**Abstract**

The Central Bohemian magmatic complex belongs to the Central European Variscan belt. The granitic rocks of this plutonic complex are formed by several suites of granites, granodiorites, and tonalites, together with small bodies of gabbros, gabbro diorites, and diorites. The granodiorites of the Blatná suite are high-K, calc-alkaline to shoshonitic, and metaluminous to slightly peraluminous granitic rocks. Compared to the common I-type granites, granodiorites of the Blatná suite are enriched in Mg (1.0– 3.4 wt.% MgO), Ba (838–2560 ppm), Sr. (257–506 ppm), and Zr (81–236 ppm). For granodiorites of the Blatná suite is assemblage of apatite, zircon, titanite, and allanite significant. Zircon contains low Hf concentrations (1.1–1.7 wt.% HfO2). The composition of titanite ranges from 83 to 92 mol.% titanite end-member. Allanite is relatively Al-poor and displays Feox. ratio 0.2–0.5.

**Keywords:** granodiorite, I-type granite, accessory minerals, apatite, zircon, titanite, allanite, Bohemian Massif, Central European Variscides

## **1. Introduction**

The main carriers of rare-earth elements (REE), uranium, thorium, and zirconium in granitic rocks are usually different accessory minerals, including apatite, zircon, monazite, xenotime, and allanite. However, more detailed information about the assemblage and composition of these accessories is often missing. The granitic rocks of the Blatná suite are part of relatively bigger the Central Bohemian magmatic complex. This magmatic complex represents one of the biggest Variscan magmatic bodies in the Central European Variscides. This magmatic complex is formed by several suites of granodiorites, tonalites, and granites. The Blatná suite is represented by the Blatná hornblende-bearing biotite granodiorites and the Červená hornblende-biotite granodiorites. The accessory minerals assemblage is in a both granodiorites represented by apatite, zircon, titanite and allanite. The presented study is concentrated on comprehensive petrological and geochemical description of the Blatná suite and detailed investigation of accessory minerals assemblage that occurred in this magmatic suite, which is represented by the occurrence of apatite, zircon, titanite, and allanite.
