The Wanzi supracrustal association locates in the Fuping Complex, middle Trans-North China Orogen, and it was generally considered before as a lithological unit that underwent medium pressure metamorphism. The newly discovered gedrite-bearing gneiss, gedrite-free gneiss, and amphibolite of the Wanzi supracrustal association show abundant mineral assemblages with complex reaction textures, which are critical clues to retrieve the metamorphic evolution of this area. Gedrite-bearing/free gneiss samples mainly consist of garnet porphyroblast plus matrix minerals including biotite, kyanite, sillimanite, staurolite, ±gedrite, plagioclase, quartz, as well as accessory minerals such as ilmenite, magnetite, apatite, monazite, and zircon. Amphibolite samples are generally composed of garnet porphyroblast plus matrix minerals amphibole, ±biotite, plagioclase, quartz, as well as accessory minerals including ilmenite, magnetite, and zircon. Two to four generations of metamorphic mineral assemblages formed at the prograde (M1), peak (M2), and retrograde (M3-M4) stages have been identified from these samples, recording clockwise P-T paths including sequential near-isothermal decompression (ITD) and near-isobaric cooling (IBC) segments, indicative of convergence tectonic settings. The peak P-T conditions of these samples are different, ranging from 8.2 to 13 kbar and 695 to 822 °C. SIMS/SHRIMP U-Pb dating of metamorphic zircon yields ²⁰⁷Pb/²⁰⁶Pb age of 1838–1821 Ma, representing the metamorphic event. Combined with the previous data, the Wanzi supracrustal association is inferred to have undergone middle to high pressure metamorphism during 1.84–1.82 Ga, which was involved in the subduction and/or collision event between the Western and Eastern Blocks and led to the final assembly of the North China Craton.

万梓系上地壳组合位于华北造山带中部富平复合体中，以前被普遍认为是经历了中压变质作用的岩性单元。新发现的万梓系表壳结合体中的含铁素体的片麻岩，不含铁素体的片麻岩和闪石显示出丰富的矿物组合和复杂的反应质地，这是恢复该地区变质演化的关键线索。含菱铁矿/游离片麻岩样品主要由石榴石成矿细胞和基体矿物组成，包括黑云母，蓝晶石，硅线石，方铁石，亚铁酸盐，斜长石，石英以及辅助矿物，如钛铁矿，磁铁矿，磷灰石，独居石和锆石。闪石样品通常由石榴石成岩细胞加上基质矿物闪石，黑云母，斜长石，石英以及钛铁矿，磁铁矿和锆石等辅助矿物。从这些样品中已鉴定出在前进（M1），高峰（M2）和逆行（M3-M4）阶段形成的2至4代变质矿物组合，顺时针记录PT路径包括相继的近等温减压（ITD）和近等压冷却（IBC）段，表明收敛的构造背景。这些样品的PT峰值条件不同，范围为8.2至13 kbar和695至822°C。变质锆石的SIMS / SHRIMP U-Pb测年结果​​表明年龄为1838-1821 Ma的²⁰⁷ Pb / ²⁰⁶ Pb年龄，代表了变质事件。结合先前的数据，推测万子上壳组合在1.84–1.82 Ga期间经历了中高压变质作用，这与西部和东部地块之间的俯冲和/或碰撞事件有关，并导致了最后的组装。华北克拉通。