Examination of an extensive adakite geochemical database identifies two distinct
compositional groups. One consists of high-SiO2 adakites (HSA) which is considered to …

▪ Abstract The Re-Os isotope sytem, based on the long-lived β− transition of 187Re to
187Os, has matured to wide use in cosmochemistry and high-temperature geochemistry …

The covariant behavior of Lu-Hf and Sm-Nd isotopes during most magmatic processes has
long been recognized, but the details of this behavior in the depleted mantle reservoir have …

Based on a compilation of published sources, rocks referred to as adakites show the
following geochemical and isotopic characteristics: SiO2≥ 56 wt percent, Al2O3≥ 15 wt …

Potential applications of the Lu-Hf isotope system have long been impeded by the analytical
difficulties of obtaining data on a wide variety of geological materials. Many of these …

There is no consensus on the processes responsible for near-coeval formation of Archaean
continental crust (dominantly tonalite–trondhjemite–granodiorite: TTG), greenstone belts …

The continental crust has an andesitic composition with high Mg/(Mg+ Fe) and Ni contents
which may be too high to have formed by differentiation of basaltic magmas. Instead, mantle …

Due to the large partition coefficients of garnet for Lu compared to Sm, Nd, and Hf, garnet
residual from crustal melting events has a large potential for retaining Lu and, over time …

Publisher Summary The solar system formed in an already old Universe, which was about
10 Ga after the Big Bang. The earth accreted from dust and gas in the inner part of the solar …

Birimian terranes from West Africa (Mauritania, Senegal, Ivory Coast, Burkina Faso, Niger)
comprise two major units: a dominantly mafic bimodal volcanic unit and a volcano‐detrital …