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一、概述驰名中外的湘黔汞矿带,由数十个具有一定层位的层控矿床组成。大硐喇汞矿田位于湘黔汞矿带中段,已知工业矿体皆产于寒武系中统敖溪组第五岩性段(∈_(2a)~5)细粒结晶白云岩中。矿田内各矿床主要受北西西向褶曲控制,多沿褶曲长轴方向展布,并因汞矿在含矿层中产出部位不同,而有“顶部矿”与“中下部矿”之分。含矿层的上覆及下伏岩层泥质含量高于含矿
I. Overview Hunan and Guizhou at home and abroad famous mercury ore belt, composed of dozens of strata deposit with a certain level. The Datong Hg ore field is located in the middle of the Hunan-Guizhou mercury zone. It is known that industrial orebodies are all produced in fine-grained crystalline dolomite of the fifth lithologic section (∈_ (2a) ~ 5) of the Aoxi Formation in the Central Cambrian . The ore deposits in the orefield are mainly controlled by the NW-Westerly folds and are mostly distributed along the long axis of the fold. Because of the different production sites of the mercury deposits in the ore-bearing layers, there are “top mines” and “middle and bottom mines”. The overburden and underburden of the ore-bearing layers are higher than the ore-bearing ones