Evolution of Apatites in the Diagenesis

作     者：Liu Kuiwu Institute of Geology, Academia Sinica, Beijing Liu Linqun 

作者机构：Chinese Academy of Geological Sciences Beijing 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：1990年第64卷第2期

页      面：147-162,233+236页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0816[工学-测绘科学与技术] 

主　　题：Evolution of Apatites in the Diagenesis 

摘      要：Apatites occurring in sedimentary rocks are carbonate fluorapatites (C-F apatites) with different CO_2 contents. During diagenesis. the CO_2 in the C-F apatites gradually decreased with the increasing strength of diagenesis. resulting in the systematic changes in refractive index. specific gravity, cell parameters and crystal chemistry of apatites. On the basis of X-ray diffraction and IR spectroscopic analyses, the author proposes two parameters for determining diagenetic stages. i.e.. the crystallinity index (CR) and sharpness index (SH). These two parameters serve as new criteria for the determination. which due to the common existence of phosphorous nodules and bands and argillo-crystalline cement in sedimentary rocks, most likely have wide prospects for ap- plication.