columnar joint structure, as considered by various researchers long since, is only possible to develop in basic lava with low viscosity and high nuidity.
柱状节理构造历来被众多学者认为只能发育在粘度小、流动性大的基性熔巖中。
it is suggested basic lava and intermediate lava constitute the volcanic rocks by the testing of rare earth elements and trace elements in southern danghe mt.
甘肃南祁连褶皱带党河南山地区中奥陶世火山巖的巖石学和微量元素、稀土元素的地球化学等研究证明,本区火山巖由基性火山巖和中性火山巖组成。
in west guangxi, late paleozoic basic lava which were considered as the diabase, only scattered in devonian and lower carbonaceous as interlayers with limited thickness.
广西西部广泛分布的基性巖,过去被认为是侵入的辉绿巖,晚古生代的基性熔巖只在泥盆系和下石炭统中零星分布,呈夹层产出,厚度不大。