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首页> 外文期刊>Contributions to Mineralogy and Petrology >Intrusion of shoshonitic magmas at shallow crustal depth: T-P path, H2O estimates, and AFC modeling of the Middle Triassic Predazzo Intrusive Complex (Southern Alps, Italy)
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Intrusion of shoshonitic magmas at shallow crustal depth: T-P path, H2O estimates, and AFC modeling of the Middle Triassic Predazzo Intrusive Complex (Southern Alps, Italy)

机译：浅地壳深度的肖龙岩浆的侵入：T-P路径，H2O估计和中间三叠纪预测侵入性复杂的AFC建模（南阿尔卑斯州，意大利）

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The multi-pulse shoshonitic Predazzo intrusive complex represents an ideal igneous laboratory for investigating the chemical and physical conditions of magma emplacement in a crustal context, since numerical models can be constrained by field evidence. It constitutes the most intriguing remnant of the Middle Triassic magmatic systems of the Dolomitic Area (Southern Alps), preserved by the Alpine tectonics. Predazzo Intrusive Complex comprises silica saturated (pyroxenites/gabbros to syenites), silica undersaturated (gabbros to syenites), and silica oversaturated (granites and syenogranites) rock suites. In this paper, we modeled its emplacement and evolution with a multiple thermo-/oxy-barometric, hygrometric, and EC-AFC approach. At odds with what proposed in literature but according to the field evidence, the emplacement of the Predazzo Intrusive Complex occurred at shallow depth ( 6 km). In this context, the different pulses differed slightly in bulk water content, but shared a common thermal regime, with temperatures between 1000 and 1100 A degrees C and similar to 600 A degrees C at low-to-moderate oxidizing conditions (- 0.1 to + 0.7 Delta FMQ). The interaction between the intrusion and the shallow crustal rocks was minimal, with Sr and Nd isotopic compositions indicating an average of 5-6% assimilation of crust. A thermo- and oxy-barometric comparison with the nearby Mt. Monzoni also enabled to speculate about the solidification time of the intrusion, which we infer took place over about 700 ka.
机译：多脉冲型血管预测侵入式复合物代表了用于研究地壳背景下的岩浆施加的化学和物理条件的理想火成实验室，因为数值模型可能受到现场证据的限制。它构成了由高山构造保存的白云岩区域（南部阿尔卑斯州）的中间三叠岩岩浆系统的最有趣残余物。预先侵入性复合物包含二氧化硅饱和（斑岩纤维/杂志），二氧化硅欠饱和（Gabbros至Syenites），和二氧化硅过饱和（花岗岩和Syenogranites）岩套。在本文中，我们用多种热/氧 - 气压，湿度测定和EC-AFC方法建模了其施加和进化。根据文献中提出的措施，但根据现场证据，浅层侵入性复合物的施加在浅深度（6公里）。在这种情况下，不同的脉冲在散装水含量中略微不同，但共享常见的热调节，温度在1000至1100℃之间，并且在低至中等氧化条件下（ - 0.1至+）。 0.7三角形FMQ）。侵入和浅地壳岩之间的相互作用最小，具有Sr和Nd同位素组合物，表明平均壳体的含量为5-6％。与附近的MT.Monzoni的热和氧音测定比较也能够推测入侵的凝固时间，我们推断出约700 ka。

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