The zircon-bearing Liushuzhuang Peridotite in the Tongbai Orogen provides insights into the composition and evolution of Paleozoic sub-arc lithospheric mantle between the North China and Yangtze cratons. This orogenic peridotite is dominated by clinopyroxene-free spinel facies harzburgite to dunite. The refractory nature is indicated by high olivine Mg# (up to 92.4), elevated spinel Cr# (74–87), and low orthopyroxene Al₂O₃ (mostly < 1.0 wt.%). The occurrence of zircon, amphibole, phlogopite, apatite, and LREE-enriched orthopyroxene, with Raman probe analyses showing amphibole and phlogopite inclusions in zircon, testifies to extensive fluid-driven metasomatism of the mantle at ca. 420 Ma (U–Pb zircon). The high spinel TiO₂ contents (0.4–1.4 wt.%), the Cl-enriched apatite, and the hydrous secondary phases indicate that the metasomatic agent was volatile- (CO₂ + H₂O) and TiO₂-rich. The elevated oxygen fugacity (∆logfO₂ (FMQ) > 2.5) coupled with high spinel Cr# of peridotites suggest that they formed within highly oxidizing supra-subduction zone environment. In-situ ⁸⁷Sr/⁸⁶Sr_i amphibole and apatite data indicate that the metasomatic fluids were slightly to moderately radiogenic (0.7032–0.7090) and therefore likely partially derived from the subducted Shangdan oceanic crust that separated the North China and Yangtze cratons. The very low ¹⁷⁶Lu/¹⁷⁷Hf (mostly < 0.0002) of metasomatic zircon and similar ε_Hf(t) to Tongbai Orogen arc-related magmas implies that zircon grew during modification of sub-arc mantle. Juxtaposition with the host gneisses occurred after 410 Ma and before U–Pb closure during apatite cooling at ~ 340 Ma. The Liushuzhuang Peridotite therefore records intense metasomatism of the Paleozoic sub-arc mantle wedge prior to collision of the North China and Yangtze cratons.

桐柏造山带含锆石的六树庄橄榄岩为了解华北和扬子克拉通之间古生代亚弧岩石圈地幔的组成和演化提供了思路。这种造山橄榄岩以无单斜辉石尖晶石相的斜方辉石至纯橄榄岩为主。_{高橄榄石 Mg#（高达 92.4）、高尖晶石 Cr# (74–87) 和低斜方辉石 Al 2} O ₃（大部分 < 1.0 wt.%）表明了耐火性。锆石、角闪石、金云母、磷灰石和富含 LREE 的斜方辉石的出现，拉曼探针分析显示锆石中含有角闪石和金云母内含物，证明了 ca 处地幔的广泛流体驱动交代作用。420 Ma（U-Pb 锆石）。高尖晶石型TiO ₂含量（0.4–1.4 wt.%）、富含 Cl 的磷灰石和含水二次相表明交代剂是挥发性的（CO ₂  + H ₂ O）和富含 TiO ₂的。较高的氧逸度 (Δlog f O ₂ (FMQ) > 2.5) 加上橄榄岩的高尖晶石 Cr# 表明它们形成于高度氧化的超俯冲带环境中。原位 ⁸⁷ Sr/ ⁸⁶ Sr _i角闪石和磷灰石数据表明，交代流体具有轻度至中度放射性 (0.7032–0.7090)，因此可能部分来源于将华北和扬子克拉通分隔开的俯冲洋壳。非常低¹⁷⁶ Lu/ ¹⁷⁷ Hf (大多 < 0.0002) 的交代锆石和与桐柏造山带弧相关岩浆相似的 ε _Hf (t) 表明锆石在亚弧地幔改造过程中生长。与寄主片麻岩并置发生在 410 Ma 之后和磷灰石冷却至 340 Ma 期间 U-Pb 闭合之前。因此，六树庄橄榄岩记录了华北和扬子克拉通碰撞前古生代亚弧地幔楔的强烈交代作用。