Pyrites are widely distributed in marine sediments, the morphology of which is applied as a proxy to infer redox conditions bottom water, and identify diagenetic stages hydrocarbon leakage activities. In this review, methods used for morphological study pyrite summarized. The textural size characteristics euhedral aggregates, formation evolution mechanism discussed their significance reconstruc...

Sedimentary and hydrothermal pyrites contained in selected Malaysian black shale cherts have been analysed using laser ablation inductively coupled plasma (LA ICP-MS) electron probe microanalysis (EPMA) at the University of Tasmania, Australia. This study shows that gold is concentrated sedimentary pyrite Middle Permian to Late Triassic shales Devonian cherts. According LA ICP-MS analysis, cont...

BACKGROUND Bacteria have developed different mechanisms for the transformation of metalloid oxyanions to non-toxic chemical forms. A number of bacterial isolates so far obtained in axenic culture has shown the ability to bioreduce selenite and tellurite to the elemental state in different conditions along with the formation of nanoparticles-both inside and outside the cells-characterized by a v...

The first major mass extinction of trilobites occurred at the transition from Cambrian Series 2 (CS2) to Miaolingian (M) and coincided with a large marine transgression volcanic eruptions igneous province (LIP). Understanding causal links between these events is important in deciphering environmental changes life evolution that time. This paper presents S-Hg-C isotopic Fe speciation data for ca...

kajal kaolin deposit is located ~20 km northwest of hashtjin, ardebil province. field evidence and laboratory investigations show that the deposit is an alteration product of ignimbrites, tuffs, and trachy-andesites of eocene age. according to mineralogical data, the major rock-forming minerals include kaolinite, montmorillonite, polygorskite, orthoclase, zeolite (stilbite), quartz, and chalced...

Geochemical characteristics of precipitated fracture filling calcite and pyrite can provide much useful information about the deep bedrock environment at time their deposition. However, it has been difficult to identify coatings from present-day groundwater system. The aim this study was evaluate relationship between coexisting pyrite, present precipitation. Here we investigated fine-grained mi...

Nature of the Accident Tin is manufactured on a very large scale in Bootle. It occurs naturally as pyrites, and arsenic is an invariable contaminant. The chemical composition of the ores varies considerably but arsenic is present in a concentration of up to 3 %. The tin is liberated from its ores by heating with carbon. The arsenical impurities float to the surface of the molten tin and form a ...

The Western Qinling orogenic belt (WQOB) is one of the most important prospective gold districts in China, with widely distributed Indosinian intermediate–acidic intrusions. Liziyuan Au deposit a representative northern WQOB, hosting several sections spatially associated igneous rocks. hosted by meta-sedimentary volcanic rocks Cambrian–Ordovician Group and Tianzishan monzogranite. Two periods, ...