Titanite composition and SHRIMP U-Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites, the Western Carpathians
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00113427" target="_blank" >RIV/00216224:14310/19:00113427 - isvavai.cz</a>
Result on the web
<a href="https://content.sciendo.com/view/journals/geoca/70/6/article-p449.xml" target="_blank" >https://content.sciendo.com/view/journals/geoca/70/6/article-p449.xml</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2478/geoca-2019-0026" target="_blank" >10.2478/geoca-2019-0026</a>
Alternative languages
Result language
angličtina
Original language name
Titanite composition and SHRIMP U-Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites, the Western Carpathians
Original language description
Titanite belongs to the common accessory minerals in Variscan (similar to 360-350 Ma) metaluminous to slightly peraluminous tonalites to granodiorites of I-type affinity in the Tatric and Veporic Units, the Western Carpathians, Slovakia. It forms brown tabular prismatic-dipyramidal crystals (similar to 0.5 to 10 mm in size) in association with quartz., plagioclase, and biotite. Titanite crystals commonly shows oscillatory, sector and convolute irregular zonal textures, reflecting mainly variations in Ca and Ti versus Al (1-2 wt. % Al2O3, 0.04-0.08 Al apfu), Fe (0.6-1.6 wt. % Fe2O3, 0.02-0.04 Fe apfu), REE (La to Lu+ Y: 54.8 wt. % REE2O3, <= 0.06 REE apfu), and Nb (up to 0.5 wt. % Nb2O5, <= 0.01 Nb apfu). Fluorine content is up to 0.5 wt.% (0.06 F apfu). The compositional variations indicate the following principal substitutions in titanite: REE3++ Fe3+= Ca-2+Ti4+, 2REE(3+)+ Fe2+ = 2Ca(2+) Ti4+, and (Al,Fe)(3+)+ (OH, F)(-) = Ti4++O2-. The U-Pb SHRIMP dating of titanite reveal their Variscan ages in an interval of 351.0 +/- 6.5 to 337.9 +/- 6.1 Ma (Tournaisian to Visean); titanite U-Pb ages are thus similar to 5 to 19 Ma younger than the primary magmatic zircon of the host rocks. The Zr-in-titanite thermometry indicates a relatively high temperature range of titanite precipitation (similar to 650-750 degrees C), calculated for assumed pressures of 0.2 to 0.4 GPa and a(TiO2)=0.6-1.0. Consequently, the textural, geochronological and compositional data indicate relatively high-temperature, most probably early post-magmatic (subsolidus) precipitation of titanite. Such titanite origin could be connected with a subsequent Variscan tectono-thermal event (similar to 340 +/- 10 Ma), probably related with younger small granite intrusions and/or increased fluid activity. Moreover, some titanite crystals show partial alteration and formation of secondary titanite (depleted in Fe and REE)+allanite-(Ce) veinlets (Sihla tonalite. Veporic Unit), which probably reflects younger Alpine (Cretaceous) tectono-thermal overprint of the Variscan basement of the Western Carpathians.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10505 - Geology
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geologica Carpathica
ISSN
1335-0552
e-ISSN
—
Volume of the periodical
70
Issue of the periodical within the volume
6
Country of publishing house
SK - SLOVAKIA
Number of pages
22
Pages from-to
449-470
UT code for WoS article
000504072500001
EID of the result in the Scopus database
2-s2.0-85078219605