Geochemistry: a matter of preservation

Hawkesworth, Chris, Cawood, Peter, Kemp, Tony, Storey, Craig, and Dhuime, Bruno (2009) Geochemistry: a matter of preservation. Science, 323 (5910). pp. 49-50.

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The fossil record is well known to be biased by the unevenness of the geographical and stratigraphical sampling effort and inequality in the rock record available for sampling (1). There is increasing evidence that a similar unevenness biases the geological record of the generation and evolution of the continental crust. In a recent study, Campbell and Allen (2) reemphasized the link between peaks in the distribution of the uranium- lead (U-Pb) crystallization ages of the mineral zircon (which reflect the ages of the parent igneous rocks) and the development of supercontinents. It is not clear, however, why the development of supercontinents should be associated with the generation of unusual volumes of igneous rocks. Instead, peaks of crystallization ages in the continental record are likely to reflect biases in preservation.

Item ID: 5275
Item Type: Article (Research - C1)
ISSN: 1095-9203
Date Deposited: 20 Sep 2009 23:26
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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