Fig. 7: Back-scattered electron (BSE) images and Zr-in-rutile temperatures.
From: Changes in orogenic style and surface environment recorded in Paleoproterozoic foreland successions
a, b Inferred metamorphic in situ rutile grains aligned with the foliation of quartzite sample (20SS01) from the Songshan Group. c Separated rutile grains from the Songshan Group show euhedral, subhedral or irregular shapes. d Coloured BSE images showing well-rounded detrital rutile (and zircon) grains from quartz sandstone (20DF03) of the overlying lower Wufoshan Group, which are different from the metamorphic rutiles from the Songshan Group. e, f Histograms, kernel density estimations, and boxplots showing Zr-in-rutile temperatures (TZIR) for rutile from the Songshan Group and the lower Wufoshan Group. The dark blue cross represents the average temperature. g TZIR versus age diagram. The literature data and metamorphic facies boundaries are from ref. 62 UHT ultra-high temperature, HP high pressure.
