摘要
内蒙古道郎山位于华北板块北缘,区内出露的花岗岩主要为燕山期岩体,岩石类型主要为黑云母花岗岩。岩石地球化学特征表现为强过铝质、富硅贫钙。岩石的里特曼指数平均值为1.80,碱度指数AR平均值为2.6,属于钙碱性系列岩石。岩体分异指数高,结晶演化程度高;稀土总量偏低,具有明显Eu负异常。推测岩体是由成熟度较高的泥质岩类在较低的温度下部分熔融形成的。
The Daolangshan region is located in the northern margin of North China Plate.The outcropped rockbody are mainly Yanshanian biotite granite.Geochemical data show characteristics with rich aluminum,rich silicon and poor calcium contents.The rock Rittman index is an average of 1.80 and alkalinity index is an averaged of 2.6,belongs to calc-alkaline granite.The rockbody has a high differentiation index value,with a high degree of crystallinity evolution.The total REE content of granite body is low,with an obvious negative Eu anomaly.It is concluded that the rock body is formed from partially melting of the high maturity shale rocks in the low temperature.
出处
《现代地质》
CAS
CSCD
北大核心
2010年第4期762-766,共5页
Geoscience
关键词
花岗岩
地质特征
地球化学
道郎山
内蒙古
granite
geological characteristic
geochemistry
Daolangshan
Inner Mongolia
