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Uranium-bearing phosphatized limestones of NW Greece

Uranium-bearing phosphatized limestones of NW Greece | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

Sedimentary Mesozoic rocks from NW Greece (Epirus region), and particularly laminated phosphatized limestones, bedded chert-rich limestones and brecciated phosphatized limestones, were examined for their actinide content. Gamma-ray measurements using a HPGe detector showed that the above geological materials exhibit high radioactivity, mainly attributed to the 238U-series. The 238U content (up to 7700 Bq/Kg) was determined by the 1001 keV photopeak of 234mPa, the 238U daughter. Bulk geochemical analyses using ICP-OES/MS showed variable U concentrations with a notable value of 648 ppm in the case of dark organic-rich material hosted into the brecciated phosphatized limestones. Relatively high concentrations of Cd, probably related to apatite, were also revealed. On the other hand, the rock is geochemically depleted in LILE (e.g. Cs, Rb, K), as well as in As, Sb and Se in contrast to “average phosphorite”. Powder-XRD combined with optical microscopy, SEM-EDS and FTIR confirmed abundant apatite, besides calcite, as well as organic compounds (organic matter/O.M.) which should be associated to the high U content. According to Th/Sc vs. Zr/Sc discrimination diagrams the organic-rich part of the U-bearing phosphatised limestones exhibits a mafic trend, in contrast to the rest of the studied rocks lying close to typical pelagic sediments. However, Eu/Eu* vs. Ce/Ce* diagrams, in combination with SEM-EDS, indicated that the organic-rich part is a typical sedimentary material whereas the organic-poor (and also U-poor) part of the rock is secondary calcite related to surface waters. As far as we know, the studied rocks from NW Greece are classified among the richest U-bearing phosphatized limestones and/or sedimentary phosphorites in the world.

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ZEISS Mineralogic-Mining: a new automated mineralogy system on the market

ZEISS Mineralogic-Mining:  a new automated mineralogy system on the market | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it

This week, ZEISS released the latest automated mineralogy system to hit the market; Mineralogic-Mining.  Mineralogic-Mining combines a scanning electron microscope with one or more EDS detectors

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Los Alamos, Toshiba probing Fukushima with cosmic rays

Los Alamos National Laboratory has announced an impending partnership with Toshiba Corporation to use a Los Alamos technique called muon tomography to safely peer inside the cores of the Fukushima Daiichi reactors and create high-resolution images of the damaged nuclear material inside without ever breaching the cores themselves. The initiative could reduce the time required to clean up the disabled complex by at least a decade and greatly reduce radiation exposure to personnel working at the plant. Muon radiography (also called cosmic-ray radiography) uses secondary particles generated when cosmic rays collide with upper regions of Earth's atmosphere to create images of the objects that the particles, called muons, penetrate. The process is analogous to an X-ray image, except muons are produced naturally and do not damage the materials they contact. Muon radiography has been used before in imaginative applications such as mapping the interior of the Great Pyramid at Giza, but Los Alamos's muon tomography technique represents a vast improvement over earlier technology.

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Hf-Nd isotopic variability in mineral dust from Chinese and Mongolian deserts

Hf-Nd isotopic variability in mineral dust from Chinese and Mongolian deserts | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The authors report the clay-sized (<2 μm) Hf-Nd isotope data from Asian dust sources to better constrain the source and transport dynamics of dust deposition in the North Pacific.

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Nature Milestones in Crystallography

Nature Milestones in Crystallography | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Nature Milestones in Crystallography, a collaborative effort between Nature, Nature Materials, Nature Nanotechnology and Nature Structural & Molecular Biology, is the eleventh supplement in the series and is timed to coincide with the celebration of the 2014 International Year of Crystallography. Exactly 100 years ago, Max von Laue received the Nobel Prize in Physics “for his discovery of the diffraction of X-rays by crystals”. Since that discovery, crystallography has become an essential tool of investigation throughout the sciences, largely because it provides conclusive information on molecular structure down to the atomic level.

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Martian Rock and Dust Filling Studied with Laser and Camera - Mars Science Laboratory

Martian Rock and Dust Filling Studied with Laser and Camera - Mars Science Laboratory | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Scientists used the ChemCam instrument on NASA's Curiosity Mars rover to examine a Martian rock "shell" about one inch across, embedded in bedrock and with a hollow interior. This graphic combines an image of the target with results from using ChemCam's laser on the rock and adjacent points
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Ramp compression of diamond to five terapascals

Ramp compression of diamond to five terapascals | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Recent developments in shock-free dynamic (ramp) compression now allow laboratory access to this dense matter regime. Here we describe ramp-compression measurements for diamond, achieving 3.7-fold compression at a peak pressure of 5 terapascals (equivalent to 50 million atmospheres). These equation-of-state data can now be compared to first-principles density functionalcalculations and theories long used to describe matter present in the interiors of giant planets, in stars, and in inertial-confinement fusion experiments. Our data also provide new constraints on mass–radius relationships for carbon-rich planets.

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News & Events - Berkeley Lab Earth Sciences Division

News & Events - Berkeley Lab Earth Sciences Division | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
The Earth Sciences Division (ESD) at Berkeley Lab brings together geoscientists, mathematicians, microbiologists, computer scientists and engineers to address local, national and global problems related to energy resources, environmental...
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Mineralogy of the MSL Curiosity Landing Site in Gale Crater as Observed by MRO/CRISM

Mineralogy of the MSL Curiosity Landing Site in Gale Crater as Observed by MRO/CRISM | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
#Geophysics GRL: Mineralogy of the MSL Curiosity Landing Site in Gale Crater as Observed by MRO/CRISM http://t.co/vH8E3n0c2s
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Microspectroscopic Investigation of Arsenic Speciation and Distribution in Mine Wastes

Microspectroscopic Investigation of Arsenic Speciation and Distribution in Mine Wastes | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Researchers of Chapman University, the U.S. Geological Survey and SSRL have investigated the speciation of arsenic changes within mine tailings and surrounding soil samples. The scientists identified arsenic-containing mineral and sorbed species in size-fractionated mine wastes and adjacent soils from the Solomon Mine and the Descarga Tailings Dam in the Randsburg Historic Mining District, California, using extended x-ray absorption fine structure (EXAFS) spectroscopy at SSRL’s Beam Line 11-2. These analyses were paired with micro-x-ray fluorescence (μXRF) mapping of separate size fractions to identify multiple populations of particles with different arsenic-to-iron ratios.

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Cr(VI) Adsorption and Reduction by Humic Acid Coated on Magnetite

Cr(VI) Adsorption and Reduction by Humic Acid Coated on Magnetite | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Easily separable humic acid coated magnetite (HA-Fe3O4) nanoparticles are employed for effective adsorption and reduction of toxic Cr(VI) to nontoxic Cr(III). The adsorption and reduction of Cr(VI) is effective under acidic, neutral, and basic pH conditions.

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Viruses as new agents of organomineralization in the geological record

Viruses as new agents of organomineralization in the geological record | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Experimental data reveal that mineral precipitation takes place directly on free viruses and, as a result of viral infections, on cell debris resulting from cell lysis. Viruses are initially permineralized by amorphous magnesium silicates, which then alter to magnesium carbonate nanospheres of ~80–200 nm in diameter during diagenesis.

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Mineralogy of Newfound Planets Could Point to Habitability

Mineralogy of Newfound Planets Could Point to Habitability | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Astrobiologists hope that the detection of certain minerals on exoplanets by ever-more-sensitive space telescopes could indicate biochemical processes associated with life (#Minerology of #NewfoundPlanet could point to habitability.
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Belgrad INZA 2014

This video is about Belgrad INZA 2014
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Saharan dust is key to formation of Bahamas' Great Bank, study finds

Saharan dust is key to formation of Bahamas' Great Bank, study finds | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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.
Ath Godelitsas's insight:

See also "The fertilization of the Bahamas by Saharan dust: A trigger for carbonate precipitation?" by Swart et al.: http://geology.gsapubs.org/content/42/8/671

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Clinopyroxene precursors to amphibole sponge in arc crust

Clinopyroxene precursors to amphibole sponge in arc crust | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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This study provides evidence that amphibole develops by evolved melts overprinting earlier clinopyroxene—a near-ubiquitous mineral in arc magmas. Reaction-replacement of clinopyroxene ultimately forms granoblastic amphibole lithologies. Reaction-replacement amphiboles have more primitive trace element chemistry (for example, lower concentrations of incompatible Pb) than amphibole phenocrysts, but still have chemistries suitable for producing La/Yb and Dy/Yb ‘amphibole sponge’ signatures.

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Zircons reveal magma fluxes in the Earth's crust

Zircons reveal magma fluxes in the Earth's crust | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The authors show that age distributions of zircons, a mineral often present in crustal magmatic rocks in combination with thermal modelling, provide an accurate means of retrieving magma fluxes. The characteristics of zircon age populations vary significantly and systematically as a function of the flux and total volume of magma accumulated in the Earth’s crust.

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Occurrence of Cr(VI) in drinking water of Greece and relation to the geological background

Occurrence of Cr(VI) in drinking water of Greece and relation to the geological background | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Higher Cr(VI) values are observed in aquifers in alluvial and neogene sediments of serpentine and amphibolite, originating from the erosion of ophiolithic and metamorphic rocks. In contrast, Cr(VI) concentration in samples from ophiolithic and metamorphic rocks was always below 10 μg/L due to both low contact time and surface area, as verified by low conductivity and salt concentration values. These findings indicate that under specific conditions, pollution of water by Cr(VI) is favorable by a slow MnO2-catalyzed oxidation of soluble Cr(III) to Cr(VI) in which manganese products [Mn(III)/Mn(II)] are probably re-oxidized by oxygen.

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Blogs | University of Nottingham-British Geological Survey Centre for Environmental Geochemistry

Blogs | University of Nottingham-British Geological Survey Centre for Environmental Geochemistry | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
University of Nottingham-British Geological Survey Centre for Environmental Geochemistry (RT @MelJLeng: Some new blogs from the @BritGeoSurvey @UniofNottingham Centre for Environmental Geochemistry http://t.co/lvRr955181)...
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Saharan dust aerosol is the dominant source of dissolved iron in North Atlantic

Saharan dust aerosol is the dominant source of dissolved iron in North Atlantic | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The authors present a high-resolution transect of dissolved stable iron isotope ratios (δ56Fe) and iron concentrations ([Fe]) along a section of the North Atlantic Ocean. The different iron sources can be identified by their unique δ56Fe signatures, which persist throughout the water column. This allowed to calculate the relative contribution from dust, hydrothermal venting and reductive and non-reductive sedimentary release to the dissolved phase. They found that Saharan dust aerosol is the dominant source of dissolved iron along the section, contributing 71–87 per cent of dissolved iron.

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Experimentation - Geochemistry of volcanoes

Experimentation - Geochemistry of volcanoes | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
How can chemistry reveal a volcano’s hidden secrets?
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Atom-probe analyses of nanodiamonds from Allende

Atom-probe analyses of nanodiamonds from Allende | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The results demonstrate an instrumental bias associated with APT that needs to be quantified and corrected to obtain accurate isotope ratios. After this correction is applied, this technique should allow determination of the distribution of 12C/13C ratios in individual diamond grains, solving the decades-old question of the origin of meteoritic nanodiamonds.

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Upgrade for European Synchrotron

Upgrade for European Synchrotron | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

One of Europe's premier scientific research laboratories is to go through a major upgrade. The improvements to the European Synchrotron Radiation Facility (ESRF) will cost some 150m euros (£120m) and take until 2022 to complete fully. The 850m accelerator ring used to prime these bright X-rays will be replaced.

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Missing Lead and High 3He/4He in Ancient Sulfides Associated with Continental Crust Formation

Missing Lead and High 3He/4He in Ancient Sulfides Associated with Continental Crust Formation | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

Ancient sulfide-bearing cumulates would be characterized by unradiogenic Pb and He isotopes (high-3He/4He). These primitive signatures are usually attributed to primordial, undifferentiated mantle, but in this case, they are the very imprint of mantle differentiation via continent formation.

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Earth's earliest evolved crust generated in an Iceland-like setting

Earth's earliest evolved crust generated in an Iceland-like setting | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Iceland has been considered a suitable analogue for the generation of Earth’s earliest continental crust. However, the geochemical signature of sialic rocks from Iceland is distinct from the typical 3.9- to 2.5-billion-year-old Archaean rocks discovered so far. Here the authors report the discovery of an exceptionally well-preserved, 4.02-billion-year-old tonalitic gneiss rock unit within the Acasta Gneiss Complex in Canada.

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NASA WEB: NASA WEB -The CheMin (Chemistry and Mineralogy) instrument developed at NASA’s Ames Research Center with the participation of two SETI Institute

NASA WEB: NASA WEB -The CheMin (Chemistry and Mineralogy) instrument developed at NASA’s Ames Research Center with the participation of two SETI Institute | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
NASA WEB: NASA WEB -The CheMin (Chemistry and Mineralogy) in... http://t.co/KiWykxN6sf
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