| Re-Os同位素在沉积地层精确定年及古环境反演中的应用进展 |
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| 关键词:Re-Os isotope sedimentary rocks strata dating tracing reconstruction palaeoenvironment |
| 基金项目:国家自然科学基金项目(编号: 41203037)；中国地质调查局地质大调查项目(编号: 12120113015500) |
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| The Progress of Applying Re-Os Isotope to Dating of Organic-rich Sedimentary Rocks and Reconstruction of Palaeoenvironment |
| As Re and Os are organophilic and redox-sensitive, Re and Os are concentrated from seawater in organic-rich sediments. Re-Os geochronology of organic-rich sediments has the potential to provide direct depositional ages and vital information on the Os isotope. The successful application of Re-Os in organic-rich sedimentary rocks making it possible to obtain absolute ages for the deposition of sedimentary successions directly, and hence the age of some sedimentary deposits and glacial can be dated and constrained. From the Re-Os isotope characteristics obtained for organic-rich sediments, the Palaeoenvironment can be reconstructed, and this helps to know and understand the paleoenvironmental evolution and to date and trace the metallic deposits and oil/gas reservoir, thus playing an important role in studying numerous major issues, such as the mass extinction and the impact events. Based on the Re-Os isotope data available, the authors obtained Os isotope curve for seawater from 2.7 Ga to the present day. In addition, the variations in the Os isotope compositions of seawater since 2.7 Ga are helpful to the study of the paleoenvironmental evolution. In this paper, some factors affecting the precision of Re-Os isochron age for organic-rich sediments are investigated. The Re-Os isotope system will play a unique role in the dating of organic-rich sedimentary rocks and the reconstruction of palaeoenvironment. |
| LI Chao,QU Wen-jun,WANG Deng-hong,ZHOU Li-min,DU An-dao,FU Yong,PEI Hao-xiang.2014.The Progress of Applying Re-Os Isotope to Dating of Organic-rich Sedimentary Rocks and Reconstruction of Palaeoenvironment[J].Acta Geoscientica Sinica,35(4):405-414. |
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