Figure 5.

Microscopic pore characteristics in Long 1₁ authigenic quartz–organic lamina, felsic–carbonate lamina, terrigenous clastic lamina, clay mineral lamina, and pyrite lamina in Zigong Block. (a) Felsic–carbonate lamina. (b) Intercrystalline, intergranular, and dissolved pores developed in felsic–carbonate lamina. (c) In felsic–carbonate lamina, quartz, feldspar, calcite, and dolomite are distributed alternatively with clay mineral as intergranular filling. (d) Carbonate lamina and authigenic–organic lamina are filled with micritic quartz. (e) In felsic–carbonate lamina, carbonate mineral alternates with micritic quartz. (f) In carbonate lamina, mineral dissolved pores and organic pores are developed. (g) Terrigenous quartz lamina and clay mineral lamina. (h) In terrigenous clastic lamina, intergranular pores are developed in clastic quartz and clay mineral. (i) In clay mineral lamina, intercrystalline pores and organic pores are developed. (j) Pyrite lamina. (k) Pyrite lamina is dominated by the automorphic crystal, filling clay mineral particle pores. (l) Intercrystalline pores are developed in the crystal.