地质通报2017，Vol.36Issue(2)：199-208,10.
云南兰坪盆地古近系碎屑岩重矿物分布规律及其指示意义
Heavy mineral distribution regularity of Paleogene detrital rocks in Lanping basin, Yunnan Province
摘要
Abstract
The analytical results of 59 Paleogene sandstone samples from Lanping basin indicate that the average content of stable heavy minerals is 38.4%, the relatively stable and unstable minerals are very rare, respectively possessing 2.3% and 1.1%. The average content of the facies minerals hematite and limonite is high, possessing about 50.5%. According to stability coefficient, ZTR index, ATi index and the variation characteristics of heavy mineral index along the profile, the tectonic evolution is divided into two peri-ods: flat period and active period. The tectonic activities of different parts and periods of the basin show some differences; on the whole, the activity of south central basin was later than that of the north basin in time. The heavy mineral assemblage suggests that the Paleogene provenance had several kinds of rock styles, dominated by sedimentary rock, with minor basic rock, intermediate-acidic in-trusive rock and metamorphic rock. From east to west, the ZTR index decreases gradually. In combination with tectonic setting of the study area and previous research findings on the basement of the basin, the authors infer that, in Yunlong period, the provenance mainly came from the eastern margin of the basin, and the provenance of Guolang Group mainly came from the eastern margin of the basin, followed by the western margin. The facies of heavy mineral assemblage shows that the ancient sedimentary environment of Lanpin basin was a strong oxidation environment of swallow water.关键词
重矿物/物源分析/古近系/兰坪盆地Key words
heavy mineral/provenance analysis/Paleogene/Lanping basin分类
天文与地球科学引用本文复制引用
朱志军,郭福生..云南兰坪盆地古近系碎屑岩重矿物分布规律及其指示意义[J].地质通报,2017,36(2):199-208,10.基金项目
国家自然科学基金项目《滇西兰坪盆地蒸发岩系发育规律及盐构造解析》(批准号:41362008)和核资源与环境重点实验室开放基金项目《江西信江盆地白垩纪盐韵律及盐间粘土矿物的古环境恢复》(编号:NRE1506) （批准号:41362008）
