47 The interpretation of the Cretaceous-Paleogene (K-Pg) iridium anomaly – and other 48 impact ejecta – as the result of a single, large asteroid impact has been the subject of much 49 debate, in part due to the distribution of impact markers beyond the narrow confines of the K-Pg 50 boundary sedimentary layer. Here, we revisit the hypothesized processes leading to the shape of 51 K-Pg iridium ...

[1] We model Pn waveforms from two earthquakes in the southwestern United States (Mammoth Lakes, California, and western Nevada) to determine a velocity model of the crustal and mantle structure beneath the southern Sierra Nevada and Walker Lane. We derive a one-dimensional velocity model that includes a smooth crust-mantle transition east of Death Valley and extending south into the eastern Mo...

Geological observations that constrain the history of mantle convection are sparse despite its importance in determining vertical and horizontal plate motions, plate rheology, and magmatism. We use a suite of geological and geophysical observations from the northern North Sea to constrain evolution of the incipient Paleocene-Eocene Icelandic plume. Well data and a three-dimensional seismic surv...

Hydrothermal processes in the Earth’s crust can result in ore deposits characterized by high concentrations of metals with fractal or multifractal properties. This paper shows that stream sediments in the neighborhoods of ore deposits also can have singular properties for ore-mineral and associated toxic trace elements. We propose a new local singularity mapping method for assembling element co...

Rare earth mine tailing dumps are environmental hazards because tailing easily leaches and erodes by water and wind. To assess the influence of mine tailing on the geochemical behavior of rare earth elements (REEs) in soil, sixty-seven surface soil samples and three soil profile samples were collected from different locations near China's largest rare earth mine tailing. The total concentration...

Economic rare earth element bearing-heavy mineral accommodation in alluvial deposits (stream sediments) is a well-known process caused by varying rates of weathering and transportation heavy minerals sediments, which significant geochemical exploration. In the present work, stream sediment samples from Wadi Lethi, Sharm El-Sheikh, were systematically collected. The collected sediments investiga...

objective: the present study aimed at investigating the relationship between attachment styles and self-efficacy in blind and non-blind female high school students in tehran. methods: the statistical population consisted of all female students studying in grades one or two in tehran girl’s high schools, in the academic year 2014. the study design was causal-comparative, conducted on 120 subject...

Congenital bronchial atresia (CBA) is a rare airway anomaly resulting in termination of a bronchus into a blind pouch with associated mucoid impaction and segmental hyperinflation. The etiology of CBA is related to vascular insufficiency to the bronchial bud during embryologic development. Controversy exists regarding the best approach to treatment for CBA and relating symptoms to the presence ...

background: teachers, parents and foundations should become objective-oriented for children with visual impairment so that learning and sensitization of necessary knowledge and skills for the behaviors of these children are assisted. where there is impairment in the relations of children caregivers, their emotional security is disturbed and its effects will appear in their behaviors. therefore,...

The Xiadian active fault is one of the most important seismological faults in vicinity Beijing-Tianjin-Hebei region. This paper mainly focuses on geochemical characteristics to unveil and evaluate its activity. Via application soil gaseous radon measurement, a detailed field study at Qixinzhuang segment proposed. Based all impulse value we acquired 3 profiles area. We plotted trend chart profil...