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大吉山花岗岩人工重砂中的宇宙尘呈黑色,具强磁性,平均粒径为0.206mm,按形态可分为球状、椭球状和不规则状,按成分可分为铁质和硅酸质两种类型。主要矿物有方铁矿、α-Fe、自然铜、钠长石和钾长石。主要组构类型有瘤状突起构造、喷气孔构造、“毛刺”构造、壳层构造、空腔构造、花边构造和脑纹状构造。通过研究得出如下结论:(1)大吉山宇宙尘是低氧逸度条件下高温淬火形成的非平衡结晶产物;(2)宇宙尘的来源与大吉山花岗岩的成因有密切联系,是花岗岩岩源层的残留物;(3)宇宙尘可以作为花岗岩成因指示物。
The cosmic dust in the artificial sand of Dayishan Granite is black with a strong magnetic property and the average particle size is 0.206mm. It can be divided into spherical, ellipsoid and irregular shape according to the morphology, and can be divided into iron and silicate two Kind of type The main minerals are siderite, α-Fe, natural copper, albite and potassium feldspar. The main types of structures are nodular protuberances, jet holes, burr structures, shell structures, cavity structures, lace structures and brain striated structures. The conclusions are as follows: (1) Dajishan cosmic dust is an unbalanced crystallization product formed by high temperature quenching under low oxygen fugacity; (2) The origin of cosmic dust is closely related to the genesis of the Dajishan granite, Source of the residue; (3) Cosmic dust can be used as an indicator of the origin of granite.