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Journal of Palaeogeography
Fig. 8 | Journal of Palaeogeography

Fig. 8

From: Characteristics and origin of a new type of polyhalite potassium ore in the Lower Triassic Jialingjiang Formation, Puguang area, northeastern Sichuan Basin, SW China

Fig. 8

Micrographic characteristics of the polyhalite aggregates. H = Halite; Pol = Polyhalite. a Subhedral granular texture of polyhalite. Sample from Well ZK001 at 3086.8 m depth, SEM. b Polyhalite with different crystal sizes. Sample from Well ZK001 at 3089 m depth, SEM. c Mosaic polyhalite structure. Sample from Well HC3 at 3444 m depth, XPL. d Oriented polyhalite crystals showing mylonite characteristics. Sample from Well HC3 at 3439 m depth, XPL. e Polyhalite crystals with no clear boundaries and no obvious direction. Sample from Well HC3 at 3441.5 m depth, XPL. f Fine-grained polyhalite showing two different bending directions, indicating two deformation stages. Sample from Well HC3 at 3444 m depth, XPL

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