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自从地球上出现生物以来,就不同程度地影响着金属的成矿作用,对化学性质十分稳定的金也是如此。人们在闻名世界的南非兰德金矿中发现,细小的金粒外面具生物的遗迹。经研究,证实了这些生物遗迹的成分与现代藻类中的氨基酸和碳水化合物相似。它们是具有纤维网状结构的真菌,表面好象毛毯。当真菌遇到呈游离状态的微细金时,“毛毯”的凹陷部位就成了金的藏身之处。真菌可分泌出有机酸把金包裹起来,使之不再散失。这种生物对金的富集作用可以解释一些令人费解的成矿现象。比如,巴西里约州有一个关闭了的砂金矿,开采时的原矿品位为11.6克/米~3,选矿后的尾砂品位为0.7克/米~3,十年后经过化验,金品位回升到4.66克/米~3。专家们认为,金的再生现象与微生物的活动有一定联系。
Metallogenesis has been affected to varying degrees since the appearance of living things on Earth, as has also been the case with chemically stable gold. People in the world-renowned South African Rand gold found that small gold particles outside the biological relics. Studies have confirmed that the composition of these biological relics is similar to amino acids and carbohydrates in modern algae. They are fungi that have a fibrous network structure that looks like a blanket. When the fungus encounters the free gold, the hollows of the “blanket” become gold hiding place. The fungus can secrete organic acids to wrap the gold so that it no longer loses it. The biological enrichment of gold can explain some puzzling mineralization. For example, Rio de Janeiro, Brazil has a closed gold and gold mine, mining ore grade is 11.6 g / m ~ 3, after tailings dressing grade 0.7 g / m ~ 3, after ten years of testing, gold grade Recover to 4.66 g / m ~ 3. Experts believe that there is a certain connection between the regeneration of gold and the activity of microorganisms.