Stratigraphic Characteristic Devon System Of Mountain Kuldzhuktau (South Tian-Shan)

Аннотация

This article presents the results of long-term stratigraphic studies on the territory of the Kuldzhuktau mountains. Schemes for the division and correlation of Devonian deposits have been created based on complete biostratigraphic data that most effectively reflect the geological age of local stratigraphic units and their reliable correlation with geological age. The tier units of the International Devonian Stratigraphic Scale are substantiated at the present stage of research. Due to the widespread use of conodonts, it was possible to clarify the physical and age volumes, as well as the sequence of Devonian deposits in the territory of Kuldzhuktau, and almost completely reconstruct the Devonian section. KEYWORDS Devonian, stage, straton, Kuldzhuktau mountains, fauna, conodonts, biostratigraphic method. INTRODUCTION Tectonically, the Kuldzhuktau Mountains are a complex folded structure consisting of a The relevance of the research substantiated series of narrow, highly compressed the creation of a scheme of dissection and asymmetric folds with a sharply emphasized correlation of Devonian deposits in the linear orientation of their axes in the Kuldzhuktau mountains in the Southern Tien northwest direction. The wings of the folds Shan. are broken by faults, most of which are faults The US A Journals Volume 02 Issue 12-2020 100 The American Journal of Applied Sciences IMPACT FACTOR (ISSN – 2689-0992) 2020: 5. 276 Published: December 27, 2020 | Pages: 100-112 Doi: https://doi.org/10.37547/tajas/Volume02Issue12-16 OCLC - 1121105553 and only a part are steeply dipping thrusts In the world of research on the definition of (Biske, 1996 [8]). Devonian conodont biostratigraphy were engaged: Bassler, 1925 [6]; Branson and Mehl, Several formations in the age range from 1933 [9]; Philip, 1966 [26]; Carls and Gandl, Ordovician to Carboniferous take part in the 1969 [11]; Pedder et al. 1970 [25]; Klapper and geological structure of the Kuldzhuktau Philip, 1971 [16]; Boersma, 1973 [7]; Wang et al. mountains, which are grouped into two 1974 [28] Weddige and Ziegler 1979 [29]; Bai, tectonic plates linearly elongated in the et al., 1979-1994 [3]; Mawson 1987 [21]; latitudinal direction: autochthon (northern Bultynck, 1989 [10]; Talent and Mawson 1999 block) and allochthon (southern block). These [27]; Bardashev et al., 2002 [5]; Mawson and plates have a similar structure with slight Talent 2003 [22]; Ma, et al., 2009 [18]; differences in the base and upper parts of the Martínez-Pérez, and Valenzuela-Ríos, 2014 section (Mirkamalov et al., 2020 [23]). [20]; Lu, et al., 2016 [17] and many other The aim of the research is to correlate the researchers. Devonian deposits of the Kuldzhuktau For the territory of Central Asia, the Mountains on more complete biostratigraphic characteristics of the Devonian conodont data that most effectively reflect the biostratigraphy are reflected in the works: geological age of local strata and their reliable Mashkov, 1978 [19]; Kim, et al., 1978-2012 [13- correlation with the longline units of the 15]; Bardashev, 1986 [4]; Apekina 1989 [4]; International Devonian Stratigraphic Scale at Yolkin et al., 1994 [30], 1997 [31], 2008 [32], the present stage of research. 2011 [33]; Nikolaeva et al., 2017 [24] and others. METHODOLOGY By comprehensively substantiating the age volumes of the Lower and Middle Devonian Stratigraphic studies for the study of Devonian sediments using the data obtained on deposits in the territory of the Kuldzhuktau conodonts, it was possible to significantly mountains, field research was carried out clarify their age volumes, and significantly during 2015-2017. by employees of the enrich the arsenal of the biostratigraphic Stratigraphic Party, the State Unitary method for decoding the stratigraphic Enterprise "Regional Geological Survey sequence of strata in the tectonically complex Expedition" under the Committee of the regions of the Kuldzhuktau Mountains (Fig. 1). Republic of Uzbekistan on Geology and Mineral Resources. The US A Journals Volume 02 Issue 12-2020 101 The American Journal of Applied Sciences IMPACT FACTOR (ISSN – 2689-0992) 2020: 5. 276 Published: December 27, 2020 | Pages: 100-112 Doi: https://doi.org/10.37547/tajas/Volume02Issue12-16 OCLC - 1121105553 Fig.1. Physical map of research areas: a- Republic of Uzbekistan and adjacent territories in the world; b-hypsometric map of the Republic of Uzbekistan and adjacent territories; from the study areas of the Kuldzhuktau Mountains. RESULTS AND DISCUSSION village, west, east and north of the Tozbulak intrusion, in the areas of the Uchkuduk, The Devonian formations are the most Shaydaraz, Sultanbibi, Arapkazgan, Izakuduk, widespread and are represented by essentially Bashguzhumdy wells, in the Guzhumdy marine carbonate, siliceous-carbonate, mountains and with minor outcrops in the terrigenous-carbonate-siliceous and regions of the Kuyng uplands in the form of terrigenous deposits. Tuzkoy and Tuzkoy sections of latitudi