摘要
在涞源地区侵入了大量以碱性为主的煌斑岩,这些煌斑岩是一套来自地幔深部的基性岩石。碱性煌斑岩SiO_2<46％,TiO_2≥1.5％,F≥5％;钙碱性煌斑岩SiO_2≥46％,TiO_2<1.5％,F<5％。碱性煌斑岩有棕闪斜煌斑岩、碱云煌岩,碱云斜煌岩、碱闪正煌岩、碱云闪斜煌斑岩、碱云闪正煌岩,这些碱性煌斑岩均以具含钛暗色矿物为特征。钙碱性煌斑岩主要有闪斜煌斑岩、角闪正煌岩,暗色矿物含钛极少或不含钛。本区煌斑岩受地壳的同化混染的影响不大,基本上为原生岩浆。本区无钾镁煌斑岩。
Most of lamprophyres in Laiyuan and Fuping are alkali lamprophyres. They mainly consist of camptonite, alkaliminette, alkali-kersantite, alkali-vogesite and transition types of them. The main mafic minerals in alkali lamprophyres are kaersutite, biotite, Ti-bearing diopside as well as a few altered olivine, and the felsic minerals are mainly plagioclase and alkali-feldspar. The calc-alkali lamprophyres are mainly consisted of non-titanium mafic minerals (such as hornblende, diopside) and two kinds of feldspar. The two series of lamprophyres can be distinguished by the following major marks: the alkali lamprophyres have SiO_2<46％ or F≥5％ or TiO_2>1.5％, and in contrast, calc-alkali lamprohyres have SiO_2≥46％ or F<5％ or TiO_2<1.5％. The lamprohyre magma in this area may have been less or not contaminated with the crustal rocks. The calcite in alkali lamprophyres may be the primary minerals.
出处
《岩石矿物学杂志》
CAS
CSCD
1989年第1期12-24,共13页
Acta Petrologica et Mineralogica
关键词
岩石学
煌斑岩
alkaline lamprophyres
calc-alkaline lamprophyres
lamproits
