Ilmenit a baddeleyit z metagabra ze Špičáku u Deštné v Orlických horách, Česká republika
| Title in English | Ilmenite and baddeleyite in metagabro from Špičák near Deštné in Orlické hory, Czech Republic |
|---|---|
| Authors | |
| Year of publication | 2015 |
| Type | Article in Periodical |
| Magazine / Source | Acta Mus. Moraviae, Sci. geol. |
| MU Faculty or unit | |
| Citation | |
| Field | Geology and mineralogy |
| Keywords | baddeleyite;ilmenite;accessory minerals;metagabbro;Bohemian Massif |
| Description | Two types of metagabbro from Špičak near Deštne in Orlicke hory were studied. The metagabbro formed in the upper crust – based on the amphibole barometer and thermometer the pressure about 3 kbar and temperature 880 °C are assumed. The rock had low oxygen fugacity QFM -0.7. The primary assemblage of pyroxene, amphibole, plagioclase and ilmenite was significantly affected by the late alteration event (500 °C). Accessory minerals include ilmenite, apatite, titanite, pyrrhotite, zircon, sphalerite, baddeleyite, rutile and cobaltite. The main accessory mineral is ilmenite (9–12 % vol.), often rimmed by younger titanite. Light coarse grained metagabbro contains baddeleyite with unusual content of Sr (1.65–2.05 wt. % SrO), the baddeleyite from dark medium grained metagabbro does not contain Sr. Based on recognized condition of metagabbro formation and evolution, the baddeleyite is assumed to be a primary mineral of the magmatic origin. |