Some geological and petrological characteristics of the Eocene trachybasalt-trachyandesite- basalt-phonolite formation of the Talysh zone (Azerbaijan)

Keywords: Talysh zone, Eocene volcanism, geodynamic regimes, igneous complexes, mineral assemblages


This article discusses the stages of crystallization of the Eocene trachybasalt-tra- chyandesitebasalt-phonolith formation of the Talysh zone. Determination of the composi- tion of the primary magma, evolution and melting fraction of the initial melt of the Eocene volcanism of the Talysh zone within Azerbaijan. Eocene volcanism of the trachybasalt-tra-chyandesitebasalt-phonolith formation of the Talysh zone. Petrographic, petrochemical, geochemical studies of rocks, typomorphic features of mineral paragenesis, chemical composition of rocks were carried out by X-ray spectral and X-ray fluorescence analysis. The analyzes of the conducted studies show that the Talysh zone was formed in the Eocene time. Stages of evolution of the original magma and typomorphic features of mineral parageneses have been established. The distributions of microelements in mineral parageneses, which are direct participants in the crystallization processes that took place in intermediate chambers at different depths, have been studied. At present, the question arises of the need to clarify the typomorphic features of igneous complexes, as factors that determine the geodynamic regimes of their formation, and to determine the potential ore content. The petrographic and petrochemical characteristics of the volcanic rocks are given. It was found that if the process of differentiation in the Early-Middle Eocene was more distinct with the initial formation of more magnesian rock varieties (picrite-trachybasalts), and subsequently more ferruginous ones (trachyandesites and trachyandesitebasalts), then such accumulation of iron is not observed in porphyritic trachyandesites. This petrochemical feature is obviously associated with the duration of the break in volcanism, caused by the formation of a thick sedimentary-tuffaceous stratum, accompanied by the initiation and manifestation of an intermediate chamber of medium composition. Volcanism in the Late Eocene was undifferentiated and was not accompanied by the formation of medium differences. The appearance in the late Eocene of leucite phonolites, which represent an alkaline branch, and the absence of transitional varieties indicate the autonomous development of vit- robasalts and leucite phonolites. It is concluded that from the early phases of the manifestation of Eocene volcanism to the later phases, the change in the material composition along the lateral is expressed in the manifestation of more alkaline facies with a significant predominance of K over Na and with a greater correspondence to the differentials of the shoshonite series.

Author Biography

Vagif. M Karimov
Azerbaijan State University of Oil and Industry, Azerbaijan Republic


1. Aliyev, R.E., Babaev, N.I., Mamedov, M.N. (2009). Geo- logicheskoe stroenie i magmatizm Talysh-Taromskoj zony. [Geological structure and magmatism of the Talysh-Tarom zone]. Baku. Publishing house AGNA. 168 p. (In Russian).
2. Azizbekov, Sh.A., Bagirov, A.E., Ismail-zade, A.D. (1971). Tektonicheskoe stroenie Talysha i ego svyaz’ s El’bursom i Malym Kavkazom. [Tectonic structure of the Talysh and its connection with Elburs and the Lesser Caucasus]. Geotectonics. 3, 74-86. (In Russian).
3. Azizbekov, Sh.A., Bagirov, A.E., Veliev, M.M., Ismail-za- de, A.D., Nizheradze, N.Sh., Emelyanova, E.N., Ma- medov, M.N. (1979). Geologiya i vulkanizm Talysha. [Geology and volcanism of the Talysh]. Baku: Elm. 244 p. (In Russian).
4. Geologiya Azerbajdzhana. (2001). [Geology of Azerbaijan] Ed. Academician A.A. Alizadeh. Baku: Nafta- Press. T.3. Magmatism. 434 p. (In Russian).
5. Geologiya Azerbajdzhana. (2005) [Geology of Azerbai- jan]. Ed. Academician A.A. Alizadeh. Baku: Nafta- Press. T. 4. Tectonics. 505 p. (In Russian).
6. Imamverdiyev N.A. (2003). Rare Earth Element Geo- chemistry of Late Cenozoic Volcanic Series in the Lesser Caucasus. Geochemistry International. 41, 4, 379-394
7. Imamverdiyev, N.A., Gasanguliyeva, M., Karimov, V.M., Karimli, U.İ. (2020). Petrogeochemical features of the Neogene collision volcanism of the Lesser Caucasus (Azerbaijan). Journ. Geol. Geogr. Geoecol. – Dnipro, 29 (2), 289–303. DOI
8. Imamverdiyev, N.A., Gasankuliyeva, M.Y., Babayeva, G.C., Abdullayeva, Sh.F., Veliyev, A.A., (2018). Petro- genesis of the Late Cenozoic volcanism of the central part of the Lesser Caucasus (Azerbaijan). Russian Ge- ology and Geophysics, Elsevier, 1, 42-55. Retrieved from:
9. Imamverdiyev, N.A., Valiyev, A.A. (2021). Updates in Vol- canology – Transdisciplinary Nature of Volcano Sci- ence, Edited by Károly Németh. Chapter 3. Late Ce- nozoic Collisional Volcanism in the Central Part of the Lesser Caucasus (Azerbaijan). London, United King- dom, “Intech open”, 43-70. Retrieved from: http://dx.
10. Karimov, V.M. (2020). Usloviya generacii subshch- elochnyh i shchelochnyh bazal’toidnyh serij Talysha. [Conditions for the generation of subalkaline and al- kaline basaltoid series in the Talysh. Ural Geological Journal. 3 (135), 35-43. (In Russian).
11. Karimov, V.M. (2007). Petrologiya i mineral’nyj para- genezis trahibazal’t-trahiandezibazalt-fonolitovoj formacii Talyshskoj zony. [Petrology and mineral para- genesis of the trachybasalt-trachyandesite-basalt-pho- nolite formation of the Talysh zone]. Avtoref. Dis ... Cand. geol.-min. sciences. Baku. 22 p. (In Russian).
12. Karimov, V.M., (2016). Geologicheskie. usloviya formiro- vaniya trahibazal’t-trahiandezibazal’t-fonolitovoj for- macii Talyshskoj zony (Azerbajdzhan). [Geological. conditions for the formation of trachybasalt-basalt trachyandesite-phonolite formation of the Talysh zone (Azerbaijan)]. Ecoenergetika NTZh. 4, 50-55. (In Rus- sian).
13. Karimov, V.M. (2020). Mineral’nye paragenezisy i stadijnost’ kristallizacii pozdnemelovyh i eocenovyh mag- maticheskih kompleksov Malogo Kavkaza i Talysha. [Mineral parageneses and stages of crystallization of the Late Cretaceous and Eocene magmatic complexes of the Lesser Caucasus and Talysh]. Uralskii Geolog- ich. Journal. 5 (137), 50-58. (In Russian).
14. Kazymova, S.E., Kazymov, I.E. (2020). Geodinamika Talyshskogo regiona po dannym mekhanizmov ocha- gov zemletryasenij i GPS-stancij. [Geodynamics of the Talysh region according to the data of earthquake focal mechanisms and GPS-stations]. Geology and geo- physics of the South of Russia. 10 (3). 40 – 56. DOI: 10.46698 / VNC.2020.35.39.003 (In Russian).
15. Khain V.E. (1975). The main stages of the tectonic-mag- matic development of the Caucasus. Experience of geodynamic interpretation. Geotectonics, 1, 13-27.
16. Kogarko, L.N. 1998. SHCHelochnoj magmatizm v rannej istorii Zemli. [Alkaline magmatism in the early history of the Earth]. Petrol, vol. 6. 3, 251-258. (In Russian).
17. Le Bas, M.J., Le Maitre, R.W., Streckeisen, A., Zanettin, B. (1968). A chemical classification of volcanic rocks based on the total alkali-silica (TAS) diagram. Journal Petrology, 27, 745–750.
18. Mamedov, M.N., (1999). Petrologiya i geohimiya pozd- nemelovyh i eocenovyh magmaticheskih formacij Malogo Kavkaza i Talysha. [Petrology and geochemistry of the Late Cretaceous and Eocene magmatic formations of the Lesser Caucasus and Talysh]. Baku. 400 p. (In Russian).
19. Mamedov, M.N., Babaeva, G.D., Karimov, V.M. (2017). Klinopirokseny v processe formirovaniya subshch- elochnoj olivin-bazal’tovoj magmy Talyshskoj zony Kavkaza. [Clinopyroxenes during the formation of subalkaline olivine-basaltic magma of the Talysh zone of the Caucasus]. Ural Geological Journal. 5 (119), 39- 54. (in Russian).
20. Mamedov, M.N., Babaeva, G.D., Panakhi, K.A., Karimov, V.M. (2007). Mantijnyj metasomatizm i nekotorye vo- prosy generacii subshchelochnyh i shchelochnyh bazal’toidnyh serij Malogo Kavkaza. [Mantle metasoma- tism and some issues of generation of subalkaline and alkaline basaltoid series in the Lesser Caucasus]. In the book: «Problematic issues of geodynamics, petrology and metallogeny of the Caucasus». proceedings of the scientific session. – dedicated to the 100th anniversary of the birth of academician Sh.A. Azizbekov, 186-196. (In Russian).
21. Mamedov, M.N., Babaeva, G.D., Purmukhtari, M.A., Keri- mov, V.M. (2006). Nekotorye geologo-petrologicheskie voprosy usloviya generacii i evolyucii shchelochnyh i subshchelochnyh serij Malogo Kavkaza, Talysha i Urmiya-Dohtar. [Some geological and petrological issues of generation and evolution of alkaline and subalkaline series of the Lesser Caucasus, Talysh and Ur- mia-Dokhtar]. Bulletin of Baku University, 3, 91-98.
22. Pilchin, A.N., Eppelbaum, L.V. (2020). Plate tectonics and earth evolution: a conceptual revive. ANAS Transac- tions, Earth Sciences, Geology and geophysics. 2, 3-32.
23. Rustamov, M.I. (1995). Tektonicheskoe polozhenie Talyshskoj skladchatoj zony v Malokavkaz-El’bursskoj sisteme. [Tectonic position of the Talish fold zone in the Lesser Caucasus-Elbursk system]. Proceedings of the Institute of Geology of the Academy of Sciences of Azerbaijan. 195-209. (In Russian).
24. Rustamov, M.I. (2005). YUzhnokaspijskij bassejn: geo- dinamicheskie sobytiya i processy. [South Caspian Basin: Geodynamic Events and Processes]. Baku.- «Nafta-Press». 344 p. (In Russian).
25. Ryabchikov, I.D., 1988. Geohimicheskaya evolyuciya mantii Zemli. [Geochemical evolution of the Earth’s mantle]. Moscow, «Science», 34 p. (In Russian).
26. Sun, S.S., McDonough, W.F. (1989). Chemical and iso- topic systematics of oceanic basalts; implications for mantle composition and processes. Geological Society special publication, 12, 313-345.
27. Van der boon, A., Kuiper, K.F., Villa, G., Renema, W. (2015). Onset of Maikop sedimentation and cessation of Eocene arc volcanism in the Talysh Mountains, Azerbaijan. Geological Society, London, Special Pub- lications. V. 428, 145-69.
28. Van der boon, A., Kuiper, K.F., Villa, G., Renema, W. (2015). Onset of Maikop sedimentation and cessation of Eocene arc volcanism in the Talysh Mountains, Azerbaijan. Geological Society, London, Special Pub- lications. V. 428, 145-69.
29. Vincent, St, Allen, M, Ismail-Zadeh, A, Flecker, R. (2005). The Paleogene evolution and sedimentary fill of the South Caspian Basin: insights from the Talysh of the Southern Azerbaijan. American Geological Survey, 1513-1533.
30. Yoder, H.S., Tilley, C.E. (1962). Origin of basalt magmas: an experimental study of natural and synthetic rock systems. J. Petrol. 3, 342-352.
How to Cite
Karimov, V. (2022). Some geological and petrological characteristics of the Eocene trachybasalt-trachyandesite- basalt-phonolite formation of the Talysh zone (Azerbaijan). Journal of Geology, Geography and Geoecology, 31(3), 484-492.