| 浙江五部铅锌矿床中银分布规律的初步探讨 |
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| 引用本文： | 郑人来,谢从智.浙江五部铅锌矿床中银分布规律的初步探讨[J].矿床地质,1984,3(1):19-26. |
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| 作者姓名： | 郑人来 谢从智 |
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| 作者单位： | 浙江地质科学研究所，浙江地质局第五地质大队 |
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| 摘 要： | 多金属矿床中的伴生银,是银矿床重要成因类型之一。浙江五部铅锌矿床中的伴生银,虽品位低,变化大,但分布较普遍。作者在对该矿床成矿规律的研究中,发现银在矿床中的分布有一定规律。本文拟着重对北矿段一、四号矿体中银的分布规律作一初步探讨。一、矿床地质概况矿床赋存于晚侏罗世至早白垩世之“火山断陷盆地”边缘断裂破碎带部位。盆地历经长期火山活动的喷发和堆积,形成了一套以酸性火山碎屑岩为主体的火山碎屑沉积岩、中一基性熔岩以及较晚期的酸性次火山岩,组成多旋回结构的“断陷火山建造”。矿床与多旋回火
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A preliminary study of the distribution of silver in the Wubu Pb-Zn deposit, Zhejiang Province |
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| Abstract: | Silver occurs as an associated element in the Wubu Pb-Zn deposit. In spite of its poor and extremely variable grade (ranging from 2 g/t to 231 g/t with a few even reaching 800 g/t), this element is widely distributed and is fairly large in amount, being characterized by relative concentration of high content at shallow depths. From about 400 m level upward its grade rapidly increase, varying in considerably wide limits; below this level the grade decreases and tend to be comparatively stable. Thus, stable on the whole while intensely variable in certain parts seem to be the character of distribution of silver in this deposit. Silver is present in two forms: 1) individual silver minerals, such as electrum, argentite, arsenopoly basite and native silver, either scattered in crystals of metallic sulfides or, more dominantly, infilling the cracks and cleavages of the sulfide minerals; 2) isomorphous mixtures existing chiefly in galena and to a less amount, in sphalerite, pyrite, etc. The latter claim has been substantiated by electron probe-scanning and X-ray diffiaction studies. Individual silver minerals seem to concentrate in the upper part of the deposit, thus resulting in the gradual increase in total assigning ratio of silver in sulfides with the depth. An investigation of the regularity governing the variation of silver content would undoubtedly furnish information on the extent of erosion of the deposit. |
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