The origin of inherited zircons in mantle

Geowissenschaftliches Kolloquium
The origin of inherited zircons
in mantle-derived magmatic rocks
of the Caribbean
Donnerstag, 18. Juni 2015 - 16.15 Uhr
Yamirka Rojas-Agramonte
(Johannes Gutenberg-Universität Mainz)
Dr. Yamirka Rojas-Agramonte studied Geology in Cuba and obtained her Dr. rer. nat. degree at Salzburg University, Austria. She
is a postdoc in Mainz and came to Germany for the first time in
2004 as a Humboldt fellow. Her research focusses on zircon geochronology of arc rocks and metamorphic complexes, sedimentary
provenance studies, comparison of accretion tectonic processes in
orogenic belts of different ages and the problem of zircon inheritance in igneous rocks.
Institut für Geologische Wissenschaften
Großer Hörsaal (C.011), Haus C
Malteserstrasse 74-100
12249 Berlin
Layout: FUB GeoPal Medienbüro, Jan Evers 20150610
There is increasing recognition in recent years of old,
xenocrystic (inherited) zircons in juvenile igneous
rocks, and reports on their occurrence are no longer
considered with scepticism. The origin of such zircons
is controversially discussed, but there seems to be no
doubt that in most cases they are continent-derived,
and their presence in mantle melts suggests variable
contamination of the upper mantle with crustally-derived material. In this talk, I will present and discuss
our findings of inherited zircons in the Caribbean
(Cuba and Grenada).