1) oceanic island basalts
大洋岛屿玄武岩
1.
Low-temperature alteration of oceanic island basalts and their contribution to transition metal cycle of the ocean;
大洋岛屿玄武岩低温蚀变作用及其对大洋过渡金属循环的贡献
2) oceanic island basalt
洋岛玄武岩
1.
The helium isotope component ( 3He/ 4He) of oceanic island basalt (OIB) exhibits geographic diversity.
洋岛玄武岩 (OIB)氦同位素组成 (3 He 4 He)在地理分布上具有非均匀性特征。
2.
The basalt has high abundances of large ion lithophile elements(LILE),high field strength elements(HFSE),and light rare earth lements(LREE),suggesting characteristics of oceanic island basalt(OIB).
玄武岩具有富集大离子亲石元素与高场强元素以及轻稀土富集等洋岛玄武岩的特点。
3) oceanic basalt
大洋玄武岩
1.
From the three-components mixing equation obtained, it can be seen that the concept of "mantle plane" is incorrect, meanwhile,the data of Nd, Sr and Ph isotopes of oceanic basalts show no e.
从三元混合方程的展开形式可以看出,“地慢面”的概念是不能成立的,同时大洋玄武岩Nd,Sr和Pb同位素组成数据也并不支持大洋玄武岩为三元混合作用所形成这一假设。
4) oceanic island basalt(OIB)
洋岛玄武岩(OIB)
5) ocean island alkaline basalt
洋岛碱性玄武岩
1.
Its contents are similar to those of EM Ⅰ OIB from the Gough islands,and show ocean island alkaline basalt characteristics including the discriminant diagrams of tectonic settings for volcanics,which implies that the Hercynian.
海西期火山岩高度富集轻稀土元素和明显富集Rb、Ba、K等大离子亲石元素与Nb、Ta、Ti、P等高场强元素,无Nb、Ta、Ti亏损等特点,表明其具有大陆裂谷碱性玄武岩和洋岛碱性玄武岩的特征;以其不相容元素比值,相当于Gough岛EMⅠOIB型洋岛玄武岩,其构造环境判别图进一步印证了海西期火山岩形成于洋岛碱性玄武岩环境。
6) OIB
洋岛型玄武岩
1.
Based on geochemical signatures of metabasic volcanic rocks, two types of basalt in the Grove Mountains arerecognized, namely, oceanic island basalt (OIB) and Mid-oceanic ridge basalt (MORE).
东南极格罗夫山变质基性岩的地球化学研究表明,该区存在两类玄武岩,即洋岛型玄武岩(OIB)和洋中脊型玄武岩(MORB)。
补充资料:玄武岩
玄武岩 basalt 基性喷出岩的一种。成分相当于辉长岩。灰黑色。常具气孔状、杏仁状构造和斑状结构。斑晶为橄榄石、辉石、基性长石等;基质一般为细粒或隐晶质。按次要矿物的不同,可划分为橄榄玄武岩、紫苏辉石玄武岩等;按结构构造,可分为气孔状玄武岩、杏仁状玄武岩等;按化学成分和矿物成分,可分为高铝玄武岩、碱性玄武岩和拉斑玄武岩等。由于玄武岩浆粘度小,流动性大,喷溢地表易形成大规模熔岩流和熔岩被,但也有呈层状侵入体的,如岩床等。在高原地区常形成面积达数千至数十万平方千米的熔岩台地,有人称其为高原玄武岩,如印度的德干高原玄武岩。在海洋则构成海岭和火山岛。与之有关的矿产有铜、钴、硫黄、冰洲石、宝石等,其本身亦可作耐酸铸石原料。
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