The moderately siderophile and volatile elements are strong tracers of early solar nebula processes, including condensation and accretion-collision of meteorite parent bodies. Among them, the germanium (T50% condensation=825K) shows significant isotopic fractionation between metal and silicate phases in undifferentiated chondrites and in differentiated planetesimal reservoirs (i.e. mantle–core) [1,2]. Additionally, germanium isotopic data (δ74/70Ge‰) correlate with oxygen anomalies (Δ17O) in ordinary chondrites , demonstrating its capacity to trace oxidizing processes during accretion as well as genetic links between parent bodies. Here we present new high precision δ74/70Ge data obtained on bulk carbonaceous (CC) and ordinary (OC) chondrites, and an enhanced version of the δ74/70Ge–Δ17O correlation to assess NC-CC dichotomy.
Bulk CC have positive δ74/70Ge values, showing exceptional large variations of ≈1‰, from CI (Orgueil) with the heaviest composition (δ74/70Ge=+0.901±0.060‰) toward lighter composition in CV (Allende) (δ74/70Ge=+0.096±0.120‰), whereas bulk ordinary chondrites display negative δ74/70Ge . The δ74/70Ge values and matrix fraction (%) of OCs and CCs are positively correlated and describe a mixing line between CI composition and a [Ge]-depleted–δ74/70Ge-light component. In addition, OC and CC type chondrites present fundamental stable δ74/70Ge dichotomy that follow O, Ti, and Cr isotopic anomalies . Within CC, the mass dependent δ74/70Ge compositions are exceptionally well correlated with D17O, e54Ti, and e54Cr, questioning the origin and processes that lead to isotopic signature dichotomy between the inner and outer the Solar System.
 Florin G. et al. (2020) GCA 269:270-291.  Luais B. (2007) EPSL 262:21-36.  Warren P. (2011) EPSL 311:93-100.