Geochemistry of Granitic Rocks

**3**

**Chapter 1**

*Miloš René*

**Abstract**

granitic rocks.

**1. Introduction**

Massif

Geochemistry of Granitic Rocks

Granitic rocks of the Moldanubian batholith are represented by four magmatic

suites: I- to S-type Weinsberg biotite granites-granodiorites, S-type Eisgarn two-mica granites, S-type Melechov/Zvůle two mica, highly fractionated granites and I/S-type Freistadt biotite granites-granodiorites. The biotite granites of the Weinsberg suite are subaluminous to weakly peraluminous granites, enriched in Ba, Sr, and Zr. The two-mica granites of the Eisgarn suite are represented by a peraluminous, the low-Th Deštná granites, intermediate-Th Mrákotín, Číměř/ Aalfang granites, and the high-Th Lipnice/Steinberg granites. The alkali feldspar and two-mica granites of the Melechov/Zvůle suite are highly fractionated, peraluminous granitic rocks, depleted especially in Ba, Zr, and Th. The granites to granodiorites of the Freistadt suite are subaluminous on Ba- and Sr-enriched

**Keywords:** granitic rocks, petrology, geochemistry, Moldanubian zone, Bohemian

Generation of granitic rocks batholiths and plutons is a characteristic late-stage feature in the evolution of collisional orogens [1–4]. One of the classic examples is the European Variscan Belt, produced as a result of the late Palaeozoic convergence of Gondwana and Laurussia. The Moldanubian batholith that forms one of the largest plutonic complexes within the European Variscan Belt, covering 10,000 km<sup>2</sup> in the central part of the Moldanubian Zone of the Bohemian Massif, provides an excellent insight into origin and evolution of such crustally derived magmas [5–10]. The most significant previous geochemistry studies of the Moldanubian batholith are concentrated in papers Liew et al., Vellmer and Wedepohl, and Breiter [5, 6, 9]. However, these papers are concentrated only on selected parts

The aim of the presented paper is detailed classification of individual magmatic suites of the whole Moldanubian batholith and description of petrology,

(the Austrian and South Bohemian) of this batholith.

geochemistry, and origin of its magmatic suites.

of the Moldanubian Batholith

(Central European Variscides)

#### **Chapter 1**
