RT Journal Article
T1 Depósitos de magnesita en la Cuenca de Calatayud: facies yasociaciones mineralógicas
A1 Pozo, M.
A1 Sanz Rubio, E.
A1 Rodríguez Aranda, Juan Pablo
A1 Casas Sainz de Aja, J.
A1 Calvo Sorando, José Pedro
A1 Cañaveras, Juan Carlos
AB Sedimentary magnesite is largely present in the Miocene evaporite formations (Lower and Intermediate units) of the Calatayud Basin (NE Spain). Magnesite deposits are forming part of sedimentary sequences corresponding to hypersaline and moderate-to-high concentrated saline lakes. Both field and mineralógica! studies show that magnesite is associated with a wide range of lithofacies, but most commonly with phyllosilicates and gypsum. Trioctahedral clay minerals (Mg-smectites) were identified in mudflat environments of the hypersaline Lower Unit, probably formed by transformation of inherited phases in Mg and Si-rich saline-alkaline environments. Moderate to well ordered smectites (diocta-trioctahedral) in green clay lithofacies in absence of magnesite suggest a genetic competition forming magnesite or Mg-smectite. In contrast, the exclusive presence of illite associated with interestratified illite/smectite in sequences that correspond to moderate-to-high concentrated saline lakes could result from illitization processes of smectites in Mg-K-rich environments, under periodical dry/wet cycles.
PB Sociedad Geológica de España.
SN 1576-5172
YR 2000
FD 2000
LK https://hdl.handle.net/20.500.14352/57966
UL https://hdl.handle.net/20.500.14352/57966
LA spa
DS Docta Complutense
RD 9 abr 2025