摘要
该文对岩管中各类岩石(金伯利角砾岩、含岩球—粗碎屑斑状金云母金伯利岩、斑状镁铝榴石金伯利岩、细粒金伯利岩)特征、分布及相互关系的宏观现象,结合镜下微观现象的研究,证实该岩管金伯利岩岩浆具多次脉动(三个相四次侵入)的特点。根据岩管的产状近直立、金刚石晶体保存完好、岩石呈卵斑结构和流动构造及围岩未受爆破影响等特征,认为该岩管应是浅成—超浅成侵入形成的。橄榄石的卵斑多(>50％)、富含深紫色的镁铝榴石、富含铬铁矿及深源捕虏体数量多、种类多的金伯利岩,则富含金刚石。
According to the Study of the characteristics, the spacial distribution as well as the mutual relationships of megascopic phenomena about numerous kinds of rocks (such as kimberlite breccia, coarse ball—fragments bearing porphyritic phiogopite kimberlite, porphyritic pyrope kimberlite and also fine—grained kimberlite, and in combination with microscopic examination about the mierofeatures),it is full proof that the magma of the kimberlite of this pipe behaves as multiple pulsation marked by three facies and four -times intrusion. In the light of the nearly upright occurrence of the pipe, the well preserved diamond crystals, the ovaloid porphyritic feature and the flow structure of the rocks as well as the unaffected country rock by explosion, it is belived that this kimberlite pipe ought to be formed by a-hypabyssal—ultrahypabyssal intrusion. The diamond—riched kimberlite is marked by a large amount of ovaloid olivine phenocrysts (well over 50％),rich darl—purpled pyropes, a-bundant chromites as well as Lots of a great variety of deep—seated xeno- liths.
出处
《石家庄经济学院学报》
1985年第2期1-9,1-2,共11页
Journal of Shijiazhuang University of Economics
