标明日期的 LA-MC-ICPMS U-Pb 在 Ningwu 叮当响盆从上面的含碳的太原形成(N-8 ) 在由岩屑形成的锆石上被执行了,北方中国 Craton (NCC ) 的西方。72 由岩屑形成的锆石谷物的年龄被划分成三个组:303 320 妈(6 谷物) , 1631 2194 妈(37 谷物,在 1850 妈达到顶点) , 2318 2646 妈(29 谷物,在 2500 妈达到顶点) 。由岩屑形成的锆石组 2 和组 3 多半从 NCC 的地下室被导出。组 1 锆石展览 176Hf/177 Hf 比率从 0.281725 ~ 0.282239 ,与相应否定 ɛ −12.4 −30.3 的 Hf (t) 价值和旧 Hf 为 1.4 2.2 Ga 的年龄建模。这些特征在 NCC 的北边缘上从内部蒙古 Paleo 高举(IMPU ) 含碳的火的锆石显示出强壮的相似到那些,但是 Xing-Meng Orogenic 带与那些显著地不同,建议太原形成的来源部分来自 IMPU。组 1 的所有由岩屑形成的锆石有相对高的 Th/U 比率(】 0.67 ) ,显示 magmatic 起源。吝啬的年龄(304 ± 6 妈) 二最年轻的谷物接近太原形成的 depositional 年龄,建议一强壮构造高举并且在 IMPU 的 magmatism 在期间晚含碳。这篇论文为 NCC 的北边缘的激活提供重要地质的证据在晚古生代。
LA-MC-ICPMS U-Pb dating has been performed on detrital zircons from the Upper Carboniferous Taiyuan Formation (N-8) in the Ningwu-Jingle Basin, west of the North China Craton (NCC). The ages of 72 detrital zircon grains are divided into three groups: 303--320 Ma (6 grains), 1631--2194 Ma (37 grains, peaked at 1850 Ma), 2318--2646 Ma (29 grains, peaked at 2500 Ma). Detrital zircons of Group 2 and Group 3 were likely derived from the basement of the NCC. Group 1 zircons exhibit ^176Hf/^177Hf ratios ranging from 0.281725 to 0.282239, with corresponding negative εHf(t) values of -12.4--30.3 and old Hf model ages of 1.4--2.2 Ga. These characteristics show a strong resemblance to those of Carboniferous igneous zircons from the Inner Mongolia Paleo-uplift (IMPU) on the northern margin of the NCC, but differ significantly from those of the Xing-Meng Orogenic Belt, suggesting that the source of the Taiyuan Formation partly came from the IMPU. All detrital zircons of Group 1 have relatively high Th/U ratios (〉 0.67), indicating a magmatic origin. The mean age (304± 6 Ma) of the two youngest grains is close to the depositional age of the Taiyuan Formation, suggesting a strong tectonic uplift and mag- matism in the IMPU during the Late Carboniferous. This paper provides important geological evidence for the activation of the northern margin of the NCC in the Late Paleozoic.