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- W6724280 abstract "Se aplica, por primera vez en Bulgaria, el metodo del indice de alteracion del color de los conodontos (CAI) a rocas del subsuelo correspondientes a un sondeo en el NO de Bulgaria de edad Eifeliense terminal-Givetiense-Tournaisiense. Se han determinado valores de CAI 1,5-2 a 3, indicativos de un intervalo termico de 50-200oC, que permiten inferir condiciones diageneticas (grado catagenetico) en las rocas estudiadas. Los valores del CAI se correlacionan con el valor de la cristalinidad de la illita, obtenido previamente en esta sucesion. La distribucion del CAI se atribuye principalmente a un control estratigrafico, en tanto que los procesos tectonicos solo habrian actuado de forma indirecta sobre los niveles de maduracion termica que se han identificado. La coexistencia de distintos valores del CAI en los niveles en los que se ha documentado la Biozona de Siphonodella crenulata (Tournaisiense) puede atribuirse a los efectos de fluidos hidrotermales. Las observaciones texturales realizadas en los elementos conodontales parecen favorecer esta posibilidad. La sucesion investigada se encuentra dentro de la denominada ventana de hidrocarburos, por lo que tiene posibilidades potenciales de proporcionar recursos energeticos = Late Eifelian-Givetian and Tournaisian subsurface limestone intervals from one borehole in the northwestern part of Bulgaria are analysed by means of conodont colour alteration index (CAI) for the first time in Bulgaria. Thermal maturity levels indicated by CAI values 1,5-2 to 3 (50-200oC), suggest diagenetic conditions (catagenetic grade). CAI values agree well with the previously obtained by illite crystallinity (IC) measurements. A stratigraphical control in the distribution of the CAI values is inferred, but the tectonic processes exert an indirect influence on the levels of thermal maturity. Mixed CAI values recorded from the Siphonodella crenulata Biozone (Tournaisian) could be due to the effects of hydrothermal fluids. Textural analysis of the conodont elements favour this possibility. The studied stratigraphical interval is within the hydrocarbon window and, thus, has potential for exploration" @default.
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- W6724280 date "2002-01-01" @default.
- W6724280 modified "2023-09-23" @default.
- W6724280 title "Conodot colour alteration index and thermal maturation in Devonian and Carboniferous sediments of northwestern Bulgaria" @default.
- W6724280 hasPublicationYear "2002" @default.
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