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首页> 外文期刊>The American mineralogist >Mineralogical, geochemical, and textural indicators of crystal accumulation in the Adamello Batholith (Northern Italy)
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Mineralogical, geochemical, and textural indicators of crystal accumulation in the Adamello Batholith (Northern Italy)

机译：Adamello Batholith中的矿床，地球化学，地球化学和质地指标（北意大利北部）

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摘要

In this study, we quantitatively investigate crystal-melt segregation processes in two upper-crustal, intermediate-to-silicic plutons from the Tertiary Adamello Batholith, Italian Alps, by combining (1) an estimation of the amount of crystallized interstitial liquid using cathodoluminescence images, phase maps, and mass-balance calculations with (2) quantification of crystal preferred orientation using electron backscatter diffraction. Cathodoluminescence images, phase maps, and plagioclase profiles are used together to distinguish early grown primocrysts from overgrowths formed after the rheological "lock-up" of the magma bodies. Mass-balance calculations, taking into account mineral compositions and bulk-rock chemistry, are used as an additional means to quantify the amount of trapped melt. The following features are indicative of crystal accumulation (or melt loss) in some parts of the batholith: (1) The amount of crystallized interstitial liquid can be low and negatively correlated with crystal (and shape) preferred orientations. Locally, up to ca. 27% melt may have been lost. (2) Significant intracrystalline deformation in plagioclase (up to ca. 13 degrees of lattice distortion) is present in strongly foliated samples, resulting from compaction in a highly crystalline mush. These mineralogical and textural features indicative of variability in the degree of crystal accumulation in some areas of the Adamello batholith may explain the highly scattered bulk-rock geochemical patterns (particularly in trace elements). However, the precise quantification of the amount of melt loss remains challenging in felsic plutons, because of the compositional deviation from liquid lines of descent due to multi-scale variations in the degree of crystal-melt segregation and the fact that magmatic textures indicative of crystal accumulation can be subtle.
机译：在本研究中，我们通过组合（1）使用阴极发光图像的结晶式间质液体的估计来定量地研究两种上层地壳，中间到型芦苇中的晶体熔体分离过程。使用电子反向散射衍射的（2）用（2）晶体优选取向的量程计算，相位映射和质量平衡计算。阴极发光图像，相位图和Plagioclase曲线一起使用，以区分从岩浆体的流变“锁定”之后形成的过度生长的早期生长的雷晶。考虑矿物组合物和体岩化学的质量平衡计算用作量化被捕获的熔体量的附加手段。以下特征在于底座的某些部件中表示晶体积聚（或熔体损失）：（1）结晶间质液的量可以低且与晶体（和形状）优选取向负相关。在本地，到达CA. 27％的融化可能已经丢失了。 （2）在强烈的叶片样品中存在显着的Plagioclase（最多Ca.13的晶格变形）中的显着的脑啡肽变形。这些矿物学和纹理特征，指示Adamello Batholith的一些区域中的晶体积聚程度的变异可以解释高度散射的体岩地球化学图案（特别是在微量元素中）。然而，熔体损失量的精确定量仍然在肠型钚中挑战，因为由于晶体熔体偏析程度的多尺度变化以及岩浆纹理指示晶体的多尺度变化，因此由于来自液体的组成偏差以及表示晶体的岩石纹理的组成偏差积累可能是微妙的。

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