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Abstract
The Algyő High (AH) is an elevated crystalline block in southeastern Hungary covered by thick Neogene sediments. Although productive hydrocarbon reservoirs are found in these Neogene sequences, numerous fractured reservoirs also occur in the pre-Neogene basement of the Pannonian Basin. Based on these analogies, the rock body of the AH might also play a key role in fluid storage and migration; however, its structure and therefore the reservoir potential is little known. Based on a comprehensive petrologic study in conjunction with analysis of the spatial position of the major lithologies, the AH is considered to have been assembled from blocks with different petrographic features and metamorphic history. The most common lithologies of garnet-kyanite gneiss and mica schist associated with garnetiferous amphibolite are dominant in the northwestern and southeastern parts of the AH. The first regional amphibolite facies metamorphism of the gneiss and mica schist was overprinted by a contact metamorphic (metasomatic) event during decompression in the stability field of kyanite. Garnet-bearing amphibolite experienced amphibolite facies peak conditions comparable with the host gneiss. Regarding the similarities in petrologic features, the northwestern and southeastern parts of the area represent disaggregated blocks of the same rock body. The central part of the AH area is characterized by an epidote gneiss-dominated block metamorphosed along with a greenschist-facies retrograde pathway as well as a chlorite schist-dominated block formed by greenschist-facies progressive metamorphism. The independent evolution of these two blocks is further confirmed by the presence of a propylitic overprint in the chlorite schists. The different metamorphic blocks of the northwestern, southeastern and central parts of the AH probably became juxtaposed along post-metamorphic normal faults developed due to extensional processes. The supposed brittle structural boundaries between the blocks could have provided hydrocarbon migration pathways from the adjacent over-pressured sub-basins, or could even represent suitable reservoirs.
Tertiary stratigraphy, paleogeography and structural history of the Gebel Arief en Naqa area, Eastern Sinai. - Isr. J. Earth Sci., 29, pp. 114 - 139 . Mesozoic and Tertiary stratigraphy, paleogeography and structural history of the
. Stöcklin , J. 1968 : Structural history and tectonics of Iran: A review . – American Association of Petrology and Geology Bulletin , 52 , pp. 1229 – 1258
Kiss, A., B. Gellért, L. Fodor 2001: Structural history of the Porva Basin in the Northern Bakony Mts. (Western Hungary): implications for the Mesozoic and Tertiary tectonic evolution of the Transdanubian Range and Pannonian Basin. — Geologica
. 1968 : Structural history and tectonics of Iran; A review. — American Association of Petroleum Geologists Bulletin, 52 , pp. 1229 – 1258 . Stöcklin , J. 1972 : Iran Central
