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Mid-cretaceous palaeogeographical evolution of the central Basque-Cantabrian basin (northern Spain)

Palaeogeography Palaeoclimatology Palaeoecology
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DOI: 10.1016/0031-0182(90)90043-7


Abstract Aptian-Albian deposits are present in three distinct mountain and structural provinces of north Spain: Gorbea, Duranguesado and Aitzgorri. Facies analysis of these provinces reveals lateral transitions and vertical sequences of marine carbonates and terrigenous siliciclastics. A variety of sedimentary environments ranging from terrigenous platform (deltaic), carbonate platform and platform talus, to intraplatform basin are differentiated. Seven mixed terrigenous and carbonate cycles are recorded, from which six palaeogeographically distinct episodes have been defined: (1) a widespread earliest Aptian terrigenous platform, (2) a mid-Aptian carbonate platform, (3) an early late Aptian carbonate platform demise in Gorbea (SW) and Aitzgorri (SE) areas, (4) a late Aptian carbonate platform partial recovery in Gorbea (SW) and Aitzgorri (SE), plus isolated platform growth in the Udalaitz structural high, (5) an early Albian encroachment of the carbonate platform in the western areas, with talus clinoforms and megabreccias developing at the platform foreslopes, and (6) a mid-Albian deltaic progradation with burying of most carbonate platforms except on localized swells (Chupilatarra and Marieta).

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