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Journal of Palaeogeography
Fig. 10 | Journal of Palaeogeography

Fig. 10

From: Sedimentary characteristics of microbialites influenced by volcanic eruption: a case study from the Lower Cretaceous Shipu Group in Zhejiang Province, East China

Fig. 10

a Field photo showing the reef (outlined) and the overlying and underlying strata in the upper part of assemblage 8 (yellow rectangle in Fig. 4). Below the reef, a grain shoal develop above tuffite. Laminated fine tuffite covers, and prohibits the growth of the reef. Tuffite with coarse fabrics fills the interreef spaces; b Meso-photo of the grain shoal. Samples are respectively from the upper (c–f) and lower part (g) of the grain shoal; c Oolitic limestone. 5×, plane-polarized light; d Dolomitic limestone. Dolomite (D) is unstained. 5×, plane-polarized light; e Bioclastic limestone. A gastropod (G) can be seen clearly. 10×, plane-polarized light; f Sparry oolitic limestone with intraclasts (IC) and bioclasts (BC). 1.25×, plane-polarized light; g Photomicrograph of tuffaceous limestone; some grains are silicate (darker color) not carbonate. Stained thin section, 5×, plane-polarized light; h Photomicrograph of limy tuffite. 5×, plane-polarized light

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