CRETACEOUS DEFORMATION HISTORY DETERMINED BY RESTORATION OF THE BALANCED SECTION ACROSS THE LANPING-JINDING REGION, YUNNAN, CHINA
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摘要: 兰坪盆地为中新生代陆内盆地, 地处欧亚板块与印度板块的拼合带, 其中兰坪金顶地区白垩系发育, 很好地记录了该区的区域构造运动特征。通过野外实测和室内资料整理, 在兰坪金顶地区选择一条北西—南东向地质剖面, 用平衡剖面技术恢复研究区白垩系因欧亚板块与印度板块碰撞而引起的北西—南东向地层缩短量, 揭示盆地的性质及变形历史, 检验其地质构造解释的正确合理性, 并进行数字化分析。研究结果表明, 白垩系景星组下段至南新组沉积期间地层总缩短量为2.938 km, 在南新组构造活动最为强烈。Abstract: The Nanping Basin, located between the India and Eurasian plates, was a large Mesozoic-Cenozoic basin and deposited huge thick continuous Cretaceous strata, which recorded well the regional tectonic movement characteristics. Based on field survey and indoor data sorting, a technique of balanced section across the Lanping-Jinding region was applied to a NW-SN geological profile to reconstruct the crust shortening history from Cretaceous and to understand the nature of the basin and to check up its geological structure explained correctly and to make a digital analysis. The results showed that the total length about the Cretaceous crust shortening was 2.938 km from the under section of Jingxing Formation to Nanxin Formation, and Nanxin Formation had the most strongest tectonic movement.
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Key words:
- Lanping-Jinding region /
- Cretaceous /
- shortening length /
- technique of balanced section
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图 3 兰坪金顶地区北西－南东向平衡剖面恢复图
Figure 3. NW-SE balanced section across the Lanping-Jinding area
表 1 兰坪金顶地区北西—南东向平衡剖面白垩系地层缩短特征
Table 1. The Cretaceous strata shortening character from a NW-SE profile in the Lanping-Jinding area
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