Mantle-derived magmatism provides important insights for understanding the mechanism of lithospheric thinning. Here we report results an integrated geochronological and geochemical study Late Triassic mafic dykes in Eastern Hebei, northern North China Craton. In situ zircon U-Pb dating shows that were emplaced between 238 223 Ma; coeval Gaojiadian Mataizi intruded Precambrian basement at 238–23...

A mafic dyke is a mass of rock generated in either sedimentary or igneous terrain and intrudes pre-existing cracks. It was common to see many enormous swarms the southern granulitic landscape made up archean rocks. Dykes tend be younger than surrounding body. Generally, dolerite has an ophitic texture medium fine grained. In study area country rocks petrographical microscope, XRD, FE-SEM techni...

Microdiamonds from the Akluilâk minette dykes (Nunavut, Canada) are similar to diamonds formed in subducted metamorphic rocks. High concentrations of unaggregated nitrogen and positive delta(15)N suggest that the microdiamonds formed within rocks subducted to ultrahigh pressures before being sampled by the minette magma 1.8 billion years ago. This ultrahigh pressure metamorphism in North Americ...

The Kermanshah ophiolite complex is a part of the Mediterranean–Zagros–Oman Tethyan ophiolites, located in the structural–tectonic zone of western Iran in the northern part of the Zagros main thrust. Doleritic sheeted dykes are well exposed within the ophiolite in the south of Sahneh. These dykes contain high MgO, Na2O, low TiO2 (2O5, and K2O contents, and high FeOt/MgO and LILE/HFSE ratios. Th...