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- W2037754499 abstract "Riphean and Palaeozoic linear graben-like platform depressions — aulacogens —jointly with linear swell uplifts in a platform cover, intraplatform folded zones and Meso-Cenozoic epi-platform rift zones are different morphological manifestations of a single group of linear platform structures. Aulacogens are characterized by the long duration of their development and ability for regeneration. Their existence is certain, mainly since the Late Proterozoic (Riphean). Usually they inherit more ancient linear attenuated tectonic zones of platform basement or “adjust” to them. Aulacogens pass through common stages of development forming a single “cycle” or in many cases, even several similar though not identical “cycles”. The “cycle” starts with the incipience (or regeneration) of a linear graben-like depression limited by normal faults and after a more or less deep and long subsidence, accompanied often by basic or alkaline-basic volcanism, it is completed in many cases by an inversion stage. At this stage horst-like uplifts appear limited by thrust and overthrusts in the aulacogen basement, while linear swell-like uplifts or their systems and even linear folded structures occur in its cover. The early stages of an aulacogen evolution occur under horizontal extension conditions, whereas the inversion stage takes place under a compressional regime. “Cycles” of aulacogen development resemble (in attenuated, miniature form) the development “cycle” of adjacent geosynclinal areas, coincide with them in time and many “through” and “penetrating” aulacogens are their direct offsets. The Late Proterozoic “cycle” of aulacogen evolution corresponds to a “pre-plate” stage of the platform history (“aulacogen stage” by Bogdanov) and is characterized by the widest development of a network of differently oriented aulacogens over the whole area of ancient platforms which have been subjected to some general horizontal extension (“crawling away”) and only partially compensated by compression during the inversion stage. The subsequent aulacogen development in Palaeozoic and on Laurasian platforms —partly in Meso-Cenozoic — was spatially and genetically connected with the history of geosynclinal (later orogenic) belts bordering these platforms. With regard to Gondwana platforms (and later the North American and Siberian), the Mesozoic saw the development of many aulacogens or rift zones ranging parallel to transversally with respect to the recent margins of platforms. This process was connected with the break up of the Gondwana supercontinent and the formation of “secondary” oceanic depressions. As a rule, it has not been completed by inversion, but took place under extension conditions and probably some general expansion of the earth activated during the Meso-Cenozoic." @default.
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- W2037754499 date "1981-03-01" @default.
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- W2037754499 title "Aulacogens of ancient platforms: Problems of their origin and tectonic development" @default.
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- W2037754499 doi "https://doi.org/10.1016/0040-1951(81)90185-2" @default.
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