Thioarsenates are common arsenic species in sulfidic geothermal waters, yet little is known about their biogeochemical traits. In the present study, a novel sulfate-reducing bacterial strain Desulfotomaculum TC-1 was isolated from a sulfidic hot spring in Tengchong geothermal area, Yunnan Province, China. The arxA gene, encoding anaerobic arsenite oxidase, was successfully amplified from the ge...

The Paraíba is an Au-Cu-Mo deposit located in the southern part of Amazon Craton, Alta Floresta Mineral Province, Mato Grosso State, Brazil. It composed Au-Cu-bearing quartz veins and Cu-Mo-rich hydrothermal breccias stockworks, both associated with several alteration zones. integration spectral (reflectance imaging spectroscopy) conventional techniques (core logging, petrography, mineral chemi...

The end-Permian mass extinction, ∼252 million years ago, is notable for a complex recovery period of ∼5 Myr. Widespread euxinic (anoxic and sulfidic) oceanic conditions have been proposed as both extinction mechanism and explanation for the protracted recovery period, yet the vertical distribution of anoxia in the water column and its temporal dynamics through this time period are poorly constr...

Quartz, carbonates and other minerals as e.g., realgar are present in veins caverns sedimentary rocks the Western Carpathians. In Polish segment, they have been characterized from mineralogical, petrologic, geochemical points of view, well fluid inclusions. Their characters discussed perspective a description particular types chaotic complexes—the tectonic mélange zones, distinguished Carpathia...

17 Nitrogen cycling has been evaluated across a depth transect in the late Paleoproterozoic 18 Animikie Basin, spanning the end of Earth’s final period of global iron precipitation and a major 19 transition to euxinic conditions in areas of high productivity. Sediments from near shore where 20 productivity was highest have N compositions up to ~3‰ higher than at more distal sites. 21 This sugg...

Intense biogeochemical transformations in sediments and biofilms may occur over sub-mm distances. Our current understanding of those such narrowly stratified environments has been facilitated by the introduction microsensors. Until now most studies have conducted using individual sensors for various chemical species, careful vertical alignment sensor tips is then essential meaningful interpreta...

New occurrences of free gold were identified during fieldwork at outcrops located in the western part of the Castro Basin, state of Paraná. These are associated with silicified and sulfide-rich zones in hydrothermally-altered volcanic rocks. The aerogeophysical data indicate that the areas of the new targets show high K and eU relative to eTh, suggesting intense hydrothermal alteration. The str...

Municipal solid waste used for landfill becomes stabilized, or aged, some years after placement, and can be safely excavated; the term 'mineralized refuse' is used in this study. The adsorptions of phosphorus, and the nitrification of the mineralized refuse and clay, were investigated by batch incubation. The variation of phosphorus adsorption in the mineralized refuse was fitted to the Freundl...

introduction the ramand area, southwest of buin- zahra, about 60 kilometers from qazvin, lies in the igneous belt of the urmieh-dokhtar region, the main structural zone of north-central iran. rhyodacite and rhyolite lava flows are the principal host rocks of mineralization and alteration of the area, most of which occurs in faulted and brecciated zones alongmaj or northwest-trending fault syste...