论文部分内容阅读
米士(1942)将滇中澄江组与昆阳群之间的不整合命名为晋宁运动,刘鸿允(1963)又提出以晋宁运动作为震旦系的底界,这些意见已被地质界所普遍采纳。但是,随着近年来对震旦系的深入研究,关于震旦系的底界年龄则提出了两种基本不同的意见:一种仍坚持以晋宁运动不整合面为震旦系下界的标志,提出其年龄大致在9亿年左右(刘鸿允等,1980);另一种采纳以冰川作用为起点的意见,将震旦系的下界划在长安组的底部,同意其时代大至在8亿年左右(杨暹和等,1981)。滇中是云南震旦系发育完全的地区,也是晋宁动运的发源地。但是,过去对晋宁运
Mishi (1942) named the unconformity between the Chengjiang Formation and the Kunyang Group in central Yunnan as the Jinning Movement. Liu Hongyun (1963) proposed to use the Jinning movement as the bottom line for the Sinian system. These opinions have been used by the geological community Generally accepted. However, with the in-depth study of the Sinian in recent years, two basic different opinions have been put forward regarding the age of the bottom of the Sinian: a sign that still insists that the unconformity of the Jinning movement is the lower bound of the Sinian , Proposed that its age is about 900 million years (Liu Hongyun et al., 1980); another adopted the opinion of the glacier as a starting point, the lower bound of the Sinian lines drawn at the bottom of the Chang’an Formation, agreed that its era as large as 800 million Year or so (Yang and Si, et al., 1981). Yunnan is the complete development of Yunnan Sinian, but also the birthplace of Jinning. However, the past Jinning Yun