Finding peaks in geochemical distributions: A re-examination of the helium-continental crust correlation

Rudge, J. F. (2008) Finding peaks in geochemical distributions: A re-examination of the helium-continental crust correlation. Earth and Planetary Science Letters, 274 (1-2). pp. 179-188. DOI 10.1016/j.epsl.2008.07.021

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Abstract

Parman has recently suggested that a correlation exists between peaks in the ocean island basalt (OIB) 4He/3He distribution and peaks in crustal zircon ages. This correlation is based on matching peaks seen in smooth kernel density estimates. Kernel density estimation is a very useful technique, but care is required when choosing the smoothing bandwidth as spurious peaks can be produced if the bandwidth is too small. Here I provide an introduction to a general statistical technique for determining whether peaks in density estimates are significant, know as SiZer, focusing on its application to the 4He/3He data. SiZer identifies only two statistically significant peaks in the OIB 4He/3He distribution, compared with the eight peaks identified by Parman. The helium-continental crust correlation does not seem to be supported by the current data.

Item Type: Article
Uncontrolled Keywords: 08AREP IA57 2008 P
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Earth and Planetary Science Letters
Volume: 274
Page Range: pp. 179-188
Identification Number: 10.1016/j.epsl.2008.07.021
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:03
Last Modified: 23 Jul 2013 10:08
URI: http://eprints.esc.cam.ac.uk/id/eprint/640

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