| Reference Type | Journal (article/letter/editorial) |
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| Title | Geochemical constraints on the origin of phonolites from the Lužické hory Mts., the Ohře (Eger) Rift, Bohemian Massif |
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| Authors | Krmíčková, Simona | Author |
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| Krmíček, Lukáš | Author |
| Řanda, Zdeněk | Author |
| Ulrych, Jaromír | Author |
| Jelínek, Emil | Author |
| Ackerman, Lukáš | Author |
| Mizera, Jiří | Author |
| Year | 2022 (April 18) |
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| Publisher | Research Square Platform LLC |
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| URL | |
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| DOI | doi:10.21203/rs.3.rs-1562514/v1Search in ResearchGate |
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| Generate Citation Formats |
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| Original Entry | Krmíčková, S., Krmíček, L., Řanda, Z., Ulrych, J., Jelínek, E., Ackerman, L., & Mizera, J. (2022). Geochemical constraints on the origin of phonolites from the Lužické hory Mts., the Ohře (Eger) Rift, Bohemian Massif. (in press) https://doi.org/10.21203/rs.3.rs-1562514/v1 |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16098565 | Long-form Identifier | mindat:1:5:16098565:4 |
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| GUID | 0 |
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| Full Reference | Krmíčková, Simona, Krmíček, Lukáš, Řanda, Zdeněk, Ulrych, Jaromír, Jelínek, Emil, Ackerman, Lukáš, Mizera, Jiří (2022) Geochemical constraints on the origin of phonolites from the Lužické hory Mts., the Ohře (Eger) Rift, Bohemian Massif. doi:10.21203/rs.3.rs-1562514/v1 |
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| Plain Text | Krmíčková, Simona, Krmíček, Lukáš, Řanda, Zdeněk, Ulrych, Jaromír, Jelínek, Emil, Ackerman, Lukáš, Mizera, Jiří (2022) Geochemical constraints on the origin of phonolites from the Lužické hory Mts., the Ohře (Eger) Rift, Bohemian Massif. doi:10.21203/rs.3.rs-1562514/v1 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | Abstract
Geochemical and petrological data are reported for phonolites of the Lužické hory Mts. in the northeastern part of the Ohře (Eger) Rift near the junction with the Lusatian Fault. The phonolites of the Lužické hory Mts. are enriched in incompatible trace elements such as Rb, REEs, Zr, Hf, U, Th, Nb, Ta and volatile components such as F and Cl. The phonolites are significantly impoverished in Ti and P and partly also in Sr and Ba contents. The K-Ar dating of phonolites provided scattered ages in the range of 34.2 ± 1.4 to 26.7 ± 1.1 Ma. Two geochemically different phonolite types were recognized. Phonolites of type A (higher Sr > 90 ppm, Ba > 130 ppm) have following initial Sr–Nd isotope characteristics: 87Sr/86Sr = 0.7032–0.7094; εNd = 3.0–3.4, similar to those known from phonolites of the nearby České středohoří Mts. Prevailing phonolites of type B (lower Sr < 20 ppm, Ba < 60 ppm) are decoupled and show a broad range of initial 87Sr/86Sr ratios (up to 0.7142) at narrow εNd (3.2–3.9). Both phonolite types are characterized by relatively restricted variations in 206Pb/204Pb (19.2–19.5), 207Pb/204Pb (15.61–15.66) and 208Pb/204Pb (39.07–39.30), indicating their derivation from a similarly metasomatically enriched mantle source. The geochemical characteristics of the phonolites can associate with various (i) lower and higher clinopyroxene and feldspar crystallization of primary basanitic magma, (ii) degree of assimilation-fractional crystallization (AFC) processes during the magma ascent, and/or (iii) late-magmatic to post-magmatic hydrothermal contribution of incompatible elements. |
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