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在选擇花崗偉晶岩脈地質测量比例尺之前,必须掌握花崗偉晶岩脈的空间分佈规律。花崗偉晶岩脈类型矿床的主要特征之一,是偉晶岩脈分佈密集,它們往往是成羣成組的出现,而一羣一组的偉晶岩脈就常数以千、百計。圍岩常为变質强烈的岩石(片麻岩,混合岩,貫入片麻岩,結晶片岩等)。岩脈多分佈于母岩侵入体的內外接触带中,一般离母体不超过二公里。因此在空间分佈上,花崗偉晶岩脈圍繞着侵入体形成一个个独立的矿田。在同一構造單元中,同期侵入体所形成的矿田,分佈面积可由数百半方公里到数万平方公里,我們称之为花崗偉晶岩脈分佈
Before choosing the geological measurement scale of granitic pegmatite veins, we must master the spatial distribution regularity of granite pegmatite veins. One of the main features of the granitic pegmatite-type deposits is that the pegmatites are densely distributed and often occur in groups. Pegmatites of a group and a group of tens thousand are often constant. Surrounding rocks are often metamorphic rocks (gneiss, mixed rock, penetrating gneiss, crystalline schist, etc.). Dikes are mostly distributed in the inner and outer contact zones of the parent rock intrusions, generally no more than two kilometers away from the mother. Therefore, in the spatial distribution, the granitic pegmatites formed an independent ore field around the invaded body. In the same tectonic unit, the ore field formed by contemporaneous intrusions can be distributed in an area of hundreds of square kilometers to tens of thousands of square kilometers, and we call it the distribution of granitic pegmatites