Fig. 6 | Scientific Reports

Fig. 6

From: Oxygen-depleted and ferruginous seawater composition imprinted in Early Cretaceous Fe-rich Al-glauconites in marginal marine deposits

Fig. 6

X-ray diffractogram of the clay-separated samples of Pariwar Formation (a) and Habur Formation (b). Note: Qz-Quartz, Fsp-Feldspar, Glt-Glauconite, Gth-Goethite, Hem-Hematite, Kln-Kaolinite, Mnt-Montmorillonite. Bivariant plot of glauconites: Fe2O3 vs. K2O cross-plot (c), Fe2O3 vs. Al2O3 cross-plot (d). The Al-glauconite has been defined based on published data18. The Al-rich glauconites from Precambrian, Paleozoic successions2,16,18,89,90 and Cretaceous deposits form the cluster at the upper left corner91. Paleogene shallow marine glauconite forms a separate cluster11. Fe-rich Al-glauconite is demarcated for the first time.

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