Metamorfní charakteristika exokontaktu jihlavského plutonu v profilu řeky Jihlavy

Mgr. Vladimír Zbranek

Master's thesis

Abstract:

Diplomová práca mi bola zadaná na jar v roku 2004 ústavom geologických vied MU v Brne. Jej názov je: Metamorfná charakteristika exokontaktu jihlavského plutónu v profile rieky Jihlavy. Cieľom bolo spracovať podrobnú petrografickú charakteristiku metapelitov a migmatitov vystupujúcich na exokontakte jihlavského plutónu v profile rieky Jihlavy. Na základe výsledkov získaných z petrografického štúdia kontaktných hornín som sa pokúsil odhadnúť tlakové a teplotné podmienky intrúzie durbachitov do jihlavského plutónu a zistiť aký to malo dopad na okolité horniny. Následne som sa pokúsil porovnať výsledky tlakovoteplotného vývoja exokontaktu s tlakovoteplotným vývojom kier metamorfitov uzavieraných v horninách plutónu.

Abstract:

Methamorphic characteristic of exocontact of jihlava pluton in profile of jihlava river This paper deals with a detailed petrographic description of metapelites and migmatites occuring at the exocontact of the Jihlava pluton in the pattern of river Jihlava. It attempts to study the processes at the contact between metapelites and granitic rocks of the Jihlava pluton. the point of contact. In the paper, I tried to estimate p,T conditions of the influence of the Jihlava pluton. The reaction on endocontact Opx + Kf + H2O Bt + Q, similarly as the replacement of the primary clinopyroxene by amphibole documents the transition from the conditions of granulite facie, in which the Jihlava pluton durbachite probably intruded into conditions of the amphibolite facie. On the contrary, on the exocontact side, the probable reaction Bt+pl+Qtz = Opx+L+K-f+grt in metapelites documents the influence of durbachite intrusion in the conditions of granulite facie. Further reactions on the exocontact side Grt Crd , Crd + L ( K- feldspar) Sill + Bt + Qtz document reverse transition into conditions of the amphibolite facie. On the basis of comparison to the experiments carried out by Vielzef &. Montel (1994), the thermal conditions can be estimated at = 800 - 850 C and P > 5 kbar. Further then, monazites from migmatites have been analysed and the age of rocks was detected (329.8 9.5 Ma). The age of particular rocks were compared to the results at hand. All of the ages are relatively similar, which implies that the whole massif has been developing gradually and that in the conclusion a body of durbachite penetrated the area, creating contact fringe in the pluton.

Keywords

keywords, exocontact, endocontact, intrusion

Language used: Czech

Date on which the thesis was submitted / produced: 25. 5. 2006

Thesis defence

• Date of defence: 12. 6. 2006
• Supervisor: doc. RNDr. Jaromír Leichmann, Dr.

Masaryk University

Faculty of Science

Master programme / field:
Geology / Geology, Hydrogeology and Geochemistry