Abstract
Calcium carbonate-cemented beach sands or «beach rocks» have been observed to occur in the intertidal zone of many tropical beaches. Near Salvador (Brasil) occurences are found in several locations on the island of Itaparica. A study of the stable isotope composition (C 13 /C 12 and O 18 /O 16 ) of the cement and the local groundwater was carried out to determine the origin of the carbonate cement. For area A, the cement has §13C= -9% showing that C02 in groundwater charged by decay of organic material is the source of carbonate in the cement. Probably cementation occurs during loss ofexcess C02 from groundwater as comes into an environment where loss of C02 is possible. In area B, where the cements contain, on the average §18 0 = 1,3%, the cement is formed from carbonate typical of sea water or a mixture of sea water and fresh water.
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