摘要
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。
It was previously considered that all of the Pb-Zn deposits in the Xicheng orefield belong to Devonian hydrothermal-sedimentary deposits or their reworked ones. Study proves that the host strata, besides the Devonian, include the Lower Proterozoic. The ultra-large Changba-Liji-agou Pb-Zn deposit occurs in the Lower Proterozoic . -The deposits in this region are not hydrothermal-exhalation sedimentary deposits or their reworked ones, but Yanshanian-Himalayan epigenetic-hydrothermal deposits. The occurrence characteristics, size and position of all the deposits in the Xicheng orefield are completely controlled by the Choula (draw)-thrust sheet. Therefore the previous grounds for the model of the Qinling-type Pb-Zn deposits cannot hold good. The writers propose to use Changba-type and Bijiashan-type Pb-Zn deposits to represent the two deposit models with different characteristics which are large in size and of great economic values in the Xicheng orefield.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1997年第4期360-366,共7页
Acta Geologica Sinica
基金
国家
地矿部科技攻关
行业基金
国家自然科学基金
关键词
矿床模式
岩片构造
铅锌矿床
后生成因
deposit models, choula (draw)-thrust sheet, Changba-type , Bijiashan-type, Xicheng orefield
