新生代海洋钙循环变化的同位素证据。

Isotopic evidence for variations in the marine calcium cycle over the Cenozoic.

作者信息

De La Rocha C L, DePaolo D J

机构信息

Berkeley Center for Isotope Geochemistry, Department of Geology and Geophysics, University of California, Berkeley, CA 94720-4767, USA.

出版信息

Science. 2000 Aug 18;289(5482):1176-8. doi: 10.1126/science.289.5482.1176.

DOI:10.1126/science.289.5482.1176

PMID:10947981

Abstract

Significant variations in the isotopic composition of marine calcium have occurred over the last 80 million years. These variations reflect deviations in the balance between inputs of calcium to the ocean from weathering and outputs due to carbonate sedimentation, processes that are important in controlling the concentration of carbon dioxide in the atmosphere and, hence, global climate. The calcium isotopic ratio of paleo-seawater is an indicator of past changes in atmospheric carbon dioxide when coupled with determinations of paleo-pH.

摘要

在过去的8000万年里，海洋钙的同位素组成发生了显著变化。这些变化反映了风化作用向海洋输入钙与碳酸盐沉积输出钙之间平衡的偏差，而这些过程对于控制大气中二氧化碳浓度以及全球气候至关重要。古海水的钙同位素比值与古pH值的测定相结合时，是过去大气二氧化碳变化的一个指标。