Isotopic Evidence for Variations in the Marine Calcium Cycle Over the Cenozoic-Reference-Cited by-同舟云学术

Isotopic Evidence for Variations in the Marine Calcium Cycle Over the Cenozoic

Published:2000-08-18 Issue:5482 Volume:289 Page:1176-1178
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

De La Rocha Christina L.¹,DePaolo Donald J.¹²

Affiliation:

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

2. Earth Sciences Division, E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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