摘要
根据火成岩中钛铁氧化物的研究发现,中-酸性侵入岩与火山岩中钛铁氧化物在MnO,TiO_2,Al_2O_3的含量上存在着明显的差别.利用(Al_2O_3+Cr_2O_3+V_2O_3)-MgO-(MnO+ZnO)三角图解,MnO(Mt)-MnO((?)),Al_2O_3(Mt)-TiO_2(Mt)图解,有助于区分火山岩与次火山岩,以及推测侵入岩的定位深度和岩浆冷凝速度,笔者等以安徽庐枞火山岩盆地中巴家滩岩体为例,检验这一方法的应用效果.
According to the study of Fe-Ti oxides in igneous rocks,there are some differnces of chemical composition of Fe-Ti oxides in MnO,TiO_2,Al_2O_3between intermediate-acid volcanic and intrusivc rocks. From the triangle composition diagram of (Al_2O_3+Cr_2O_3+V_2O_3)-MgO-(MnO+ZnO),diagram of MnO(Mt)-MnO(Il)and Al_2O_3(Mt)-TiO_2(Mt),a series of useful information for distingushing volcanic with subvolcanic rocks, inferring the depth of intrusive magma and cooling vclocity of magma can be obtained.As an cxample of using this mcthod,the Bajiatan igneous rocks in Lujang-Zhongyang volcanic basin are demostrated in this paper.
出处
《矿物岩石》
CAS
CSCD
1990年第3期41-48,共8页
Mineralogy and Petrology
关键词
火山岩
钛氧化物
铁氧化物
成份
Western United States
Eastern China
volcanic rocks.subvolcanic rocks
Fe-Ti oxides
