Whole-rock major and trace element analyses for dykes and lavas of the Masirah Ophiolite, SE Oman

We present whole-rock major and trace element compositions of dykes and lavas from the Masirah Ophiolite (Oman). The data cover several sites within the two ophiolite nappes that are exposed on Masirah Island off the south-east coast of Oman and were collected during a 2018 field campaign as part of MJ's PhD project. The samples are fairly primitive and variably altered basalts that follow MORB differentiation trends and have varying degrees of immobile trace element enrichment. Together with crosscutting relationships observed in the field, these data show that D-MORB and E-MORB magmatism was contemporaneous at the Masirah palaeo-MOR spreading centre. The interpretation and discussion of these data form part of a manuscript submitted to Geochemistry, Geophysics, Geosystems.

本数据集报道了阿曼马西拉蛇绿岩（Masirah Ophiolite）中岩脉与熔岩的全岩主量元素及微量元素组成。本次数据覆盖阿曼东南沿海马西拉岛出露的两套蛇绿岩推覆体内部的多个采样点位，样品采集于2018年野外考察期间，为MJ博士学位研究项目的组成部分。所涉样品为具原始岩浆特征、蚀变程度各异的玄武岩，其演化趋势符合洋中脊玄武岩（MORB）的分异规律，并呈现出不同程度的惰性微量元素富集特征。结合野外观测到的穿切接触关系，本次数据证实，马西拉古洋中脊扩张中心同期存在亏损型洋中脊玄武岩（D-MORB）与富集型洋中脊玄武岩（E-MORB）岩浆作用。针对本次数据的解译与讨论内容，已作为研究稿件提交至《地球化学、地球物理学、地球系统》（Geochemistry, Geophysics, Geosystems）期刊。