Finally, assembly of cratonic nuclei into cratons at convergent boundaries substantially modified harzburgite residues by melt-rock reaction.Claude HerzbergRoberta RudnickLithos: An International Journal of Mineralogy, Petrology, and GeochemistryHerzberg, C., Rudnick, R., 2012. Formation of cratonic ...
Metamorphic diamonds hosted by major and accessory phases in ultrahigh-pressure (UHP) metamorphic terranes represent important indicators of deep subduction and exhumation of continental crust at convergent plate boundaries. However, their nucleation and growth mechanisms are not well understood due to thei...
The correlation between magmas at convergent margins and the occurrence of Cu-Au mineralization has been recognized for some time [48,61,62,63], but the nature of this connection remains a subject of controversy—is it synsubduction to postsubduction magmatism? Further to this debate on the met...
Lava cave, cave or cavity formed as a result of surface solidification of a lava flow during the last stages of its activity. A frozen crust may form over still mobile and actively flowing liquid rock as a result of surface cooling. A dwindling supply of
have low Nb/Y ratios (≤1.0) and variable Ba concentrations (10–1000 ppm) close to that of ocean island basalts (OIBs) or mid-ocean ridge basalts (MORBs), implying derivation from a mantle plume source and/ or interaction with lithospheric material during the generation of these magmas...
These settings include active divergent (oceanic spreading ridges) and convergent margins, with convergent margins characterized by subduction-related (arc and associated back arc basins) environments along oceanic and continental plate boundaries. Although a few Greater Antilles VMS deposits have been ...
The trench- side magmas may be segregated from the upper mantle at shallower levels by larger degrees of partial melting backarc-side volcanic chain. If this is the case also in Kamchatka magmatism, then the difference in depth of magma separation should become greater than that estimated from ...
The accurate detection of degassing volcanic plumes is a challenging process through field measurement because these diluted plume feature no distinctive boundaries to catch easily. However, it is completely traceable through simulations because of the significantly higher SO2 and H2SO4 concentrations in ...
Oceanic crust, the outermost layer of Earth’s lithosphere that is found under the oceans and formed at spreading centres on oceanic ridges, which occur at divergent plate boundaries. Oceanic crust is about 6 km (4 miles) thick. It is composed of several
Arc magmatism along convergent plate boundaries has been a major contributor to continental crustal growth.During the late Paleoproterozoic-Mesoproterozoic assembly of the supercontinent Nuna,following arc-backarc-continent collisions,the Makkovik Orogen,along the southern margin of the Archean North Atlantic...