A. Yu. Guzhikov | Saratov State University (original) (raw)

Papers by A. Yu. Guzhikov

1 Санкт-Петербургский государственный университет, Российская Федерация, 199034, Санкт-Петербург,... more 1 Санкт-Петербургский государственный университет, Российская Федерация, 199034, Санкт-Петербург, Университетская наб., 7/9 2 Саратовский государственный университет им. Н. Г. Чернышевского, Российская Федерация, 410012, Са-ратов, ул. Астраханская, 83 3 ФГУ НПП «Геологоразведка», Российская Федерация, 192019, Санкт-Петербург, ул. Книпович, 11/2 Обобщены результаты био-и магнитостратиграфических исследований верхней части разреза верхнего берриаса «Заводская балка» (Феодосия, Крым). В этом разрезе впервые най-дены представители рода Riasanites (Ammonoidea), позволяющие коррелировать отложения с зоной boissieri (подзоной crassicostatum). Изучено распространение фораминифер, остракод и диноцист. По фораминиферам и диноцистам отложения сопоставляются с верхним берриа-сом-нижним валанжином стандартной тетической шкалы. В палеомагнитной колонке, пред-ставленной знакопеременной полярностью, предположительно, идентифицированы аналоги магнитных хронов M15 и M14. Результаты магнитостратиграфи...

Stratigraphy and Geological Correlation, 2024

This paper summarizes the state of knowledge of the Cretaceous stratigraphy of the Mountainous Cr... more This paper summarizes the state of knowledge of the Cretaceous stratigraphy of the Mountainous Crimea and selected biostratigraphic groups and magnetostratigraphy. The first part of the paper discusses the Early Cretaceous, its stratigraphy, selected fossil groups and magnetostratigraphy of the Mountainous Crimea. The data on the figured reference sections were updated in terms of biostratigraphic zonation. Selected fossil groups represented in the paper include ammonites, organic-walled dinoflagellate cysts, ostracods, calpionellids and nannoplankton. The description of each group contains an information on the main publications, types of biostratigraphic units and their distribution, fossil assemplages, images of the most important fossils, and brief discussion on the correlation. Some of the ammonite index fossils are figured for the first time. The magnetostratigraphy summarizes latest data published mostly in Russian for the whole Early Cretaceous succession of the Mountainous Crimea.

The results bio-, magnetostratigraphic, cyclostratigraphic, lithological and mineralogic studies ... more The results bio-, magnetostratigraphic, cyclostratigraphic, lithological and mineralogic studies of the upper part of Sultanovskaya formation and Zelenogorskaya formation near v. Alexeevka (Belogorskiy
region of Crimea) were presented in current work. The results of lithological and mineralogic analysis argues for the stratigraphic break between “Sultanovskaya” formation and “Zelenogorskaya” formation and implicitly indicate the age of the sediments as late berriasian. The analogue of magnetic chron M16n and probable analogue of M15n chron, were established in the section. With help of spectral analysis of petromagnetic variations along the section, there were detected 4 short
eccentricity cycles (~100 kyr) and 11 obliquity cycles (40 kyr) within M16n.

The results of magnetostratigraphic investigations in the Upper Berriasian Zavodskaya Balka secti... more The results of magnetostratigraphic investigations in the Upper Berriasian Zavodskaya Balka section (Feodosiya, Crimea) are presented: magnetic polarity information, data on magnetic susceptibility, its anisotropy (AMS), frequency dependence (FD-factor) and other petromagnetic parameters. The analysis of the thermomagnetic and magnetic saturation curves has proved the presence of magnetite, being the main carrier of the remanent magnetization. Magnetic cleaning with alternating field and with temperature mostly has revealed the two-component composition of the magnetization, and the magnetostratigraphy is based on the directions of the most stable of them, with unblocking field from 35-50 mT and temperature from 300 to 540°C. The palaeomagnetic column presented specifies four heteropo-lar magnetozones-analogous to the M16 and M 15 magnetic chrons (full M16n and M15r, parts of M 16r and M15n). The existence of the M16n.lr subchron (" Feodosiya ") is substantiated, and it should be included into the Geomagnetic Polarity Time Scale. By bio-and mag netostratigraphic correlation, the section studied is an age analogue of the Paramimounum, Picteti and Alpillensis (probably Otopeta) subzones of the Boissieri Zone. The calculated sedimentation rate varied from 26.6 to 29.5 m/My.

The first compiled composite section comprises continuous succession of upper Tithonian–lower Ber... more The first compiled composite section comprises continuous succession of upper Tithonian–lower Berriasian strata (Jacobi Zone) from different isolated outcrops of the Feodosiya area. Based on new magnetostratigraphic and sedimentological data, the paleomagnetic section is correlated with succession of M20r, M19n, M19r, M18b chrons and M18n.1r Subchron (“Brodno”). The thorough complex bio- and magnetostratigraphic correlation of the upper Tithonian–lower Berriasian interval (Jacobi Zone) carried out through the Western Tethys and Eastern Paratethys provided grounds for first defining age analogs of the Durangites Zone in the Crimean Mountains and specifying location of the boundary between the Jurassic and Cretaceous systems, as well as for determining late Tithonian age of strata in the Dvuyakornaya Bay section barren of fossils.

The most complete composite Berriasian bio- and magnetostratigraphic section of central Crimea is... more The most complete composite Berriasian bio- and magnetostratigraphic section of central Crimea is characterized for the first time with a description of the contact between the carbonate Bedenekyr and ter-
rigenous Bechku formations. The section contains all the standard ammonite zones: jacobi, occitanica, and boissieri. The Malbosiceras chaperi Beds are attributed to the occitanica Zone. The Berriasian section is characterized by six foraminiferal assemblages, ostracods (Costacythere khiamii–Hechticythere belbekensis and Costaythere drushchitzi–Reticythere marfenini beds), and dinocysts (Phobercysta neocomica Beds). The magnetostratigraphic section contains analogs of Chrons M17 and M16 reliably correlated with ammonite zones. On the basis of paleomagnetic data, the Berriasian section of central Crimea is correlated with coeval sections of the Mediterranean Region. The sedimenological analysis confirms accumulation of Berriasian sediments mostly in shallow shelf environments of the carbonate platform.

Russian Journal of Earth Sciences, 2003

The aim of this project was to study the paleomagnetic stratigraphy of the Hauterivian-Aptian dep... more The aim of this project was to study the paleomagnetic stratigraphy of the Hauterivian-Aptian deposits in the Middle Volga region, namely in the areas of the Saratov, Samara, and Uliyanovsk right-hand Volga areas. Original data were obtained for the first time for the magnetic polarity of the Hauterivian and Barremian rocks of the Russian Platform. The results obtained for the Aptian rocks agree very well with the results of the previous paleomagnetic studies which had been carried out in the Uliyanovsk region earlier and in the vicinities of Saratov City . Based on the complex correlation of the bio-and magnetostratigraphic data for the rocks from the Middle Volga region, the North Caucasus, the North Mediterranean area, and South England, it is shown that the stage and substage boundaries of the Hauterivian, Barremian, and Aptian stages differ in terms of the absolute age from the similar boundaries in the Boreal Belt by a value of some 10 5 -10 6 years, which is comparable with the duration of the Early Cretaceous ammonite zones. The diachronism of the Lower Aptian ammonite zones (Deshayesites volgensis -D. forbesi) and of the Middle Aptian Parahoplites melchioris zone in different regions. The results of this study called for a complex substantiation and tracing of the units of the General Stratigraphic Scale (GSS). The basic GSS unit must be a stage, rather than a zone, because where boundaries were traced over a large territory, the asynchronism of the boundaries between the zones is comparable with the duration of the zones, whereas in the case of a stage it is 1-2 orders of magnitude lower. Geomagnetic inversions or isotopic data can be used to test the isochronism of stratigraphic boundaries.

Stratigraphy and Geological Correlation, 2015

The most complete composite Berriasian bio and magnetostratigraphic section of central Crimea is ... more The most complete composite Berriasian bio and magnetostratigraphic section of central Crimea is characterized for the first time with a description of the contact between the carbonate Bedenekyr and ter rigenous Bechku formations. The section contains all the standard ammonite zones: jacobi, occitanica, and boissieri. The Malbosiceras chaperi Beds are attributed to the occitanica Zone. The Berriasian section is characterized by six foraminiferal assemblages, ostracods (Costacythere khiamii-Hechticythere belbekensis and Costaythere drushchitzi-Reticythere marfenini beds), and dinocysts (Phobercysta neocomica Beds). The magnetostratigraphic section contains analogs of Chrons M17 and M16 reliably correlated with ammo nite zones. On the basis of paleomagnetic data, the Berriasian section of central Crimea is correlated with coeval sections of the Mediterranean Region. The sedimenological analysis confirms accumulation of Berri asian sediments mostly in shallow shelf environments of the carbonate platform.

Stratigraphy and Geological Correlation, 2012

The first compiled composite section comprises continuous succession of upper Tithonian-lower Ber... more The first compiled composite section comprises continuous succession of upper Tithonian-lower Berriasian strata (Jacobi Zone) from different isolated outcrops of the Feodosiya area. Based on new magne tostratigraphic and sedimentological data, the paleomagnetic section is correlated with succession of M20r, M19n, M19r, M18b chrons and M18n.1r Subchron ("Brodno"). The thorough complex bio and magneto stratigraphic correlation of the upper Tithonian-lower Berriasian interval (Jacobi Zone) carried out through the Western Tethys and Eastern Paratethys provided grounds for first defining age analogs of the Durangites Zone in the Crimean Mountains and specifying location of the boundary between the Jurassic and Creta ceous systems, as well as for determining late Tithonian age of strata in the Dvuyakornaya Bay section barren of fossils.

Doklady Earth Sciences, 2006

Volga region, Northern Caucasus, and other regions carried out by the authors of the present comm... more Volga region, Northern Caucasus, and other regions carried out by the authors of the present communication for more than 10 years resulted in the detailed correlation of biostratigraphic zonal scales between each other (mainly upper Hauterivian-Aptian) and with the "standard" scale of the Western Mediterranean . Paleomagnetic inversions are known to be synchronous for all rock sequences on the earth regardless of the latitude of their formation. Therefore, correlation of regional magnetoand biostratigraphic scales (magnetochronological calibration) allowed us to establish and assess quantitatively for the first time the asynchronous nature of the series of stratigraphic boundaries, which were regarded as synchronous for different paleogeographic belts.

Stratigrafiya. Geologicheskaya korrelyatsiya, May 1, 2010

The Bathonian-Callovian boundary section located near the Prosek Settlement (Nizhni Novgorod regi... more The Bathonian-Callovian boundary section located near the Prosek Settlement (Nizhni Novgorod region) is described with the characteristic of its grain size composition and terrigenous-mineral ogical, petromagnetic, and paleomagnetic properties. Based on lithological-mineralogical and petromag netic data, the section is subdivided into four members corresponding to the most significant sedimentation rhythms. No sharp changes in the composition of sediments are noted through the section, which indicates its relative continuity. Despite the significant remagnetization of these sediments during the Quaternary, the characteristic component (ChRM) is definable by the method of the intersection of large circles. The simi larity between coordinates of the calculated virtual geomagnetic pole (VGMP) and the positions of standard virtual geomagnetic poles in the stable European continent during corresponding periods serves as an impor tant argument in favor of the primary nature of the ChRM. The compiled magnetostratigraphic section is well consistent with the paleomagnetic zonation, established in the coeval sediments of West Europe. As com pared with the Bathonian-Callovian boundary section in the Albstadt-Pfeffingen of Germany, which claims to the GSSP role, the Prosek section represents a more favorable object for paleomagnetic studies. Combined with the lack of large scale gaps in the sedimentary record and, with other conditions being equal, this makes this section a more preferable candidate for the Callovian GSSP standard.

RF), two plenary reports were delivered:“Progress in Studying the Jurassic in the World and Russi... more RF), two plenary reports were delivered:“Progress in Studying the Jurassic in the World and Russia”(VA Zakharov), in which much consideration was given to selecting sections and events for establishing the global stratotype section point (GSSP)”, and “JURASSIC. RU 2005–2009: Creation History, Cur rent State, and Prospects”(MA Rogov, AP Ippoli tov). The JURASSIC.

Books by A. Yu. Guzhikov

The monograph presents the results o f litho-, bio- and magnetostratigraphic study o f the Mounta... more The monograph presents the results o f litho-, bio- and magnetostratigraphic study o f the Mountainous Crimea Berriasian. Characteristics o f main types o f the Berriasian sections are given; formational stratification o f the Berriasian
deposits is substantiated. 80 ammonite species, 9 aptychi species, 45 bivalve mollusk species, 5 brachiopod species, 10 tintinnid species, 3 dinocyst species, and 7 ostracod species are described. The Jurassic/Cretaceous boundary is traced in the
continuous Feodosiya sequence o f the Upper Tithonian - Lower Berriasian o f the Eastern Crimea after bio- and magnetostratigraphic data. A specified version o f the Berriasian zonal scheme o f the Mountainous Crimea based on ammonites is proposed. Tintinnids, dinocysts, and ostracods assemblages correlated to the ammonite zones are determined for the first time. Magnetostratigraphic scheme o f the Upper Tithonian - Berriasian in the region is substantiated. Bio- and
magnetostratigraphic correlation o f the Berriasian o f the Mountainous Crimea with coeval formations o f the Tethys superarea, Boreal area and other paleogeographic provinces o f the Earth is carried out.
Tab. 59 Fig. 86 Bibliog. 630 ref.

Thesis Chapters by A. Yu. Guzhikov

This is the description of nannoplankton assemblages for the first time reported from the upper T... more This is the description of nannoplankton assemblages for the first time reported from the upper Tithonian – Berriasian sequences in Theodosia area of East Crimea. Relationships between nannoplankton
assemblages and magnetic zones are examined. Close characteristics of the lowermost parts of the Grandis ammonite subzone, NKT nannoplankton zone and M18r magnetic zone serve as the basis for
the authors to offer the base of Grandis subzone to be the Tithonian – Berriasian boundary.

Synthetic Aperture Radars (SAR) are space-borne instruments that emit electromagnetic radiation a... more Synthetic Aperture Radars (SAR) are space-borne instruments that emit electromagnetic radiation and then record the strength and time delay of the returning signal to produce images of the ground. Thus, SAR Differential Interferometry (DInSAR) is a remote sensing technique which uses SAR detected images from consecutive passes of the satellite to map and monitor centimetric or even millimetric ground surface deformations with an accuracy up to millimeters.