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以往资料认为西成矿田的铅锌矿床均属泥盆纪热水—喷流沉积或它们的改造型矿床。经笔者研究证实,西成矿田容矿地层除泥盆系外,还有古元古界。超大型厂坝—李家沟矿床产于古元古界地层中。该区矿床不是热水—喷流沉积型或其改造型矿床,而是燕山—喜马拉雅期的后生热液矿床。西成矿田中所有矿床的产出特征、规模和部位完全受抽拉—逆冲岩片构造的控制。为此,原秦岭式或秦岭型铅锌矿床模式的基础已不成立,建议用厂坝式、毕家山式等名称代表西成矿田中两类规模大、经济价值高、特征不同的矿床模式。
Previous data suggest that the lead-zinc deposits in the West Minerals are all Devonian hot water-jet deposits or their remolded deposits. The author studies confirmed that the West into the ore-bearing strata in addition to Devonian, there are ancient Proterozoic. Super large dam - Lijiagou deposit was produced in Palaeozoic strata. The deposit is not a hot water-jet deposition type or its remnant deposit, but a Yanshan-Himalayan epithermal deposit. The output characteristics, scale and location of all the ore deposits in the Xicheng ore field are completely controlled by the structure of the drawing-thrust lithofacies. For this reason, the foundation of the original Qinling-type or Qinling-type lead-zinc deposit has not been established. It is suggested that the two types of ore deposits with large scale, high economic value and different characteristics in the West ore field should be represented by the dam-type and Bijianshan-style names.