Isotopic evidence for variations in the marine calcium cycle over the cenozoic

被引：197

作者：

De La Rocha, CL

DePaolo, DJ

机构：

[1] Univ Calif Berkeley, Dept Geol & Geophys, Berkeley Ctr Isotope Geochem, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA

来源：

SCIENCE | 2000年 / 289卷 / 5482期

关键词：

D O I：

10.1126/science.289.5482.1176

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：1176 / 1178

页数：3