顺拉系(二叠系)参考剖面:地球化学特征

Q4 Earth and Planetary Sciences Litosfera Pub Date : 2018-12-28 DOI:10.24930/1681-9004-2018-18-6-819-838
G. Mizens, R. Sungatullin, G. Sungatullina, B. Gareev, G. Batalin, F. F. Sadriev
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引用次数: 1

摘要

对象。考虑了位于西乌拉尔前深南部的Dal 'ny Tulkas和Mechetlino剖面岩石的地球化学特征,并将其作为Artinskian和Kungurian阶段下边界全球对比(GSSP)的国际标准。材料和方法。对Dalnii Tyulkas剖面和Mechetlino剖面的15个和20个碳酸盐、粘土和砂质岩石样品进行了造岩氧化物和其他组分的含量研究。岩石化学成分的测定使用了S8 Tiger (Bruker, Germany)的波色散x射线荧光光谱仪。结果。测定了各剖面的岩性特征,以及萨克森—阿廷斯基界线和阿廷斯基—昆古里界线泥岩和灰岩中氧化物的含量。不同阶段泥岩主要组分的平均含量基本相同,而灰岩则有一定差异。分析了各氧化物之间的相关联系,得出了岩石矿物组成的结论。利用石油化学模型和图解,确定了考虑剖面的粘土岩主要由水云母组成。通过对化学风化CIA指标的分析,认为该时期的气候以干旱为主。结论:所研究的两个剖面岩石的主要岩石化学特征有所不同,但岩石化学参数几乎无法区分每个剖面的地层分区边界。这可能表明,在该地区的顺苏拉纪的几个世纪的边界上,沉积的连续性是有益的。在拆迁地区的沉积条件和侵蚀岩石的性质保持相对不变。当将这些章节视为全球相关国际标准(GSSP)参考对象——“金钉子”时,这是一个积极的观点。
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Reference sections OF Cisuralian Series (Permian System): geochemical features
Object.Geochemical features of rocks from the Dal’ny Tulkas and Mechetlino sections located in the southern part of the West Urals foredeep are considered and are offered as International Standards for the global correlation (GSSP) of the lower boundaries of the Artinskian and Kungurian stages.Materials and methods.The content of rock-forming oxides and other components were studied for 15 and 20 samples of carbonate, clay and sandy rocks respectively in the sections of Dalnii Tyulkas and Mechetlino. The determination of the chemical composition of rocks was performed using a wave-dispersive X-ray fluorescence spectrometer S8 Tiger (Bruker, Germany). Results. The lithological characteristics of the sections, the content of oxides in mudstones and limestones of the boundary Sakmarian-Artinskian and of the boundary ArtinskianKungurian are taken. Mudstones of different stage are almost identical in average contents of the main components, whereas limestones have some differences. Correlative connections of oxides are analyzed and conclusions about mineral composition of rocks are made. Using the petrochemical modules and diagrams, it was established that the clay rocks in considered sections have mainly a hydromica composition. Based on the analysis of the indices of chemical weathering CIA, it is shown that the climate in the Cisuralian Epoch was predominantly arid. The tectonic environment of forming demolition sources, presumably corresponded to the active and passive margins of the continents.Conclusions.The main lithochemical characteristics of the rocks of the two sections under consideration are somewhat different, however, the boundaries of the stratigraphic subdivisions of each of them are virtually indistinguishable by lithochemical parameters, which may indicate the benefit of the continuity of sedimentation at the borders of centuries of the Cisuralian Epoch in this region. The conditions of sedimentation and the nature of eroded rocks in the area of demolition remained relatively constant. This is a positive point when looking the sections as International Standards for the global correlation (GSSP) reference objects – “golden nails”. 
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Litosfera
Litosfera Earth and Planetary Sciences-Geophysics
CiteScore
0.70
自引率
0.00%
发文量
39
审稿时长
12 weeks
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