The Bou Azzer district in Morocco has a long mining history since the beginning of XXst century during which it become only world producer Co from primary, hydrothermal arsenide ores. Orebodies are structurally controlled, and mainly distributed along fault contacts between Cryogenian ophiolite-related serpentinite bodies intrusive quartz diorite or, locally, ophiolitic gabbros or Ediacaran vol...

The activity of the Damavand volcano (Central Alborz, northern Iran) began 1.8 Ma ago and continued up to 7 ka BP. Although the volcanic suite is clearly of shoshonitic affinity, only two petrographic types can be distinguished in the studied lavas: (1) weakly differentiated absarokites (49 < %SiO2 < 51), scattered around the volcano but with a regional extension, (2) highly differentiated bana...

Abstract To constrain the closure mechanism and time of Paleo-Asian Ocean, we report new geochronological geochemical data for Triassic granites along a NW–SE corridor from Eastern Tianshan to Beishan, NW China. Seven have U-Pb ages that young southwards 245 Ma 234 in Kanguer accretionary complex, 237 eastern Central block, 229 223 Liuyuan complex. Granites complex formed by fractional crystall...

The geology and magmatism of the northern Mariana Trough (NMT) represent a type example for development back-arc basin (BAB). It is mature spreading center in south propagating northward via rifting arc rear lithosphere response to trench retreat overriding plate extension space time. thus essential fully characterize its tectonomagmatic processes that are potentially global significance. For t...

Introduction: Many lunar samples record some degree of disturbance to their U-Pb isotopic systematics [e.g., 1,2]. This disturbance may be reflected in Pb-Pb, U-Pb, U-Pb, or concordia ages that are discordant among the U-Pb systems as well as with more robust Sm-Nd and Rb-Sr ages. Both mare basalt 10017 and norite 78238 fail to yield consistent geochronologic results among their Pb-Pb, U-Pb, an...

The observation of superconductivity in infinite layer nickelate (Nd,Sr)NiO$_{2}$ thin films has led to rapid theoretical and experimental investigations these copper-oxide-analogue systems [1-15]. Superconductivity also been found (Pr,Sr)NiO$_{2}$ [16,17], but not previously (La,Sr)NiO$_{2}$ [2], raising a fundamental question whether is associated with the presence rare-earth moments [18,19]....

The results of our combined U–Pb, Rb–Sr, and Sm–Nd isotope study of mare basalt 10017 contribute to the understanding of the petrogenetic processes involved in the origin of geochemical diversity in lunar mare basalt sources, as well as the U–Pb isotope systematics of the Moon. The Rb–Sr, Sm–Nd, and U–Pb isotope systems yield concordant crystallization ages of 3.633 ± 0.057 Ga, 3.678 ± 0.069 Ga...