| 安徽金寨沙坪沟矿区地应力测量与现今应力场研究 |
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| 关键词:Shapinggou molybdenum deposit in-situ stress hydraulic fracturing present-day stress field Column frictional failure criterion |
| 基金项目:深部探测技术与实验研究专项(编号: Sinoprobe-06-03); 中国地质调查局地质矿产调查专项项目(编号: 1212011220122); 中国地质科学院地质力学研究所基本科研业务费项目(编号: DZLXJK201404) |
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| Estimation on In-situ Stress Measurements and Present-day Stress Field in the Shapinggou Molybdenum Deposit, Jinzhai County, Anhui Province |
| The Shapinggou molybdenum deposit located in the East Qinling-Dabie metallogenic belt is a superlarge porphyry molybdenum deposit discovered in recent years. Much attention has been paid to the exploitation designing and geological safety evaluation of this deposit. To thoroughly understand the present-day stress field in the Shapinggou molybdenum deposit and put forward suggestions for the exploitation designing, the authors conducted in-situ stress measurement using hydraulic fracturing method in three drill holes at the depths of 700~1000 m in the Shapinggou molybdenum ore district. The measurement results reveal that the grade coefficients of the maximum, minimum horizontal principal stresses versus depths are 0.0226 and 0.0166, respectively, which are consistent with previous results representing the regional tectonic stress field. The measured in-situ stress data also indicate that the dominant direction of the maximum horizontal stress in the Shapinggou molybdenum ore district is in NE?NEE direction, which is consistent with the regional tectonic stress field. However, the stress regimes inferred from the measured in-situ stress data are not consistent with regional results inferred from other methods. The unique tectonic location and the tectonic evolution mechanism of the Tongbai-Dabie tectonic belt where the Shapinggou molybdenum deposit occurs are considered to be the main factors inducing the discrepancy between the Shapinggou molybdenum deposit and the regional results. Furthermore, the measured in-situ stress data and their implications for the exploitation designing of the Shapinggou molybdenum deposit were estimated by using the Column frictional failure criterion. It is noted that the measured in-situ stress levels in the ore district are lower than those expected to induce the stress field adjustment in the form of fault slipping or earthquake, and thus the Shapinggou molybdenum deposit can be considered to be in the relatively stable tectonic stress state now. The results achieved in this study will contribute to exploitation of the Shapinggou molybdenum deposit and geological safety evaluation as well as to the study of tectonic stress field of the Dabieshan orogenic belt. |
| QIN Xiang-hui,CHEN Qun-ce,HAO Yue-jin,MENG Wen,SUN Dong-sheng.2016.Estimation on In-situ Stress Measurements and Present-day Stress Field in the Shapinggou Molybdenum Deposit, Jinzhai County, Anhui Province[J].Acta Geoscientica Sinica,37(2):223-231. |
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