A Clockwise P-T Path from the Variscan Basement of the Tisza Unit, Pannonian Basin, Hungary
<div>The polymetamorphic basement of the Tisza Unit forms a detached</div><div>fragment of the Variscan European foreland of the Neotethyan</div><div>realm. A clockwise evolution path of a gneiss-amphibolite complex</div><div>of the Tisza Unit was reconstruc...
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| Formatua: | Artikulua |
| Hizkuntza: | English |
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Croatian Geological Survey
2010-11-01
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| Saila: | Geologia Croatica |
| Gaiak: | |
| Sarrera elektronikoa: | http://www.geologia-croatica.hr/ojs/index.php/GC/article/view/266 |
| _version_ | 1828519352790417408 |
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| author | Peter Arkai Peter Horvath Geza Nagy |
| author_facet | Peter Arkai Peter Horvath Geza Nagy |
| author_sort | Peter Arkai |
| collection | DOAJ |
| description | <div>The polymetamorphic basement of the Tisza Unit forms a detached</div><div>fragment of the Variscan European foreland of the Neotethyan</div><div>realm. A clockwise evolution path of a gneiss-amphibolite complex</div><div>of the Tisza Unit was reconstructed, investigating the polymetamorphic</div><div>rocks of the borehole Baksa-2, SE Transdanubia, Hungary.</div><div>The results obtained by microstructural and mineral paragenetic</div><div>observations, mineral chemical analyses, and thermobarometric calculations define a P-T loop which suggests a complex Variscan</div><div>polyphase model rather than a pre-Variscan - Variscan polycyclic</div><div>one. The early part of the prograde path with kyanite is characterized</div><div>by T-P conditions of 480±50¡C and 470±70 MPa, respectively. The</div><div>metamorphism reached its peak at 660±25 ¡C and 750±50 MPa,</div><div>when both kyanite and staurolite were stable. This metamorphic climax</div><div>was followed by a nearly isothermal decompression to 440±2 0</div><div>MPa at 650±40¡C. This event is marked by the presence of sillimanite</div><div>and a second generation of garnet, and is closely related to the collisional Variscan granitoid magmatism observed in considerable parts</div><div>of the Tisza Unit. In amphibolites intercalated with gneisses, only this</div><div>last event was preserved, providing T-P estimates of ca. 650-690¡C /</div><div>400-500 MPa. The present paper provides the first demonstration of a</div><div>continuous, clockwise P-T path from the metamorphic basement of</div><div>the Hungarian part of the Tisza Unit.</div> |
| first_indexed | 2024-12-11T19:10:36Z |
| format | Article |
| id | doaj.art-c42d0b053e704bc8a9e4652bbcb15af1 |
| institution | Directory Open Access Journal |
| issn | 1330-030X 1333-4875 |
| language | English |
| last_indexed | 2024-12-11T19:10:36Z |
| publishDate | 2010-11-01 |
| publisher | Croatian Geological Survey |
| record_format | Article |
| series | Geologia Croatica |
| spelling | doaj.art-c42d0b053e704bc8a9e4652bbcb15af12022-12-22T00:53:47ZengCroatian Geological SurveyGeologia Croatica1330-030X1333-48752010-11-0152210911710.4154/GC.1999.09178A Clockwise P-T Path from the Variscan Basement of the Tisza Unit, Pannonian Basin, HungaryPeter Arkai0Peter Horvath1Geza Nagy2Laboratory for Geochemical Research, Hungarian Academy of SciencesLaboratory for Geochemical Research, Hungarian Academy of SciencesLaboratory for Geochemical Research, Hungarian Academy of Sciences<div>The polymetamorphic basement of the Tisza Unit forms a detached</div><div>fragment of the Variscan European foreland of the Neotethyan</div><div>realm. A clockwise evolution path of a gneiss-amphibolite complex</div><div>of the Tisza Unit was reconstructed, investigating the polymetamorphic</div><div>rocks of the borehole Baksa-2, SE Transdanubia, Hungary.</div><div>The results obtained by microstructural and mineral paragenetic</div><div>observations, mineral chemical analyses, and thermobarometric calculations define a P-T loop which suggests a complex Variscan</div><div>polyphase model rather than a pre-Variscan - Variscan polycyclic</div><div>one. The early part of the prograde path with kyanite is characterized</div><div>by T-P conditions of 480±50¡C and 470±70 MPa, respectively. The</div><div>metamorphism reached its peak at 660±25 ¡C and 750±50 MPa,</div><div>when both kyanite and staurolite were stable. This metamorphic climax</div><div>was followed by a nearly isothermal decompression to 440±2 0</div><div>MPa at 650±40¡C. This event is marked by the presence of sillimanite</div><div>and a second generation of garnet, and is closely related to the collisional Variscan granitoid magmatism observed in considerable parts</div><div>of the Tisza Unit. In amphibolites intercalated with gneisses, only this</div><div>last event was preserved, providing T-P estimates of ca. 650-690¡C /</div><div>400-500 MPa. The present paper provides the first demonstration of a</div><div>continuous, clockwise P-T path from the metamorphic basement of</div><div>the Hungarian part of the Tisza Unit.</div>http://www.geologia-croatica.hr/ojs/index.php/GC/article/view/266GneissAmphiboliteGeothermobarometryVariscan regional metamorphismTisza UnitPannonian BasinHungary |
| spellingShingle | Peter Arkai Peter Horvath Geza Nagy A Clockwise P-T Path from the Variscan Basement of the Tisza Unit, Pannonian Basin, Hungary Geologia Croatica Gneiss Amphibolite Geothermobarometry Variscan regional metamorphism Tisza Unit Pannonian Basin Hungary |
| title | A Clockwise P-T Path from the Variscan Basement of the Tisza Unit, Pannonian Basin, Hungary |
| title_full | A Clockwise P-T Path from the Variscan Basement of the Tisza Unit, Pannonian Basin, Hungary |
| title_fullStr | A Clockwise P-T Path from the Variscan Basement of the Tisza Unit, Pannonian Basin, Hungary |
| title_full_unstemmed | A Clockwise P-T Path from the Variscan Basement of the Tisza Unit, Pannonian Basin, Hungary |
| title_short | A Clockwise P-T Path from the Variscan Basement of the Tisza Unit, Pannonian Basin, Hungary |
| title_sort | clockwise p t path from the variscan basement of the tisza unit pannonian basin hungary |
| topic | Gneiss Amphibolite Geothermobarometry Variscan regional metamorphism Tisza Unit Pannonian Basin Hungary |
| url | http://www.geologia-croatica.hr/ojs/index.php/GC/article/view/266 |
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