of magmas and volatiles in Central America are quite similar to the global average estimates.
机译：中美洲火山弧沿线的危地马拉，尼加拉瓜和哥斯达黎加的11个地区的橄榄石熔岩夹杂物（Fo 90-64 ）的组成用于约束主要和微量元素以及挥发性成分的组合系统（母体熔体中的H 2 O，S，Cl，F）并估算挥发性元素的火山​​通量。熔体包裹体涵盖了中美洲整个岩石报道的全部成分。他们指出，在局部和区域尺度上，岩浆来源存在很大的异质性，这与岩浆成因所涉及的不同地壳成分（来自俯冲板块和上覆板块）和地幔组分（来自楔形板块和传入板块）有关。母体熔体中的水与Ti，Y和Na呈负相关，与Ba / La和B / La（与Irazú火山除外）呈正相关，这表明由Ba-，B-和H 2引起的地幔融化。在弧的大多数部分下方富含O的，可能是蛇纹石来源的流体。具有熔体状特征的不同组分（高LREE，La / Nb以及可能的Cl，S和F以及低Ba / La）控制着危地马拉和哥斯达黎加岩浆的地球化学特征。母岩浆的组成以及来自火山测量的火山体积和SO 2 总通量的公开数据被用来约束挥发性组分的通量，并估计中美洲的岩浆总通量。我们发现，火山通量仅占岩浆和挥发性通量的13％。剩余的87％岩浆保留在岩石圈中，形成堆积物（〜39％）和侵入物（〜48％）。与哥斯达黎加相比，尼加拉瓜以下的磁通量侵入分量可能更大。有趣的是，中美洲的岩浆和挥发物总通量与全球平均估计值非常相似。

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