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以杰尔图拉克矿化特征为例研究了阿穆尔河流域碳酸盐岩中金的成矿作用,并将碳酸盐围岩和矿石与美国内华达州卡林金矿床进行了地球化学和岩石化学的比较分析.查明了含有粘土-水云母(K、Al)组分及多种成矿元素的白云岩的矿化富集趋势.矿体为条带状或角砾状白云岩,它具有脉状金-多金属、透镜状金-磁铁矿-磁黄铁矿及浸染状金-黄铁矿-毒砂等矿化.矿化在碳酸盐岩层剖面中占据一定的层位.矿石特征是金以不同粒度的、成色高的游离金存在,并与辰砂共生.杰尔图拉克矿床金-黄铁矿-毒砂成矿作用与卡林型金矿床相似,特别是与乌拉尔的沃龙佐夫矿床碳酸盐岩金矿石相似.总结了阿穆尔河流域碳酸盐岩地层中金矿的找矿远景. 相似文献
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The orientation of nonspherical cosmic dust grains is found in the anisotropic corpuscular or radiation fluxes and in the presence of the magnetic field; the grains being approximated by the axially-symmetrical ellipsoids. The comparatively small twisting is shown to cause the difference in scattering of the right and left circular-polarized light and the increasing of the angular momentum. If the period of the angular momentum precession caused by the magnetic field is less than the time of the orientation by the corpuscular or radiation fluxes, then the distribution of the grains' axes gets the symmetry relative to the field direction. It is shown that such orientation realized in our Galaxy allows us to explain easily the interstellar linear polarization observed. The mechanisms of the grains' orientation near the infrared source Becklin-Neugebauer, in the B 96 cloud near RY Tau and in the comet Bennett are discussed. 相似文献
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И. Н. Топтыгин 《Astrophysics and Space Science》1973,20(2):329-350
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