GEODYNAMIC SETTING SINCE THE CENOZOIC AND ITS ENVIRONMENTAL EFFECTS IN NORTHWEST YUNNAN, CHINA
GEODYNAMIC SETTING SINCE THE CENOZOIC AND ITS ENVIRONMENTAL EFFECTS IN NORTHWEST YUNNAN, CHINA
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发表时间：
1999
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通讯作者：
Li Feng
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作者：
Li Feng
详细分析了滇西北地区新生代以来，特别是第四纪以来的构造运动，发现滇西北地区的构造运动强度不断增强。各山脉构造抬升速率由全新世前的0.4~ 1.7mm/a变化为全新世以来的2.0~ 7.1mm/a，近代抬升速率达4~15 mm/a。全新世盆地的构造沉降速率比更新世增加了1~2个数量级。第四纪（如红河断裂带）沿断裂的位移速率沿着断裂不断加快。现今地壳应力值高，构造变形速率快，地震强度有明显的增加趋势，大地热流异常十分明显。上述构造运动的加剧将给滇西北地区带来一系列环境问题，如山地地貌格局和地质灾害恶化，区域湖泊加速收缩，区域地壳稳定性下降等。随之而来的是，人类面临着更加严酷的生存环境。
Based on the detailed analysis data, it is found that tectonic movement in northwest Yunnan has been growing in intensity since the Cenozoic, especially in the Quaternary. Tectonic uplifting rate of various mountains changed from 0.4～1.7 mm/a before the Holocene to 2.0～7.1 mm/a since the Holocene, and the recent uplifting rate reached 4～15 mm/a. Tectonic subsidence rate of basins has been increasing in the Holocene by up to 1～2 orders of magnitude, compared to that of the Pleistocene. Displacement rate along fractures in the Quaternary (for example Red River fracture zone) has been accelerating continuously. Present crustal stress values are high, structural deformation rate is fast, intensity of earthquake has an obvious increasing trend, and terrestrial heat flow anomaly is very obvious. The intensification of tectonic movement above will bring about a series of problems on environment in northwest Yunnan, such as the relief framework and geological disasters of mountain land will be worsen, lakes in the region will contract acceleratively, and regional crustal stability will decline. Subsequently, mankind is facing a harsher living environment.