Minerals Filling in Anhydrite Dissolution Pores and Their Origins in the Ordovician Majiagou Formation of the Southeastern Ordos Basin, China

Figure 7

Characteristics of fluid inclusions in minerals filling in anhydrite dissolution pores in Yican 1. (a) Two-phase liquid-vaporous inclusions (WL+V) in calcite filling in anhydrite dissolution pores corresponding to Figures 4(j) and 4(k), 2640.9 m, Ma₅¹, sample 90. (b) Two-phase liquid-vaporous inclusions (WL+V) in calcite filling in anhydrite dissolution pores corresponding to Figure 4(i), 2642.5 m, sample 96. (c) Two-phase liquid-vaporous inclusions (WL+V) in calcite filling in anhydrite dissolution pores, 2641.8 m, sample 94. (d) Two-phase hydrocarbon inclusions of calcite filled in fracture showing light brown (OL) and black color (OV) in transmission light, 2642.5 m, sample 96. (e, f) Vaporous hydrocarbon inclusions (OV) of calcite showing black color in transmission light, 2635 m, sample 73. (g) Two-phase hydrocarbon inclusions of calcite filled in fracture showing light yellow (OV) and no fluorescence light (OV) in ultraviolet fluorescence light (the same thin section of (d)), 2642.5 m, sample 96. (h) Liquid hydrocarbon (OL) in the dolomite at the bottom of mold showing light green color in ultraviolet fluorescence light, 2641.8 m, sample 94. (i) Vaporous hydrocarbon inclusions (OV) of calcite showing yellow color in ultraviolet fluorescence light (the same thin section of (f)), 2635 m.

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