The relationship of sedimentary organic matter, oil-gas and sandstone-type uranium (U) deposits is the key problem U-mineralization. Whether migrate hydrocarbons participate in U-mineralization still a controversy. Typical U Erlian Basin northeast China have been investigated through detailed petrography, mineralogical, micro spectroscopic, geochemical C-isotope studies. Petrographic observatio...

Several gold ore-concentrated areas have been recognized in the destruction zone of North China Craton (NCC). However, deposits western part received less attention. Miaoan, a typical Au-polymetallic deposit northern Taihang Mountain, provides good sample for deepening our understanding genesis zone. In this study, detailed ore geology, pyrite Rb-Sr age, trace element and S-C-O isotopes Au-bear...

This report presents the chemical and physical factors governing the generation of sulfur dioxide (SO2), its transformation into other sulfur compounds, and the removal of sulfur oxides within the cement kiln system. Sulfur in cement kilns is derived from both kiln feed and from the kiln fuel. The form of the sulfur dictates the location in the kiln where the SO2 generation takes place. Sulfur ...

Abrupt disappearance of mass-independent fractionation of sulfur isotopes (MIF-S) from the geologic record and an apparent ingrowth in seawater sulfate around 2.45 billion years ago (Ga) signal the first large-scale oxygenation of the atmosphere [the Great Oxygenation Event (GOE)]. Pre-GOE O2 production is evident from multiple other terrestrial and marine proxies, but oceanic O2 concentrations...

Exceptionally preserved fossil biotas of the Burgess Shale and a handful of other similar Cambrian deposits provide rare but critical insights into the early diversification of animals. The extraordinary preservation of labile tissues in these geographically widespread but temporally restricted soft-bodied fossil assemblages has remained enigmatic since Walcott's initial discovery in 1909. Here...

The Fenton reaction is the most widely used advanced oxidation process (AOP) for wastewater treatment. This study reports on the use of pyrite nanoparticles and microparticles as Fenton reagents for the oxidative degradation of copper phthalocyanine (CuPc) as a representative contaminant. Upon oxidative dissolution in water, pyrite (FeS2) particles can generate H2O2 at their surface while simul...

The geochemistry of rare earth elements and yttrium (REY) in phosphorite has been widely studied. However, the effect organic matter on REY enrichment not well determined. We utilized paired inorganic (δ13Ccarb) carbon isotopes, total (TOC), content (∑REY) Zhijin Motianchong (MTC) compared them with those Meishucun (MSC) to reveal REY. δ13Ccarb MTC area (≈0‰) is heavier than that MSC (−5.23‰ −1...

Iron isotope compositions (expressed as δ56Fe) in sedimentary pyrite have been widely used tracers of redox and chemical evolution the ocean through geological time. Previous studies mostly built on mechanical extraction sulfides from bulk rock samples, focused visible macroscopic pyrites, which may introduce a sampling bias. In situ analyses micropyrite grains can provide new insights into pro...

Several orogenic/sediment-hosted gold deposits are widely distributed in the Central Belt of Peninsular Malaysia. This study combines U-Pb dating with isotope composition lead as well content ore and magmatic rock-hosted pyrite. It aims to investigate age mineralization possibly establish a link between intrusion district. The results show that S-type rocks yield crystallisation ages ranging fr...