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Position of Rocks of Riftogenic and Collisional Sedimentary Sequences on Different Paleogeodynamic Diagrams
Geochemistry International ( IF 0.8 ) Pub Date : 2021-02-21 , DOI: 10.1134/s0016702921020051
A. V. Maslov , V. N. Podkovyrov

The distribution of composition fields of syn-rift and syncollisional sandstones and fine-grained clastic/clayey rocks of various structures and different ages are compared on the SiO2–K2O/Na2O, F1–F2, and DF1–DF2 diagrams. Syn-rift sedimentary sequences fill intraplate rifts, rifts at divergent, conservative and convergent plate boundaries, as well as their triple junctions. Syncollisional sediments are referred to rocks of foredeep and intermontane troughs, which are made up of molasses proper, flysch and schliers, and volcanogenic and nonfolded (distal) molasses. Fields of syn-rift and syncollisional sandstones in the SiO2–K2O/Na2O diagram show significant overlap. In the F1–F2 and DF1–DF2 diagrams, the distribution of the fields of syn-rift and syncollisional fine-grained clastic/clayey rocks is also substantially similar. Hence, the above mentioned diagrams cannot be used for reliable discrimination between syn-rift and syncollisional terrigenous associations. Correspondingly, it is hardly possible to use these diagrams alone for determination of geodynamic nature of sediments.



中文翻译:

裂谷沉积和沉积序列在不同古地球动力学图中的位置

在SiO 2 –K 2 O / Na 2 O,F1–F2和DF1–DF2图上比较了同分裂和共生砂岩,不同结构和不同年龄的细粒碎屑/粘土岩石的成分场分布。。同层裂谷沉积序列充满板内裂谷,在发散,保守和收敛板块边界处的裂谷,以及它们的三重交界处。碰撞共生沉积物指的是前深槽和山间槽的岩石,它们由适当的糖蜜,粉煤灰和切屑,以及火山成因的和非褶皱的(远端)糖蜜组成。SiO 2 –K 2 O / Na 2中的同裂隙和旋生砂岩场O图显示出明显的重叠。在F1-F2和DF1-DF2图中,同心裂谷和共生细粒碎屑/粘土岩石场的分布也基本相似。因此,上面提到的图不能用于同裂隙和晕厥陆生联系之间的可靠区分。相应地,几乎不可能单独使用这些图表来确定沉积物的地球动力学性质。

更新日期:2021-02-22
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