Geochemistry of Y plus REE in stratiform tourmalinites and their tourmalines: implications for their genesis
| Název česky | Geochemie Y+REE ve stratiformních turmalinitech a jejich turmalínech: implikace pro jejich genezi |
|---|---|
| Autoři | |
| Rok publikování | 2013 |
| Druh | Článek ve sborníku |
| Konference | MINERAL DEPOSIT RESEARCH FOR A HIGH-TECH WORLD, VOLS. 1-4 |
| Fakulta / Pracoviště MU | |
| Citace | |
| Obor | Geologie a mineralogie |
| Klíčová slova | Y plus REE; tourmaline; stratiform tourmalinites; Bohemian Massif |
| Popis | Yttrium+REE contents in stratiform tourmalinites and their tourmaline from two different geological units, Svratka Unit and Krkonose-Jizera Unit (Bohemian Massif, Czech Republic) are reported to reveal tourmalinite genesis and tourmaline growth history. Premetamorphic tourmaline grains rimmed by younger metamorphic schorl-dravite were distinguished in both regions. The wing-shaped Y+REE patterns with minimum close to Eu in premetamorphic oxy-dravite from the Krkonose-Jizera Unit, and the Y+REE whole rock signature indicate important contribution of seawater in the oxy-dravite forming fluids. On the contrary, Y+REE patterns in premetamorphic schorl cores from the Svratka Unit correspond well to presumable exhalative origin of B-bearing fluids. Metamorphic rims of schorl-dravite at both regions show typically LREE-enriched patterns with pronounced positive Eu anomalies reflecting composition of metamorphic fluids. |
| Související projekty: |