摘要
川西四姑娘山中酸性岩体,具典型的上层前锋多阶段花岗岩特征。可分为前锋阶段变斑状云闪正长岩、主侵入阶段似斑状二长花岗岩、晚阶段细晶二长花岗岩、细晶钾长花岗岩、气化—伟晶岩、气化热液石英脉,它们按其顺序先后产出,其间关系明晰。有重要的钨、锡、钼及稀有稀土和多金属等矿产与之密切相关,共矿体的产出严格受构造裂隙控制。黑云角闪正长岩铁镁比值0.84,为非幔源型物质重熔体,并具有自前锋由交代型岩体至主侵入及其晚阶段的典型岩浆岩体的系列演化特征。岩体生成于印支晚期(195Ma)。
The multistage evolution of the Siguniang Mt.medium-acid complex is characterized in porphyro-blastic mica-amphibole-syenite (front stage ), porphyritic adamellite(main intrusive stage) and a big variety of late stage products including aplitic adamellite, kaligranite and pneumatolytic pegmatite and hydrothermal veins.W, Sn, Mo, REE and base metal mineralization is closely associated with the late stage products being strictly controlled by fractural structures.
Fe/Mg ratio of the mica-amphilole syenite is 0.84, representing an anatectic remelted crustal origin.
出处
《矿物岩石》
CAS
CSCD
1989年第1期66-75,共10页
Mineralogy and Petrology
