Wang Wenbo, Chu Xu, Zhang Jian, Cui Ying, Chen Xuegen, Wang Yue, Su Shangguo
School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100010 China.
Department of Earth Sciences, University of Toronto, Toronto, ON M5S 3B1 Canada.
Commun Earth Environ. 2024;5(1):728. doi: 10.1038/s43247-024-01841-6. Epub 2024 Nov 21.
In response to westward subduction of the Paleo-Pacific, the North China Craton experienced the uplift of an eastern coastal plateau followed by subsidence in the Early Cretaceous, which potentially drove a shift in climatic patterns. Here we use the oxygen isotope ratios of garnets from magmatic-hydrothermal ore systems to infer the origins and signatures of mineralization fluids during this tectonic transition. The garnet oxygen isotope values range from approximately -11.4 to +13.5‰, with extremely depleted oxygen isotope ratios exclusively found in the northern margin, indicating extensive involvement of meteoric and lacustrine fluid in the back-arc hinterland. This geological record aligns with climate modeling exhibiting that the coastal plateau amplified northeastward transport of moisture from tropical Tethyan Ocean. The long-distance transport strongly depleted O and H (D). As the cratonic lithosphere thinned and the plateau subsided, the Pacific influences began to dominate the climatic pattern of East Asia.
响应古太平洋板块向西俯冲，华北克拉通在早白垩世经历了东部沿海高原隆升随后的沉降，这可能驱动了气候模式的转变。在此，我们利用岩浆热液成矿系统中石榴石的氧同位素比值来推断该构造转换过程中成矿流体的来源和特征。石榴石氧同位素值范围约为-11.4至+13.5‰，极低的氧同位素比值仅出现在北缘，表明大气降水和湖水在弧后腹地广泛参与。这一地质记录与气候模拟结果一致，显示沿海高原增强了来自热带特提斯洋的水汽向东北方向的输送。这种长距离输送使氧和氢（氘）显著亏损。随着克拉通岩石圈变薄和高原沉降，太平洋的影响开始主导东亚的气候模式。
