نتایج جستجو برای: geochemical anomalies

تعداد نتایج: 57431  

2011
Chaosheng Zhang Ya Tang Xianli Xu Ger Kiely

It is challenging to perform spatial geochemical modelling due to the spatial heterogeneity features of geochemical variables. Meanwhile, high quality geochemical maps are needed for better environmental management. Soil organic C (SOC) distribution maps are required for improvements in soil management and for the estimation of C stocks at regional scales. This study investigates the use of a g...

Journal: :Environmental science & technology 2006
M W Fields C E Bagwell S L Carroll T Yan X Liu D B Watson P M Jardine C S Criddle T C Hazen J Zhou

Few studies have demonstrated changes in community structure along a contaminant plume in terms of phylogenetic, functional, and geochemical changes, and such studies are essential to understand how a microbial ecosystem responds to perturbations. Clonal libraries of multiple genes (SSU rDNA, nirK, nirS, amoA, pmoA, and dsrAB) were analyzed from groundwater samples (n = 6) that varied in contam...

2002
W. W. Shilts

and Vagners (1971, 1972) expressed this phenomenon elegantly by introducing the concept of "terminal mode" for the optimum grain size to which a mineral can be reduced, given the force and energy typically available in the glacial environment. Thus, hard, uncleaved or poorly cleaved minerals such as quartz, fcldspar, garnet, pyrite and magnetite dominate either the medium or the fine sand fract...

2017
Christophe Thomazo Jean-Francois Buoncristiani Emmanuelle Vennin Pierre Pellenard Theophile Cocquerez Jean L. Mugnier Emmanuelle Gérard

Citation: Thomazo C, Buoncristiani J-F, Vennin E, Pellenard P, Cocquerez T, Mugnier JL and Gérard E (2017) Geochemical Processes Leading to the Precipitation of Subglacial Carbonate Crusts at Bossons Glacier, Mont Blanc Massif (French Alps). Front. Earth Sci. 5:70. doi: 10.3389/feart.2017.00070 Geochemical Processes Leading to the Precipitation of Subglacial Carbonate Crusts at Bossons Glacier,...

Journal: :Minerals 2023

The Korean Peninsula mainly comprises the Paleoproterozoic Gwanmo, Nangnim, Gyeonggi, and Yeongnam massifs from north to south. basement is rarely exposed in Paleozoic Taebaeksan basin, which located northeastern part of Okcheon belt between Gyeonggi massifs. One most important issues tectonic interpretation whether rocks basin have an affinity with those or To solve this problem, we focused on...

Journal: :Petrology 2021

Abstract We conducted the geochemical modeling of trace element contents for primary melts olivine-phyric rocks from Kamchatsky Mys. This reveals substantial chemical heterogeneity their source while average composition is close to enriched DMM (E-DMM). The estimation melting degree in range 9.1 ± 3.8% model modal batch 15.4 5.2% accumulated fractional melting, which slightly higher than primit...

2008
S. Sestak P. F. Greenwood

Is UV laser ablation a suitable tool for geochemical analysis of organic rich source materials? Conference Item How to cite: Sestak, Stephen; Watson, Jonathan S.; Sherlock, Sarah; Greenwood, Paul F. and Fuentes, David (2008). Is UV laser ablation a suitable tool for geochemical analysis of organic rich source materials? In: 15th Australian Organic Geochemistry Conference, 8-12 September, Adelaide.

Journal: :Geochemistry 2021

Geochemical investigations of till is a widely used method in metal exploration as the commonly inherits geochemical signature (including contents) parent bedrock. In this investigation, over 2000 samples were collected Sarvlaxviken area, southern Finland, where several polymetallic (Cu, Zn, Pb, As, Sn, W and In) veins recently have been discovered Proterozoic crust along border between Late Sv...

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