Fig. 7
From: Development of a quartz-based geothermometer for biogenic chert
(a) Relationship between the quartz crystallinity index (CI) of chert vs. paleotemperature of mudstone present nearby the chert outcrops. Error bars for quartz crystallinity and paleotemperature denote ± 0.45 and ± 30 °C respectively. (b) Relationship between the quartz grain size (GS) of chert vs. paleotemperature of mudstone present nearby the chert outcrops. Error bars for GS and paleotemperature denote ± 10% of the data and ± 30 °C respectively. CI: quartz crystallinity index, GS: quartz grain size.
