Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Geochemical characteristics across the Cambrian-Ordovician boundary at Tangshan,Nanjing

Shen Wei-zhou Fang Yi-ting Ni Qi-sheng Liu Yan (Department of Earth Sciences,Nanjing University,Nanjing,210093)  
This paper deals with the isotopes(δ~(13)C and δ(18)O),trace elements of Late Cambrian-Early Ordovician age and the Cambrian-Ordovician boundary at Tangshan, Nanjing.Based on the similarity of δ~(18)O compositions occurring in dolomite and calcite in the dolostone at the upper part of the Kuanyintai Formation,it is possible that the dolomite is penecontemporaneous through alternation in early stage of diagensis.The isotopic analyses of dolomites and limestones from the upper part of the Kuanyintai For- mation,Lunshan Formation and the lower part of the Hunghuayuan Fomation suggest that these carbonates were mainly formed in the diagenic environment of burial stage. The weak anomalies of δ~(13)C of the Cambrian-Ordovician boundary exhibit that the change of sea level was not conspicuous during the latest Cambrian to early Ordovician.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved