Field characteristics and petrography of the advanced rifting-related Triassic submarine basaltic blocks in the Jurassic mélange of the Darnó Unit

Kiss, Gabriella and Molnár, Ferenc and Kovács, Sándor and Palinkaš, Ladislav A. (2010) Field characteristics and petrography of the advanced rifting-related Triassic submarine basaltic blocks in the Jurassic mélange of the Darnó Unit. Central European Geology, 53 (2-3). pp. 181-204. ISSN 1788-2281

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Abstract

Abstract The Darnó Unit in NE Hungary contains basalt and associated sediments related to the advanced rifting stage of Triassic age in the Neotethys. A detailed field study of five key outcrops and two deep wells revealed that only distal facies of basaltic lava flows of submarine volcanoes occur as blocks in the Jurassic mélange; the central and the most distal facies are missing. The advanced rifting-related Triassic and oceanic stage-related Jurassic basalt flows of the same mélange can be distinguished on the basis of lithostratigraphic, structural and textural features. The paper contains for the first time the detailed description of the key outcrops of peperitic facies consisting of a mixture of basalt and red micritic limestone. The occurrence of this facies is the principle key feature for discrimination in the field between Triassic and Jurassic basalt. In addition, four types of Triassic basalt were recognized: the Báj-patak-type, the Mély Valley-type, the Nagy-Rézoldal-type and the Reszél Hill-type. The observed peculiarities of advanced rift-related basalt are also compared to characteristics of volcanics encountered in wells drilled in the Darnó Unit. This comparison solves many problems of earlier interpretations of the studied wellbore sections.

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