Titanite composition and SHRIMP U–Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites, the Western Carpathians
Titanite belongs to the common accessory minerals in Variscan (~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 (~0.5 to 10 mm in...
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Earth Science Institute, Slovak Academy of Sciences, Slovakia
2019-12-01
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| Series: | Geologica Carpathica |
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| Online Access: | http://www.degruyter.com/view/j/geoca.2019.70.issue-6/geoca-2019-0026/geoca-2019-0026.xml?format=INT |
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| author | Uher Pavel Broska Igor Krzemińska Ewa Ondrejka Martin Mikuš Tomáš Vaculovič Tomáš |
| author_facet | Uher Pavel Broska Igor Krzemińska Ewa Ondrejka Martin Mikuš Tomáš Vaculovič Tomáš |
| author_sort | Uher Pavel |
| collection | DOAJ |
| description | Titanite belongs to the common accessory minerals in Variscan (~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 (~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; ≤4.8 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+ = Ca2+ + Ti4+, 2REE3+ + Fe2+ = 2Ca2+ + 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 ~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 (~650–750 °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 (~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. |
| first_indexed | 2024-12-17T07:21:19Z |
| format | Article |
| id | doaj.art-621220883f5b4bba987fc96afd30fa01 |
| institution | Directory Open Access Journal |
| issn | 1336-8052 |
| language | English |
| last_indexed | 2024-12-17T07:21:19Z |
| publishDate | 2019-12-01 |
| publisher | Earth Science Institute, Slovak Academy of Sciences, Slovakia |
| record_format | Article |
| series | Geologica Carpathica |
| spelling | doaj.art-621220883f5b4bba987fc96afd30fa012022-12-21T21:58:45ZengEarth Science Institute, Slovak Academy of Sciences, SlovakiaGeologica Carpathica1336-80522019-12-0170644947010.2478/geoca-2019-0026geoca-2019-0026Titanite composition and SHRIMP U–Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites, the Western CarpathiansUher Pavel0Broska Igor1Krzemińska Ewa2Ondrejka Martin3Mikuš Tomáš4Vaculovič Tomáš5Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Ilkovičova 6, 842 15 Bratislava, SlovakiaEarth Science Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 840 05 Bratislava, SlovakiaPolish Geological Institute – National Research Institute, Rakowiecka Street 4, 00-975Warszawa, PolandDepartment of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Ilkovičova 6, 842 15 Bratislava, SlovakiaEarth Science Institute, Slovak Academy of Sciences, Banská Bystrica branch, Ďumbierska 1, 974 01 Banská Bystrica, SlovakiaDepartment of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00Brno, Czech RepublicTitanite belongs to the common accessory minerals in Variscan (~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 (~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; ≤4.8 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+ = Ca2+ + Ti4+, 2REE3+ + Fe2+ = 2Ca2+ + 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 ~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 (~650–750 °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 (~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.http://www.degruyter.com/view/j/geoca.2019.70.issue-6/geoca-2019-0026/geoca-2019-0026.xml?format=INTtitanitei-type graniteszr-in-titanite thermometryla–icp–ms analysesshrimp u–pb datingwestern carpathians |
| spellingShingle | Uher Pavel Broska Igor Krzemińska Ewa Ondrejka Martin Mikuš Tomáš Vaculovič Tomáš Titanite composition and SHRIMP U–Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites, the Western Carpathians Geologica Carpathica titanite i-type granites zr-in-titanite thermometry la–icp–ms analyses shrimp u–pb dating western carpathians |
| title | Titanite composition and SHRIMP U–Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites, the Western Carpathians |
| title_full | Titanite composition and SHRIMP U–Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites, the Western Carpathians |
| title_fullStr | Titanite composition and SHRIMP U–Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites, the Western Carpathians |
| title_full_unstemmed | Titanite composition and SHRIMP U–Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites, the Western Carpathians |
| title_short | Titanite composition and SHRIMP U–Pb dating as indicators of post-magmatic tectono-thermal activity: Variscan I-type tonalites to granodiorites, the Western Carpathians |
| title_sort | titanite composition and shrimp u pb dating as indicators of post magmatic tectono thermal activity variscan i type tonalites to granodiorites the western carpathians |
| topic | titanite i-type granites zr-in-titanite thermometry la–icp–ms analyses shrimp u–pb dating western carpathians |
| url | http://www.degruyter.com/view/j/geoca.2019.70.issue-6/geoca-2019-0026/geoca-2019-0026.xml?format=INT |
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