The nature of O18/O16 and C13/C12 secular trends in sedimentary carbonate rocks |
| |
Authors: | Ján Veizer Jochen Hoefs |
| |
Affiliation: | Department of Geology, University of Ottawa, Ottawa, Ontario KIN 6N5, Canada;Geochemisches Institut der Universität, Goldschmidtstrasse 1, 34 Göttingen, German Federal Republic |
| |
Abstract: | Measurements on 170 carbonate rocks show decreasing δO18 of similar magnitude for both limestones and dolomites over a time span of ~ 2800 m.y. The Proterozoic dolomites are on average heavier by ~5%. in δO18 than their coeval limestones. The data may indicate displacement in δC13 of about 3%. at approximately 570 m.y. ago, with Precambrian carbonates being heavier in δC13 at a given δO18 level than their Phanerozoic counterparts. The compilation of the previously published data is consistent with the above described features. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|