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Interference Folding of the Southern Slope of the Greater Caucasus

Интерференционная складчатость южного склона Большого Кавказа

Interference Folding of the Southern Slope of the Greater Caucasus

Abstract

В результате проведенных многолетних региональных геолого-структурных исследований в пределах южного склона Большого Кавказа установлено развитие интерференционной складчатости. Она слагает краевую южную часть отдельных участков Северо-Западного, Центрального и Юго-Восточного Кавказа. Полоса развития интерференционной складчатости, длиной более 85 км и шириной до 25 км, имеет в общем субширотное простирание, в отличие от северо-западной ориентировки главной линейной складчатости региона. Все участки характеризуются развитием однообразных почти идентичных по морфологии и ориентировке пересекающихся складчатых структур. Они представлены как линейными складками, так и брахиформными, а также нелинейными округлыми структурами. Отдельные складки имеют в плане северо-восточную, северо-западную, субмеридиональную и субширотную ориентировки. Она сложена многопорядковыми структурами, которые состоят из складок самых различных форм и размеров, от первых сотен метров до нескольких км и первых десятков км. В линейных коротких линзовидных складках часто наблюдается изгибание шарниров как в плане, так и в разрезе. Иногда отмечается разветвление структур, фестончатая морфология их периклиналей и клиновидные формы складок. Куполовидные, чашеобразные и брахиформные структуры имеют в плане округлые, овальные, каплевидные, четырехугольные и подковообразные очертания. Возникли они путем преобразования первичных пликативных структур, сформированных на ранне-среднеальпийском и раннеорогенном этапах, в обстановке северо-восточного тангенциального сжатия Большого Кавказа. Во время позднеорогенной стадии ориентация раннего давления в регионе сменилась субмеридиональным стрессом. Это вызвало придвигание на север отдельных блоков-шолей Черноморско-Закавказского микроконтинента и их внедрение в складчатую систему Большого Кавказа. Такая деформация обусловила косое наложение на локальных участках развития ранней складчатости субмеридионального давления и повторное сжатие стрктур. В результате сочетания этих разноориентированных процессов дислокации в краевой южной зоне Большого Кавказа произошло образование типичной интерференционной структуры. Таким образом, механизм формирования интерференционной складчатости представляет собой результат проявления разновозрастных внешних односторонных, но разноплановых тангенциальных деформаций, происходящих в альпийском цикле на Большом Кавказе As a result of the detailed geological-structural researches within the Southern Slope of the Greater Caucasus there have been established the development of the interference folding. It builds up southern marginal part of separate areas of North-West, Central and South-East Caucasus. The 85 km long and 25km wide stripe of development of the interference folding in general has sublatitudional directions in distinction from NW orientation of main linear folding of the region. All areas are characterized with development of uniform intersecting folded structures of nearly identic morphology. They are represented by linear folds as well as by brachiform folds and nonlinear rounded structures. Individual folds in the plane have NW, sublatitudional and submeridional orientation. Its built up with multi-order structures of folds of different shape and size, from first hundred meters to several kilometers and first tenth kilometers. In short linear lens-shaped folds bending of fold hinges in plane and section are observed. Sometimes brenching of the structures, festoon morphology of their pericline and wedge-shaped forms are recorded. Domes, pit-like (cuppy) and brachiform structures in plane have rounded, oval, drop-shaped, four-sided (quadrangular), horseshoe shapes. It occurred due to the transformation of the primary linear plicative structures, formed at the Early-Middle Alpine and Early Orogenic stages during the NW tangential compression of the Greater Caucasus. At the Late Orogenic collision stage, the orientation of the previous stress in this region was replaced by the submeridional stress. It caused the northward movement of certain block-schols of the Black Sea-Transcaucasian micro-continent and its intrusion into the folded system of the Greater Caucasus. Such deformation caused the oblique superposition of submeridional strains and the repeated compression of the structures on the local areas of development of the previous folding of submeridional strains. In the result of combination of these processes of different orientation typical interferential structure was formed in the southern edge zone of the Greater Caucasus. Thus, mechanism of the formation of interferential folding represents manifestation of external unilateral, but diversified (in plane) tangential deformations occurred during the Alpine cycle in the Greater Caucasus

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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