Speaker
Tod Waight
Institute
University of Copenhagen, Denmark
Time & Place
Tue, 14 Feb 2023 12:00:00 NZDT in ER 263
Abstract
The Ketilidian Orogen in South Greenland represents a continental arc and part of the Great Proterozoic Accretionary Orogeny. It is subdivided into the Central Domain – dominated by I-type granites of the Julianehåb Igneous Complex (1.85-1.80 Ga) - and the Southern Domain – forearc sediments metamorphosed to amphibolite and granulite facies at 1.79-1.76 Ga and subsequently intruded by rapakivi granites of the Ilua Suite (1.75-1.73 Ga). This presentation focuses on how U-Pb geochronology and Hf and O isotope compositions of zircons from the main lithologies can identify both growth of new crust, and reworking of existing crust.
