Abstract Petit-spot volcanoes provide a unique opportunity to directly examine the structure and geochemical composition of lithospheric asthenospheric mantle beneath subducting oceanic crust. Currently, petit-spot volcanos—formed in response flexure plates—are known exist off Japan, Java, Chile Mariana trenches, however, difficulties associated with detecting them leaves possibility that they ...

The Kaimuqi area in the Eastern Kunlun Orogen (EKO) contains many lherzolite, olivine websterite, gabbro and diorite intrusions, new zircon U–Pb dating, Lu–Hf isotope whole-rock geochemical data are presented herein to further confirm Late Triassic mafic–ultramafic magmatism with Cu–Ni mineralization discuss petrogenesis geodynamic setting. Zircon dating shows that ages, corresponding 220 Ma 22...

Martian meteorites are the only available samples that can be directly measured to constrain geological evolution of Mars. It has been suggested oxygen fugacity (fO2) martian shergottite meteorites, which have low (∼7 wt.%) high-MgO (∼30 compositions, correlates with incompatible trace element enrichment (i.e., La/Yb), and 87Sr/86Sr, 143Nd/144Nd, 187Os/188Os 176Hf/177Hf at time crystallization....

The Sanchahe iron-gold deposit in western Shandong province is located the southeast of North China Craton. skarn type (without copper) contact belt between pyroxene diorites and Ordovician limestone xenoliths. zircon U-Pb age 138.4 ± 1.2 Ma belonging to Early Cretaceous. Pyroxene (Rittmann index ? = 2.2~2.5) belong calc-alkaline series SiO2 content 55~59%. Furthermore, are characterized by hig...

Abstract Generally all orogenic ultrapotassic rocks are formed after melting of metasomatized sub-continental lithospheric mantle via subducted crustal mica-bearing lithologies. Here we present another possible model, based on the study small Stomanovo monzonite porphyry intrusion in Central Rhodope Massif, Bulgaria. The dated at 30.50 ± 0.46 Ma is intruded into voluminous Oligocene (31.63 0.40...

The Lubei Ni–Cu–Co deposit situated in western segment of the Huangshan-Jing’erquan mafic–ultramafic rock belt eastern Tianshan Central Asian Orogenic Belt (CAOB). estimated reserve is approximately 9.11 million tons ore resources with average grades 0.82 wt% Ni, 0.52 Cu, and 0.03 Co. intrusion mainly composed gabbro (phase I), peridotite II), pyroxene III), olivine pyroxenite IV), diorite V), ...

Abstract We present new bulk-rock 40Ar/39Ar age, major and trace elements Sr-Nd-Hf isotopic data on the early Cretaceous intra-plate alkali basalts from Western North China Craton (WNCC) to study origin of metasomatized cratonic lithosphere mantle. The age these is ~116 Ma. These have elevated incompatible element abundance with high [La/Sm]N (2.80–4.56) enriched compositions (87Sr/86Sri = 0.70...