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- Title
柴达木盆地北缘古近系稀土元素地球化学特征 及其地质意义.
- Authors
苑广尧; 李凤杰
- Abstract
The paleoenvironment and paleoclimate of the Paleogene Paleocene Lulehe Formation and Oligocene Xiaganchaigou Formation in Qaidam Basin have high research value. In this paper, taking the northern margin of Qaidam Basin as an example, the tectonic setting, paleoclimate and paleo-redox conditions of the depositional source areas of the Paleogene Lulehe Formation and Xiaganchaigou Formation are discussed by using the test data of rare earth elements, in order to reveal the changes of paleoenvironment and paleoclimate. The research shows that: the Paleogene Lulehe Formation and Xiaganchaigou Formation have obvious negative Eu anomaly and slight negative Ce anomaly. The REDOX indices δCe<0.95, Ceanom<0 and U/Th<0.75 consistently indicate oxidation conditions. The value of paleoclimate ΣREE (63.38-170.88), Eu negative anomaly and Rb/Sr (mean value 0.44) indicate a warm and humid climate. The Sm/Nd values of 0.18-0.28 indicate that the sediments originated from the upper crust, and the corresponding relation of (La/Yb)N-ΣREE indicates that the sediments mainly originated from sedimentary rocks.
- Subjects
SEDIMENTARY rocks; PALEOGENE; GLOBAL warming; PALEOCLIMATOLOGY; PALEOCENE Epoch; RARE earth metals; YTTERBIUM
- Publication
Natural Gas Geoscience, 2023, Vol 34, Issue 8, p1374
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2023.03.020