This article reports new geochemical, Sr-Nd-Hf-Pb and Re-Os data on the rocks of Middle Paleoproterozoic (1.99 Ga) Tiksheozero ultramafic-alkaline-carbonatite complex confined to northeastern margin Karelian Craton. We focus poorly studied silicate rocks. Based petrographic geochemical research, are subdivided into two groups: an ultramafic-mafic series depleted in REE, other incompatible eleme...

Abstract The chemical composition of the wood reflects soil over which corresponding tree has developed. Multi-elemental and isotopic signatures, are characteristic underlying rock substrates, potentially powerful tools for determining provenance. These tracers special interest charred archaeological because they circumvent some limitations dendrochronological provenancing linked to tree-ring l...

The discovery of superconductivity in Nd${}_{1\ensuremath{-}x}$Sr${}_{x}$NiO${}_{2}$ has resulted a flurry experimental and theoretical work to understand the nature nickelate as compared that cuprates pnictides. Here, authors use combination LDA+U linear-response methods study magnetic exchange interactions Nd${}_{1\ensuremath{-}x}$Sr${}_{x}$NiO${}_{2}$. analysis reveals an underlying Mott ins...

The Pirrit Hills are located in the Ellsworth–Whitmore Mountains of West Antarctica. granite exhibits significant negative Eu anomalies (Eu/Eu* = 0.01~0.25) and a REE tetrad effect indicating intensive magmatic differentiation. Whole-rock Rb-Sr Sm-Nd geochronologic analysis gave respective ages 172.8 ± 2.4 Ma with initial 87Sr/86Sr 0.7065 0.0087 169 12 144Nd/143Nd 0.512207 0.000017. isotopic ra...

Haleakala volcano on East Maui, Hawaii, consists of a tholeiitic basalt shield which grades into a younger alkalic series that was followed by a post-erosional alkalic series. Fresh, stratigraphically controlled samples from the three volcanic series were analyzed for major element abundances, Sr and Nd isotopic ratios and trace element (K, Rb, Sr, Ba, Th, Ta, Nb, REE, Hf, Zr, Sc, V, Cr, Co, Ni...

A new numerical technique is proposed to study the stochastic resonance (SR) phenomenon. The proposed numerical approach allows to nd characteristics of SR faster than the previous ones. The signal-to-noise ratio and phase shifts for a system of noisy coupled oscillators are simulated. The spatiotemporal synchronization is shown by means of trajectory analysis.

The assumptions of conventional whole-rock and mineral isochron radioisotope dating were tested using a suite of radioisotopes from two Precambrian rocks. Amphibolite from the Beartooth Mountains of Wyoming shows evidence of thorough metamorphism by isochemical processes from andesite by an early Precambrian magma-intrusion event. A diabase sill, exposed within the wall of Grand Canyon at Bass ...

Rainwater and snow collected from three different sites in France (Vosges Mountains, French Alps and Strasbourg) show more or less similar shapes of their REE distribution patterns. Rainwater from Strasbourg is the most REE enriched sample, whereas precipitations from the two mountainous, less polluted catchments are less REE enriched and have concentrations close to seawater. They are all stro...