Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Earth Science(Journal of China University of Geosciences)》 2015-02
Add to Favorite Get Latest Update

Triassic Chronostratigraphy and Chinese Stages

Tong Jinnan;Yin Hongfu;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences;  
Construction of a global scheme of Triassic time scale was the first key task of the Subcommission on Triassic Stratigraphy(STS)since its foundation in 1971.Based upon the scheme of Triassic time scale resulted from the research of the International Geological Correlation Programme IGCP-4(Triassic of the Tethys Realm),the STS members made an in-depth discussion and finally voted in 1991 for the scheme that the Triassic is divided into 3series and 7stages.STS has been working on the selection of the Global Stratotype Section and Point(GSSP)of the stage boundary.However,only 3GSSPs have been decided in the Triassic up to the present,and among them only the base of the Triassic,i.e.,the base of the Induan Stage,has been well studied and widely applied to various areas over the world,whereas the other 2GSSPs,i.e.,the bases of the Ladinian and Carnian stages,are defined through the traditional ammonoid indexes and their extension and application need to be confirmed by further investigation.The selections on the stratotypes of the remaining 4stages have been in progress but they are challenged by some issues,especially the decision of the Induan-Olenekian boundary stratotype.Considering the difficulties in the construction of the International Chronostratigraphic Chart,the Stratigraphic Commission of China proposed a Chinese Chronostratigraphic Chart in 2000 to meet the demands of the geological survey and researches in China.Since the Triassic was the turning period from marine to terrestrial facies in the geological history and both marine and terrestrial Triassic strata are widespread in China,two schemes of Chinese Triassic chronostratigraphic division corresponding respectively to the marine and terrestrial facies and related Chinese stages have been suggested.After ten years of study and application,the schemes for the Chinese Triassic chronostratigraphic divisions and stages have been improved and refined,which promotes the standardizationof the Triassic studies in China,and facilitates the global Triassic stratigraphic and related researches as well.
【Fund】: 国家自然科学基金项目(No.41272372);; 国土资源大调查项目专题(No.1212011120116)
【CateGory Index】: P534.51
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved