DONGCHUAN MOVEMENT AND ITS INFLUENCE ON FOLDING STRUCTURES IN DONGCHUAN MINING DISTRICT
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摘要: 分析了当前东川运动的各种认识,通过上下地层的特征、构造、变质作用、火山-岩浆活动、形成背景以及汤丹、落雪和拖布卡3个典型剖面的研究,确定该运动是一次大规模的构造运动。东川运动是南北向挤压运动,在东川矿区下(昆阳)亚群形成东西向褶皱构造,被后期小黑箐和晋宁运动叠加改造后,其构造形迹变得模糊和复杂,但经仔细研究分辨出了10个较大的褶皱构造。Abstract: The various understandings about Dongchuan Movement were analyzed. Researches on characteristics of the strata in Kunyang Group, metamorphism, volcano-magma activities, and typical profiles as Tangdan, Luoxue and Tuobuka show that Dongchuan Movement is a large-scale tectonic movement. Dongchuan Movement is SN-trend compressional movement. In Dongchuan mining district, EW-trend fold structures formed in the lower Kunyang subgroup. These EW-trend fold structures were reformed and transformed by later Xiaoheijing Movement and Jinning Movement. The structural features became indistinct and complex. But after a careful study, the 10 larger fold structures were distinguished in Dongchuan mining district.
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Key words:
- Dongchuan Movement /
- folding structure /
- Kunyang Group /
- Dongchuan mining district
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图 2 因民组(Pt2ky)与平顶山组(Pt1kp)不整合接触(据文献[11]修改)
Figure 2. Unconformable contact of Yinmin Formation and Pingdingshan Formation
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