A platinafémek előfordulása a Darnó-öv és környezetének mezozóos és paleogén korú magmás kőzeteiben = Occurrence of platinum group elements in the magmatic rocks of Mesozoic and Palaeogene age in the Darnó belt and its surroundings

Kutatasaink soran a Darnoi-egyseg triasz koru szubmarin bazaltos kifejlődeseit osszehasonlitottuk a Dinaridak hasonlo jellegű es koru foldtani kepződmenyeinek vulkanologiai, asvanytani-kőzettani es a geokemiai jellemzőivel. Eredmenyeink arra utalnak, hogy a sajatos vulkanizmus a Neo-Tethys ocean riftesedesi folyamatanak előrehaladott allapotaban ment vegbe. Geokemiai adataink megerősitettek, es tovabb arnyaltak a Darnoi-egyseg es a Szarvaskői-egyseg parnalavainak es intruziv kifejlődeseinek elterő petrogenetikajat. A Szavaskői-egyseg jura korat Ar-Ar modszerrel vegzett ujabb korhatarozas alapjan megerősitettuk. Kimutattuk, hogy a Szarvaskői-egyseg gabbrojanak kristalyosodasat magmas fluidum szegregacioja kiserte. Geokemiai vizsgalataink azonban csak a bazaltos parnalava kifejlődesekben talaltak csekely Pt, Pd es Ir anomaliat (1-70 ppb). Pd-anomaliak (1-2 ppb) a Darnoi-egyseg bazaltos kepződmenyeiben is előfordulnak. A paleogen koru Recski Magmas Komplexum vulkani sorozataiban uj erchordozo szerkezeteket hataroztunk meg es ezekben a Pt, Pd es Ru tized ppm nagysagrendű koncentracioit talaltuk. Kutatasain eredmenyei azt bizonyitjak, hogy a platinafemek hidrotermas folyamatok soran mobilisak. A platinafemek masodlagos dusulasait olyan hidrotermas folyamatok alakitottak ki, melyeknek oldatai nagy sotartalmuak voltak. | Comparative studies on volcanology, mineralogy, petrology and geochemistry of the submarine basaltic formations of the Darno unit and similar units of the Dinarides have been completed in the frame of the research project. Results suggest that this peculiar volcanism took place in the advanced rifting stage of the Neo-Tethyan Ocean. Results of geochemical studies confirm the different petrogenesis of pillow basalts and intrusive rocks in the Szaravaskő Unit. The Jurassic age of magmatism in the Szarvaskő unit was confirmed by new Ar-Ar age determinations. Magmatic fluid segregation processes in relation to crystallization of gabbro in the Szarcvaskő unit was also stuied. However, geochemical analyses fund small Pt, Pd es Ir anomalies (1-70 ppb) in the basaltic rocks of this unit only. Occurrences of geochemical anomalies of Pd (1-2 ppb) was also found in the basalts of the Darno unit. In the volcanic sequences of the Recsk Magmatic Complex of Palaeogene age, new hydrothermal ore structures were defined and enrichments of Pt, Pd Ru in the order of tenths of ppm were detected. Results of research prove that hydrothermal processes are capable to mobilize platinum group metals. The secondary enrichments of these metals were formed in hydrothermnal systems characterized by high salinities of solutions.