东欧地台与乌拉尔褶皱交界处含金刚石流质岩

V. A. Dushin, S. G. Sustavov, D. Prokopchuk, E. N. Volchek
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引用次数: 0

摘要

研究课题。对建立在西乌拉尔逆冲断层(西尔瓦河源头)与前乌拉尔海槽Yuryuzano-Sylva坳陷东翼交界处的西尔瓦流爆杂岩进行了特征分析。材料和方法。作者在GSA200/2页O-40-XXIX (Shalinskaya Ploshchad)的研究工作中收集的材料,以及在优先2030联邦计划的工作中收集的材料。利用了西乌拉尔主逆冲影响区内的地质、岩石化学、岩石学、构造和构造位置的碎屑岩组合数据。实验数据使用TESCAN VEGA LMS电子显微镜获得,该显微镜配备了Xplore 30能量色散x射线光谱头,URS-55 x射线单元(乌拉尔国立矿业大学),以及CPM-35和Shimadzu EDX-8000光谱仪和XRD-7000衍射仪(俄罗斯科学院乌拉尔分院扎瓦里茨基地质和地球化学研究所地球分析中心)。结果。首次建立了Sylva流控杂岩含金刚石岩石的矿物学、岩石学和化学组成。用XRD测定了所研究岩石中所含的金刚石和矿物(苯胺、安钙等)。岩石的矿物学特征表明其可能是流体-岩浆成因,包括辅助矿物(金刚石含量指示物)、椭球状和泪滴状火山玻璃的存在,以及火成岩和沉积岩的体块分散和未分类的松散碎片。结论。研究结果表明,研究区存在早中生代潜水火山作用的可能,并导致了西尔瓦金刚石杂岩及其附属矿物被流质岩转移。
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Diamond-bearing fluidolites in the junction area of East European Platform and Urals fold region
Research subject. To characterize the Sylva fluidogenic-explosive complex, which was established in the junction area of the West Ural thrust megazone (head of the Sylva River) and the eastern wing of the Yuryuzano-Sylva depression of the Pre-Ural trough. Materials and methods. The authors' materials collected during research works at GSA200/2 sheet O-40-XXIX (Shalinskaya Ploshchad), as well as those collected during the work under the Priority 2030 Federal Program, were used. Data on the geology, petrochemistry, petrography, structural and tectonic position of clastogenic rock associations in the area of influence of the Main West Ural thrust were employed. Experimental data were obtained using a TESCAN VEGA LMS electron microscope equipped with an Xplore 30 energy dispersive X-ray spectroscopic prefix, and an URS-55 X-ray unit (Ural State Mining University), as well as CPM-35 and Shimadzu EDX-8000 spectrometers and an XRD-7000 diffractometer (Geoanalitik Centre, Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences). Results. For the first time, the mineralogical-petrographic and chemical compositions of diamond-bearing rocks of the Sylva fluidogenic complex were established. Diamonds and minerals contained in the studied rocks were determined by XRD (sanidine, analcime, etc.). The conducted analysis of the rocks suggests their possible fluid-magmatic genesis, which is indicated by mineralogical features, including accessory minerals-indicators of diamond content, the presence of ellipsoid and teardrop-shaped volcanic glass, finely-dispersed bulk and poorly-rolled unsorted fragments of igneous and sedimentary rocks. Conclusions. The results obtained indicate the possibility of manifestation of Early Mesozoic phreatic volcanism in the studied area, which led to the transfer of the Sylva diamond complex and accessory minerals by fluidolites.
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