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Fig. 9 | Swiss Journal of Geosciences

Fig. 9

From: Geochemical constrains on dolomitization pathways of the Upper Jurassic carbonate rocks in the Geneva Basin (Switzerland and France)

Fig. 9

Schemes of the dolomitization mechanics observed in the present study in relation to the overall diagenetic evolution. From the early diagenetic dolomitization initiated through seepage-reflux, two mechanisms were observed. In path 1, the limestone underwent dissolution of CaCO3 and coarsening of the dolomite fabrics during late eogenesis and early mesogenesis (i.e. during shallow burial). The complete depletion of CaCO3 as well as the overgrowth of dolomitic cements led to the formation of a fabric destructive sucrosic dolomite texture. During telogenesis (i.e. after exhumation) influx of meteoric seawater initiated dedolomitization. In path 2, early diagenetic dolomite precipitated until late eogenesis. During burial, the late dolomitic cement underwent recrystallization induced by a mixture of trapped initial seawater and circulating meteoric water. During telogenesis and exhumation, the same process of dedolomitzation as in path 1 produced the present-day observed dedolomitized fabric with secondary moldic pores

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