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 from hydrothermal waters and surficial nearshore sediments (<10 m water depth) at several vents in the Bros Thermi and Kephalos Bay hydrothermal fields.
Geomicrobiologists say that 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.
The authors investigated the speciation and distribution of Fe and As in flocs collected from low-flow streams (pH 5.3–6.3) of the naturally As-enriched peatland Gola di Lago (Switzerland) using 57Fe Mössbauer spectroscopy and Synchrotron X-ray techniques.
The goal of this study was to investigate the Hg stable isotope signatures of sediments in San Carlos Creek downstream of the former Hg mine New Idria, CA, USA and to relate the results to previously studied Hg isotope signatures of unroasted ore waste and calcine materials in the mining area.
Composition measurements by NASA's Mars Exploration Rover Opportunity confirm that this rock on the Martian surface is an iron-nickel meteorite. Researchers have informally named the rock "Block Island." With a width of about two-thirds of a meter (2 feet), it is the largest meteorite yet found on Mars.
A recent collaboration with geologist Alaura Singleton, from Dr. Gordon Osinski’s research group at Western University in London Ontario (Canada), and CHESS scientists Matthew Ward, Arthur Woll, and Margaret Koker, has utilized the new CHESS Maia detector to perform full spectrum iron K-edge x-ray absorption mapping experiments on impact melt bearing breccias. Melt bearing breccia samples were taken from the Mistastin impact structure, which was formed by a meteorite impact in Northern Labrador, Canada ~36 million years ago.
The authors propose a mathematical methodology for the geochemical discrimination of tsunami deposits using machine-learning techniques. The proposed method can determine the appropriate combinations of elements and the precise discrimination plane that best discerns tsunami deposits from non-tsunami deposits in high-dimensional compositional space through the use of data sets of bulk composition that have been categorised as tsunami or non-tsunami sediments.
The authors explore the isotopic characteristics of the global uranium cycle. They show that the subducted flux of uranium is isotopically distinct, with high 238U/235U ratios, as a result of alteration processes at the bottom of an oxic ocean. They also find that mid-ocean-ridge basalts (MORBs) have 238U/235U ratios higher than does the bulk Earth, confirming the widespread pollution of the upper mantle with this recycled uranium.
Bob got his B.S. and M.S. degrees from the University of Michigan, and his Ph.D. from Harvard. He did a postdoc at the Scripps Institution of Oceanography before moving to the University of Chicago as an Assistant Professor in 1963. He came to Yale in 1965, and stayed here for the rest of his career.
Ath Godelitsas's insight:
We extend our deepest, heartfelt condolences to his family at this most difficult time.
On the last day of 2014, the Taiwan Photon Source (TPS) has delivered its first synchrotron light at 13:58, an exciting news released by the National Synchrotron Radiation Research Center (NSRRC) in Hsinchu, Taiwan.
Are REEs best understood as simple commodities, or as strategic resources that can be used as tools of statecraft? And can Australia play a part in the development of alternative reliable sources of rare earths? To help understand the strategic importance of REEs the National Security College and Crawford School of Public Policy welcome two global experts in the field.
The authors report on the successful implementation of infrared near-field imaging, spectroscopy and analysis techniques capable of sub-micron scale mineral identification within natural samples, including a chondrule from the Murchison meteorite and a cometary dust grain (Iris) from NASA's Stardust mission.
The new ESRF ID16B-NA Nanoanalysis beamline has been applied for the first time for XRF imaging with a resolution level down to a few tens of nanometers on rare geological materials: meteoritic fragments from achondrite NWA 6693 and diamond inclusions.
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