Origin and distribution of calcite cements in a folded fluvial succession: The Puig‐reig anticline (south‐eastern Pyrenees)

As one of the predominant diagenetic products in clastic rocks, calcite cements are typical fingerprints cement-forming fluids and key controls on reservoir quality. The Puig-reig anticline, south-eastern Pyrenees (Spain), exposes excellent outcrops conglomerates, sandstones claystones, which were deposited from a proximal to medial fluvial system underwent folding, fracturing cementation. This anticline constitutes an appropriate case study investigate origin distribution during folding evolution how they affect Based structural, petrographic geochemical analyses (carbon, oxygen, strontium clumped isotopes elemental composition), five generations (‘Cc0’ ‘Cc4’) have been identified, filling intergranular porosity host faults four fracture sets (F1 F4). Calcite cement Cc0 precipitated meteoric phreatic zone early stage. During most intense phase thrusting Cc1 porosity, F1 F4 hydrothermal that migrated deeper areas Pyrenean chain. late stage fold growth, Cc2 their associated fractures crest but at shallower burial depths than Cc1. Cc3 mainly with same strike as north-western part formation probably through frontal thrust Pyrenees. continuous denudation, Cc4 across anticline. Results indicate foreland basin margins, external coeval compressional deformation and/or alteration detrital carbonates contribute intensive can result overall occlusion significantly damaged