The southern hainan mafic dykes are strongly enriched in lile with high nb / ta ratios , indicating a magma source reconstructed by silicic - melt through partial melting of ancient subducted slides . however , the northern hainan mafic dykes with chondritic nb / ta ratio should be derived from the fiuid - metasomatized mantle related to ancient subduction zone 瓊南基性巖脈強(qiáng)烈富k _ 2o等lile和具有較高nb ta比值,其地幔源區(qū)應(yīng)受到了古俯沖板片部分熔融形成的硅質(zhì)熔體的改造;而瓊中基性巖脈的nb ta比值接近于球粒隕石和morb值,應(yīng)為古俯沖帶含水流體交代的地幔源區(qū)的產(chǎn)物。
The paper based on synthesize domestic and foreign ' s study achievement about basalt , systematical review basalt research history , present condition about basalt formation contributing factor and it ' s magma source area quality , uses the basalt to distinguish the earth ' s mantle type , the connection basaltic magma evolution and continent dynamics , and uses the basalt to distinguish tectonic environment 系統(tǒng)地綜述了玄武巖的成因和巖漿源區(qū)性質(zhì)、利用玄武巖判別地幔類型、玄武質(zhì)巖漿的演化與大陸動力學(xué)關(guān)系,以及判別構(gòu)造環(huán)境等方面研究的現(xiàn)狀。