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Titolo:
METEORIC CALCITIZATION OF MAGNESITE IN MIOCENE LACUSTRINE DEPOSITS (CALATAYUD BASIN, NE SPAIN)
Autore:
CANAVERAS JC; SANCHEZMORAL S; SANZRUBIO E; HOYOS M;
Indirizzi:
CSIC,MUSEO NACL CIENCIAS NAT,DEPT GEOL,JOSE GUTIERREZ ABASCAL 2 E-28006 MADRID SPAIN UNIV ALICANTE,FAC CIENCIAS,DEPT CIENCIAS TIERRA & MEDIO AMBIENTE E-03080 ALICANTE SPAIN UNIV ALCALA DE HENARES,FAC CIENCIAS,DEPT GEOL E-28871 ALCALA DE HENARES MADRID SPAIN
Titolo Testata:
Sedimentary geology
fascicolo: 3-4, volume: 119, anno: 1998,
pagine: 183 - 194
SICI:
0037-0738(1998)119:3-4<183:MCOMIM>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
KARSTIFICATION; DIAGENESIS; AUSTRALIA; ISOTOPE;
Keywords:
MAGNESITE; CALCITIZATION; EVAPORITES; DIAGENESIS; STABLE ISOTOPES; MIOCENE; CALATAYUD BASIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
J.C. Canaveras et al., "METEORIC CALCITIZATION OF MAGNESITE IN MIOCENE LACUSTRINE DEPOSITS (CALATAYUD BASIN, NE SPAIN)", Sedimentary geology, 119(3-4), 1998, pp. 183-194

Abstract

Sedimentary magnesite deposits are commonly present in evaporite successions in the Tertiary Calatayud basin (NE Spain). Outcropping evaporite sequences, mainly composed of secondary gypsum after anhydrite-glauberite, show centimetre-thick layers of magnesite passing laterally into calcite pseudospar. Petrographic and stable isotope data indicate that calcite pseudospar formed via late-stage calcitization of magnesite under near-surface conditions. Calcitization occurred by the interaction between magnesite and Ca-enriched waters derived from the dissolution of gypsum and/or glauberite. The geochemical simulation of this process, petrographic evidence, and the correlation between the magnesite/calcite ratio and the delta(18)O values of both magnesite and calcite samples across the reaction front are in agreement with the existence of neoformed O-18-depleted magnesite during the waning stages of the calcitization process. (C) 1998 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 16:09:26