CJEES

Home
Peer Review
Editorial Board
Instructions
Online First
Latest Issue
Past Issues
Contact
Impact Factor
Reject Rate

 
You are here: Home » Past Issues » Volume 7, 2012 - Number 4 » APATITE AS A PETROGENETIC INDICATOR OF VARISCAN GRANITOIDS IN TISZA MEGA-UNIT (SOUTH HUNGARY)


« Back

György BUDA1 & Elemér PÁL-MOLNÁR2
1Department of Mineralogy, Eötvös Loránd University, H-1117 Budapest, Pázmány P. str. 1/C, Hungary
2Department of Mineralogy, Geochemistry and Petrology, University of Szeged, H-6701 Szeged, P.O. Box 651, Hungary (palm@geo.u-szeged.hu)

APATITE AS A PETROGENETIC INDICATOR OF VARISCAN GRANITOIDS IN TISZA MEGA-UNIT (SOUTH HUNGARY)

Full text

Abstract:

Apatite is an excellent indicator of the origin of granitoid rocks. Two types of granitoids occur in Tisza Mega-Unit, south Hungary: one is in Kunságia (Mórágy Subunit); the other is in Békésia Unit (Battonya Subunit). Both granitoids contain apatite as accessory mineral. Apatite in metaluminous granitoids of Mórágy Subunit is characterized by REE- (Ce enriched) and chlorine-bearing fluorapatite, depleted in Mn, and is zoned, acicular, or prismatic with rather small grain sizes that are almost inclusion-free. In Battonya Subunit apatite is found in basic quartz monzodiorite and it is acicular and Mn-free; in the peraluminous granitoids it is Mn-rich, low REE-bearing, chlorine-poor, and unzoned, containing monazite and zircon inclusions, with stubby habit and large grain sizes. The two contrasting chemistries, textures, and crystal habits of apatite are due to the different origins of the granitoid melts. In Mórágy Subunit the I-type granitoids crystallized at higher temperature and therefore the oxidized Mn3+ could not enter in the apatite structure, and due to the low Al-content of the melt, REEs entered the allanite and apatite, whereas in the majority of Battonya Subunit the S-type granitoid melt had a lower temperature and consequently Mn2+ entered the apatite structure, substituting for Ca2+, and at first monazite crystallized from the peraluminous melt, consuming REEs from the melt, causing depletion in the REEs of apatite, and the sedimentary origin probably caused chlorine depletion.


Keyword: granitoids, apatite, I-type, S-type, Variscan, Mórágy Subunit, Battonya Subunit, Hungary


(c) 2006 - 2017, Earth and Environmental Team
Design by Adrian Dorin