摘要
响山碱性花岗岩晶洞中生长着一种罕见的蓝色石棉,该矿物系铁-亚铁蓝透闪石。微区组成研究揭示了该闪石是由铁-红闪石—铁-亚铁冻蓝闪石生长演化而来,对它进行了红外吸收谱,X射线结构分析和差热性质的研究,并确定了岩石中还存在另外三种闪石,即铁-浅闪石、亚铁钠闪石和铁-阳起石。上述所有矿物都以铁含量高为特征。
A scarce blue-coloured asbestos developed in miarolitic cavities of the Xiangshan alkali granite has been identified to be ferro-ferri-winchite. Data about its optical properties, EPMA, infrared spectrum, X-ray powder diffraction and DTA, TG curves are given. Other four species of amphibole——ferroedenite, ferri-katophorite, ferro-ferri-barroisite and ferro-actinolite also have been discovered in a greyish-white granite in addition to winchite, but in red granite there is only arfvedsonite. Although they fall into three different groups, alkalic, sodic-calcic and calcic amphiboles, they are all characterized by high iron contents. From early to late, along with the magma evolution, the amphiboles in the greyish-white rock crystallized in order of edenite→katophorite→barroisite→winchite, with SiO_2, FeO and Na_2O increasing but Al_2O_3, MgO and CaO decreasing progressively. They might be formed in a late magmatic stage underreducing conditions with lower temperature and pressure. Actinolite seems to be the latest phase.
出处
《矿物学报》
CAS
CSCD
北大核心
1989年第3期193-201,共9页
Acta Mineralogica Sinica
基金
中国科学院院长基金
关键词
花岗岩
晶洞
蓝色石棉
ferro-ferri-winchite
alkali granite
hornblende
miarolitic cavity
Hebei
