Pre-Alpine basement within the Northern Cycladic Blueschist Unit on Syros Island, Greece

被引：24

作者：

Tomaschek, Frank ^{[1
]}

Keiter, Mark ^{[1
]}

Kennedy, Allen K. ^{[2
]}

Ballhaus, Christian ^{[3
]}

机构：

[1] Univ Munster, Inst Mineral, D-48149 Munster, Germany

[2] Curtin Univ Technol, John de Laeter CEMS, Bentley, WA 6102, Australia

[3] Univ Bonn, Steinmann Inst Geol Mineral & Palaontol, D-53115 Bonn, Germany

来源：

ZEITSCHRIFT DER DEUTSCHEN GESELLSCHAFT FUR GEOWISSENSCHAFTEN | 2008年 / 159卷 / 03期

关键词：

Syros; Attic-Cycladic Cystalline Complex; pre-Alpine basement; U-Pb zircon geochronology;

D O I：

10.1127/1860-1804/2008/0159-0521

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The main lithological sequence on Syros Island forms part of the Blueschist Unit within the Attic-Cycladic Crystalline Complex in the Hellenides. The structurally lowermost outcrops in SW Syros expose minor occurrences of intensely deformed K-feldspar megacryst augen gneisses. Ion microprobe U-Pb zircon geochronology yielded a range of single spot ages between similar to 331 to 299 Ma. Based on cathodoluminescence criteria, an age of 3 15 3 Ma is interpreted to approximate the magmatic crystallization of the granitic protolith. The magmatic protolith age correlates with the age of granitoid intrusions well documented from pre-Alpine basement units of the southern Cycladic Islands. The studied orthogneiss provides the first evidence that remnants of a Variscan consolidated crust are preserved within the Blueschist Unit of the northern Cyclades.

引用

页码：521 / 531

页数：11

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