【摘要】 根据昌乐火山岩结晶程度差、成分分异大、显微镜下难以鉴定岩石类型等特点，运用两种岩石化学计算法对团山子、苍山、临朐等火山口熔岩岩样进行了计算和分析，结合岩石薄片资料，确定了其矿物组合和岩石类型．研究表明，不同类型火山岩的岩石化学特征存在着差异，这种差异可能影响岩石矿物的结晶程度，在相同温度和压力下，基性程度偏高的岩浆，其结晶程度偏好．更多还原

【Abstract】 Valcanic rocks at Changle area have poor crystallinity and obvious composition differ-entiation. It is difficult to determine the rock types under micrcoscope. This paper analyzes the volcanicrock specimes from three types of volcanic craters at Changle area by using two kinds of calculationmethods for rock chemical property. With the data of rock-section , the mineral assemblages and rocktypes were determined , and the chemical proporties of this kind of volcanic rock were studied. The re-sults showed that the chemistry properties of the three rocks are different. This differentiation affectedthe crystallinity of rocks.更多还原