Fig. 3: Petrology of water-borne volcanic ash and biological features in host black shale of the Upper Triassic Chang 7 Member in the Ordos Basin. | Communications Earth & Environment

Fig. 3: Petrology of water-borne volcanic ash and biological features in host black shale of the Upper Triassic Chang 7 Member in the Ordos Basin.

From: Volcanic fertilization of Late Triassic lacustrine algal blooms

Fig. 3

a Tuffaceous sandstone with an upward-fining sequence (MQC-54). b Volcanic glasses cemented by calcite (MQC-53). c, d Charcoal within the tuffaceous sandstone (MQC-54, 7 cm). e Halophilic green algae (MQC-54, 8 cm) at the bottom of tuffaceous sandstone. f Fluorescent image of a panel (e). g, h Benthic brown algae thallus in black shale at the bottom of water-borne volcanic ash (MQC-54, 9 cm). i Biological transformation under the action of water-borne volcanic ash (MQC-54). j Vertical distribution of TOC and elemental ratios in water-borne volcanic ash (yellow shading) and host shale (MQC-54).

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