Eoarchean [3.6 to 4.0 billion years ago (Ga)] tonalite-trondhjemite-granodiorite (TTG) is the major component of Earth's oldest remnant continental crust, thereby holding the key to understanding how continental crust originated and when plate tectonics started in the early Earth. TTGs are mostly generated by partial melting of hydrated mafic rocks at different depths, but whether this requires...

Mafic–ultramafics complexes are crucial for their tectonic implication, upper mantle condition, and hosting industrial minerals in a region. This study aims to highlight characterize the mafic–ultramafic rocks of Logar Ophiolite Complex using integration geospatial technology field data. The spatial distribution ophiolitic complex was examined this mineralogical indices (MI), band ratio (BR), s...

The Bound ary Pro ject has been ini ti ated with the pur pose of better char ac ter iz ing the lithological and geo chem i cal vari a tions within and be tween the var i ous Pa leo zoic se quences in the south ern Okanagan re gion along the United States bor der. These oc cur within the Quesnel Terrane, which is dom i nated by such Pa leo zoic mafic vol ca nic and pelitic rocks, un con form abl...

Early Jurassic plutonic rocks from the Central Lhasa block that range gabbro to granite yield similar 206Pb/238U ages ranging 187.6 Ma 196.0 Ma. Gabbros and diorites are characterized by radiogenic 87Sr/86Sr(t) ratios 0.7053 0.7060, unradiogenic εNd(t) values −4.2 −2.5 εHf(t) −8.8 −2.8. Compared with intermediate mafic rocks, granites have much higher ratios, 0.7102 0.7127, lower values, −8.7 −...