Featured Articles
Giovas thumbnail Giovas et al., (2016) Sr and Pb isotopic investigation of mammal introductions: Pre-Columbian zoogeographic records from the Lesser Antilles, West Indies

In a novel use of EarthChem data, Giovas et al., compile results from lithological studies of Pb isotope ratios to provide a framework for assessing bioavailable lead. The underlying lithology of a region contributes directly to bioavailable Sr and Pb. These isotopes are taken up during skeletal tissue formation with very little fractionation, thus the bioavialable fractions of Sr and Pb… Read More

Michael thumbnail Michael, P. and Graham, D. (2016) The behavior and concentration of CO2 in the suboceanic mantle: Inferences from undegassed ocean ridge and ocean island basalts

The amount of non-anthropogenic versus anthropogenic input of CO2 to the Earth’s atmosphere is currently a hotly debated topic. The most direct way to estimate volatile flux from the interior of the Earth is by measuring the concentration of the volatiles in basaltic magma as it moves to the surface. While the CO2 of naturally quenched glasses from mid-ocean ridge basalts (MORBs) and ocean… Read More

Weiss thumbnail Weiss, Y. et al., (2016) Key new pieces of the HIMU puzzle from olivines and diamond inclusions

Conventionally the so-called “HIMU” (High U/Pb Mantle) ocean islands have been considered as representing subducted basaltic ocean crust that has cycled through the mantle to become part of mantle plumes. This paper by Weiss et al. presents a radically different interpretation, that the HIMU ocean island mantle source represents subcontinental lithospheric mantle (SCLM) that was metasomatized… Read More

Iwamori Thumbail Iwamori et al., (2015) Isotopic heterogeneity of oceanic, arc and continental basalts and its implications for mantle dynamics

By mining geochemical data of basalts from databases, such as PetDB, Iwamori and Nakamura created a large data set of isotopic values from Mid-ocean Ridge Basalts, Ocean Island Basalts and Continental Basalts. Independent Component Analysis was found to be applicable in capturing the overall structure of the data, including mantle geochemical end-members.

Carbotte thumbnail Carbotte et al., (2015) Tectonic and magmatic segmentation of the Global Ocean Ridge System: a synthesis of observation.

Do ridge axis geometry and geochemical properties reflect source composition variations of the underlying magmatic plumbing system? Carbotte et al. (2015) explore this question by examining the relationship between magmatic and tectonic segmentation at mid-ocean ridges using a synthesis of geophysical and geochemical data from a large number of sources.