Evolution of Apatites in the Diagenesis

摘要: Apatites occurring in sedimentary rocks are carbonate fluorapatites (C-F apatites) with different CO2 contents. During diagenesis, the C2 C-F apatites gradually decreased increasing strength of resulting systematic changes refractive index, specific gravity, cell parameters and crystal chemistry apatites. On basis X-ray diffraction IR spectroscopic analyses, author proposes two for determining diagenetic stages, i.e., crystallinity index (CR) sharpness (SH). These serve as new criteria determination, which due to common existence phosphorous nodules bands argillo-crystalline cement rocks, most likely have wide prospects application.