Published November 2020, Pg. 13-20
Section: Geology and geophysics
UOT: 551.243
DOI: 10.37474/0365-8554/2020-11-13-20
Advanced data on stratigraphy and lithology of Mio-Pliocene sediments of North Absheron folded zone of western border of South Caspian
Ch.M. Khalifa-zade Dr. in Geol.-Min. Sc - Azerbaijan State University of Oil and Industry
North Absheron folded zone is closely located to Turan plate and separated from Turkmenbashy-Predcaucasus deep fault. However, North Absheron folded zone has a complicated geological structure; local structures here are of platform character, unlike in the west and north-west part of the region, where formation of the sediments of Mio-Pliocene and Cretaceous-Paleogene stages became significantly complicated due to the high hypsometric state of the surface of Mesozoic folding and the increase of regional and interstratified washaways and bracits as well. The paper specifies the stratigraphy of Mio-Pliocene stages within the west part of the region in the structures of Absheron group, Agburun-deniz and Iki-gardash, marking the absence of the sediments of lower part of Productive Series. Due to the new findings of mactra fauna, the washaway of significant part of the Upper Miocene (Pontian, Miotice and Upper Sarmatian) has been justified. According to the fauna remains and the mineralogical-petrographic composition of Absheron group rocks, only Sarmatian and Chokrak sediments from the Miocene stage outcrop in the sections of deep wells, which unconformable occur in the aleurite-clay series of Maikop stage.
The Lower Pliocene in West Absheron structure appear only in a short volume – Balakhany suite occurring in the monomict quartz sandstones of fluvial-distributary origin. Grey Miocene series appear with the alternation of units of polymict sandstones and grey hydromicaceous-kaolinite clay with interlayers of cement stones. Maikop series appear in short extent and occur in polimict aleurites and brown-grey clays including calcite-siderite concretion.
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