Featured Articles
Delano Thumbnail IEDA Data Rescue Mini-Award: Lunar Samples

An enduring legacy of the Apollo program is the lunar sample collection that is currently maintained and curated at Johnson Space Center in Houston, TX. These samples, obtained at tremendous cost and great risk, are the only samples that have ever been returned by astronauts from the surface of another planetary body.

Grove & Brown (2018) Magmatic processes leading to compositional diversity in igneous rocks: Bowen (1928) revisited

Grove and Brown present a perspective on the evolution of thought on the origin of compositional diversity in igneous rocks. They explore the difficulty Bowen faced due to a paucity of data and samples, noting that basalts from mid-ocean ridges had yet to be dredged from the ocean floor. During Bowen’s tenure, major element analyses could only be made on bulk rocks, with no trace element or… Read More

McCubbin et al., (2017) A Low O/Si Ratio on the Surface of Mercury: Evidence for Silicon Smelting?

The MESSENGER spacecraft, “collected data providing important insights into the structure, chemical makeup, and compositional diversity of Mercury.” The atypically low ratios of these Mercury measurements were contextualized and visualized by plotting previously known values of O wt% vs Si wt% from large compendia of Lunar and Martian data, meteoritic samples, and terrestrial rock data… Read More

Greber et al., (2017) Titanium isotopic evidence for felsic crust and plate tectonics 3.5 billion years ago

Using the titanium isotopic make up of shales, Greber et al. develop a proxy for reconstructing the SiO2 content of shale source rocks and thus the chemical composition of emerged crust. From this they construct a mixing model to translate titanium isotope values of shales into an estimate of the crustal composition, and an emergence of predominantly felsic crust since at least 3.5 Ga.  

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