Featured Articles
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Despite its vast size and key role in climate, relatively little is known about the Pacific’s paleoceanographic evolution. Since the late Neogene, the Pacific sea floor has lain largely beneath the carbonate compensation depth such that continuous carbonate sections from this interval are rare beyond the equatorial region. This sedimentation pattern stymies many traditional dating approaches; planktic foraminifer and calcareous nannofossil biostratigraphy and...
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An intense field study was conducted at the Susquehanna/Shale Hills Critical Zone Observatory to use water chemistry to probe the subsurface hydrogeochemical conditions and water flow dynamics. Soil pore water sampled through tension lysimeters suggest that contemporary reaction rates depend on preferential flowpaths and solute residence times, and are limited by dissolution kinetics. Thus weathering processes are strongly coupled with hydrological features of...
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The VentDB datasets are an effort to provide a complete set of global hydrothermal vent chemistry data. Chemical data for seafloor hydrothermal springs are fundamental to the study of mid-ocean ridge and seafloor processes, ocean water chemistry, global geochemical cycles, as well as vent ecosystems and sub-seafloor biospheres. By facilitating access to the global geochemical data set for hydrothermal springs, VentDB has a major impact on global geochemistry,...
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A suite of igneous rock samples from the floor of the Atlantic Ocean, obtained from PetDB, has systematic variation in major element chemical composition, as shown by the scatter plots (Figure 1). However, while scatter plots of pairs of elements reveal intriguing patterns of variation, they are limited by being two dimensional, whereas the chemical variation is multidimensional. Consequently, all the plots look...
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Journal of Geochemical Exploration, 110 (2), pg. 193-201. doi: dx.doi.org/10.1016/j.gexplo.2011.05.008 Recent efforts to understand Earth's elemental metal cycles have produced estimates for the integrated human-natural system metal mass reservoir stocks and inter-reservoir metal mass flows. These globally comprehensive metal cycles, called anthrobiogeochemical cycles, have been generated for Al, Fe, Cu, Zn, Ni, Pb, Ag, and Cr. While useful in visualizing the totality...
