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- Title
张家口北部铅锌银多金属矿床区域剥蚀程度分析.
- Authors
李随民; 焦雪红; 郝花金; 韩腾飞; 孙志伟; 李 宾; 李紫烨; 邢 欢; 韩玉丑
- Abstract
The northern part of Zhangjiakou area is an important area with Pb-Zn-Ag polymetallic deposits in Hebei Province. Because the mineralization process and ore-controlling factors of polymetallic deposits are similar in this area, the mineralization should be related to the Yanshanian acid small rock body that invaded the metamorphic rocks under the volcanic cover, so that the geochemical anomalies can be compared. Geochemical anomalies have overall unbiased characteristics to the position of the polymetallic ore deposit, factor analysis of geochemical surveying data shows that correlation of the ore-forming elements does not change from primary halos in stream sediments, and hence researchers can use primary halos of these elements to distinguish the denudation degree of the orebody so as to analyze regional denudation extent of the polymetallic deposit. With the Caijiayin polymetallic deposit as an example, the authors investigated the parameter of (Bi+V+Ba)/(B+Sb+U) and (U/Th) ratios which can effectively identify the denudation extent. The results of geochemical surveying data analysis indicates that the polymetallic deposits are widely distributed all over the study areas which have different degrees of denudation. The cumulative NAP method shows that the denudation degree of the Lanyan polymetallic deposit is the highest and that of Caijiaying and Qingyanggou deposit is significantly reduced. The polymetallic deposits are mostly distributed in the area of metamorphic crystal basement and its periphery where there exists high degree of rock weathering. As the weathering degree of the rocks of volcanic rock cover area is low, the polymetallic deposits which lie in the underlying metamorphic rocks are mostly distributed in the concealed to semi-concealed state, these areas should be the new targets in search for polymetallic deposits.
- Publication
Acta Geoscientica Sinica, 2021, Vol 42, Issue 4, p537
- ISSN
1006-3021
- Publication type
Article
- DOI
10.3975/cagsb.2020.082801