Mantle melting conditions under the eastern volcanic front of Kamchatka estimated from melt inclusions in olivine

Here we present new data on the composition of olivine phenocrysts, melt inclusions and inclusions of chromium spinel in olivine from high Mg# basalts of the Eastern Volcanic Front in Kamchatka

Silver and copper fractionation in MORB

Ag and Cu are strongly chalcophile elements, and their behavior in magmatic systems is highly dependent on the presence of solid or liquid sulfide phase in magmas and their sources..

Complications of the recovery period after arthroscopic reconstruction of the anterior cruciate ligament

A review of the literature is devoted to the problem of complications after arthroscopic reconstruction of the anterior cruciate ligament. The authors covered questions of epidemiology and surgical technique, touched on important aspects of the main complications, such as graft damage, arthrofibrosis and impingement syndrome, the formation of synovial cysts, infections, the development of osteoarthritis and cartilage degeneration. Despite the prevalence of pathology, a huge number of publications and the development of arthroscopic surgery, there are many theoretical and technical problems, that have not yet found a satisfactory solution and require further development. A relevant question for the doctor is the problem of correctly choosing the method or combination methods for anterior cruciate ligament reconstruction in relation for each patient, considering the individual characteristics and possible risks of developing different complications in patient

Building the Record of late Miocene to Pleistocene Explosive Activity in the Kurile-Kamchatka Volcanic Arc: Initial Results and Challenges

Large explosive eruptions are among the most extreme natural events and can produce hemispheric or even global catastrophic effects. One of the prerequisites of predicting future giant eruptions is the understanding of sizes and recurrence times of past similar events. Volcanism of the North Pacific arcs is highly explosive, which is attested by large nested calderas and numerous tephra layers in marine and terrestrial sediments..

Paleoarchean mantle hydrous reservoir beneath South Africa?

Recent study of melt inclusions in high magnesian olivines (Fo 92.4-Fo 94.2) from the 2.7 Ga komatiites of the Abitibi Greenstone Belt, Canada [Sobolev et al, Nature, 2016] demonstrates an early contamination of melts by seawater brines indicated by elevated concentrations of Cl. Yet the melt inclusions in the most magnesian olivines (Fo 94-94.5) that have not been affected by the seawater contain up to 0.8 wt.% H2O suggesting presence of hydrous reservoir in the deep mantle at Neoarchean time. The present contribution may extend the age of this reservoir by 800 million years..

Semi-empirical model of middle atmosphere wind from the ground to the lower thermosphere

During recent years, special attention has been paid to understanding the background circulation of the middle atmosphere. Particularly in the mesosphere/lower thermosphere (MLT) region, this has involved including data from a range of new radar measurements. It has also involved the comparison of existing empirical middle atmosphere wind models, such as CIRA-86 and HWM-93 to the new data. This has led to the construction of empirical models of MLT winds such as the Global Empirical Wind Model (GEWM). Further investigations are aimed at the construction of new empirical and semi-empirical wind models of the entire middle atmosphere including these new experimental results. The results of a new wind climatology (0-100 km) are presented here, based upon the GEWM, a reanalysis of stratospheric data, and a numerical model which is used to fill the gap between data from the stratospheric and MLT regions. © 2008 COSPAR