论文部分内容阅读
砂金富集规律可归纳为五条:(1)砂金比重大,体积小,一般下沉于砂砾层底部基岩之上,形成富矿带。(2)河流流速减缓处是砂金富集之场所,如河流内湾处;两河会流处;河谷由宽突变窄处;河谷由窄突变宽处。(3)河床起伏不平是砂金富集之主要条件。最理想的河床是软硬相间之岩层,如砂页岩互层,且走向横穿河谷,倾斜较陡,这样,便形成具有无数隔梁与隔槽的起伏不平的河床,砂金受阻,易于停积。(4)位于谷旁之古老河床沉积阶地是无水患的易采砂金矿床,不容忽视。(5)红黄杂色铁砂及石英碎屑常为砂金富集标志。
The law of enrichment of gold can be summarized as five: (1) The proportion of the gold is large and the volume is small, generally sinking above the bedrock at the bottom of the gravel layer to form a rich ore belt. (2) The slowing down of river flow velocity is the place where the gold is enriched, such as the inner bay of the river; the meeting place of the two rivers; the narrow valley of the river valley; the narrow valley of the river valley. (3) undulating river bed is the main conditions of enrichment of gold. The most ideal river bed is between the soft and hard rocks, such as interbedded sand and shale, and to cross the valley, the gradient is steep, so that there will be numerous bay and Undulating Undulated River bed, gold-plated obstruction, easy to stop product. (4) Located in the valley next to the ancient riverbed sedimentary terrace is easy to mining gold-bearing gold deposits, can not be ignored. (5) red and yellow variegated iron ore and quartz crumbs are often gold enrichment signs.