Triassic rift-type basalts and related deep-water sediments in the ophiolite belt of the Dinarides-Hellenides-Taurides-Zagros
Publish place: 2nd International Congress of Applied Geology
Publish Year: 1394
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
IAGC02_055
تاریخ نمایه سازی: 25 آذر 1395
Abstract:
Triassic rift related magmatism was dominantly intermediate in character. It produced basalts, andesites and dacite at the extrusive level, and gabbro, diorite, granosyenite and granite in the intrusive levels and lasted at least 40 to 50 Ma. It is spatially and genetically related to the volcanosedimentary formation as the foundation of the Gondwana passive continental margin and later on covered mostly by the Mesozoic carbonate platform sediments. Its equivalents in time, on the EuroAsian diverging margin, are not easily recognized. They were subjected to long-term destructive, subduction related processes, during convergence, since Jurassic to Early Cretaceous times. However, rifting metallogeny, randering MVT and SEDEX deposits in symetrical manner between Dinaridic carbonate platform on the Gondwana passiv margin and Moesian carbonate platform on the EuroAsian countarpart, also places triassic magmatism into the advanced intracontinental rifting. The spatial extension of these phenomena can be traced along the whole Alpine-Himalayan orogenic belt, from Alps, Dinarides, Albanides, Hellenides, Taurides, Oman Mts., and Zagros. The intensity of the magmatism ceased down with the opening of the Neo-Tethys, accompanied by ophiolite formation, as a result of the sea-floor spreading. Study of Triassic magmatism and its products, including ore deposits, is the key to palinspastic interpretation and geological evolution of the Neo-Tethys history. A heralding sign of the Neo-tethyan birst is a unique appearance of two remarkable evidences, Triassic rift-type basalts and deep water Hallstatt sediments, usually joint in the mélanges, within the footwalls or on the heads of the ofiolitic slabs.
Authors
Ladislav Palinkaš
University of Zagreb, Faculty of Science, Department of Mineralogy and Petrology, 10000 Zagreb, Horvatovac 105, Croatia
Gabriella Kiss
Geological, Geophysical and Space Science Research Group of the Hungarian Academy of Sciences
Sándor Kovács
Geologyical Survey of Federation Bosnia and Herzegovina
Sabina Strmić
University of Zagreb, Faculty of Science, Department of Mineralogy and Petrology, 10000 Zagreb, Horvatovac 105, Croatia
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