Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)

Bohutín Tonalite Stock - An example of the small intrusion with high degree of the rock differentiation

 

Josef Klomínský

Geoscience Research Reports 44, 2011 (GRR for 2010), pages 153–157
Map sheets: Březnice (22-12)

Full text (PDF, 0.48 MB)

 

Abstract

Bohutín Tonalite Stock is the largest satelite body of the Central Bohemian Pluton ca. 6 km from its NW margin. The stock has intruded into the Neoproterozoic and Cambrian sediments of Bohemicum. ItsVariscan age similarto the Central Bohemian Pluton is also supported by Ar/Ar dating. The stock occupies the area of 3.6 km2 in erosion level and has a shape of subvertical flatten cylinder plunging in NE direction under the Neoproterozoic sediments. The stock was opened by underground workings up to the depth of al-most 1,400 m in the 25th February Mine (Bohutín Mine- now abandoned). High degree of the rock differentiation is one of the outstanding features of the Bohutín stock. Main volume of the body consists of the tonalite to quartzdiorite and upper part of the stock is occupied by granodiorite to trondhjemite with frequent large mafic enclaves.