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Journal of Palaeogeography
Fig. 6 | Journal of Palaeogeography

Fig. 6

From: Continental chemical weathering during the Early Cretaceous Oceanic Anoxic Event (OAE1b): a case study from the Fuxin fluvio-lacustrine basin, Liaoning Province, NE China

Fig. 6

A-CN-K ternary diagrams (Fedo et al., 1995) for mudstones from the Shahai and Fuxin formations, Fuxin Basin, Liaoning Province, northeastern China. Red circle - borehole DY-1; Blue circle - borehole FY-1. The CIA scales are shown at the left side of each diagram for comparison. Ideal weathering trends are given by solid lines ⓐ and ⓑ, where solid line ⓐ is parallel to the A-CN; Solid line ⓒ is the K-metasomatism trend that resulted from the diagenetic K addition to the samples. Dotted line ⓓ is the reverse extension line of solid line ⓐ. Solid line ⓔ shows premetasomatized CIA value. Dotted line ⓕ represents CIA value after K-metasomatism. Ideal compositions of minerals labelled: Pl, plagioclase; Ks, K-feldspar; Il, illite; Sm, smectite; Ka, kaolinite; Gi, gibbsite; Ch, chlorite

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