Laser ablation in situ U-Pb dating and its application to diagenesis-porosity evolution of carbonate reservoirs

SHEN Anjiang,HU Anping,CHENG Ting,LIANG Feng,PAN Wenqing,FENG Yuexing,ZHAO Jianxin

Fig. 4. Laser in-situ U-Pb isotopic ages of dolomite cements filling pores and fractures. (a) The age of the equiaxed granular dolomite cements filling algae mound lattice pores is 545.7±8.5 Ma; the sample number is GS6-Z2d2-1; (b) The age of the leaf-like dolomite cement filling pores is 499±25 Ma; the sample number is MX22-Z2d2-2; (c) The age of the medium-coarse crystalline dolomite cement filling pores is 468±12 Ma; the sample number is MX22-Z2d2-3; (d) The age of the dolomite cement filling fractures in micritic dolomite is 472±21 Ma; the sample number is MX22-Z2d2-4; (e) The age of the dolomite cement filling fractures in algal lamina dolomite is 41±10 Ma; the sample number is GS1-Z2d4-2; (f) The age of the coarse crystalline dolomite cement filling fractures in algal lamina dolomite is 41±35 Ma; the sample number is MX9-Z2d2-1.