Figure 4 | Scientific Reports

Figure 4

From: Fluid evolution and related fluid–rock interactions of the Oligocene Zhuhai sandstones in the Baiyun Sag, northern margin of the South China Sea

Figure 4

Photomicrographs of feldspar dissolution and associated authigenic minerals in the Zhuhai sandstones. (a) LW1-1, 1707.5 m: dissolution of feldspar along the cleavages; (b) LW4-1, 1519.8 m: leached feldspar with the precipitation of secondary kaolinite and associated secondary minerals; (c) LW1-2, 2429.5 m: feldspar-dissolution mouldic pores and kaolinite precipitation; (d) LW1-1, 1707.5 m: SEM micrograph showing leached feldspar along the cleavages; (e) LW3-1, 1861.5 m: SEM micrograph showing a feldspar-dissolution pore filled by clay precipitation; (f) LW1-2, 2509.5 m: precipitation of albite on leached feldspar. Note: Q = quartz, FD = feldspar dissolution, PP = primary pore, IS = illite and smectite mixed layers, K = kaolinite, and Al = albite.

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