Due to the steeper adiabatic gradient of plumes compared with ambient mantle, plume heat flux and plume excess temperature decrease approximately by a factor of two during plumes' ascent. In order to reproduce surface plume-related observations, ∼70% internal heating ratio of the Earth's mantle...
Earth - Core, Mantle, Crust: More than 90 percent of Earth’s mass is composed of iron, oxygen, silicon, and magnesium, elements that can form the crystalline minerals known as silicates. Nevertheless, in chemical and mineralogical composition, as in phy
and hot spots originating from the transition zone or from the core–mantle boundary (CMB) of the Earth. An important requirement for diapiric motion is stress-induced melting and dissolution–precipitation of fusible components at the front and rear of the plume, respectively. Carbonated or...
and Zeng G.(2017), The role of melt-rock interaction in the formation ofQuaternary high-MgO potassic basalt from the Greater Khingan Range, NortheastChina. J. Geophys. Res. Solid Earth, 122, doi: 10.1002/2016JB013605.
大洋板块俯冲可将洋壳和沉积物运输至深部地幔,从而造就洋岛玄武岩的地幔源区(地幔柱)的化学和岩性不均一。其中化学不均一常用几个放射成因同位素组成差异明显的地幔组分来描述:DM(亏损地幔)、HIMU(高U/Pb比地幔)、EM1(Ⅰ型富集地幔)、EM2(Ⅱ型富集地幔)和FOZO。越来越多的研究表明两个或多个上述地幔组分常常存在...
Mantle plumes are responsible for the Earth’s largest volcanic provinces. In the prevailing paradigm, the deep mantle is less degassed than convecting shallow mantle, implying that plume-derived lavas have higher concentrations of primordial volatiles s
1). Subduction of such shallow, surface and near-surface processed materials into the deep mantle over Earth's history would explain the mantle compositional heterogeneity. It follows that mantle compositional heterogeneity is a consequence of plate tectonics (see Niu and O'Hara, 2003, Niu, 2009)...
Mantle convection drives plate tectonics, redistributes heat, cycles chemical species, and generates dynamic topography at the Earth’s surface. Constraining spatio-temporal changes in the thermochemical structure of the mantle will help to refine our understanding of these interlinked phenomena. This signi...
Earth and Planetary Science Letters, 302: 359-368. Download 2、Zeng G., Chen L. H.*, Xu X. S. et al. 2010. Carbonated mantle sources for Cenozoic intra-plate alkaline basalts in Shandong, North China. Chemical Geology, 273: 35-45. Download 1、Chen L. H.*, Zeng G., Jiang S. ...
Mantle plumes provide valuable information about whole-mantle convection: they originate at the core-mantle boundary, cross Earth's mantle and interact with the lithosphere. For instance, it has been proposed that the mobility/stability of plumes depends on plume intrinsic properties, on how slabs ...