The Shuanghe garnet‐bearing paragneiss from the Dabie ultra‐high–pressure (UHP) orogen occurs as an interlayer within partially retrogressed eclogite. A first UHP metamorphic stage at 680°C, 3.8–4.1 GPa is documented by Zr‐in‐rutile temperatures coupled with phengite inclusions (Si = 3.55) in clinozoisite and grossular‐rich garnet. Relic matrix phengite and phengite inclusions in zircon rims display lower Si of 3.42. Combined with garnet compositions and Ti‐in‐zircon temperatures, they provide evidence for a second UHP metamorphic stage at 800–850°C, ~3.8 GPa. Such isobaric heating at UHP conditions has not been documented so far from the adjacent eclogites and other rock types in the Dabie orogen and indicates proximity to the hot, convecting mantle wedge. The dominant mineral assemblage consisting of plagioclase, epidote, biotite, and amphibole provides evidence for widespread retrogression during the exhumation of the UHP paragneiss. Several types of polyphase mineral inclusions were identified. Phengite inclusions hosted by clinozoisite are partially replaced by kyanite and K‐feldspar, whereas inclusions in host garnet consist of relic phengite, K‐feldspar, and garnet, indicating limited sub‐solidus dehydration of phengite by the reaction Ph→Kfs+Ky±Grt+fluid. Tightly intergrown K‐feldspar and quartz are preserved as inclusions with sharp boundaries and radial cracks in garnet. Analyses of whole inclusions also show small enrichments in light rare earth elements. These inclusions are interpreted to be derived from melting of an inclusion assemblage consisting of Ph+Coe±Czo. A third type of polyphase inclusion consists of typical nanogranite (Ab+Kfs+Qz±Ep) inclusions in recrystallized metamorphic zircon. Ti‐in‐zircon thermometry and the Si content of phengite included in these zircon domains indicate that melting occurred at 800–850°C and 3.8–4.0 GPa during isobaric heating at UHP conditions. The partial melting event led to an equilibration of trace elements in garnet, phengite, and apatite. Using published partition coefficients between these minerals and hydrous granitic melt, the trace element composition of the UHP anatectic melt can be constrained. The melts are characterized by high LILE contents and pronounced relative enrichments of U over Th and Ta over Nb. The REE are below primitive mantle values, likely due to the presence of residual clinozoisite and garnet during partial melting. So far, no major granitic bodies have been found that share the same trace element pattern as the partial melts from the UHP anatexis of the Shuanghe paragneiss.

中文翻译：

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斜纹岩、石榴石和锆石包裹体中双河超高压平行片麻岩中超高压退火的证据

来自大别超高压（UHP）造山带的含双河石榴石的副片麻岩作为部分后退榴辉岩中的夹层出现。在 680°C、3.8-4.1 GPa 下的第一个 UHP 变质阶段是通过金红石中的 Zr 温度与斜长岩和富含粗粒石榴石中的菱镁矿包裹体（Si = 3.55）相结合的记录。锆石边缘的遗迹基体菱镁矿和菱镁矿包裹体的 Si 较低，为 3.42。结合石榴石成分和锆石中钛温度，它们为在 800-850°C，~3.8 GPa 下的第二个 UHP 变质阶段提供了证据。这种在 UHP 条件下的等压加热到目前为止还没有在大别造山带中邻近榴辉岩和其他岩石类型的记录，这表明它靠近热的对流地幔楔。主要矿物组合包括斜长石、绿帘石、黑云母、和闪石提供了在 UHP 副片麻岩挖掘过程中广泛退化的证据。鉴定了几种类型的多相矿物包裹体。以斜长石为主体的菱镁矿包裹体部分被蓝晶石和钾长石取代，而寄主石榴石中的包裹体由残留的苯镁石、钾长石和石榴石组成，表明 Ph→Kfs+Ky±Grt 反应对菱镁矿的亚固相线脱水作用有限+流体。紧密共生的钾长石和石英被保存为石榴石中具有尖锐边界和径向裂缝的包裹体。对整个夹杂物的分析也显示出轻稀土元素的少量富集。这些夹杂物被解释为源自由 Ph+Coe±Czo 组成的夹杂物组合的熔化。第三种类型的多相包裹体由再结晶变质锆石中典型的纳米花岗岩 (Ab+Kfs+Qz±Ep) 包裹体组成。Ti-in-zircon 测温仪和这些锆石域中包含的硅藻土的 Si 含量表明，在 UHP 条件下等压加热期间，熔化发生在 800-850°C 和 3.8-4.0 GPa。部分熔化事件导致石榴石、菱镁矿和磷灰石中的微量元素达到平衡。使用这些矿物和含水花岗岩熔体之间公布的分配系数，可以限制超高压深熔熔体的微量元素组成。熔体的特征是高 LILE 含量和 U 相对于 Th 和 Ta 相对于 Nb 的显着相对富集。REE 低于原始地幔值，可能是由于部分熔融过程中残留斜纹岩和石榴石的存在。迄今为止，