Алтай бүрдлийн Зүүн Булган массивын минералоги, петрографи, петрохимийн судалгаанд

Abstract

Altay complex in Mongolian Altay terrane has distinguished first Marinov et al. (1963). Intrusion bodies of Altay complex located in Western Mongolia, directing from north-west to south-east and are by gabbro, diorite and granite.

Thin section for Zuun (East) Bulgan massive is showing hornblende - pyroxene gabbro-diabase, biotite granite, leucogranite and biotite - hornblende diorite that are small to medium grained last three, respectively for I-IV facies. The genesis of this massive is S-type granite during collision. The granites have a wide compositional range, with SiO₂ (68.14-77.1) increasing, relatively low TiO₂ (0.21-0.68), Al₂O₃ (11.95-15.23), Fe(t) (1.26-4.63), MgO (0.06-1.57), CaO (0.47-2.09) and high K₂O (2.96-5.14), constant P₂O₅ (0.04-0.22) contents.

Heavy - concentrate mineralogical analysis for Zuun (East) Bulgan massive is presented high magnetite (0.01 gr), ilmenite (0.01 -2.01 gr), sphene (0.01 gr) and zircon (Fig. 7b), low anatase (Fig. 7f), apatite (Fig. 7e), pyrite (Fig. 7e), barite (Fig. 7a), monacite, rutile (Fig. 7d) and Ta-Nb mineral contents.