论文部分内容阅读
五、镍矿床评价的基本原则如上所述,内成硫化铜镍矿床在成因上和空间上与典型的基性侵入体-苏长岩、辉岩、橄榄岩有关,很少与正常的辉长岩和辉长岩-辉绿岩有关.矿床与侵入岩是同生和后生的.矽酸镍矿床是由于超基性岩石,主要是蛇纹岩在炎热和湿润气候条件下,由于化学风化作用的结果形成的.就是说,这些矿床与超基性岩有着密切的关系.同时还必须指出,硫化铜镍矿床的时代永远是属于前寒武纪或下古生代,很少属于上古生代或中生代.矽酸镍矿床的形成中属于中生代或第三纪.必须指出,巨大的镍矿床在地台区范围分布,而其时代为前寒武纪-下古生代.
V. THE BASIC PRINCIPLES FOR THE EVALUATION OF THE NICKEL DEPOSIT As mentioned above, the intumescent Cu-Cu-Ni deposit is genetically and spatially related to the typical basic intrusions-soils, peridotites, peridotites, and rarely associated with normal gabbro and Gabbro-diabase. The deposit is co-occurring and epigenetic from intrusive rocks. The silico-nickel deposit is due to the chemical weathering of ultrabasic rocks, mainly serpentinite, in hot and humid climates That is to say, these deposits are closely related to ultramafic rocks, and it must also be pointed out that the age of copper sulphide-nickel deposits is always Precambrian or Paleozoic, rarely belonging to the Paleozoic or Mesozoic. The formation of nickel deposits belongs to the Mesozoic or Tertiary. It must be pointed out that the huge nickel deposits are distributed in the platform area, and the age is the Precambrian-Paleozoic.