认识偏心率周期的地层古气候意义

李前裕; 田军; 汪品先

Volume 30 Issue 5

Sep. 2005

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Article Navigation > Earth Science > 2005 > 30(5): 519-528

LI Qian-yu, TIAN Jun, WANG Pin-xian, 2005. Recognizing the Stratigraphic and Paleoclimatic Significance of Eccentricity Cycles. Earth Science, 30(5): 519-528.

Citation:

LI Qian-yu, TIAN Jun, WANG Pin-xian, 2005. Recognizing the Stratigraphic and Paleoclimatic Significance of Eccentricity Cycles. Earth Science, 30(5): 519-528.

LI Qian-yu, TIAN Jun, WANG Pin-xian, 2005. Recognizing the Stratigraphic and Paleoclimatic Significance of Eccentricity Cycles. Earth Science, 30(5): 519-528.

Citation:

LI Qian-yu, TIAN Jun, WANG Pin-xian, 2005. Recognizing the Stratigraphic and Paleoclimatic Significance of Eccentricity Cycles. Earth Science, 30(5): 519-528.

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Recognizing the Stratigraphic and Paleoclimatic Significance of Eccentricity Cycles

1.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
2.
School of Earth and Environmental Sciences, University of Adelaide, Adelaide SA5005, Australia

Received Date: 2005-05-17
Publish Date: 2005-09-25

Abstract

Abstract

This paper introduces some new developments concerning orbital eccentricity in stratigraphic and paleoclimatic studies. The less than 0.2% error in calculating the current orbital model for the last 250 Ma makes possible stratigraphic subdivisions based upon eccentricity cycles. The newly erected international standard chronostratigraphic timescale uses the 405 ka long eccentricity cycles for separating major stratigraphic boundaries, and the Cenozoic Era now comprises E1 to E162 long eccentricity cycles, with the base dated at (65.5±0.3) Ma. The 100 ka and 405 ka eccentricity cycles have been found in many geological records, especially those paleoclimate proxies based upon physiochemical records from deep-sea drilling cores. Many important paleoclimatic events appear to have concurred with weak amplitude periods over the eccentricity band, indicating these periods were likely prone to the influence of such factors as the global carbon reservoir, ice caps, sea level and electromagnetic field, as well as regional tectonic reconfigurations. More and more studies show that the δ¹³C record is mainly related to orbital forcing over the eccentricity cycles, and its changes often precede δ¹⁸O changes, supporting the hypothesis that the carbon cycle is one of the key factors influencing the earth's climate.
- earth's orbital theory,
- Milankovitch,
- eccentricity cycles,
- orbital stratigraphy,
- paleoclimate change

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References(37)

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