Fig. 5: Relationships between calculated temperatures,lithospheric thickness variation, and dynamic topography.
From: Global influence of mantle temperature and plate thickness on intraplate volcanism
a Diagram showing relationship between ΔTp determined by geochemical inverse modeling and that determined by calibration of SL2013sv tomographic model where ambient mantle temperatures are assumed to be 1312 °C and 1333 °C, respectively. Open circles with vertical and horizontal error bars = calculated values of temperature for global distribution of intraplate volcanism ± 1.5× minimum misfit; black line 1:1 relationship; R = correlation coefficient; P = population correlation coefficient; R = 0.28 is minimum value of R distinguishable from zero at significance level of = 0.001. b Map showing spatial variation of average value of ΔTp at depths of 150 ± 25 km calculated from SL2013sv tomographic model. Red/white/blue contours = positive/zero/negative values of ΔTp at intervals of 50 °C; colored circles = geochemical values of ΔTp; yellow line between x and \(x^{\prime}\) = locus of transects shown in panels c–f. c Transect from x to \(x^{\prime}\) that intersects Iceland (IC), North Sea (NS), Eifel (EF), Anatolia (AN), Central Arabia (CA), Afar (AF) and Tanzania (TZ). Black line with gray polygon = topographic profile; dashed line = reference sea level; blue polygons = loci of uplifted Cenozoic marine strata58,59. d Red line = average values of ΔVs at depths of 150 ± 25 km along transect calculated from SL2013sv tomographic model; open circles = observed values of La/Sm averaged into 1° bins that lie within <200 km of transect; red circles = bins with > 5 values of La/Sm. e Colored ribbon = average values of ΔTp at depths of 150 ± 25 km calculated from SL2013sv tomographic model where color scale is shown at right-hand side of panel b; colored circles with vertical bars = values of ΔTp calculated for screened and binned version of Database 1 ± 1.5× minimum misfit. Dashed black line at ΔTp = 0 is for visual guidance. f Black line = lithospheric thickness variation along transect calculated from SL2013sv tomographic model; circles with vertical bars = estimates of lithospheric thickness determined by geochemical modeling ± 1.5× minimum misfit; blue squares = present-day lithospheric thickness estimated from elevation of marine rocks by assuming combination of lithospheric mantle thinning, where original thickness is 120–150 km, and sub-plate thermal anomaly with thickness of 100 km whose magnitude is taken from panel e.
