Abstract
This study includes fossildiagenetical and geochemical analysis of the decapod carapaces and the host rocks, sampled at the Poty quarry, outcrop of the Maria Farinha Formation, State of Pernambuco, Brazil. In this geological setting the brachyura are envolved by biomicrites mineralogically composed by quartz, calcite, hidroxylapatite, dolomite and kaolinite. The allocheme elements in these biomicrites are represented by decapod crustaceans, benthonic and planktonic foraminifera, ostracods, microbivalves, microgastropods, calcareous algae, microbryozoans, corals, diatoms and spines of echinoids. Six presumebly simultaneous eodiagenetic processes were identified: (1) replacement of the skeletal aragonite by calcite; (2) pyritization of the organic matter; (3) phosphatization of the organic matter; (4) mechanical compactation; (5) formation of CaC03 fringe; and (6) local dissolution of CaC03 precipitated in pores. The δ13C e δ18O values suggested marine palaeoenvironment with high oxidation of the organic matter in the benthos during times of the low sea level and the continental influence.
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