论文部分内容阅读
本文收集了各家材料,加上自己的一些观察,针对川西滇东地区前震旦系几个重要的地质问题,表示了自己的看法:(一)关于原大红山群老厂河组和原河口组下变质沉积岩段,认为是古陆壳的产物而不是地槽期的硬砂岩建造。川滇地区在河口组火山活动之前曾广泛发育过原始古陆壳;(二)关于河口组的层序,认为由于同斜褶皱使地层层序造成了假象,修正后不但能与元谋姜驿、新平大红山等地对比,而且可以恢复拉拉地区的褶皱面貌;(三)认为河口组和大红山群内存在不整合面,称之为“川滇运动”,老于19亿年,代表川滇地区最古老的一次地壳运动。会理群的双水井组与青龙山组间也存在不整合面,称之为“西昌运动”,距今13-14亿年,可以将会理群或昆阳群划为上、下两个亚群;(四)关于美党组与望厂组的层位问题,认为东川地区的望厂组应该是该地昆阳群的最上层位。
This article collected various materials, together with some of their own observations, expressed their views on the several important geological problems of the former Sinian in eastern Yunnan: (1) The Lower Cretaceous sub-metamorphic sedimentary rocks are considered to be products of paleo-continental crust rather than hard-rock formations during geosyncline. (2) Concerning the sequence of the estuary group, it is considered that the sequence of the stratigraphic sequence caused by the isochronism folds illegally, which not only can be used in conjunction with Jiangyi, Xinping Dahongshan and other places, and can restore the Lala area folds; (three) that there is an unconformity within the estuary group and Dahongshan group, called “Sichuan and Yunnan Movement”, older than 1.9 billion years, Represents the oldest crustal movement in Sichuan and Yunnan. There will also be an unconformity between Shuangshuijing and Qinglongshan formations in Huili Group, which is called “Xichang Movement”, dating from 13 to 1.4 billion years ago, and can be divided into upper and lower groups Sub-group; (4) Concerning the layer problem of the U.S. party group and Wangchang Group, it is believed that the Wangchang Group in Dongchuan should be the uppermost stage of the Kunyang Group.