was the only stable Ti-bearing mineral present at all temperatures.
Minerals include quartz, K-feldspar, (microperthite, microcline), plagioclase, aegirine-augite, hornblende, titanite
, epidote and magnetite.
In most of the cases, but especially in the rocks of intermediate to acid composition, the rocks show moderate to severe hydrothermal alteration, with the development of potassic minerals (sericite, K-feldspar), prehnite, and carbonates accompanied by other secondary minerals (epidote, quartz, chlorite, titanite
Accessory minerals include zircon, titanite
, apatite, and magnetite.
The most common mineral assemblage is plagioclase + quartz+hornblende + biotite with titanite
, zircon, apatite and pyrite as accessory minerals (Fig.
These authors have shown that titanite
is one of the minerals growing during deformation and thus can date deformational events.
15-1, sampled from natural outcrop close to the Raci potok) could be macroscopically described as a medium to coarse-grained, grey to red granoblastic gneiss with a weak foliation composed of K-feldspar, quartz, albite, apatite, titanite
, and hornblende (Ondra and Potmesil, 1965).
This Alpine-type deposit produced fantastic specimens of apatite-(CaF), titanite
, feldspar and quartz.
Romer and Rotzler demonstrate the importance of understanding the reaction history of metamorphic rocks for accurate interpretation of U-Pb data in metamorphic titanite
Kyanite, garnet, monazite, and amphibole are common minerals, while apatite, anatase, titanite
, corundum, pyroxene, and epidote are rare.
As shown above, the gold orebodies of the Liyuan deposit are mainly hosted within the Archaean gneisses, and plagioclase, hornblende, and ilmenite are very common in the gneisses, and the quartz, K-feldspar, titanite
, and chlorite are the typical alteration minerals that are well developed in the altered gneisses .