This study focuses on the geology, geochemistry, Sr-Nd isotopes and their tectonic settings of three types of basalts in Diyanmiao ophiolite in the Xar Moron area located on the eastern margin of the Central Asian Orogenic Belt. Type I basalts are oceanic tholeiites with a depleted light rare earth element (LREE) pattern, which are similar to the typical N-mid-oceanic ridge basalt (MORB) and suggests that they were formed at a mid-oceanic ridge. The initial ⁸⁷Sr/⁸⁶Sr ratios of Type I basalts range from 0.703 966 to 0.705 276 and the ε_Nd(t) values are from 16.49 to 17.15, indicating that they were derived from a depleted mantle source. Type II basalts belong to the medium-potassium calc-akaline series and have the geochemical characteristics of Nb-enriched basalt (NEB) with high Nb content (14.5 ppm) and strong enrichment in LREEs, implying that they were created by the partial melting of mantle wedge peridotite that previously metasomatized by slab melts. Type III basalts are high-Al basalt (HAB) with high-Al contents (Al₂O₃=16.75 wt.%–18.00 wt.%), distinct Nb depletion and high Th/Yb ratios. Thus they were likely generated in a normal island-arc setting. Therefore, the association of MORB, NEB, and HAB in the study area may be due to the subduction of a mid-oceanic ridge, and the Diyanmiao ophiolite is proposed to be formed in the forearc setting of a mid-oceanic ridge subduction system.

这项研究的重点是位于中亚造山带东缘的Xar Moron地区的迪彦庙蛇绿岩中三种类型的玄武岩的地质，地球化学，Sr-Nd同位素及其构造背景。I型玄武岩是具有稀有稀土元素（LREE）模式的海洋型菱铁矿，与典型的N中洋脊玄武岩（MORB）相似，表明它们是在中洋脊形成的。初始⁸⁷ SR / ⁸⁶ SR类型我玄武岩的比例范围为0.703到966 0.705 276和ε_的Nd（吨）值介于16.49到17.15之间，表示它们是从枯竭的地幔来源获得的。II型玄武岩属于中等钾钙碱性系列，具有Nb含量高（14.5 ppm）的Nb富集玄武岩（NEB）的地球化学特征，并且在LREE中具有很强的富集性，这表明它们是通过部分熔融而形成的。以前被板状体交代的地幔楔形橄榄岩融化。III型玄武岩是具有高Al含量的高Al玄武岩（HAB）（Al ₂ O ₃= 16.75 wt。％– 18.00 wt。％），明显的Nb耗尽和高Th / Yb比。因此，它们很可能是在正常的岛弧环境中产生的。因此，研究区的MORB，NEB和HAB的联系可能是由于洋中脊的俯冲作用，而迪岩庙蛇绿岩被认为是在中洋俯冲系统的前臂环境中形成的。