La formación Dolomías de Landete (Triasico Medio). Un ejemplo de rampa somera, su evolución y diagénesis. Provincias de Cuenca y Valencia, España

Abstract

The Dolomites of Landete Formation (d.L.) (Scythian-Anisian) are the first carbonate sediments that appear along the Triassic succesion in the SE of the lberian Ranges, Province of Cuenca, Central Spain. To analyze the d.L., nine sections have been studied across the entire area, showing a great difference in the thickness (from 1,5 m. to 48 m.). The study of the d.L. has been performed through facies differenciation, vertical distribution and facies assofiations, whose analysis and interpretation have allowed us to differenciate different subenvironments of a shallow carbonated rampo The sedimentation was influenced by the reactivation of a Cormer late hercinian tectonic trendy with tectonic of blocks. Two different episodes can be differenciated in the development of the depositional system: A first, short episode with an important subsidence rate corresponding to a very rapid transgression and a longer and more stable second one with progradational character. The professes of dolomitization are very important and it is possible to distinguish three main types: A first stage of mixing water dolomitization. A second one of penecontemporaneous dolomitization in relationship with an important development of sabkbas, and finally, a deep burial type characterized by Cerroan dolomite.