论文部分内容阅读
本文根据陈国达教授创立的地洼学说,对云南西部地区的大地构造和铀矿化特征作了初步讨论。依据本区沉积建造、岩浆建造和构造特征:本区地壳构造可划分为西部的腾冲地洼系,转入地台时间早,间隔时间长;东部保山—澜沧地穹系和普洱地洼系,转入地台时间晚,地台阶段经历时间晚;但地处边缘的保山—镇康地穹列,地质特点可能有某些过渡性质,根据激烈期出现的时间,它们属于晚华夏或中亚期地洼。西部腾冲地洼系类似于华夏型的闽—浙式地洼;东部普洱地洼系类似于中亚型地洼。 该区铀成矿作用特征表明,铀主要在地洼期内形成工业矿床。新第三纪盆地中多因复成铀矿床很重要。铀矿床的形成受盆地基底花岗岩、南北向区域性控盆断裂、暗色含煤碎屑建造、多次冷水或(和)热水改造等因素控制。地洼阶段的发展历史对铀矿床形成有重要影响。 最后,在总结本区地洼构造和铀矿化基础上,进而与我国的东南地洼区及北疆地洼区的活化特征和铀矿化做了对比。表明本区无论在地洼特征上,还是成矿作用上与后两个地洼区不同,可能具过渡特征。
Based on Diwa theory founded by Professor Chen Guoda, this paper makes a preliminary discussion on the tectonics and uranium mineralization features in western Yunnan. Based on the sedimentary and magmatic construction and tectonic features in this area, the crustal structure of this area can be divided into the depression of Tengchongdi in the west and the time of turning into the platform is long and the interval time is long. The eastern Baoshan-Lancang Earth dome and Pu’erdi depression , The land transferred to the platform late, the platform stage experienced late; but located in the edge of the Baoshan - Town Hong ground domes, geological characteristics may have some transitional nature, according to the time of intense period, they belong to late summer or middle Asia depression. The western Tengchong depression depression is similar to the Huaxia type Fujian-Zhejiang type depression; the eastern Pu’er depression depression is similar to the Central Asia type depression. The characteristics of uranium mineralization in this area indicate that uranium mainly forms industrial deposits during the depression period. The multi-cause uranium deposit in the Neogene basin is very important. The formation of uranium deposits is controlled by such factors as basement granite in the basin, regional basin-controlled basin faults in the north and south direction, construction of dark-colored coal-bearing debris, multiple cold water or (and) hot water alteration. The development history of the Diwa stage has an important influence on the formation of uranium deposits. Finally, on the basis of summarizing the structure and uranium mineralization of Diwa in this area, it is contrasted with the activation characteristics and uranium mineralization of the Diwand and the Northern Terrain in the southeast of China. It shows that the area may be transitional in either the depression or the mineralization and the latter two depression areas.