| Title: |
U-Pb-Th geochronology of monazite and zircon in albitite metasomatites of the Rožňava-Nadabula ore field (Western Carpathians, Slovakia): implications for the origin of hydrothermal polymetallic siderite veins |
| Authors: |
Hurai, V.; Paquette, Jean-Louis; Lexa, O.; Konečný, P.; Dianiška, I. |
| Contributors: |
Geological Institute; Slovak Academy of Science Bratislava (SAS); Laboratoire Magmas et Volcans (LMV); Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet Saint-Étienne (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC); Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS); Czech Geological Survey Praha; Geological Survey |
| Source: |
ISSN: 0930-0708. |
| Publisher Information: |
HAL CCSD; Springer Verlag |
| Publication Year: |
2015 |
| Collection: |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
| Subject Terms: |
Tourmaline; Siderite; Hydrothermal Vein; YPO4; CePO4; [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
| Description: |
International audience ; Sodic metasomatites (albitites) occur around and within siderite veins in the southern part of the Gemeric tectonic unit of the Western Carpathians. Accessory minerals of the metasomatites represented by monazite, zircon, apatite, rutile, tourmaline and siderite are basically identical with the quartz-tourmaline stage of other siderite and stibnite veins of the tectonic unit. Statistical analysis of chemical Th-U(total)-Pb isochron method (CHIME) of monazite dating yielded Jurassic-Cretaceous ages subdivided into 3–4 modes, spreading over time interval between 78 and 185 Ma. In contrast, LA-ICPMS 206Pb/238U dating carried out on the same monazite grains revealed a narrow crystallization interval, showing ages of Th-poor cores with phengite inclusions identical within the error limit with Th-rich rims with cauliflower-like structure. The determined lower intercept at 139 ± 1 Ma overlapped the Vallanginian-Berriasian boundary, thus corroborating the model of formation of hydrothermal vein structures within an arcuate deformation front built up in the Variscan basement as a response to Early Cretaceous compression, folding and thrusting. In contrast, associated zircons are considerably older than the surrounding Early-Palaeozoic volcano-sedimentary rocks, showing Neoproterozoic ages. The zircon grains in albitite metasomatites are thus interpreted as fragments of Pan-African magmatic detritus incorporated in the vein structures by buoyant hydrothermal fluids. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
hal-02114399; https://hal.uca.fr/hal-02114399 |
| DOI: |
10.1007/s00710-015-0389-z |
| Availability: |
https://hal.uca.fr/hal-02114399; https://doi.org/10.1007/s00710-015-0389-z |
| Accession Number: |
edsbas.C7EF6CBE |
| Database: |
BASE |