RT Journal Article
T1 The Villaviciosa tufa: a scale model for an active cool water tufa system, Guadalajara (Spain)
A1 Melón, Pablo
A1 Alonso-Zarza, Ana María
AB The Villaviciosa tufa building, on the banks of the Tajuña River, central Spain, is a recent perched springline tufa with four architectural elements: cascades, pools, channels, and barrages. The facies of the tufa building are LMC (low magnesium calcite) framestones of bryophytes, hanging stems, charophytes, phytoclastic rudstones, and rudstones of oncoids. Isotopic analyses give δ13C values ranging from − 8.05 to − 10.3‰ VPDB, and δ18O values from − 6.9 to − 7.45‰ VPDB. These values are in the range of most common tufa systems and such a short range of values is consistent with the Villaviciosa tufa building’s reduced dimensions. The mechanisms involved in precipitation vary within the building’s different environments, as reflected in the isotopic composition of the samples. Non-biogenic degassing values in cascade deposits (framestones ofbryophytes) are the heaviest, whereas in pools, dominated by biogenic degassing, values for framestones of charophytes and phytoclasts are the lightest. Microbial bio-mediation is also strongly influenced by the development of oncoid, stromatolite, and bryophyte framestones. Temperature variation throughout the system of approximately 3 °C is not clearly reflected in the isotope signals. In short, in spite of the reduced dimensions of this tufa deposit, its notable environmental, facies, and geochemical variations may aid not only in the interpretation of detail of other tufa systems but also in the discussion of detailed facies analyses in paleoclimatic interpretations of this type of deposits.
PB Springer-Verlag
SN 1612-4820
YR 2018
FD 2018-01
LK https://hdl.handle.net/20.500.14352/11983
UL https://hdl.handle.net/20.500.14352/11983
LA eng
NO Ministerio de Ciencia e Innovación (MICINN)
DS Docta Complutense
RD 15 may 2024