Arp et al. (2003) present data which confirm and refine the results of our long-time studies (field campaigns of 1986, 1993, 1996) on Satonda Crater Lake (summarized in Kempe and Kazmierczak 1993). They reiterate the importance of marine stratified water bodies in generating, through sulfate reduction, excess alkalinity, which in turns causes very high CaCO3 supersaturation levels. This geochemical process, called the alkalinity pump (Kempe 1990), was conceptually refined using the quasi-marine Satonda Lake as a geochemical model for some epicratonic marine basins from the geological past (Kempe and Kazmierczak 1994). The concept of...

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