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首页> 外文期刊>Contributions to Mineralogy and Petrology >A petrologic, geochemical and Sr-Nd isotopic study on contact metamorphism and degassing of Devonian evaporites in the Norilsk aureoles, Siberia
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A petrologic, geochemical and Sr-Nd isotopic study on contact metamorphism and degassing of Devonian evaporites in the Norilsk aureoles, Siberia

机译：岩石，地球化学和Sr-Nd同位素研究西伯利亚Norilsk aureoles中泥盆纪蒸发物的接触变质作用和脱气

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摘要

Devonian evaporites and associated sedimentary rocks in the Norilsk region were contact metamorphosed during emplacement of mafic sills that form part of the end-Permian (~252 Ma) Siberian Traps. We present mineralogical, geochemical and Sr-Nd isotopic data on sedimentary rocks unaffected by metamorphism, and meta-sedimentary rocks from selected contact aureoles at Norilsk, to examine the mechanisms responsible for magma-evaporite interaction and its relation to the end-Permian environmental crisis. The sedimentary rocks include massive anhydrite, rock salt, dolostone, calcareous siltstones and shale, and the meta-sedimentary rocks comprise calcareous hornfels, siliceous hornfels and minor meta-anhydrite and meta-sandstone. Contact metamorphism took place at low pressure and at maximum temperatures corresponding to the phlogopite-diopside stability field. Calcareous hornfels have high CaO, MgO, CO_2, SO_3, low SiO_2 and initial Sr isotopic ratios of 0.7079-0.7092, features indicative of calcareous siltstone protoliths. Siliceous hornfels, in contrast, have high SiO_2, Al_2O_3, Na_2O, low in other major element oxides and initial Sr isotopic ratios of 0.7083-0.7152, consistent with pelitic or shaley protoliths.
机译：泥盆纪的蒸发岩和相关的沉积岩在诺里尔斯克地区发生了接触变质作用，而这些沉积物是构成二叠纪末世（约252 Ma）西伯利亚圈闭一部分的镁铁质基岩的。我们提供了不受变质作用影响的沉积岩石的矿物学，地球化学和Sr-Nd同位素数据，以及来自Norilsk选定的接触金针的变质沉积岩的数据，以研究造成岩浆-蒸发岩相互作用的机理及其与末次二叠纪环境危机的关系。 。沉积岩包括块状硬石膏，盐岩，白云岩，钙质粉砂岩和页岩，而准沉积岩包括钙质角，石，硅质角and石和次要硬石膏和偏砂岩。接触变质发生在低压和最高温度下，对应于金云母-透辉石的稳定性场。钙质角f具有高的CaO，MgO，CO_2，SO_3，低的SiO_2和初始Sr同位素比为0.7079-0.7092，这些特征表明钙质粉砂岩原岩。相反，硅质角f具有高SiO_2，Al_2O_3，Na_2O，其他主要元素氧化物含量低和初始Sr同位素比为0.7083-0.7152，这与胶粒或页岩原生质一致。

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