Journal
INTERNATIONAL JOURNAL OF EARTH SCIENCES
Volume 107, Issue 5, Pages 1579-1601Publisher
SPRINGER
DOI: 10.1007/s00531-017-1559-5
Keywords
Stratigraphy; Carbonate production; Volcanism; Geochemistry; LA-ICP-MS U-Pb dating; West Gondwana
Categories
Funding
- RGF program of the French Geological Survey (BRGM)
- Spanish MINECO [CGL2013-48877-P, CGL2015-66335-C2-1-R]
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The volcanism hosted by the Ediacaran-Terreneuvian Canaveilles Group of the Eastern Pyrenees displays two distinct geochemical affinities: (1) metabasites of the Nyer and Olette formations reflect the emplacement of a tholeiitic magmatism linked to extensional conditions, whereas (2) subsequent felsic and calc-alkaline magmatic rocks marking the top of the Olette Formation and forming the overlying Fabert and Finestrelles members represent Cadomian magmatic events. Based on U-Pb zircon dating constraints, palaeotopographic relationships linked to onlap geometries and distance from vent sources, three volcanosedimentary edifices can be distinguished, the so-called TregurA (ca. 565-552 Ma), Cap de Creus (ca. 558 Ma) and Coll d'Ares (ca. 542-532 Ma) edifices. The top of their palaeoreliefs recorded locally the nucleation of centres of microbial carbonate productivity (Puig Sec Member) linked to synsedimentary tilting and karstification. Throughout West Gondwana, the presence of carbonate production across the Ediacaran-Cambrian transition is exclusively located in back-arc settings (Central-Iberian Zone) and areas far from the Cadomian subduction trench and devoid of significant terrigenous input, such as those reported in the Eastern Pyrenees and the neighbouring Montagne Noire.
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