Evidence for a "Cadomian" ophiolite and magmatic-arc complex in SW Bulgaria
Date
2012
Authors
Kounov, Alexandre
Graf, Johannes
von Quadt, A.
Bernoulli, Daniel
Burg, Jean-Pierre
Seward, Diane
Ivanov, Zivko
Fanning, Christopher
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Elsevier
Abstract
New geochronological and geochemical data from the magmatic rocks of the Kraishte area (SW Bulgaria) reveal the existence of Cadomian arc magmatism intruding an ophiolitic complex. Similar geochemical signatures and crystallization ages of the basic to acidic rocks of the Struma Unit and the Osogovo-Lisets Complex suggest that these rocks were derived from one calc-alkaline magma source. They were parts of a magmatic arc associated during Ediacaran-Early Cambrian (560-540. Ma) times with subduction of the Proterozoic Prototethys Ocean. The geochemical analysis of the coeval calc-alkaline granitic magmatism (577-551. Ma) in the Morava Nappe reveals a trend from a within-plate towards volcanic-arc affinity.
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Keywords
Keywords: Cadomian orogeny; calc alkaline rock; Cambrian; crystallization; Ediacaran; geochronology; magma chemistry; magmatism; nappe; ophiolite; plate motion; uranium-lead dating; zircon; Bulgaria; Kraishte Bulgaria; Cadomian orogen; Kraishte; Magmatic arc; Ophiolites; U/Pb zircon analysis
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Precambrian Research
Type
Journal article
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2037-12-31
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