dacite造句

• By studying , the main conclusions have been achieved as follows : i . the volcanic rocks , as the result of the partial melting of enriched mantle , comprise calc - alkaline andesite and dacite and a few tholeiite
  通过研究，得出以下主要认识： 1 、火山岩为一套以钙碱性安山岩为主，含少量拉斑玄武岩和英安岩。
• The upper cretaceous jingzhushan formation in the biru basin , xizang consists of a succession of coarse - grained elastic rocks in the alluvial fan - fan delta depositional system , intercalated with intermediate - acidic volcanic rocks including dacite , andesite , quartz trachyandesite and rhyolite
  摘要上白垩统竞柱山组为一套冲积扇扇三角洲沉积体系的粗碎屑岩，间夹由英安岩、安山岩、石英粗安岩和流纹岩组成的中酸性火山岩。
• Xiongcun copper - gold ore deposit is located in gangdese metallogenetic belt with a large scale . the ore body mainly exists in the second lithoid unit ' s tuffs and the third lithoid unit ' s dacite tufa of the cretaceous volcanic stratum , which are not only mother rock but also mineralized body
  雄村铜金矿床处于冈底斯成矿带，矿床规模巨大，矿体主要赋存于白垩系火山岩地层第二岩性单元的黄铁绢英岩化硅化凝灰岩和第三岩性单元英安质疑灰岩中，上述岩石既是赋矿围岩又是矿化体。