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Iron toxicity for cyanobacteria delayed oxygen accumulation in early Earth's atmosphere
Universitaet Tübingen via Science Daily
Geomicrobiologists say the first oxygen-producing bacteria were poisoned by abundant iron in ancient oceans. Three billion years ago, Earth's atmosphere contained less than 0.0001 percent oxygen. Today's atmosphere has around 20 percent oxygen — and that is due to the work of tiny microorganisms in Earth's primeval oceans.
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New in GCA (v.148, 1 January 2015)
GS
Landslide-induced iron mobilisation shapes benthic accumulation of nutrients, trace metals and REE fractionation in an oligotrophic alpine stream

Chemical controls on the magnesium content of amorphous calcium carbonate

Synthetic fluid inclusions XIX. Experimental determination of the vapor-saturated liquidus of the system H2O–NaCl–FeCl2

Synthetic fluid inclusions XX. Critical PTx properties of H2O–FeCl2 fluids

Distinguishing between basalts produced by endogenic volcanism and impact processes: A non-destructive method using quantitative petrography of lunar basaltic samples

Copper partitioning between felsic melt and H2O–CO2 bearing saline fluids

Aggregation of nanoscale iron oxyhydroxides and corresponding effects on metal uptake, retention, and speciation: I. Ionic-strength and pH

Aggregation of nanoscale iron oxyhydroxides and corresponding effects on metal uptake, retention, and speciation: II. Temperature and time

Direct measurement of neon production rates by (α,n) reactions in minerals

The uranium isotopic composition of the Earth and the Solar System

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New in G-Cubed (v.15, issue 11)
GS
Apparent timing and duration of the Matuyama-Brunhes geomagnetic reversal in Chinese loess

Understanding which parameters control shallow ascent of silicic effusive magma

[Open Access]The role of elasticity in slab bending

Anthropophile elements in river sediments: Overview from the Seine River, France

Microstructures, composition, and seismic properties of the Ontong Java Plateau mantle root

Large-scale mechanical buckle fold development and the initiation of tensile fractures

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GEOCHEMISTRY IN THE NEWS


4 billion-year-old meteorite reveals climate of ancient Mars
Astronomy Now
A new analysis of a Martian rock that meteorite hunters plucked from an Antarctic ice field exactly 30 years ago today reveals a record of the planet's climate billions of years ago, back when water likely washed across its surface and any life that ever formed there might have emerged.
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Microbes take their sulfur light
Weizmann Institute of Science
A model explaining the preferences of deep-sea microbes can help reveal the ancient past — as well as predict the future.

See also: What the 'fecal prints' of microbes can tell us about Earth's evolution (McGill University)

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Death can't stop professor from getting 'last word'
Live Science
Caltech professor Don Anderson was the first person to unmask Earth's mysterious, multi-layered mantle, transforming science's conception of the planet from a boring, three-tiered baseball — crust, mantle and core — to a gobstobber worthy of Willy Wonka's candy factory. Anderson's love of science, his sense of fun and his brilliance came together one last time at the American Geophysical Union's annual meeting in San Francisco Dec. 19 — two weeks after his death.
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TRENDING ARTICLES
Missed last week's issue? See which articles your colleagues read most.

    Nature makes research papers open-access to the public (Science Alert)
'Oxygen in Earth's early atmosphere could have been incredibly sparse' (The Daily Galaxy)
Traces of possible Martian biological activity inside a meteorite (Ecole Polytechnique Federale de Lausanne via Phys.org)

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


 

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