Bulk-rock elemental and isotopic geochemistry and in situ analytical results for the West Qinling melilitite-nephelinite-carbonatite association

This comprehensive dataset contains bulk-rock elemental geochemistry and Sr-Nd-Pb-Mg-C-O isotopic analyses on the West Qinling melilitite-nephelinite-carbonatite associations, northeastern Tibetan Plateau. Detailed mineralogical observations (EPMA and LA-ICPMS analyses) and in situ Sr isotopic measurements of clinopyroxene and carbonate are also included in this dataset. It allows us to elucidate the petrogenetic relationships among melilitites, nephelinites, and carbonatites. It also provides new constrains on the role of lithospheric mantle assimilation in the formation of Si-undersaturated alkaline rocks. The findings will enhance our understanding of deep C-O volatile recycling in collision zones and contribute to broader discussions on the geodynamic mechanisms driving the lateral spreading of the Tibetan Plateau.

本综合数据集涵盖青藏高原东北部西秦岭地区黄长岩（melilitite）-霞石岩（nephelinite）-碳酸岩（carbonatite）组合的全岩元素地球化学数据与Sr-Nd-Pb-Mg-C-O同位素分析结果。数据集还包含详细的矿物学观测资料（电子探针显微分析（EPMA）与激光剥蚀电感耦合等离子体质谱（LA-ICPMS）分析），以及单斜辉石（clinopyroxene）与碳酸盐矿物（carbonate）的原位Sr同位素测试数据。本数据集可用于阐明黄长岩、霞石岩与碳酸岩三者之间的成岩成因联系，同时为岩石圈地幔同化作用在硅不饱和碱性岩形成过程中所发挥的作用提供新的约束依据。相关研究成果将加深我们对碰撞造山带深部C-O挥发分循环过程的认识，并为探讨驱动青藏高原侧向扩展的地球动力学机制提供科学支撑。