The paleoposition of the South Qinling Belt is a crucial key to understanding the collisional process between the North and South China blocks. In order to identify the paleogeography of the South Qinling Belt during the Early Triassic and its correlation to the North and the South China blocks, combined paleomagnetic studies have been conducted on the Lower Triassic sedimentary rocks in the South Qinling Belt. After systematic thermal demagnetization, a high‐temperature characteristic remanence was isolated from 133 specimen embracing 22 sites with a mean direction of D = 330.5°, I = 27.7° (α₉₅ = 2.5°). The positive fold and reversal tests suggest that the characteristic remanence was acquired during deposition. This characteristic remanence corresponds to a mean paleopole at φ_p = 7.2°E, λ_p = 62.5°N (A₉₅ = 2.4°), indicating a paleolatitude of ~23.6°N for the South Qinling Belt. These new data are in concordance with the coeval paleomagnetic pole of the North China Block but are distinctly different from that of the South China Block with ~10.0° paleolatitude and ~73.6°declination differences. Together with the regional geology, our new data suggest that the South Qinling Belt had amalgamated with the North China Block along the Shangdan Suture by the Early Triassic times; however, it was still separated from the South China Block by the Mianlue Ocean up to the Early Triassic. The final collision between the North and South China blocks resulted from a ~73.6° clockwise rotation of the South China Block relative to the South Qinling Belt along the Mianlue Suture during the Late Triassic.

中文翻译：

---

南秦岭地带下三叠统地层的古磁约束：华北与华南地块之间离散地层的证据

南秦岭带的古沉积是了解华南与华南块体碰撞过程的关键。为了确定早三叠世南秦岭带的古地理及其与华北和华南块体的相关性，已对南秦岭三叠系下沉积岩进行了古地磁研究。系统的热退磁后，高温特性剩磁从133个样本拥抱22个场所的平均方向分离d = 330.5°，我= 27.7°（α ₉₅= 2.5°）。阳性折叠和反转测试表明，在沉积过程中获得了特征剩磁。该特征剩磁对应于平均古地磁极在φ _p = 7.2°E，λ _p = 62.5°N（甲₉₅= 2.4°），表明南秦岭带的古纬度约为23.6°N。这些新数据与华北地块的同时期古磁极一致，但与华南地块的古纬度明显不同，古纬度为〜10.0°，赤纬度为〜73.6°。与区域地质一起，我们的新数据表明，到三叠纪早期，南秦岭带与上丹缝合带的华北地块已经合并。但是，它仍然被绵略洋与华南地块隔开，直到三叠纪早期。华北地块与华南地块之间的最终碰撞是由于三叠纪晚期华南地块相对于南秦岭带沿绵略缝合带顺时针旋转了约73.6°。