| 拉分盆地三维演化初探——以新疆富蕴断裂拉分盆地为例 |
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| 关键词:pull-apart basin differential global positioning system detachment depth three-dimensional evolution features |
| 基金项目:中国冶金地质总局风险勘查项目“西天山成矿规律研究”(编号: FX【2009】-02) |
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| Three-Dimensional Evolution Features of the Pull-Apart Basin: A Case Study of Fuyun Fault |
| The pull-apart basin formed around the steps of the strike-slip fault refers to a low terrain area due to tensile force from the fault. The study of pull-apart basins especially the ones occurring along the large-scale strike-slip faults not only plays an important role in the research on strike-slip fault’s expansion and segmentation but also has some significance in the prediction of impending earthquake along the fault. Besides, these basins usually provide space for the migration, accumulation and production of oil, gas and mineral resources. The authors summarized the geometric and geomorphologic features of the evolution of the pull-apart basin based on previous research results, and chose a small pull-apart basin along the Fuyun fault to study its geometric and geomorphologic characteristics. Based on the survey using the differential global positioning system (DGPS) measurement instruments——SOUTH 9600 Polaris and data processing using SOUTH GPS and SOUTH CASS7.0 software, the authors constructed the contour pattern of the basin. Then, according to the model which explains the offsetting and sinking change of the pull-apart basin before and after the earthquake, the authors calculated the depth of its detachment, which turns out to be about 40 m below the surface. On such a basis, the relationship between the pull-apart’s horizon offset and vertical sinking is concluded, and the three-dimensional evolution features of the pull-apart basin are deduced. |
| ZHANG Zhi-wu,FU Bi-hong,Yasuo Awata,ZHOU Shang-guo.2011.Three-Dimensional Evolution Features of the Pull-Apart Basin: A Case Study of Fuyun Fault[J].Acta Geoscientica Sinica,32(2):251-256. |
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