Material composition of the basalt-trachyte series of the early Devonian of the Saralin graben-rift

9th All Russian petrographic conference with international participation: Petrology of magmatic and metamorphic complexes

Grinev, O.M.^1 ; Grinev, R.O.^1 ; Bogorodov, A.A.^1 ; Adylbaev, R.R.^1

National Research Tomsk State University, Tomsk, Russia^1

关键词: Block structures;    Genetic relationships;    Geochemical data;    Industrial potentials;    Material compositions;    Recycling process;    Structural links;    Tectonic process;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/110/1/012007/pdf
DOI  :  10.1088/1755-1315/110/1/012007

来源: IOP

【 摘 要 】

The article clarifies the structural-tectonic position of the Saralin graben. It is determined that, along with the Balyksinsky graben located to the south and the Goryachegorsky volcanic plateau to the north, they are the connecting structural links between the Kuznetsk-Alatau alkaline province and the adjacent Minusinsk trough. In the early Devonian, the alkaline province was formed as a vaulted-block structure (the "shoulder" of the rift), and the Minusinsk deflection as a depression with the dominant volcanism in it. The boundary between these positive and negative structures was the deep Balyksinsko-Saralinsky fault. In the stratigraphic section of the graben, the lower molassoid part (Ustkundustylskaya stratum), the middle trachybasaltoid stratum (Bazarskay) and the upper problematic Ashpanian stratum are distinguished. In addition to analcime basalts, a large extrusive-subvolcanic dome-shaped construction of trachytes is considered. By petrographic and material composition, volcanites of graben are represented by the dominant basalt-trachyte series in the composition of basanites, trachybasalts, trachyandesites, trachytes. The rocks of the basalt-andesibasalt-andesite series are limited. Foidites are rare. Geochemical data indicate the genetic relationship of the volcanics of the studied series. Geochemically, they are clearly specialized in Sc, Ti, Zn, Zr, Th, U, Mn and P. According to the content of some of these elements, the rocks may have an industrial potential. In geodynamic and genetic plans, graben and its volcanics were formed during plume-tectonic processes involving mantle plume, enriched mantle, and recycling processes of these formations with the substance of the consolidated PR-PZ1cortex.