Extended Data Fig. 2: Representative field observations and rock textures of the Paleoarchean Barberton TTG plutons and Buck Ridge Volcanic Complex (BRVC).
From: Earth’s earliest granitoids are crystal-rich magma reservoirs tapped by silicic eruptions
a, typical texture of undeformed, plagioclase (pl)-phyric trondhjemite (Theespruit). b, trondhjemite (Td) cross-cut by dykes of hololeucocratic, aplitic granite (G) and containing small xenoltihs of amphibolite (A) (Theespruit). c, Igneous-textured, mesocratic and undeformed tonalite (To) showing irregular and gradational contact with leucocratic trondhjemite (Td), both cross-cut by a granite (G) dyke (Stolzburg). d, Undeformed, coarse-grained granite (G) showing irregular layering defined by the accumulation of biotite (bt) (Doorhoek). e, undeformed, garnet (grt)-bearing, aplitic granite (Theespruit). f, Igneous-textured, undeformed diorite (Theespruit). g, Igneous-textured diorite (Dio) mingled with leucocratic trondhjemite/granite (Td/G) (Theespruit). h, trondhjemite (Td) containing an angular, sharp-edged xenolith of amphibolite (A) (‘gneissic zone’). i, Angular blocks of amphibolite (A) brecciated by the intrusion of trondhjemite (Td) (Theespruit). j, Internally foliated, sharp-edged xenolith of amphibolite (A) in igneous-textured trondhjemite (Td) (Theespruit). k, Microphotograph showing the texture of a felsic volcanic rock from the BRVC, containing quartz (qz) and altered plagioclase (pl) phenocrysts in a devitrified groundmass (gm). l, Microphotograph showing the seriate texture of a felsic sub-volcanic rock from the BRVC, with phenocrysts of quartz (qz), altered plagioclase (pl) and biotite (bt).
