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首页> 外文期刊>Contributions to Mineralogy and Petrology >Limestone assimilation by basaltic magmas: an experimental re-assessment and application to Italian volcanoes
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Limestone assimilation by basaltic magmas: an experimental re-assessment and application to Italian volcanoes

机译：玄武岩浆对石灰石的吸收作用：实验性重新评估并应用于意大利火山

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摘要

The results of an experimental study of limestone assimilation by hydrated basaltic magmas in the range 1,050–1,150°C, 0.1–500 MPa are reported. Alkali basalts doped with up to 19 wt% of Ca, Mg-carbonates were equilibrated in internally heated pressure vessels and the resulting phase relationships are described. The major effects of carbonate incorporation are: (1) generation of CO2-rich fluid phases; (2) change in liquidus phase equilibria; the crystallization of Ca-rich clinopyroxene is favored and the other phases (e.g. olivine, plagioclase), present in the absence of carbonate assimilation, are consumed. As a consequence of the massive clinopyroxene crystallization, the residual melt is strongly silica-depleted and becomes nepheline-normative. Compositional and mineralogical evolutions observed in Mt. Vesuvius eruptive products match those documented in our experiments with added carbonates, suggesting the possibility that carbonate assimilation increased during the last 25 ka of activity. In Central-Southern Italy, carbonate assimilation at shallow levels probably superimposes on deeper source heterogeneities.
机译：据报道，在1,050–1,150°C，0.1–500 MPa的范围内，水合玄武岩岩浆对石灰石的同化作用的实验研究结果。掺杂了高达19 wt％的Ca的玄武岩，Mg碳酸盐在内部加热的压力容器中达到平衡，并描述了所得的相关系。碳酸盐结合的主要作用是：（1）富CO 2 液相的产生。 （2）液相线平衡的改变；有利于富钙的clinopyroxene的结晶，并且消耗了在没有碳酸盐同化的情况下存在的其他相（例如橄榄石，斜长石）。由于大量的次氯环己烯结晶，残留的熔体被严重消耗掉了二氧化硅，成为霞石规范的。在山中观察到的成分和矿物学演变。维苏威火山喷发产物与我们在实验中记录的碳酸盐添加物相匹配，表明在活动的最后25 ka期间碳酸盐同化作用可能增加。在意大利中南部，浅层碳酸盐同化可能叠加在较深的烃源异质性上。

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