滇中及邻区大地构造演化─运动特征

来源 :中南工业大学学报(自然科学版) | 被引量 : 0次 | 上传用户:dna_cc
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滇中及其邻区的大地构造演化运动经历了原陆壳活动阶段、原陆壳“稳定”阶段、地槽、地台和地洼5个阶段,留下了相应的构造层.前地槽构造层包括活动和稳定2种类型,具有面状分布的特征,代表陆壳演化初期刚性较低的地壳特点.地槽构造层以大红山群、昆阳群和澄江组为代表,但邻区出现分异现象.地台构造层的特征表明最迟在寒武纪,本区壳体接合成为一个稳定的整体,但从奥陶纪开始古地台边缘出现陆缘扩张现象,形成局部扩张槽.地洼阶段具有中亚壳体和东亚壳体过渡性特点,地洼阶段开始的时间与东亚壳体的相同,而激烈期时间与中亚壳体的相同.通过构造层特征的分析,认为滇中及其邻区壳体成长经历了接合、同化、分异、同化的过程. The tectonic evolution-movement of the Central Yunnan and its adjacent areas underwent five stages of the original continental crust movement, the “stable” stage of the continental crust, the earth trough, the platform and the depression, leaving the corresponding structural layers. The former Trench Tectonics consists of two types of activity and stability with planar distribution, representing the lower rigid crustal features in the early evolution of the continental crust. Tectonic trenches are represented by Dahongshan group, Kunyang group and Chengjiang group, but the differentiation phenomenon appears in the neighboring area. The characteristics of the tectonic tectonic layer indicate that at the latest during the Cambrian period, the shell joints in the area became a stable whole. However, the marginal expansion occurred on the margin of the ancient terraces from the Ordovician to form a local expansion trench. The Diwa stage has the transitional characteristics of the Central Asian and East Asian shells. The Diwa stage begins at the same time as the East Asian shell, while the intense period corresponds to the Central Asian shell. Based on the analysis of tectonic features, it is concluded that the shell growth in Central Yunnan and its adjacent areas underwent the processes of conjugation, assimilation, differentiation and assimilation.
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