The C 1 coal of Latest Permian during mass extinction in eastern Yunnan was studied to reveal the terrestrial paleoenvironment and influence geological events on coal-formation extinction. An analysis Rare Earth Elements (REEs) conducted from Yantang Mine Xuanwei, Province, which deposited latest Permian. A total 24 samples coals, partings, roofs floors were taken fresh face underground mine. r...

The southern Apennines (Italy) chain is a fold-and-thrust belt mainly derived from the deformation of African–Apulian passive margin where shallow-water, basinal, and shelf-margin facies successions, including fine-grained sediments, occur. Here, we provide review geochemistry Meso–Cenozoic shales Lagonegro basin to elucidate provenance paleoweathering. different suites these are dominated by 2...

• Two stages of fluid exsolution are recognized in the Weijia W skarn deposit. F-rich magmatic fluids enriched REEs, Y, Nb, Ta with flat REE patterns. F consumption is critical for compositional evolution mineralizing fluids. Combined garnet and scheelite trace elements powerful tracking mineralization. Fluid an essential subject studies hydrothermal ore-forming processes. Garnet prevail W-bear...

Introduction: Mantle derived peridotite xenoliths ranging in modal composition between fertile lherzolites and modally metasomatized harzburgites has been analyzed by instrumental neutron activation analysis (INAA) for As, Sb and REE. In many melt depleted mantle samples (harzburgites) the incompatible element concentrations are much higher than those estimated for the fertile mantle. The reaso...

Rare earth elements (REE) are powerful tracers for our understanding of sedimentary provenance and depositional processes. This study investigated geochemical characteristics REE in 226 sediment samples collected from the piedmont, central littoral plains North China Plain. Results showed that total concentrations exhibited a decreasing trend as piedmont > littoral, 82%, 70% 67% had higher than...

The Ahetala granodiorite is located in the western section of South Tianshan Orogenic Belt (STOB), which great significance regarding dispute on closing date Ocean (STO) and tectonic evolution STOB. To determine setting petrogenesis, study petrography, electron probe microanalysis (EPMA), LA-ICP-MS zircon U–Pb geochronology, major trace elements analyses are carried out for granodiorite. Based ...

Ion microprobe analyses of oxygen isotope ratios in Early Archean (Hadean) zircons (4.0to 4.4-Ga) reveal variable magmatic O values, including some that are high relative to the mantle, suggesting interaction between magmas and already-formed continental crust during the first 500 million yr of Earth’s history. The high average O value of these zircons is confirmed by conventional analysis. A m...

Rainwater and snow collected from three different sites in France (Vosges Mountains, French Alps and Strasbourg) show more or less similar shapes of their REE distribution patterns. Rainwater from Strasbourg is the most REE enriched sample, whereas precipitations from the two mountainous, less polluted catchments are less REE enriched and have concentrations close to seawater. They are all stro...

The Cocos Ridge, which is subducted beneath the Central American Volcanic Arc, has a complex tectonic evolution history due to plume-ridge interaction between Galápagos plume and Cocos—Nazca spreading center. This study presents major trace element analyses of plagioclase clinopyroxenes hosted by Ridge basaltic rocks that were drilled in three holes (U1381A, U1381C U1414A) Sites U1381 U1414 on ...

Concentrations of the incompatible trace elements and REEs in the upper mantle rocks of the Northern Semail ophiolite are very low, as typical in the residua of partial melting and in the early products of a fractionating magma. However, their geochemical characteristics have shown indications of hydrous magmas that more likely related to a subduction environment. Melt extraction can play a cru...