Carbonate cycles Archaean

Schidlowski M., Appel P. W. U., Eichmann R., and Junge C. E. (1979) Carbon isotope geochemistry of the 3.7 X 10 yr-old Isua sediments, West Greenland implications for the Archaean carbon and oxygen cycles. Geochim. Cosmochim. Acta 43, 189-199. 

Archaean weathering profiles. Further evidence for a C02-rich Archaean atmosphere comes from indications of an aggressive weathering regime in the late Archaean sedimentary record, driven by a high content of carbonic acid in the weathering environment. Two different arguments are used to support this claim. First, first-cycle sediments are much more refractory than their modern... 

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