RT Journal Article
T1 Reaction pathways towards the formation of dolomite-analogues at ambient conditions
A1 Pimentel, Carlos
A1 Pina Martínez, Carlos Manuel
AB In this paper we present results of a study of the crystallisation behaviour of the dolomite-analogues norsethite and PbMg (CO3)2 at room temperature and atmospheric pressure. Whereas precipitation of norsethite was previously obtained by mixing solutions (Hood et al., 1974; Pimentel and Pina, 2014a,b), we report, for the first time, the synthesis of PbMg(CO3)2 by using the same method. The formation of both phases was promoted by ageing slurries for periods of time ranging from a few days (norsethite) up to 6 months (PbMg(CO3)2). The crystallisation of both norsethite and PbMg(CO3)2 occurs by sequences of dissolution–precipitation reactions involving several amorphous and crystalline precursor phases, which were identified and characterised by X-ray diffraction and scanning electron microscopy. Depending on the initial composition and Ba:Mg and Pb:Mg ratios in the slurries, different precursors and reaction kinetics were observed. This demonstrates the existence of different reaction pathways towards the formation of the investigated dolomite-analogues. Our experimental results provide new insights into the possible mechanisms of formation of dolomite and other double carbonates in nature.
PB Elsevier
SN 0016-7037
YR 2016
FD 2016
LK https://hdl.handle.net/20.500.14352/23545
UL https://hdl.handle.net/20.500.14352/23545
LA eng
NO Ministerio de Economía y Competitividad (MINECO)
DS Docta Complutense
RD 20 abr 2025