GEMAS: unmixing magnetic properties of European agricultural soil

High resolution magnetic measurements provide new methods for world-wide characterization and monitoring of agricultural soil which is essential for quantifying geologic and human impact on the critical zone environment and consequences of climatic change, for planning economic and ecological land use, and for forensic applications. Hysteresis measurements of all Ap samples from the GEMAS survey yield a comprehensive overview of mineral magnetic properties in European agricultural soil on a continental scale

Metallic Iron in Basalts of the Malyi Yenisei Lava River: Results of Thermomagnetic Study

This paper shows that the mineral composition of dolerites affects their specific paramagnetic susceptibility. Two methods for calculating the specific paramagnetic susceptibility were proposed: one used the thermomagnetic analysis (TMA) curve and the other the Mi(B) curve. There was no significant difference between the results obtained with these two approaches. Application of the proposed methods to dolerite core samples showed that specific paramagnetic susceptibility can be used as the basis for correlation of sills. The composition of titanomagnetites in dolerites can be used as an accessory parameter.461-46

Picroilmenite in Kimberlites and Titanomagnetites of the Yakutian Diamond-Bearing Province: Magnetic and Mineralogical Analysis: Experiment, Theory, Applied Significance

This book examines picroilmenites and their ferromagnetic behavior in the kimberlites from the Yakut diamondiferous province. Picroilmenites are minerals used to identify the location of diamonds. The author shows a solid interpretation of the magnetic-mineralogical analysis of ferromagnetic minerals based on a large number of experimental data and modeling of the magnetic state. He also presents the problems of the variability of the composition of picroilmenites from various kimberlite pipes. Furthermore, this book proposes a method to estimate the distribution of the decay structures dimensions, according to the thermomagnetic analysis and coercive spectra of titanomagnetites with the magnetite-ulvospinel decomposition structures. This book will be useful for students and researchers working in the field of rock magnetism, as well as geologists and geophysicists.9

MINERAL COMPOSITION OF SABAKTY LAKE SEDIMENTS

In this study, we present lithology, mineralogy and scanning electron microscopy observations along a 294 cm sediment profile of the Lake Sabakty, with the objectives of understanding the geochemical processes and improving the paleohydrological and paleoecological information during the late Pleistocene and Holocene of the South Ural.23-2

Lacustrine sediments variability on the base of magnetic properties of lake Kandrykul

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Holocene paleoclimate history of Lake Bannoe (South Ural), from magnetic, geochemical investigation, and grain‐size characteristics

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Paleomagnetic study of impactites from the Karla impact structure suggests protracted postimpact hydrothermalism

International audienceWe present a paleomagnetic study of the ~10 km diameter Karla impact structure in Russia. We sampled the target carbonate rocks, and a yet undocumented fragmental melt-bearing lithic breccia layer. This impact breccia, which contains carbonate melt, is enriched in stoichiometric magnetite by a factor of ~15 compared to the target lithologies, and carries a stable natural remanent magnetization. The weak remanent magnetization and the presence of both normal and reverse polarities down to the centimeter scale indicate that the breccia does not carry a thermoremanent magnetization (TRM), but rather a chemical remanent magnetization (CRM). The presence of stoichiometric magnetite and the absence of TRM suggest that the magnetite was formed during relatively low-temperature postimpact hydrothermalism that affected the porous impact breccia layer. During this process, the breccia acquired a CRM. The paleomagnetic direction is compatible with a Cenozoic age for the impact event, but cannot bring more precise constraint on the age because of the stable position of the Eurasian plate over the last 60 Myr. However, the presence of both polarities indicates that mild hydrothermalism took place over a period of time long enough to span at least one reversal of the geomagnetic field, that is, over a time scale of the order of 100 kyr. This confirms that protracted hydrothermal systems associated with impact craters are long lived, even in relatively small craters such as Karla, and are key features of the geologic and environmental effects of impacts on Earth

Complex investigation of Lake Bannoe sediments (South Ural, Russia)

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