Extended Data Fig. 3: Geochemical correlation of cryptotephra DCH-67.55 to the 73.7-kyr YTT25 based on major, minor and trace-element glass shard composition.
From: Reversed Holocene temperature–moisture relationship in the Horn of Africa
a, TAS plot76 comparing major element composition of DCH-67.55 to published compositions of YTT112,113,114 and of evolved (phonolitic, trachytic and rhyolitic) volcanic products from Middle to Late Pleistocene eruptions of Central Kenyan Rift115,116,117,118,119,120,121,122,123, Northern Tanzanian Off-Rift52 and Main Ethiopian Rift124 volcanoes. Reference compositional data represent tephra glass shards (G) where available, supplemented by obsidian (obs) and whole rock (WR) samples where data are limited. DCH67.55 is discriminated from all eastern African tephra sources in the TAS plot except for Ethiopian rhyolites, which can be separated from YTT using FeO and Al2O3 compositions (b). Comparative Y and Ba compositions (c) confirm agreement of DCH-67.55 to YTT sub-populations I-IV, as recognized in YTT samples from Malaysia and the Indian Peninsula125.
