Microbial mediation as a possible mechanism for natural dolomite formation at low temperatures

  title={Microbial mediation as a possible mechanism for natural dolomite formation at low temperatures},
  author={Cris{\'o}gono Vasconcelos and Judith A. Mckenzie and Stefano Michele Bernasconi and Djordje Grujic and Albert
J. Tiens},
DOLOMITE (CaMg(CO3)2) is a common carbonate mineral which is found in much greater abundance in ancient rocks than in modern carbonate environments. Why this is so remains a mystery. Over the past 30 years, dolomite formation has been observed in several modern environments, and various thermodynamic, kinetic and hydrological factors have been proposed to explain its formation1,2. But attempts to precipitate dolomite at low temperatures in the laboratory have been unsuccessful3,4, and the… 
Surface chemistry allows for abiotic precipitation of dolomite at low temperature
Results indicate that natural surfaces, including organic matter and microbial biomass, possessing a high density of carboxyl groups may be a mechanism by which ordered dolomite nuclei form, and suggest that sharp biogeochemical interfaces that promote microbial death, as well as those with high salinity may, in part, control car boxyl-group density on organic carbon surfaces.
Microbial dolomite formation within exopolymeric substances
Dolomite (CaMg(CO3)2) is a common mineral in sedimentary rocks, whose origin has long been debated. Dolomite formation at low temperatures appears to occur in association with microbial activity.
Aerobic microbial dolomite at the nanometer scale : Implications for the geologic record
Microbial experiments are the only proven approach to produce experimental dolomite under Earth's surface conditions. Although microbial metabolisms are known to induce dolomite precipitation by
Microbially catalyzed dolomite formation: From near-surface to burial
Sedimentary dolomite: a reality check
Abstract The failure to precipitate dolomite experimentally at low temperatures or from seawater in which it is both supersaturated and the most thermodynamically favoured carbonate phase, together
Dolomite formation and biogeochemical cycles in the Phanerozoic
Based on present knowledge of the purely chemical controls on the kinetics of massive dolomite formation, the abundance and distribution of dolomite throughout the Phanerozoic remains an enigma,


The dolomite problem: Stable and radiogenic isotope clues
At what time(s) in the history of a sediment did dolomite form? What kinds of solutions were involved? Were conditions (e.g. temperature, ocean composition) at the earth's surface different than they
Controversies in Modern Geology: Evolution of Geological Theories in Sedimentology, Earth History and Tectonics
An appreciation of Professor Kenneth Jinghwa Hsu, S.Schlanger fractal geometry of a career - a word of thanks, K.J.Hsu. Introduction - controversy and geologic theory, D.W.Mueller et al. Part 1
Dolomites : a volume in honour of Dolomieu
1. IntroductionProblems, Progress And Future Research Concerning Dolomites And DolomitizationDolomieu And The First Description Of DolomiteSummary2. Sabkha, Evaporitic And Reflux Dolomitization
Concepts and Models of Dolomitization
Special Publication 28 has its roots in the 22nd Annual Research Symposium of SEPM entitled Concepts and Models of Dolomitization – Their Intricacies and Significance held on April 3,1979 in Houston,
Sedimentary Carbonate Minerals
A. Introduction: The Role of Mineralogy in the Petrology of Sedimentary Carbonates.- B. Crystal Chemistry of Sedimentary Carbonate Minerals.- I. Calcite-Type Minerals (Rhombohedral Carbonates).- 1.