As a main part of the North China craton collage system, the tectonic origin of the Bainaimiao arc terrane is still hotly debated, especially its relationship with the North China craton. Thus, we report on a field-based petrological and zircon U-Pb-Hf isotopic study of (meta-)sedimentary and volcanic rocks from the Bainaimiao arc terrane and northern margin of the North China craton in the Damao region. The lower and middle successions of the Bayan Obo Group from the northern North China craton, including the Dulahala, Jianshan, Halahuogete, and Bilute Formations, were deposited ca. 1.81–1.35 Ga and show age peaks at 1.85, 1.90, 2.0, and 2.5 Ga. This age pattern is in accordance with the coeval and extensively outcropped metamorphosed basement rocks of the northern North China craton. The upper succession, including the Bayinbaolage and Hujiertu Formations, deposited ca. 1.19–0.92 Ga, shows age peaks at ca. 1.35, 1.57, and 1.69 Ga, and sediments were derived from coeval rift-related magmatism characterized by a significant increase in positive εHf(t) values in detrital zircons. Thus, the Bayan Obo Group can be subdivided into North China craton basement–derived sediments and Mesoproterozoic to Neoproterozoic rift-derived sediments, and the change of the provenance was probably caused by the ca. 1.35–1.30 Ga rifting event related to the breakup of the Nuna supercontinent. In the Bainaimiao arc terrane, zircon U-Pb geochronological results of (meta-)sedimentary rocks indicate they were formed in the Neoproterozoic and Paleozoic and have mainly late Paleoproterozoic to Neoproterozoic ages (ca. 0.6–0.9, 1.1–1.2, 1.4–1.7, and 1.8–2.0 Ga) with peaks at ca. 0.86, 0.96, 1.15, 1.47, 1.66, 1.75, 1.80–1.87, and 1.94 Ga. The abundant Neoproterozoic ages for the Bainaimiao arc terrane detrital zircons are distinct from the scarcity of these ages in the northern North China craton, southern Siberia (age peaks at ca. 1.87, 1.92, and 2.0 Ga), and Mongolia (age peak at ca. 0.62, 0.83, 0.93, 1.84, and 2.0 Ga), but they are similar to the features of the Tarim craton (age peaks at ca. 0.62, 0.85, 1.15, 1.47, 1.66, 1.75–1.80, 1.85, and 1.94 Ga). Together with the recognition of a possible preexisting Proterozoic basement (ca. 0.7–2.0 Ga) in the Bainaimiao arc terrane, as evidenced by the Hf model ages of continental arc magmatism in the Bainaimiao arc terrane, this late Paleoproterozoic to Neoproterozoic detritus probably resulted from local recycled sedimentation, and the preexisting Bainaimiao arc terrane basement rifted away from a continent with Tarim craton affinity. The rifting probably occurred between ca. 0.6 and 0.52 Ga, because the reworking of the Precambrian rocks in the North China collage system occurred between ca. 520 and 230 Ma.

中文翻译：

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中亚南部造山带白乃庙弧状地层的构造成因：来自大帽地区沉积岩浆岩的证据

作为华北克拉通拼贴体系的主要组成部分，白乃庙弧形地层的构造起源仍受到人们的热烈讨论，特别是它与华北克拉通的关系。因此，我们报道了大白地区白乃庙弧弧地层和华北克拉通北缘的（元）沉积和火山岩的野外岩石学和锆石U-Pb-Hf同位素研究。来自华北克拉通北部的巴彦鄂博群的中下演替层沉积于约拉哈拉，尖山，哈拉霍格特和比卢特组。1.81–1.35 Ga并在1.85、1.90、2.0和2.5 Ga处显示出年龄峰值。该年龄模式与华北克拉通北部的同年龄并广泛露头的变质基底岩相符。上层继承人 包括巴音包拉格和胡吉尔图组。1.19–0.92 Ga，显示出大约在年龄的峰值。1.35、1.57和1.69 Ga和沉积物来自与同裂谷相关的岩浆作用，特征是碎屑锆石中的εHf（t）正值显着增加。因此，巴彦鄂博群可分为华北克拉通基底衍生的沉积物和中元古代至新元古代裂谷衍生的沉积物，并且物源的变化可能是由ca造成的。1.35–1.30 Ga裂谷事件与努纳河超大陆的破裂有关。在白乃庙弧状地层中，（元）沉积岩的锆石U-Pb年代学结果表明它们形成于新元古代和古生代，并且主要是晚古元古代到新元古代（约0.6-0.9、1.1-1.2、1.4-1.7）。以及1.8–2。0 Ga）的峰值位于大约0。0.86、0.96、1.15、1.47、1.66、1.75、1.80-1.87和1.94 Ga。约在1.87、1.92和2.0 Ga处出现最大峰）和蒙古（约0.62、0.83、0.93、1.84和2.0 Ga处出现年龄峰），但它们与塔里木克拉通的特征相似（在ca处出现年龄峰0.62、0.85、1.15、1.47、1.66、1.75-1.80、1.85和1.94 Ga）。伴随着对白乃庙弧地层可能存在的元古界基底（约0.7–2.0 Ga）的认识，如白乃庙弧地层大陆弧岩浆作用的Hf模型年龄所证明，这一晚古元古代至新元古代碎屑可能是由于当地回收的沉淀物，并且先前存在的白乃庙弧形地层地下室从与塔里木克拉通有亲和力的大陆上裂开了。裂谷大概发生在大约 0.6和0.52 Ga，因为华北拼贴系统中的前寒武纪岩石发生了返工。520和230 Ma。