A Study of the Rake, Pitch, Rich Ore Pillar Controlled by Tectonic Stress Field in the Principal Metallogenic Epoch and the Estimation of Metallogenetic Depth of Xincheng Gold Deposits
详细信息
- 责任者：Li Junying (Xincheng Gold Deposits ; Shandong Gold Group Co. ; Laizhou 261438 ; China) ; Guo Tao
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(4)
- 关键词：金矿 ; gold ores ; 构造应力场 ; tectonic stress field ; 山东 ; Shandong Province
- 页码：p.312-319
- 图表：illus., 3 tables, 31 refs.
- 分类号：1001
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The study of tectonic stress field is the basis for the understanding of ore-controlled structure,ore body’s spatial distribution and forecasting.According to the elastic mechanics and Mohr-Coulomb shear failure theories,the tectonic stress field conditions giving rise to the conjugation,feather-echelon and en-echelon structures were figured out and thus a mathematical analysis method for calculating the parameters needed in forming the above structures was proposed.This method was applied to the Jiaojia-type Xincheng gold deposit,and the result shows that the main structure hosting the ore bodies in this deposit occurred in a right-twisting structural plane,suffering NNW trending low-angle extensional stress coupled with NE trending high-angle compressive stress.The NWW trending intermediate principal stress that controlled the occurrence of the plunge and lateral trending of the No.I orebody pitches to the direction of NW281° with the angle of pitch of 26° on the horizontal projection,however it pitches to the SW direction with the angle of 45° on the N40°E direction projection.On the basis of the occurrence of host structure and the test results of rock mechanical properties,the authors have built the mechanics relationship and formula between the feather-echelon and the shear structure.According to this formula,the maximum and the minimum principal stress have been solved and the upper limit of the mineralization depth is estimated to be about 2750 m.
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