Fig. 5: Igneous inflation and arc thickening during different stages of subduction. | Communications Earth & Environment

Fig. 5: Igneous inflation and arc thickening during different stages of subduction.

From: Magmatic flare-up causes crustal thickening at the transition from subduction to continental collision

Fig. 5

A Upper panel: amount of water in the different sections of subducted crust in a column of 1 m2 at sub-arc P–T conditions (see text for details). Lower panel: response of the arc to varying magma production, caused by varying H2O release of the subducting slab over time. The different colors of the boxes (dark green to light blue) indicates arc crust produced at different time intervals (time scale at the bottom). B Change in modal abundance of residual phases during burial of an upper arc metagabbro (sample TO-140 from ref. 24.). Thick yellow line: extracted melt; thick red line: density variation of the residual phases. Mineral abbreviations: amph amphibole, chl chlorite, zo zoisite, ep epidote, ttn titanite, plag plagioclase, qtz quartz, cpx clinopyroxene, phe phengite, grt garnet, rt rutile, ky kyanite, and m melt. Left panel illustrates the process of flare-up and upper arc igneous inflation with coeval burial of earlier shallower arc to eclogitic conditions. The 15 millon years span from the garnet-in isograd to eclogitic conditions is constrained by the mid-Yb and low-Yb zircon rims of sample DKE-374.

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