- 责任者：Dang Yuan (School of Earth Sciences and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Chen Maohong
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(6)
- 关键词：银矿 ; silver ores ; 多金属矿 ; polymetallic ores ; 四川 ; Sichuan Province
- 页码：p.1077-1092
- 图表：8 illus., 2 tables, 27 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
The Gacun silver polymetallic deposit in Baiyu County of Sichuan Province is one of the most famous VHMS deposit in China, and previous researchers had conducted detailed studies of the deposit model. In order to explain the geological phenomenon that the lower vein ore body is roughly stratified and parallel to the upper massive ore body, the previous researchers proposed the model of ＂sheeted ore zone ＋ stratabound stockwork ore zone＂; nevertheless, the concept remains confusing and doubtful. The authors hold that, after the formation of the Gacun deposit in the Indosinian period, the deposit suffered strong Yanshanian reformation at the collision stage between the arc and the continent, which resulted in the uprightness and overturning of the strata in the deposit, and the rhyolitic volcanic rocks with weak competence were generally subjected to the intraformational ductile shear deformation. As a result, the lower and middle vein and the stockwork ore body which were originally vertical bedded ore body and exhalative sedimentary rock were transformed into tight fold, rootless fold lenticular in form and parallel to the upper bedded ore body. Structure restoration shows that the original 3D shape of the lower and middle vein and stockwork ore body was unconformably tubular or funnel-shaped, and combined with upper bedded ore body to form typical ＂lower tubular and upper stratiform structure＂ named ＂bilayer structure＂. On the basis of spatial distribution characteristics of the vein and stockwork ore body and the bedded ore body, and according to structure restoration, the authors reconstructed the two-channel clip brine pool deposit model of the Gacun VHMS deposit. The model has certain guiding significance for the prospecting work in the periphery of the ore deposit.