Abstract Sulfur (S) is an essential macronutrient and important component of the earth’s crust, its cycling has critical impacts on trace metal mobility, water quality, human health. Pyrite weathering primary pathway by which sulfur enters surface waters. However, biogeochemical in soils river corridor mediates sulfate exports. In this study, we identified major forms across multiple compartmen...

The Salobo iron oxide copper-gold (IOCG) deposit host an important Cu-mineralization of the Carajás Mineral Province. ore is characterized by association (bornite-chalcocite-digenite) hosted magnetite and biotite-garnet schists. These rocks record distinct stages superimposed hydrothermal alteration dynamic metamorphism. Three different occurrences constitute bodies: a pristine to inclusion-poo...

Soil is a key carbon reservoir balancing global budget and regulating climate change. Barren soils in karst zones have weak capacity for soil water conservation are readily erodible, making the biogeochemical processes within potentially rapid complex. To explore vertical variation of under conditions its response to land-use change, this study investigated concentrations isotopic compositions ...

Aiming to achieve silicon nitride (Si3N4) ceramics with high hardness and toughness, the relationships among phase composition, microstructure, mechanical properties of Si3N4 prepared by spark plasma sintering (SPS) at temperatures ranging from 1500 1800 ℃ were investigated in this study. Two stages different microstructure features observed summarize...

Cinnabar (α-HgS) is the most common sulfide of mercury while metacinnabar (β-HgS), a high-temperature homogeneous polymorph sulfide, relatively rare, and α phase cinnabar transforms to β at 344 °C. Meanwhile, there complete isomorphic series between HgS HgSe, occurrence Se-bearing great significance for exploration selenium resources. We studied through microscopic observation, electron-probe m...

Biogenic opal produced by vascular plants, diatoms, and siliceous sponges have been found in soils and terrestrial sediments of all continents except Antarctica since the middle of the 19th century. The opal particles range in size from fine silt to fine sand. Almost all soils contain detectable opal up to levels of 2–3%, and a significant number contain values in excess of 5%. Even higher valu...

Water plays a fundamental role in affecting geochemical transport and physical properties of magmas. Here we show the previously undocumented behavior of water within partially molten silicate resting in a temperature gradient, producing O, Li and H isotope redistribution by thermal diffusion leading to enrichment of light isotopes at the hot end of the gradient. After weeks to months, fully mo...

Sub-aerial biofilms (SAB) are ubiquitous, self-sufficient microbial ecosystems found on mineral surfaces at all altitudes and latitudes. SABs, which are the principal causes of weathering on exposed terrestrial surfaces, are characterized by patchy growth dominated by associations of algae, cyanobacteria, fungi and heterotrophic bacteria. A recently developed in vitro system to study colonizati...

The magnitude and temperature-sensitivity of oxygen isotope fractionation in ferric oxide-water systems remain uncertain. In this study, three different synthetic methods are used to investigate the temperature dependence of the fractionation between water and hematite, akaganeite, and goethite at near-surface temperatures. Our results reveal two similarities among these ferric oxide-water syst...

Pneumococcus extracts highly active in inducing the in vitro transformation of the specific types of Pneumococcus have been prepared by dissolving S cells with sodium desoxycholate, precipitating the dissolved material in alcohol in which the bile salt remains soluble, and extracting the precipitate in salt solution. Further purification of these active extracts has been attained by the removal...