Fluid geochemistry in active fault zones has been proven to be sensitive to tectonic activity. The North China Craton (NCC) has attracted much attention because of its complex and intense tectonic activity. In this study, fluid geochemistry in the primary active fault zones in the NCC was investigated, including inference of its tectonic activity. Stronger degassing from soil and springs has been observed in the northeastern Tibetan Plateau (NETP) and the Zhang-Bo seismic zone (ZBSZ) than in the other seismic zones. Both geological soil gas and deep-derived gas (crust- or mantle-derived gas) from springs were concentrated there. Also, a comprehensive analysis has indicated that the development of new fractures might have occurred widely beneath the NETP and ZBSZ because of the strong regional tectonic activity there. The ³He/⁴He and ⁴He/²⁰Ne of gas from the springs in the ZBSZ suggest that the low-velocity zone 20– 40 km deep might be a magmatic intrusion derived from the mantle. However, crust-derived gas accompanied with a negligible mantle-derived component has been detected in the Diebu-Bailongjiang fault (DBF), the West Qinling fault (WQLF), and the Liupanshan fault (LPSF) in the NETP. There, the occurrence of more new fractures was probable, in accordance with the obvious δ¹⁸O shift of the water from the springs in the fault zones. This suggests that a channel flow, also depicted by the low-velocity zone 20– 40 km deep, could have formed within the crust and that the probable leading front reached the LPSF.

活动断层带的流体地球化学已被证明对构造活动很敏感。华北克拉通（NCC）因其复杂而强烈的构造活动而备受关注。在这项研究中，研究了华北克拉通主要活动断裂带的流体地球化学，包括对其构造活动的推断。青藏高原东北部（NETP）和张博地震带（ZBSZ）的土壤和泉水脱气比其他地震带更强。来自泉水的地质土壤气和深部气（地壳或地幔气）都集中在那里。此外，综合分析表明，由于NETP和ZBSZ下方区域构造活动强烈，新裂缝的发育可能广泛发生。³ _来自 ZBSZ 泉水的He/ ⁴ He 和⁴ He/ ²⁰ Ne 表明 20~40 km 深的低速带可能是来自地幔的岩浆侵入体。然而，NETP中的迭部-白龙江断裂（DBF）、西秦岭断裂（WQLF）和六盘山断裂（LPSF）均发现了壳源气，但地幔源成分可忽略不计。与断裂带泉水的明显δ ^{18 O 位移相一致，那里可能出现更多的新裂缝。}这表明在地壳内可能形成了同样由 20-40 公里深的低速带所描绘的通道流，并且可能的前锋到达了 LPSF。