上地幔岩（upper mantle rock） 根据模拟上地幔岩假设的一种岩石,其成分比较接近球粒陨石的硅酸盐相或二辉橄榄岩。地幔岩可顺超壳深大断裂带进入地壳,如洋中脊的二辉橄榄岩和裂谷带的金伯利岩。高温高压实验研究表明,地幔岩在不同的深度,所分熔出来的玄武岩的成分并不相同,如拉斑玄武岩在深度大于15千米处分熔产生,高铝玄武岩在深度15~35千米处产生,而碱性橄榄玄武岩则在35~70千米处产生。
上地幔隆起区是控制砂金矿和岩金矿面式分布的主要因素。
The upheaval zone in upper mantle is the primary factor controlling the distribution of gulch-gold mines and lode gold mines.
上地幔由超镁铁质的二辉橄榄岩组成，在尖晶石二辉橄榄岩和石榴石二辉橄榄岩之间有一过渡层。
The upper mantle consists of lherzolite, and it seems that there is a transition zone between spinel and garnet lherzolites.
阳原幔源包体包括二辉橄榄岩和方辉橄榄岩，是华北西部上地幔的直接样品。
The xenoliths in the yangyuan, including iherzolite and harzburgite, represent the direct samples from the upper mantle beneath western north China craton.
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