2026-06-28T14:57:46Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/590352024-07-30T16:08:56Zcom_20.500.14352_14col_20.500.14352_15

Diagenesis of Late Miocene micritic lacustrine carbonates, Madrid Basin, Spain Wright, V.P. Alonso Zarza, Ana María Sanz Montero, María Esther Calvo Sorando, José Pedro Mud-grade lacustrine limestones of Miocene age from the Madrid Basin, Spain, reveal varied and complex diagenetic histories. Microporous micrites occur as well as micrites with anhedral mosaics. The micrites have recrystallized from a metastable precursor, in part under sub-oxic meteoric diagenetic conditions probably before extensive karstification in the Pliocene. The absence of aragonite relics, their mainly micritic microfabric, low Sr content and covariant trend of Sr and Mg suggest that the micrites formed from mainly high-magnesian calcite muds. Lacustrine micrites can be compared to marine forms and criteria used to assess the composition of the marine precursor muds can be applied to lacustrine limestones to complement other techniques to identify original lake water compositions. 2023-06-20T18:58:44Z 2023-06-20T18:58:44Z 2023-06-20T18:58:44Z 1997 journal article https://hdl.handle.net/20.500.14352/59035 0037-0738 PII S0037-073 8(97)00059-6 eng open access Elsevier