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Ancient lake challenges understanding of evolution
University of Aberdeen via Phys.org
Scientists have studied samples of lake sediments deposited 1.5 billion years ago in the Bay of Stoer region in north-west Scotland, and discovered high levels of the metal molybdenum, a key element in the evolution of multicellular life.
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New in GCA (v.157, 15 May 2015)
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Reassessing the stable (δ88/86Sr) and radiogenic (87Sr/86Sr) strontium isotopic composition of marine inputs

Dissolution rate of borosilicate glass SON68: A method of quantification based upon interferometry and implications for experimental and natural weathering rates of glass

Experimental calibration of Mg isotope fractionation between dolomite and aqueous solution and its geological implications

Zinc isotope fractionation during adsorption onto Mn oxyhydroxide at low and high ionic strength

Carbon and chlorine isotopologue fractionation of chlorinated hydrocarbons during diffusion in water and low permeability sediments

[open access] Laboratory calibration of the calcium carbonate clumped isotope thermometer in the 25–250 °C temperature range

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New in G-Cubed (v.16, issue 3)
GS
Split-beam echo sounder observations of natural methane seep variability in the northern Gulf of Mexico

Germanium/silicon of the Ediacaran-Cambrian Laobao cherts: Implications for the bedded chert formation and paleoenvironment interpretations

Mid-mantle anisotropy in subduction zones and deep water transport

[open access] Paleointensity determinations from the Etendeka province, Namibia, support a low-magnetic field strength leading up to the Cretaceous normal superchron

New mafic magma refilling a quiescent volcano: Evidence from He-Ne-Ar isotopes during the 2011–2012 unrest at Santorini, Greece

Episodic and multistaged gravitational instability of cratonic lithosphere and its implications for reactivation of the North China Craton

[open access] Hydrous upwelling across the mantle transition zone beneath the Afar Triple Junction

[open access] Historical bathymetric charts and the evolution of Santorini submarine volcano, Greece

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GEOCHEMISTRY IN THE NEWS


Deciphering clues to prehistoric climate changes locked in cave deposits
Vanderbilt University via ScienceDaily
It turns out that the steady dripping of water deep underground can reveal a surprising amount of information about the constantly changing cycles of heat and cold, precipitation and drought in the turbulent atmosphere above. The analysis of a stalagmite from a cave in north east India can detect the link between El Nino conditions in the Pacific Ocean and the Indian monsoon, a new study has found.
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New technique shows shale-drilling additives in drinking-water taps near leak
Pennsylvania State University via Phys.org
Substances commonly used for drilling or extracting Marcellus shale gas foamed from the drinking water taps of three Pennsylvania homes near a reported well-pad leak, according to new analysis from a team of scientists.
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That mother of all extinctions
The Telegraph
Close on the heels of the Himalayan earthquakes that have ravaged Nepal has come a reminder that the rocks that make up the mountains once lay beneath an ocean and witnessed what scientists call "the mother of all extinctions". Scientists have found in India's Spiti Valley fresh geochemical signatures of a catastrophic event that wiped out over 80 per cent of species on earth about 252 million years ago.
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