We'd like to understand how you use our websites in order to improve them. Register your interest. The Tisza and Dacia mega-units constitute a central part of the Alps-Carpathians-Dinarides orogenic system. Polyphase medium-grade metamorphism observed in mineral assemblages from the crystalline basement is often correlated with Variscan and pre-Variscan events. However, a mid-Cretaceous Sm—Nd garnet age Pre-Variscan and Variscan ages were obtained from the core of zoned monazite grains and from samples that apparently escaped Alpine overprinting.
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We'd like to understand how you use our websites in order to improve them. Register your interest. The Tisza and Dacia mega-units constitute a central part of the Alps-Carpathians-Dinarides orogenic system. Polyphase medium-grade metamorphism observed in mineral assemblages from the crystalline basement is often correlated with Variscan and pre-Variscan events.
However, a mid-Cretaceous Sm—Nd garnet age Pre-Variscan and Variscan ages were obtained from the core of zoned monazite grains and from samples that apparently escaped Alpine overprinting. Permian to Early Triassic monazite ages correlate with the intrusion of granitic melts and pegmatites.
Early Cretaceous ages from rims of chemically zoned grains and from monazite inclusions in garnet, biotite and staurolite represent newly formed metamorphic grains that crystallized on the prograde path during Alpine metamorphism.
Exclusively mid-Cretaceous monazite ages from the inselbergs and the Rebra-Unit of the Rodna Mountains, allow extending the Alpine prograde overprint across the Transylvanian basin. Together with other studies from the basement of the Pannonian basin, this implies that the Dacia Mega-Unit and parts of the Tisza Mega-Unit experienced a medium-grade metamorphic overprint and synkinematic garnet-growth during late Early Cretaceous times.
The Alpine prograde medium-grade overprint is pronounced in the contact zone between the Tisza and Dacia mega-units and forms a continuous belt with the Cretaceous metamorphic imprint in the Eastern Alps, when back-rotated to its original position during the Cretaceous. This is a preview of subscription content, log in to check access.
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He is well known for his scientific contributions to the development of the theories of global tectonics applied to the study of the geology of the Carpathian Mountains , for his pioneering in speleology and for the development of this science, but also for the popularization of science and of ecology in Romania. Marcian Bleahu is the author of more than 41 books and scientific papers, of more than articles on different topics. He has more than public appearances as a speaker, including the radio and the television, he is a pioneer in using the multimedia in conferences, he is the author of the first geological map of Romania. As such, Marcian Bleahu is one of the most important Romanian scientific personalities of the second half of the last century.
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