The Songling and Majiayu peridotite blocks occur in the Eastern Block, North China Craton (NCC). Geothermobarometry data show that the Songling peridotites began exhumation from a depth of c. 70 km (c. 23 kbar). During exhumation, the Songling peridotites were intruded by an upper-crust-derived, high-δ18O (up to +7.28‰ in zircon) trondhjemitic dyke at 2.47 Ga and experienced granulite-facies metamorphism. The Songling peridotites have hybrid mantle wedge (HMW) -like high SiO2 (> 45 wt%), high FeOt (c. 10 wt%) content, high modal orthopyroxene abundance (> 35%) and high ϵNd(t) (+18.4 to +21.4), which were generated by the reaction between peridotite and eclogite-derived melts. The clinopyroxenes from the Songling peridotites were in equilibrium with a Nb-, Zr- and Ti-depleted arc-like magma. The Majiayu peridotites are characterized by depletion of Nb, Zr and Hf and are highly enriched in FeOt, Th and light rare earth elements (LREEs), which can be interpreted as an open system reaction between hydrous melts and fore-arc mantle peridotites. These two peridotite blocks are considered to be arc-related mantle peridotites that experienced melt extraction and metasomatism in different styles. They were exhumed to the north margin of the North China Craton during the c. 2.47 Ga arc–continent collision along the Zunhua structural belt.

中文翻译：

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2.47 Ga前华北克拉通东陆块出土的弧相关橄榄岩块

松岭和马家峪橄榄岩地块产于华北克拉通东部地块（NCC）。地热气压数据显示，松岭橄榄岩从深C。70公里（C。23 千巴）。在折返过程中，松岭橄榄岩被上地壳衍生的高δ182.47 Ga的O（锆石中高达+7.28‰）长花岗岩脉，经历麻粒岩相变质作用。松岭橄榄岩具有混合地幔楔（HMW）类高SiO2(> 45 wt%), 高 FeOt (C。10 wt%) 含量，高模态斜方辉石丰度 (> 35%) 和高ε钕(吨)（+18.4 至 +21.4），由橄榄岩和榴辉岩衍生熔体之间的反应生成。松岭橄榄岩中的单斜辉石与贫 Nb、Zr 和 Ti 的弧状岩浆处于平衡状态。马家峪橄榄岩以贫Nb、Zr和Hf为特征，富含FeOt、Th和轻稀土元素（LREEs），可解释为含水熔体与弧前地幔橄榄岩之间的开放体系反应。这两个橄榄岩块体被认为是与弧有关的地幔橄榄岩，经历了不同样式的熔体提取和交代作用。其在华北克拉通北缘出土。C。2.47 Ga 弧陆碰撞沿遵化构造带。