• 责任者：Liu Jianqiang (State Key Laboratory of Isotope Geochemistry ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Ren Zhongyuan
• 刊名：Geotectonica et Metallogenia
• 出版年：2013
• 卷期：37(3)
• 关键词：玄武岩 ; basalts ; 海南 ; Hainan Province
• 页码：p.471-488
• 图表：7 illus., 2 tables, 106 refs.
• 分类号：0801
• issnNo：ISSN1001-1552
• isbnNo：CN44-1595/P

     Identification of the source lithology for basalts is one of the fundamental issues in petrological studies. For decades, it was commonly considered that mantle peridotite was the only source lithology for basaltic magmas. However, numerous recent petrological and geochemical studies indicate that the mantle source is highly heterogeneous. In this paper, we summarize the different geochemical feathers of melts derived from partial melting of different ultramafic rocks. The results will be used to identify the source lithology for the Hainan basalts. Compared to partial melts of peridotite, the Hainan basalts have lower CaO contents and higher Fe/Mn, Zn/Fe, Zn/Mn ratios. Meanwhile, the olivine phenocrysts from the Hainan basalts have lower Ca, Mn and higher Ni, Fe/Mn than those of the olivines crystallized from partial melts of peridotite. The results of the melting experiments indicate that partial melts of dry mantle peridotite, peridotite ＋CO2, and hornblendite cannot match the chemical compositions of the Hainan basalts, while the pyroxenite melts can well match their geochemical characteristics. The OIB-like trace element compositions, such as Rb, Ba, Sr, Nb, Ta positive anomalies and Th, U negative anomalies of the Hainan basalts suggest that a recycled oceanic crust component was involved in the source of the Hainan basalts.