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Magma beneath the Cascade volcanoes might be special blend
If we were to draw a schematic cartoon diagram of a subduction zone, it would include a diving oceanic plate, represented by a uniform slab. As the plate dove deeper, water driven off by the increasing heat might be shown with a blue arrow. And, of course, that water will create some blobs of red magma in the mantle between the two tectonic plates, as adding water lowers the melting point of the rock.
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New in GCA (v.156, 1 May 2015)
Helium diffusion in olivine based on first principles calculations
An experimental and ab initio study on the abiotic reduction of uranyl by ferrous iron
Uranium and molybdenum isotope evidence for an episode of widespread ocean oxygenation during the late Ediacaran Period
Uranium reduction on magnetite: Probing for pentavalent uranium using electrochemical methods
Spatial distributions of sulphur species and sulphate-reducing bacteria provide insights into sulphur redox cycling and biodegradation hot-spots in a hydrocarbon-contaminated aquifer
Distribution of dissolved manganese in the Peruvian Upwelling and Oxygen Minimum Zone
Analab manufacture corrosion resistant laboratory appliances such as acid vapour cleaning stations, hotplates, and sample preparation devices. Our devices can be used with a wide range of acids and bases (HF to NH4OH). We are represented in North America by Isomass Scientific.
Please visit us at Goldschmidt Aug 16 – 21/15 in Prague.
New in G-Cubed (v.16, issue 3)
A global model for cave ventilation and seasonal bias in speleothem paleoclimate records
Structural heterogeneity of the midcrust adjacent to the central Alpine Fault, New Zealand: Inferences from seismic tomography and seismicity between Harihari and Ross
Natural remanent magnetization acquisition in bioturbated sediment: General theory and implications for relative paleointensity reconstructions
Tracking the Late Jurassic apparent (or true) polar shift in U-Pb-dated kimberlites from cratonic North America (Superior Province of Canada)
Reconciling subduction dynamics during Tethys closure with large-scale Asian tectonics: Insights from numerical modeling
Conference Calendar June deadlines
June 16: Soil Science Society of America 2015 International Annual Meeting (USA)
June 15: AIG-11: Applied Isotope Geochemistry Conference (France)
June 16: 2015 Goldschmidt Conference (Czech Republic)
June 22: Microscopy & Microanalysis 2015 (USA)
June 27: Gordon Research Seminar (GRS): Precedes Gordon Research Conference (GRC) on Chemical Oceanography (USA)
June 27: Annual Meeting of the Meteoritical Society (USA)
June 28: 2015 Gordon Research Conference (GRC) on Chemical Oceanography - Processes at Interfaces: Bridging Spatial, Temporal and Disciplinary Divides from Micro- to Global Scales (USA)
June 30: 22nd International Symposium for Environmental Biogeochemistry (Slovenia)
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Ocean on Saturn moon Enceladus may have potential energy source to support life
Saturn's icy moon Enceladus is looking better and better as a potential abode for alien life.
Chemical reactions that free up energy that could potentially support a biosphere have occurred — and perhaps still are occurring — deep within Enceladus' salty subsurface ocean, a new study suggests.
Floods might have doomed prehistoric American city
Cahokia was a pretty big deal in the 1100s. Founded by a complex cultural group that built tall mounds and sweeping plazas, the city near present-day St Louis, Missouri, was home to tens of thousands of people. But its population began declining around 1200, and by 1350, Cahokia was a ghost town.
The surprising link between fjords and carbon
The magnificent, steep-sided fjords that slice deeply into the coastlines of New Zealand, Norway and Alaska are hugely popular attractions for tourists. But they may be surprisingly important to the Earth's climate system as well.
While fjords make up just one tenth of one percent of the oceans' surface area they account for about 11 percent of the carbon locked away in marine sediments each year — carbon that can't leak out into the atmosphere to add to global warming, says a new report in Nature Geoscience.
Previously unknown sink for methane deep discovered deep in granitic rock
A study published in Nature Communications, April 2015, by Henrik Drake of Linnaeus University, Sweden, and colleagues, explores a previously unknown sink for the greenhouse gas methane at great depth in fractured granitic rock. The methane in the granite is consumed through microbe-mediated anaerobic oxidation, a process dominantly described from marine seabeds where it significantly mitigates the escape of methane to the atmosphere. However, the methane oxidation deep in the granite shows several intriguing differences compared to marine seabeds.
Rare plant only grows over diamond deposits
A researcher from Florida International University has reportedly discovered a palm-like, thorn-covered plant in Liberia that only grows on top of diamonds.
Provided the discovery is accurate, Science explains, the plants could provide an easy way for people to find the location of diamond deposits buried deep beneath the ground. The species is known as Pandanus candelabrum, and is the first indicator species for diamond-rich kimberlite, FIU researcher Stephen Haggerty wrote in his recent Economic Geology study.
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