Crustal recycling and juvenile addition during lithospheric wrenching: The Pontivy-Rostrenen magmatic complex, Armorican Massif (France), Variscan belt
作者： C. Ballouard , M. Poujol , P. Boulvais , A. Zeh
关键词: Shear zone 、 Geology 、 Zircon 、 Partial melting 、 Massif 、 Strike-slip tectonics 、 Magmatism 、 Crust 、 Crustal recycling 、 Geochemistry
摘要: Abstract The South Armorican Shear Zone (SASZ), in the French Variscan belt, is a lithospheric wrench fault that acted during Late Carboniferous as transition zone between two distinct domains: thickened domain to south affected by extension and crustal magmatism, weakly north subjected dextral wrenching crust- mantle-derived magmatism. Pontivy-Rostrenen complex composite intrusion emplaced along SASZ. To south, made of leucogranites whereas, north, monzogranites outcrop together with small intrusions quartz monzodiorite. U-Pb dating magmatic zircon LA-ICP-MS reveal most rocks were at ca. 315 Ma (between 316.7 ± 2.5 Ma 310.3 ± 4.7 Ma), excepted late leucogranitic was 304.7 ± 2.7 Ma. (− 4.8 1.1) formed partial melting metasediments peraluminous orthogneisses. monzogranite (− 4.0
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