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Study: Saharan dust is key to formation of Bahamas' Great Bank
University of Miami Rosenstiel School of Marine & Atmospheric Science via ScienceDaily
Saharan dust played a major role in the formation of the Bahamas islands, a new study suggests. Researchers showed that iron-rich Saharan dust provides the nutrients necessary for specialized bacteria to produce the island chain's carbonate-based foundation. Persistent winds across Africa's 3.5-million square mile Sahara Desert lifts mineral-rich sand into the atmosphere where it travels the nearly 5,000-mile northwest journey towards the U.S. and Caribbean.
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New in GCA (v.139, 15 August 2014)
Multi-specimen and multi-site calibration of Aleutian coralline algal Mg/Ca to sea surface temperature

Insights from Pb and O isotopes into along-arc variations in subduction inputs and crustal assimilation for volcanic rocks in Java, Sunda arc, Indonesia

Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: Implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution

Abundances of presolar silicon carbide grains in primitive meteorites determined by NanoSIMS

Progressive aqueous alteration of CR carbonaceous chondrites

[open access] Sources and distributions of branched and isoprenoid tetraether lipids on the Amazon shelf and fan: Implications for the use of GDGT-based proxies in marine sediments

Diffusion of multi-isotopic chemical species in molten silicates

Formation of single domain magnetite by green rust oxidation promoted by microbial anaerobic nitrate-dependent iron oxidation

Benthic metal fluxes and sediment diagenesis in a water reservoir affected by acid mine drainage: A laboratory experiment and reactive transport modeling

Temperature limits for preservation of primary calcite clumped isotope paleotemperatures

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  Explore & Mine Petrological Data

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New in G-Cubed (v.15, issue 5)
Acoustic estimates of methane gas flux from the seabed in a 6000 km2 region in the Northern Gulf of Mexico

Precessional control of Sr ratios in marginal basins during the Messinian Salinity Crisis?

Thermogenic methane injection via bubble transport into the upper Arctic Ocean from the hydrate-charged Vestnesa Ridge, Svalbard

Sensitivity of sediment geochemical proxies to coring location and corer type in a large lake: Implications for paleolimnological reconstruction

Helium isotopic textures in Earth's upper mantle

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Rainwater discovered at new depths, with high pressure and temperatures more than 300 degrees Celsius
University of Southampton via ScienceDaily
Researchers have found that rainwater can penetrate below the Earth's fractured upper crust, which could have major implications for our understanding of earthquakes and the generation of valuable mineral deposits. It had been thought that surface water could not penetrate the ductile crust — where temperatures of more than 300 degrees Celsius and high pressures cause rocks to flex and flow rather than fracture — but researchers have now found fluids derived from rainwater at these levels. Fluids in the Earth's crust can weaken rocks and may help to initiate earthquakes along locked fault lines.
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Research charts ecological impact of microbial respiration in oxygen-starved ocean
University of British Columbia via ScienceDaily
A sulfur-oxidizing bacterial group called SUP05 will play an increasingly important role in carbon and nutrient cycling in the world's oceans as oxygen minimum zones expand, according to research. To conduct this study, researchers plumbed the depth of a seasonally anoxic fjord, Canada's Saanich Inlet, to chart how microbial community metabolism changes as oxygen minimum zones form.
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Missed last week's issue? See which articles your colleagues read most.

    Caltech-led team develops a geothermometer for methane formation (Caltech)
Fracking flowback could pollute groundwater with heavy metals (Cornell University via ScienceDaily)
New tunable laser spectrometer measures rare methane isotopologues (Deep Carbon Observatory)
Ancient ocean currents may have changed pace and intensity of ice ages (National Science Foundation)

Don't be left behind. Click here to see what else you missed.


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