One is that these basalts are confined to some ancient basins .
其一是玄武岩只存在于部分古老的盆地地区。
The radiolaria fossils and submarine basalts which are first discovered afford us new material to discuss about the stratigraphical time and tectonic background of this area in devonian period .
首次在该区发现放射虫化石和海相玄武岩地层。为探讨该区泥盆系的时代以及大地构造环境提供了新的资料。
Feiren and colleagues , including scientists from nasa 's ames research center in california , chose compositions based on weathered basalts for the martian fluids in their model to match the chemical compositions of rock found at mars landing sites .
