摘要
在野外经常能看到一些具有“韵律”性的沉积。Ramsbottom(引自T.Neville George,1978)运用造海运动的观点对这一地质现象进行了成功的解释,因此这一学说引起了越来越多的地质工作者的重视。造海运动,也就是全球海平面的变化,在地质历史中,对沉积作用具有重要的影响。对造海运动的研究,无疑也会作为一种手段,更好地从事地层对比、古环境、古气候以及成矿时代等方面的研究。通常通过对地层沉积旋回和沉积韵律等方面的研究,来了解某一地区的造海运动,获得一些近似的能够反应海平面变化的定性图表,但是不能了解海侵海退的实际规模,同时也不能对这些定性的示意图进行定量的对比研究,所以,对海平面变化的定量研究必然比从过去的定性研究能够获得更具体。
This paper deals mainly with the result of quantitative study on eustatic movements in China. Based on information from the Atlas of Paleogeogrnphy of China edited by Wang Hongzhen(1985), paleoeontinental and paleooceanic areas of China from the Early Sinian to the Late Triassic is calculated by using point--counting method and two curves representing eustatic changes through geological time were obtained. These two curve diagrams are for different study regions, one covers whole China and the other focused on the Yangtze Platform. It is found that these two curve diagrams are of certain similarities and reveal some tectonic movement features during the periods. In this study, a Dovonian stratigraphie section in Dushan. Guizhou Province, is studied and a diagram of eustatic tendency during the time is plotted qualitatively, it is concluded that the eustatic tendency in this local area is coincided with that in the Yangtze Platform.
出处
《地质科学》
CAS
CSCD
北大核心
1992年第4期409-411,共3页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
造海运动
海平面
海侵
变化
Thalassogenesis, Transgression, regression, point-to volume calculation method
