MIDDLE PERMIAN TELODIAGENETIC PROCESSES IN NEOPROTEROZOIC SEQUENCES, TANDILIA SYSTEM, ARGENTINA

PATRICIA EUGENIA ZALBA, MARCELO MANASSERO, EMMANUEL LAVERRET DANIEL BEAUFORT, ALAIN MEUNIER, MARTÍN MOROSI AND LAURA SEGOVIA

Journal of Sedimentary Research

SEMP Society for Sedimentary Geology

Lugar: Boulder, Colorado; Año: 2007 vol. 77 p. 525 - 538

Journal of Sedimentary Research; June 2007; v. 77; no. 6; p. 525-538; DOI: 10.2110/jsr.2007.049 © 2007 SEPM Society for Sedimentary Geology   Research Articles: Siliciclastic Diagenesis Middle Permian Telodiagenetic Processes in Neoproterozoic Sequences, Tandilia System, Argentina Patricia Eugenia Zalba1, Marcelo Manassero2, Emmanuel Laverret3, Daniel Beaufort4, Alain Meunier5, Martín Morosi6 and Laura Segovia7 1 Comisión de Investigaciones Científicas Provincia de Buenos Aires—CETMIC—Facultad de Ciencias Naturales y Museo de La Plata, Camino Centenario y 506, Manuel Benito Gonnet 1897, Argentina; pezalba@cetmic.unlp.edu.ar <!-- var u = "pezalba", d = "cetmic.unlp.edu.ar"; document.getElementById("em0").innerHTML = '<a href="mailto:' + u + '@' + d + '">' + u + '@' + d + '<\/a>'//--> 2 CONICET-Centro de Investigaciones Geológicas, Facultad de Ciencias Naturales y Museo de La Plata, Calle 1 #644, La Plata 1900, Argentina3 CV-associés, 225 Rue Gaston Doumergue, 31170 Tournefeuille, France4 Université de Poitiers—HYDRASA, 40 Avenue Recteur Pineau, Poitiers 86022, France5 Université de Poitiers—HYDRASA, 40 Avenue Recteur Pineau, Poitiers 86022, France6 Comisión de Investigaciones Científicas Provincia de Buenos Aires—CETMIC—Facultad de Ciencias Naturales y Museo de La Plata, Camino Centenario y 506, Manuel Benito Gonnet 1897, Argentina7 Comisión de Investigaciones Científicas Provincia de Buenos Aires—CETMIC—Facultad de Ciencias Naturales y Museo de La Plata, Camino Centenario y 506, Manuel Benito Gonnet 1897, Argentina In the Tandilia Basin, Buenos Aires Province, Argentina, we study the genesis of mud beds and pipes in the Loma Negra Formation (limestones), Sierras Bayas area, together with the emplacement of alunite and aluminum phosphate sulfate (APS) minerals in the Las Aguilas Formation, Barker area. All these features arerelated to basin inversion, uplift, erosion, and injection or expulsion, or infiltration of fluids and oxidation reactions in the exhumed rocks during a telodiagenetic stage. On the basis of K–Ar dating of alunite in the Las Aguilas Formation (claystones) giving an age of 254 ± 7 Ma (middle Permian), these processes are considered to be linked to a major geological event which affected these Neoproterozoic lithostratigraphic units: the folding of the Ventania System, located 150 km to the SW of the study area.