Trans‐lithospheric faults represent weak zones where some of the most intense interaction between the lithospheric mantle and melts occurs. We carried out detailed petrological observations and mineral chemical analyses of feldspar‐bearing wehrlites entrained in the Mesozoic basalts from Liaoyuan, northeastern North China Craton (NCC) to obtain new insights into the nature and consequences of wehrlitization. Wehrlites (n  = 12) show textural evidence for replacement of orthopyroxene by clinopyroxene, combined with low Ti/Eu (692–4,425) and variable, though generally high, Ca/Al, (La/Yb)_N, and Zr/Hf in clinopyroxenes. This is ascribed to interaction with a silica‐undersaturated, carbonated silicate melt. Feldspar with variable K₂O (0.17–9.84 wt.%) and CaO (0.03–12.8 wt.%) and some clinopyroxene likely formed by decomposition of amphibole and mica during heating prior to entrainment. Integrated with data from peridotite xenoliths in Cenozoic basalts along the Tan‐Lu fault belt (TLFB), these observations indicate deep volatile‐rich melt metasomatism. This may have occurred during a known Late Cretaceous to Early Tertiary extensional stage and was precursory to basaltic magmatism in the north‐south direction along the TLFB. We suggest that wehrlitization beneath the TLFB—and elsewhere—monitors the passage and mobility of carbonated melts linked to lithospheric thinning up to decratonization. Upward transport of the wehrlitizing carbonated melts through the massive TLFB and ultimate degassing of CO₂ at the surface during its extensional stage may have contributed to the mid‐Cretaceous greenhouse climate.

中文翻译：

---

跨岩石圈断层加湿的原因和后果：华北克拉通Tan-Lu断层带中生代玄武岩-Borne Wehrlite Xenoliths的证据

跨岩石圈断层代表了软弱的区域，岩石圈地幔和熔体之间发生了一些最强烈的相互作用。我们对华北克拉通东北部（NCC）辽源中生代玄武岩中夹带的长石辉绿岩进行了详细的岩石学观察和矿物化学分析，从而获得了对增湿作用的性质和后果的新见解。Wehrlites（n  = 12）显示出用斜发rox石替代邻苯二茂铁的证据，结合低Ti / Eu（692-4,425）和可变的（尽管通常较高），Ca / Al，（La / Yb）_N和Zr / Hf斜柏。这归因于与二氧化硅不饱和的碳酸硅酸盐熔体的相互作用。变量K _2的长石O（0.17–9.84 wt。％）和CaO（0.03–12.8 wt。％）以及一些夹着辉石的物质，可能是夹带前加热过程中闪石和云母分解而形成的。结合Tan-Lu断裂带（TLFB）新生代玄武岩中橄榄岩异种岩的数据，这些观察结果表明，深层挥发性丰富的熔体交代作用。这可能发生在已知的白垩纪晚期至第三纪早期伸展阶段，并且是沿TLFB沿南北方向的玄武岩浆作用的先兆。我们建议在TLFB下以及其他地方进行白化作用，以监测与岩石圈变薄直至克拉通作用有关的碳酸盐熔体的通过和迁移。加湿的碳酸化熔体通过大量的TLFB向上传输并最终将CO ₂脱气 表层伸展期的地表温度可能有助于白垩纪中期的温室气候。