Abstract Proterozoic sedimentary covers in the Helan-Qianli Mountain area, western margin of the North China Craton (NCC), include the Huangqikou, Wangquankou and Zhengmuguan formations from bottom to top. The Huangqikou Formation, mainly distributed in the Middle Helan Mountain (MHM), North Helan Mountain (NHM) and Qianli Mountain (QM), is composed of conglomerate, quartz sandstone and silty-argillaceous shale that are locally metamorphosed into quartzite and slate. Detrital zircon U-Pb dating and stratigraphic correlation bracket that the Huangqikou Formation deposited during 1.75-1.60 Ga. Petrologic and geochemical features suggest that the provenance was sourced from felsic rocks and pre-existed sedimentary rocks. U-Pb ages of detrital zircons from the Huangqikou Formation in the MHM area yield age ranges at 2.5-2.35 Ga, 2.2-2.0 Ga and 1.95-1.8 Ga, while those in the NHM-QM areas yield age ranges at 2.5-2.4 Ga, 2.0-1.95 Ga and 1.85-1.78 Ga. The remarkable geochronological and isotopic similarity suggests that the early Paleoproterozoic granitic gneiss in the Ordos Block and Zhaochigou complex in the Khondalite Belt are the dominant source rocks for the Huangqikou Formation in the MHM. However, the provenances of the Huangqikou Formation in the NHM-QM are dominated by the granitoids in Guyang area of the Yinshan Block, the S-type granites and paragneisses in the Khondalite Belt and the TTG gneisses, Bayanwulashan complex and Boluositanmiao complex in the Alxa Block, as well as a small amount basement rocks in Alxa Block. The characteristics of geochemistry, provenance and regional geological data indicate that the Huangqikou Formation deposited in a rift basin. Besides, detritus sourced from the Alxa Block in the clastic sedimentary rocks of the Huangqikou Formation imply that the Alxa Block was already a part of the NCC before ca.1.75 Ga. The U-Pb age and Lu-Hf isotopic characteristics of detrital zircons from the Statherian show that rapid generation of juvenile crust in the western Block was at 2.9-2.7 Ga, yet the ca.2.5 Ga magmatic activity strongly reworked pre-existed crust with negligible juvenile crust generation. The magmatic activities quite possibly developed in the Western Block during the global magmatic shutdown (2.45-2.2 Ga).

中文翻译：

---

华北克拉通西缘斯塔瑟阶黄旗口组碎屑锆石U-Pb年龄、Hf同位素组成及全岩地球化学特征：对物源和构造演化的启示

摘要 华北克拉通西缘贺兰-千里山地区元古界沉积盖层，自下而上包括黄旗口组、望泉口组和郑木关组。黄旗口组主要分布在贺兰山中段（MHM）、贺兰山北部（NHM）和千里山（QM），由局部变质为石英岩和板岩的砾岩、石英砂岩和粉质泥质页岩组成。黄旗口组沉积于1.75-1.60 Ga的碎屑锆石U-Pb定年和地层对比支架。岩石和地球化学特征表明物源来自长英质岩和先存沉积岩。MHM区黄旗口组碎屑锆石U-Pb年龄范围为2.5-2.35 Ga、2.2-2.0 Ga和1.95-1。8 Ga，而NHM-QM地区的产时范围为2.5-2.4 Ga、2.0-1.95 Ga和1.85-1.78 Ga。显着的年代学和同位素相似性表明鄂尔多斯地块和赵池沟杂岩中的早古元古代花岗片麻岩Khondalite 带是 MHM 中黄旗口组的主要烃源岩。而NHM-QM黄旗口组物源以银山地块固阳地区花岗岩类、孔达岩带S型花岗岩和副片麻岩以及阿拉善地区TTG片麻岩、巴彦乌拉山杂岩和博罗斯坦庙杂岩为主。块体，以及阿拉善块体中的少量基底岩。地球化学特征、物源特征和区域地质资料表明，黄岐口组沉积于裂谷盆地。除了，黄旗口组碎屑沉积岩中阿拉善地块的碎屑表明阿拉善地块在约 1.75 Ga 之前已经是华北克拉通的一部分。 Statherian 碎屑锆石的 U-Pb 年龄和 Lu-Hf 同位素特征表明西部地块在 2.9-2.7 Ga 快速生成新生地壳，而约 2.5 Ga 的岩浆活动强烈改造了先前存在的地壳，新生地壳的生成可以忽略不计。西地块的岩浆活动很可能是在全球岩浆关闭期间（2.45-2.2 Ga）发展起来的。Statherian碎屑锆石U-Pb年龄和Lu-Hf同位素特征表明，西部地块2.9-2.7 Ga快速生成新生地壳，而约2.5 Ga的岩浆活动强烈改造了先存地壳可忽略不计的幼壳生成。西地块的岩浆活动很可能是在全球岩浆关闭期间（2.45-2.2 Ga）发展起来的。Statherian碎屑锆石U-Pb年龄和Lu-Hf同位素特征表明，西部地块2.9-2.7 Ga快速生成新生地壳，而约2.5 Ga的岩浆活动强烈改造了先存地壳可忽略不计的幼壳生成。西地块的岩浆活动很可能是在全球岩浆关闭期间（2.45-2.2 Ga）发展起来的。