The Jiao-Liao-Ji Belt (JLJB) is one of the Paleoproterozoic orogenic belts within the North China Craton (NCC), whose tectonic evolution is still controversial due to multiple magmatic/metamorphic events after its formation. To tackle this controversy, we conducted petrological, geochronological, geochemical and zircon Hf isotopic studies for the meta-mafic rocks from the North Liaohe Group (NLG) in the central JLJB. ²⁰⁷Pb/²⁰⁶Pb weighted average ages of 1849 ± 36 Ma and 1853 ± 13 Ma indicate that the protoliths of the amphibolites in the Shisixian area formed at ca. 1.85 Ga. Geochemically, the amphibolites belong to tholeiitic series; while the meta-gabbros can be divided into the low-Ti and high-Ti types: the former belongs to calc-alkaline series, whereas the latter belongs to tholeiitic series. The high-Ti rocks are enriched in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs; e.g., Ba, K and Pb), and depleted in heavy rare earth elements (HREEs) and high field strength elements (HFSEs; e.g., Nb, Ta, P and Ti). These rocks display slightly positive εHf(t) values (+1.40 to +2.02). The low-Ti meta-gabbros were most likely derived from the partial melting of the enriched lithospheric mantle in the spinel stability field, which was metasomatized by subduction-related fluids and/or melts with significant contamination of crustal material, while the amphibolites and high-Ti meta-gabbros were derived from partial melting of depleted asthenospheric mantle in the spinel stability field, which was metasomatized by limited subduction-related fluids and/or melts, coupled with fractional crystallization. The lithological and geochemical characteristics show that the low-Ti meta-gabbros formed in a magmatic arc environment, the high-Ti rocks formed in the later stage of a back-arc basin; while the amphibolites formed in a post-collisional extensional environment. Combined with literature data, we suggest that the JLJB experienced a process from subduction, collision, to extension: At ca. 2.2–2.1 Ga back-arc basin opened via southward subduction of an oceanic plate followed by northward subduction at ca. 2.1–1.91 Ga, and subsequently closed to form the JLJB at ca. 1.91 Ga, which led to the Longgang-Nangrim continental collision, and post-collision extension occurred at ca. 1.85 Ga along with the collapse of the collisional orogen.

胶辽吉带（JLJB）是华北克拉通（NCC）内的古元古代造山带之一，由于其形成后发生了多次岩浆/变质事件，其构造演化仍存在争议。为了解决这一争议，我们对吉林江山中部北辽河群（NLG）变镁铁质岩进行了岩石学、年代学、地球化学和锆石Hf同位素研究。²⁰⁷ Pb/ ²⁰⁶ Pb 加权平均年龄分别为1849±36 Ma和1853±13 Ma，表明石四县地区角闪岩的原岩形成年代约为1997年。 1.85 Ga。地球化学上，角闪岩属于拉斑岩系列；变辉长岩可分为低钛型和高钛型：前者属于钙碱性系列，后者属于拉斑岩系列。高钛岩石富含轻稀土元素（LREE）和大离子亲石元素（LILE；例如Ba、K和Pb），贫重稀土元素（HREE）和高场强元素（HFSE） ；例如，Nb、Ta、P 和Ti）。这些岩石显示出略为正的 εHf(t) 值（+1.40 至 +2.02）。低钛变辉长岩很可能源自尖晶石稳定场中富集的岩石圈地幔的部分熔融，其被俯冲相关的流体和/或熔体交代，对地壳物质造成严重污染，而角闪岩和高钛辉长岩则很可能源自尖晶石稳定场中富集的岩石圈地幔的部分熔融，并受到俯冲相关流体和/或熔体的交代，对地壳物质造成了严重污染。 -Ti 变辉长岩源自尖晶石稳定场中贫化软流圈地幔的部分熔融，通过有限的俯冲相关流体和/或熔体交代，并伴有分步结晶。岩性和地球化学特征表明，低钛变辉长岩形成于岩浆弧环境，高钛岩石形成于弧后盆地后期；而角闪岩则是在碰撞后的拉张环境中形成的。结合文献资料，我们认为JLJB经历了一个从俯冲、碰撞到伸展的过程： 2.2-2.1 Ga弧后盆地是由大洋板块向南俯冲、随后在大约2.2-2.1 Ga向北俯冲而打开的。 2.1–1.91 Ga，随后在大约 2.1–1.91 Ga 闭合形成 JLJB。 1.91 Ga，导致了Longgang-Nangrim大陆碰撞，碰撞后延伸发生在大约1.91 Ga。 1.85 Ga 伴随着碰撞造山带的塌陷。