摘要
根据国际、国内新近作出的对元古宙年代地层单位划分方案,本文对康滇地轴区完好发育的元古宙地层,在已取得的研究程度的基础上,认为只要对昆阳群(会理群)和震旦系的层序、时代、顶底及造成不整合界面的几个地质事件取得共识,就有可能建立我国南方活动地槽—稳定地台区中-晚元古代时间地层单位的框架性层型剖面。本文综合已取得共识的若干重要方面和存在争议的问题,分析分歧的原因和解决问题的途径,根据地层接触关系、区域地层对比、底辟、叠层石、微古植物、同位素年龄、古地磁和放射性元素丰度对比等方面的成果,来建立原始沉积的地层柱和反映地壳运动的重大地质事件,提出年代地层表及纪的命名的建议。
According to recent international and domestic decisions for chronostra-tigraphic classifications of Proteronic EON, based on the achieved rather high degree of research for the well developed Proterozoic strtigraphy in the Xi-kang-Yunnan Axis region, this paper presents that it is advisable to establish a framework stratotype section of chronostratigraphic units of Middle and Late Proterozoic Era in Mobile geosycline and stable platform of South China, in case that people get the same view-point on stratigraphic sequences, age, top and bottomand unconformitic boundaries caused by several geological events of the Kunyang Group(Hueili Group)and the Sinian System. Same recognization on seveal important aspects and diversity of opinions on certain points are introduced. Ways to the analysing of the causes of dif-ferent opinions and to the resolving of problems are recommended. Achieve-ments on stratigraphic contact relations, regional stratigraphic corelations, diapirisms, data of stromatolites, microflora, isotopic ages, palaeomagnetism and aboundance of radio elements are available to check and see whether or not they are credible in establishing an original sedimentary stratigraphlc co-lumn and reflecting the chief geological events of crustal movements. Sugges-tions on age-table and terms of Periods are presented.
出处
《云南地质》
1993年第1期101-108,共8页
Yunnan Geology
