Alternatively,here we propose a kinetic model to clarify its origin.Geodynamic models show thatmagma replenishment on a decadal timescale is required to prevent a magma chamber freezing in mid-oceanridge(Liu and Lowell,2009;Moore et al.,2014;Morgan and Chen,1993).This suggests that early injectedprimitive magma had undergone a rapid cooling and reheating process.During the rapid cooling stage,theboundary layer of rapid-growing olivine(growth by diffusion),will enrich in Al2O3due to its lowerdiffusivity in silicate melt and its incompatibility in olivine(Newcombe et al.,2014;Zhang et al.,2010),thusplagioclases can be oversaturated within the boundary layer.At the reheating stage,the crystallizedplagioclase will redissolve due to the relaxation of Al2O3,while the olivine grows continually at relativelyslow rate(growth by interface attachment).Since Sr is compatible in plagioclase(Blundy and Wood,1991),dissolving of plagioclase cause the melt inclusion formed at this stage has the positive Sr anomaly.BecauseSr has higher diffusivity than many other trace elements(Behrens and Hahn,2009),thus longer boundarylayer thickness of Sr is expected,therefore melt inclusion can be formed with only‘ghost plagioclase’signature without other trace element anomalies.Our modeling results verify this.Clinopyroxene can be alsosaturated within the boundary layer of a rapid growing olivine.Our modeling successfully show that thediffusive dissolution of the clinopyroxene leads to the‘depleted’melt inclusions,found in oceanic islandbasalts(Sobolev et al.,2000).