Chuvashova I.S. 1,2, R. Alokla1,3, S.V. Rasskazov1,2
1Irkutsk State University, Faculty of Geology, Irkutsk, Russia
2Institute of the Earth's Crust SB RAS, Irkutsk, Russia
3University of Aleppo, Aleppo, Syria
Chuvashova Irina Sergeevna,
Candidate of Geology and Mineralogy,
664003 Irkutsk, Lenina str., 3,
Irkutsk State University, Geological Faculty,
assistant professor,
664003 Irkutsk, Lermontov str., 128,
Institute of Earth’s crust of SB RAS,
Senior Researcher,
tel.: (3952) 51–16–59,
email: chuvashova@crust.irk.ru.
Alokla Riyad,
664003 Irkutsk, Lenina str., 3,
Irkutsk State University, Geological Faculty,
master's student,
Aleppo, Syria,
University of Aleppo,
lecturer,
email: riyad.198762@gmail.com.
Rasskazov Sergei Vasilevich,
Doctor of Geology and Mineralogy, Professor,
664003 Irkutsk, Lenina str., 3,
Irkutsk State University, Geological Faculty,
Head of the Dynamic Geology Chair,
664033 Irkutsk, Lermontov, 128,
Institute of Earth’s crust of SB RAS,
Head of the Laboratory for isotopic and geochronological studies,
tel.: (3952) 51–16–59,
email: rassk@crust.irk.ru.
Abstract. Clay tonsils mark permeable porous boundaries of basaltic flows. Poor penetration of water is expressed in local occurrence of smectite-sepiolite tonsils with admixtures of halloysite and polygorskite. Increasing water infiltration that results in complete filling of pores and cavities in basalts by the same clay minerals is accompanied by the entry of a goethite admixture. Mature weathering crust on basalts is characterized by smectite-goethite composition without sepiolite. The cryptic clay mineralization of permeable basalt layers might result in overestimating ages in K-Ar system and distortion of primary geochemical signatures of volcanic rocks.
Keywords: сlay minerals, smectite, sepiolite, halloysite, polygorskite, goethite, basalt.
P. 16–26
Belov I.V. Trachybasalt formation of Pribaikalya, 1963. — 372 p.
Volkolakov F.K., Khlystov P.A. On the presence of hydrargillite in the Paleogene (?) crust of weathering of the Tunka depression // Materials on geology and mineral depozits of Buryat ASSR. — Issue II. Ulan-Ude, 1967. — P. 51–53.
Ginzburg I.I., Rukavishnikova I.A. Minerals of the old crust of weathering in Ural — M., 1951. — 715 p.
Mirahmedov M. Materialnyj soda zhelvakovo-gravelistykh phosphoritov // Bulletin of Uzbek Branch VMO, 1987. — Issue 40. — P.134.
Rasskazov S.V. [et al.] Pyroclastics as an indicator of the rise of the Ikat Range relative to the Barguzin Depression of the Baikal Rift Zone // Geography and Natural Resources, 2016. — No. 5. — P. 117–127.
Rasskazov S.V. Magmatism of the Baikal Rift System. — Novosibirsk: VO «Nauka». Siberian publishing firma, 1993. — 288 p.
Rasskazov S.V., Tikhonova G.A., Nartova N.V. On findings of clay tonsils in Neogene basalts from Eastern Sayans // Applied Mineralogy of Eastern Siberia. – Irkutsk: Irkutsk University Publishing House, 1992. – P. 168–181.
X-ray methods of studying and the structure of clay minerals / Ed. G. Brown. – M., 1965. – 599 p.
Serdyuchenko Ya.P. Magnesian paragalluasites and other montmorillonite minerals from Jurassic sediments in North Caucasus // Problems of petrography and mineralogy, 1953. — V. 2. M. — P. 100–122.
Thermal analysis of minerals and rocks. — L., 1974. — 399 p.
Chukhrov F.V. Colloids in the Earth's crust. — M., 1955. — 586 p.
Khlystov P.A., Dekhtyareva L.V. The main stages of Meso-Cenozoic planation and weathering crust in Western Transbaikalia // Matereals on geol. And industrial forces of Buryat ASSR. — Issue XIII. — Ulan-Ude: Buryat Book Publisher, 1970. P. 50–57.
Differential thermal analysis.– Vol. 1. L. N.-Y.: Academic press. 1970.– 775 p.
Chuvashova I.S. Infiltration of clay into pores and cavities of Neogene basalts from Eastern Sayans [Electronic resource] / I.S. Chuvashova, R. Alokla, S.V. Rasskazov // Geology and Environment.— 2021.— V. 1, No. 1.— P. 16–26. DOI 10.26516/2541-9641.2021.1.16
Access Mode: http://geoenvir.ru/archive/g&e21-1-1/chuvashova17-1.htm (09.12.2021).