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Acid Rock Drainage and Rock Weathering in Antarctica: Important Sources for Iron Cycling in the Southern Ocean

Acid Rock Drainage and Rock Weathering in Antarctica: Important Sources for Iron Cycling in the Southern Ocean | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

The dissolved iron (DFe) flux from rock weathering (nonmineralized control site) was calculated to be 0.45 × 109 g DFe yr–1 for the nowadays 5468 km of ice-free Antarctic rock coastline which is of the same order of magnitude as glacial or aeolian input to the Southern Ocean. Additionally, the two ARD sites alone liberate 0.026 and 0.057 × 109 g DFe yr–1 as point sources to the sea. The increased iron input correlates with increased phytoplankton production close to the source. This might even be enhanced in the future by a global warming scenario, and could be a process counterbalancing global warming.

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Periodico di mineralogia vol 83,3 - December 2014 | Edizioni Nuova Cultura

Periodico di mineralogia vol 83,3 - December 2014 | Edizioni Nuova Cultura | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Jaloul Bejaoui, Salah Bouhlel and Donatella Barca, Geology, Mineralogy and Fluid inclusions investigation of the Fluorite deposit at Jebel Kohol, northeastern Tunisia Silvia Bracco, Anna Brajkovic, Angiolina Comotti and Vanda Rolandi,...
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Goldschmidt 2015 Conference @goldschmidt2015

Goldschmidt2015 will be the 25th Goldschmidt conference, and to celebrate it we are returning to beautiful Prague, the same venue as Goldschmidt2011.
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Serpentinization: Implications for hydrogen production and habitability on Mars

Serpentinization: Implications for hydrogen production and habitability on Mars | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

The extensive presence of tetrahedral Fe3+ in serpentine shows the system liberally produced H2 while the isotope systematics have implications for preservation of indicators of the aqueous conditions that formed serpentinites on Mars and their habitability.

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Origin of life: Surface structures of sulfide minerals could explain emergence of life

Origin of life: Surface structures of sulfide minerals could explain emergence of life | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
The mineral greigite presents similar surface structures to the active sites found in many modern-day enzymes. We show that particles of greigite can reduce CO2 under ambient conditions into chemicals such as methanol, formic, acetic and pyruvic acid. Our results also lend support to the Origin of Life theor
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Chemists hope to break China's monopoly on rare-earth elements

Chemists hope to break China's monopoly on rare-earth elements | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Chemists hope to break China's monopoly on rare-earth elements by finding cheap, efficient ways to extract them from ore.
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Sulphur geodynamic cycle

Sulphur geodynamic cycle | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

This paper presents S/3He ratios of vesicles in mid-ocean ridge (MOR) basalt glass together with the ratios of high-temperature hydrothermal fluids to calculate the sulphur flux of 100 Gmol/y at MOR.

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Surface alteration mechanism and topochemistry of iron in tremolite asbestos

Surface alteration mechanism and topochemistry of iron in tremolite asbestos | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

With the aim to shed a light on this mechanism, two tremolite samples, one from Italy (Castelluccio) and one from USA (Maryland), immersed in a buffer solution (pH 7.4) with H2O2 were characterized by a multi-technique approach.

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Metal Stable Isotope Signatures as Tracers in Environmental Geochemistry

Metal Stable Isotope Signatures as Tracers in Environmental Geochemistry | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

A particular focus lies on a discussion of processes (redox transformations, complexation, sorption, precipitation, dissolution, evaporation, diffusion, biological cycling) which are able to induce metal stable isotope fractionation in environmental systems.

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Transient liquid water and water activity at Gale crater on Mars

Transient liquid water and water activity at Gale crater on Mars | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Liquid water on equatorial Mars is inconsistent with large-scale climatic conditions. Humidity and temperature measurements by the Curiosity rover support the formation of subsurface liquid brines by hydration of perchlorates during the night.
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Perchlorates are widespread on the surface of Mars and it is expected that liquid brines are abundant beyond equatorial regions where atmospheric humidity is higher and temperatures are lower.

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NASA's Curiosity rover finds astronauts could farm water on Mars - space - 13 April 2015 - New Scientist

NASA's Curiosity rover finds astronauts could farm water on Mars - space - 13 April 2015 - New Scientist | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
NASA's Curiosity rover has found evidence of a liquid water cycle on Mars, and harnessing this could one day make drinking water for astronauts
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Impacts of Aqueous Mn(II) on the Sorption of Zn(II) by Hexagonal Birnessite

Impacts of Aqueous Mn(II) on the Sorption of Zn(II) by Hexagonal Birnessite | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

XAS results show that Zn(II) adsorbs as tetrahedral and octahedral triple-corner-sharing complexes at layer vacancy sites when reacted with birnessite in the absence of Mn(II). Addition of aqueous Mn(II) causes no discernible change in Zn(II) surface speciation at pH 6.5, but triggers conversion of adsorbed Zn(II) into spinel Zn(II)1–xMn(II)xMn(III)2O4 precipitates at pH 7.5. This conversion is driven by electron transfer from adsorbed Mn(II) to structural Mn(IV) generating Mn(III) surface species that coprecipitate with Zn(II) and Mn(II).

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Liquid–Liquid Phase Separation in Aerosol Particles: Imaging at the Nanometer Scale

Liquid–Liquid Phase Separation in Aerosol Particles: Imaging at the Nanometer Scale | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

The authors report results of chemical imaging experiments using environmental scanning electron microscopy (ESEM) and scanning transmission X-ray microscopy (STXM) to investigate the LLPS of micrometer-sized particles undergoing a full hydration-dehydration cycle.

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Hydrothermal influence on nearshore sediments of Kos Island, Aegean Sea, Greece

Hydrothermal influence on nearshore sediments of Kos Island, Aegean Sea, Greece | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

The Kos-Nisyros volcanic centre is a long-active, Plio-Pleistocene magmatic system in the subduction zone along the easternmost edge of the active Hellenic volcanic arc in the Aegean Sea. Although today there are signs of relative quiescence in volcanic activity, active onshore fumaroles and shallow-sea hydrothermal vents persist on, amongst others, the island of Kos. The present study explores the large-scale imprint of hydrothermally sourced heavy metals and nutrients on the island’s coastal marine environment, based on geochemical data collected in September 2007 from hydrothermal waters and surficial nearshore sediments (<10 m water depth) at several vents in the Bros Thermi and Kephalos Bay hydrothermal fields.

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Future volcanism at Yellowstone caldera: Yellowstone Volcano: Geologists Say It Will Blow Without Warning

Future volcanism at Yellowstone caldera: Yellowstone Volcano: Geologists Say It Will Blow Without Warning | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
A recent scientific paper by the The Geological Society Of America titled: Future volcanism at Yellowstone caldera, suggests that previous eruptions have come from deep within the volcano and they ...
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Rare African plant signals diamonds beneath the soil

Rare African plant signals diamonds beneath the soil | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Geologist discovers first botanical indicator for diamond-bearing rock
Ath Godelitsas's insight:

See also the corresponding paper: http://econgeol.geoscienceworld.org/content/110/4/851.abstract

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μXANES study of iron redox state in serpentine during oceanic serpentinization

μXANES study of iron redox state in serpentine during oceanic serpentinization | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

The authors measured the iron redox state in oceanic serpentine minerals using μXANES.

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Carbonate minerals could remediate contaminated groundwater

Carbonate minerals could remediate contaminated groundwater | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

See also the corresponding paper: http://www.sciencedirect.com/science/article/pii/S0016703714006358

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SPring-8 Synchrotron 施設公開用

2009年度制作。大型放射光施設SPring-8(スプリングエイト)の施設紹介。
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A first step toward the understanding of the mechanisms inducing carcinogenicity in fibrous minerals

A first step toward the understanding of the mechanisms inducing carcinogenicity in fibrous minerals | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

Two samples of fibrous erionite from different localities of Oregon, USA were suspended in FeCl2 solutions at different concentrations, at pH ca. 5, in anaerobic conditions. Identification of segregation of Fe (II) at Ca3, which is coupled with the high surface area of erionite, provides very important information for the understanding of the molecular mechanism/s inducing its strong carcinogenicity.

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Urban soil geochemistry in Athens Greece

Elsevier Audioslides presentation on the paper "Urban soil geochemistry in Athens, Greece: The importance of local geology in controlling the distribution of ...
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International Natural Zeolite Association

International Natural Zeolite Association | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
International Natural Zeolite Association
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International Natural Zeolite Association
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Dry (Mg,Fe)SiO3 perovskite in the Earth's lower mantle

Dry (Mg,Fe)SiO3 perovskite in the Earth's lower mantle | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

Combined synthesis experiments and first-principles calculations show that MgSiO3-perovskite with minor Al or Fe does not incorporate significant OH under lower mantle conditions.

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Welcome to the Deep Carbon Observatory

A quick overview of the Deep Carbon Observatory, including a survey of the resources available on the DCO community and data portals (https://deepcarbon.net)

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Chabazite: Stable Cation-Exchanger in Hyper Alkaline Concrete Pore Water

Chabazite: Stable Cation-Exchanger in Hyper Alkaline Concrete Pore Water | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

Chabazite is typically synthesized in 1 M KOH solutions but also crystallizes in simulated young cement pore water, a pH 13 aqueous solution mainly containing K+ and Na+ cations. Its formation and stability in this medium was evaluated as a function of temperature (60 and 85 °C) over a timeframe of more than 2 years and was also asessed from a mechanistic point of view. Chabazite demonstrates excellent cation-exchange properties in simulated young cement pore water.

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World's largest asteroid impact site could be in Australia

World's largest asteroid impact site could be in Australia | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Not long ago, asteroid impacts weren't considered as a significant factor in the evolution of Earth.
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