Plume interaction and mantle heterogeneity: A geochemical perspective

• DOI: 10.1016/j.gsf.2020.02.009
• Publication Date: 2020-03-03T07:13:35Z
• Authors: Zhen Zhang; Sanzhong Li; Guangzeng Wang; Xiyao Li; Gang Wang; Yanhui Suo; M. Santosh; Lingli Guo
• Keywords: Mantle plume; Silicate perovskite; Hotspot (geology)

Mantle plumes originating from the Core-Mantle Boundary (CMB) or Transition Zone (MTZ) play an important role in material transfer through Earth's interior. The hotspot-related originate different mechanisms and have diverse processes of transfer. Both Morganian large low shear wave velocity provinces (LLSVPs) are derived D″ layer CMB, whereas Andersonian upper mantle. All a plume head at Moho, although LLSVPs additional MTZ. We compare geochemical characteristics various attempt to evaluate exchange between mantle layers. layer, consisted subducted slab post-perovskite lower Bridgmanite would crystallize during upwelling process mantle, residual is basalt-trachyte suite. Unlike plumes, crystallization insufficient that accumulates beneath MTZ form head. Typically, secondary above occur edge because it easier for bridgmanite crystal separating edge, with density upwells plumes. Meanwhile, Na K enriched long-term process, then basalt-phonolite suite appears LLSVPs. suggest basalt-rhyolite major component Meanwhile also assimilation contamination Moho.