Xenoliths play a crucial role in interpretation of mantle deformation and geochemistry. The classic work Mercier Nicolas (1975) introduced the concept peridotite cycle, which connected observed microstructures to physical sequence deformation. We revisit Nicolas' original concept, bringing new constraints using large area EBSD maps associated microstructural datasets, analysis water contents no...

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...

Robat-e Zengejeh rocks affected by a variety of events began from Precambrian. This research studied preserved effects of the events. Regional metamorphism is the oldest event in this rocks include schist, amphibolite and orthogneiss, that reached up to amphibolite facies. After this regional metamorphism, it seems that mesocratic (624±5Ma) and hololeucocratic granitoides intruded respectively....

Abstract In Pagondas and Kimi areas, central Evia Island, Greece, variably serpentinized ultramafic rocks of an ophiolitic origin are crosscut by rodingite dikes. Based on their protoliths, these rodingites distinguished into the following: (i) island arc tholeiitic dolerites, (ii) Mg-rich gabbros, (iii) alkaline basalts, (iv) calc-alkaline basalts. Rodingitization evolved in three successive p...

Abstract A plausible origin of the seismically observed mid-lithospheric discontinuity (MLD) in subcontinental lithosphere is mantle metasomatism. The metasomatized likely to stabilize hydrous phases such as amphiboles. existing electrical conductivity data on amphiboles vary significantly. hornblendite much higher than that tremolite. Thus, if truly represents amphibole varieties MLD regions, ...

The structure and lithological sequences of ophiolites provide critical information for reconstructing their tectonic setting thus, the history paleo-oceanic basins in which they formed. Our systematic mapping three best-preserved massifs Xigaze ophiolite from middle segment Yarlung Zangbo Suture Zone (YZSZ) South Tibet, revealed a nearly intact ophiolitic sequence that has largely escaped empl...