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  • Geochemical indices and palynology comparison used

     · (TOC) content and other elements including major elements trace elements and rare earth elements (REEs) were identified and also established as proxies using a geochemical analysis study. 3.1 Petrographic analysis The standard palynological method was used for a petrographic study following Albani et al. (2006) of spiking

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  • A new middle Cambrian radiodont from North China

     · The Cambrian Miaolingian Zhangxia (=Changhia) Formation is widely distributed in North China and is well exposed in Shandong Province. This formation is bounded by intervals of oolitic limestone at the top and the bottom the most representative lithofacies defining the Zhangxia Formation (Zhang 1996).At its type section Mantoushan the Zhangxia Formation is 200.4 m thick and almost

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  • In situ trace element and sulfur isotope of pyrite

    The effects of post-ore metamorphism and deformation on trace element concentrations in sulfides have recently received increasing attention. In this study we report comprehensive petrographic observations combined with laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) trace element analysis data of pyrite sphalerite and chalcopyrite to evaluate the influence of

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  • State of rare earth elements in different environmental

    Element La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Th Yb Lu Abundance (ppm) 30 64 7.1 26 na 4.5 0.88 3.8 0.64 3.5 0.80 2.3 0.33 2.2 0.32 Table 2 Concentrations of REEs in soil samples in REE mining areas

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  • Mineralogical petrographical geochemical diageneses

     · ated using major -trace and -rare earth element (REE) data weathering indices elemental ratios and other geochemical indicators. To achieve this goal 12 samples from the middle member of the Duwi Formation were selected to represent the black shales in the studied area. The chosen area is

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  • Status of Marine Biodiversity of the China Seas

     · China s seas cover nearly 5 million square kilometers extending from the tropical to the temperate climate zones and bordering on 32 000 km of coastline including islands. Comprehensive systematic study of the marine biodiversity within this region began in the early 1950s with the establishment of the Qingdao Marine Biological Laboratory of the Chinese Academy of Sciences.

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  • Sulfur isotope and trace element compositions of pyrite

     · The Shuiyindong Carlin-like gold deposit the largest one of this type in China is located in the Late Paleozoic–Early Mesozoic Youjiang basin. The pyrites in the studied ore bodies (No. I to V) can be divided into four main types plus several sub-types (1) As-poor pyrites include Py1 (Py1a and Py1b) Py2 and Py3 and (2) As-rich pyrite Py4 (Py4a and Py4b). In situ LA-ICP-MS analyses show

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  • Frontiers The Distribution and Origins of Pyrus

     · Introduction. Pyrus hopeiensis (2n = 34) belonging to Pyrus is a rare wild resource of the genus that is unique to China is distributed in the provinces of Hebei and Shandong. Because of its limited distribution and population declines P. hopeiensis has been classified as "the wild plants with tiny population" (Li et al. 2018) that urgently requires protection.

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  • Distribution of rare earth elements in an alluvial aquifer

     · Distribution of rare earth elements in anionic cationic and particulate fractions in boreal humus-rich streams affected by acid sulphate soils. Astrom M Corin N Water Res (2) 2003

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  • hebeu

     · 2015 1Occurrence of some valuable elements in the unique high-aluminium Coals" from the Jungar coalfield China2015Ore Geology ReviewsSCI

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  • Petrography and geochemistry of the Lower Silurian

     · Rare earth elements. Sedimentary rocks in the Angzanggou Formation are rich in rare earth elements (∑REE) with a concentration range of 34.76–248.97 μg/g and an average of 152.62 μg/g (Table 3). Most samples have higher ∑REE than UCC (146 μg/g Taylor McLennan Reference Taylor and McLennan 1985) (Table 3). The ratio of light rare

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  • Geochemical studies of the Nanxiaoyao gold deposit in

     · The Nanxiaoyao gold deposit is located in the middle part of the central Yishu fault zone in Shandong Province Eastern China. In this study we examined its genesis based on detailed in-situ LA-ICP-MS analyses of pyrite trace element contents sulfide (pyrite and galena) sulfur isotopes and fluid inclusion (FI) He–Ar isotopes of the ore-related pyrite.

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  •  · Geo-statistical and multivariate analyses of potentially toxic elements distribution in the soil of Hainan Island (China) A comparison between the topsoil and subsoil at a regional scale Geological Magazine 2.341

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  • China Rare Earth Industry Report

     · •Rare Earth Classification • Rare Earth Industry Chain • Rare Earth Ore Classification • Global Distribution of Rare Earth Reserves 2014 • Overseas Rare Earth Mine Development Projects 2014 • Overview of Major Overseas Rare Earth Mine Development Projects • Global Rare Earth Output by Region 2009- 2014 • Global Rare Earth Supply Pattern 2015 • Global Rare Earth

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  • China Rare Earth Industry Report

     · China s rare earth industry has been facing quite a few challenges like low enterprise concentration and scattered layout. In 2014 Inner Mongolia Baotou Steel Rare-earth which represents the largest market share generated revenue that accounted for a meager 7.1 of the total nationwide. Global Distribution of Rare Earth Reserves 2014

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  • The Distribution and Composition Characteristics of

    The Qinzhou Bay-Hangzhou Bay joint belt is a significant tectonic zone between the Yangtze and Cathaysian plates where plentiful hydrothermal siliceous rocks are generated. Here the authors studied the distribution of the siliceous rocks in the whole tectonic zone which indicated that the tensional setting was facilitating the development of siliceous rocks of hydrothermal genesis.

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  • Thermodynamics of rare-scattered element In 3

    Thermodynamics of rare-scattered element In 3 adsorption by nanometer titanium oxide The pH dependency on the distribution ratio was found to be affected by the valency of the metal ion and

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  • Analysis of the variation in potential evapotranspiration

     · The third is scattered around December with a strong concentration in the time domain in the range of 6–12. Figure 3 Wavelet transform 3D Bars and real part time–frequency distribution

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  • Sun Yat-sen University

    19639 . 1990 1990.071992.10 1992.111998.02 1998.021998.08 Dept. of Geology NMT USA

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  • (PDF) Petrography and Sulphur Isotope Studies of Pyrites

    Abstract and Figures. Problem statement The Muteh mining district is located in 70 km northeast of Golpaygan city within the Sanandaj-Sirjan metamorphic belt. There are 2 gold mines 7 gold

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  • Donkey genomes provide new insights into domestication

     · A new donkey reference genome and comparisons with wild asses yields insights into the evolutionary history of donkey domestication and identifies a genetic variant that results in the non-Dun

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  • Rare Earth Element and Trace Element Features of Gold

    Jinshan gold deposit is located in northeastern Jiangxi South China which is related to the ductile shear zone. It has a gold reserve of more than 200 tons with 80 of gold occurring in pyrite. The σREE of gold-bearing pyrite is as higher as 171.664 ppm on average with relatively higher light rare earth elements (LREE 159.556 ppm) and lower HREE (12.108 ppm).

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  • (PDF) Source and Enrichment of Toxic Elements in Coal

     · Source and Enrichment of Toxic Elements in Coal Seams around Mafic Intrusions Constraints from Pyrites in the Yuandian Coal Mine in Anhui Eastern China April 2018 Minerals 8(4) 164

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  • Spatial-temporal distribution characteristics and

    The directional distribution represents the degree of dispersion and orientation of the data (Wang et al. 2015a 2015b). It is widely used to reveal the spatial distribution of geographical elements (Long et al. 2018) such as protected areas (Fan et al. 2020) homestays (Long et al. 2018) etc.

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  • Gold and arsenic in pyrite Geology and gold on Otago s

     · The images below show the distribution of gold and arsenic in a pyrite grain. There is clear zonation of gold and arsenic following the broadly concentric shape of crystal growth zones seen under the microscope. In addition W Ni Co and Bi are also weakly enriched in the Macraes pyrite also with concentric zonation.

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  • Influence of Dysprosium Distribution on Properties of

     · The results indicate that Dy element is mainly distributed in the Nd-rich phase Nd-Dy oxides and Dy-rich particles located at the grain boundaries of the sintered magnets in addition to the main crystal phase Nd 2 Fe 14 B. The optimized aging process is beneficial to promote a reasonable diffusion and distribution of Dy element.

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  • Abstractbmpg.ac.cn

    REE and HFSE Geochemical Characteristics of Pyrites in Yao an Gold Deposit Tracing Ore Forming Fluid Signatures. BI Xian-wu HU Rui-zhong PENG Jian-tang WU Kai-xin. Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China. Abstract

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  • Valuable elements in Chinese coals a review Request PDF

    Dingcheng Liang. Junya Cao. In this study a high-sulfur and high-ash yield coal sample obtained from the Yanshan coalfield in Yunnan China was analyzed. A series of char samples was obtained by

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  • State of rare earth elements in different environmental

    Element La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Th Yb Lu Abundance (ppm) 30 64 7.1 26 na 4.5 0.88 3.8 0.64 3.5 0.80 2.3 0.33 2.2 0.32 Table 2 Concentrations of REEs

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  • Process mineralogy of Weishan rare earth ore by MLA

     · Mineral liberation analyser (MLA) was applied to quantitatively analyze the rare earth ore from Weishan in Shandong. Mineralogy parameters such as mineral composition occurrence states of rare earth elements (REEs) and valuable elements mineral embedded grain size distribution mineral association and liberation are obtained.

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  • Discovery of in-situ carbonate petrifactions (coal balls

     · The content of rare earths and actinides in these pyrites are age dependent and tend to be more highly concentrated in the younger seams. Pyritic oxidation in coal and resultant formation and dissolution of secondary sulfate minerals are one more » mechanism for trace-metal dispersion into the surface-water environment.

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  • Full Text Situation and Policies of China s Rare Earth

     · In ion-absorbed-type rare earth deposits the rare earth elements are absorbed in the soil in the form of ions making it difficult for industrial exploitation due to sparse distribution and low

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  • Revisit of rare earth element fractionation during

     · 3 Sampling and Methods 3.1 Sample Collection. The granodiorite-weathering profile locates at Xianyou County of Fujian Province (118°44.694′E 25°21.853′N) (Figure 1).The samples collected at this site in January 2014 have been previously analyzed for magnetic properties Su et al. 2015 .The profile thickness is around 8.7–9.2 m and the samples were collected at 10–30 cm intervals

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  • Concentrations of rare earth elements in topsoil from East

     · Fifty topsoil samples collected from 12 different regions of East China have been analyzed for rare earth elements (REEs). The average REE concentrations of the 50 topsoil samples are much higher than world average and are characterized by LREE-enrichment HREE-depletion Eu-depletion and Ce-enrichment. However the REE concentration is not strongly affected by the climate of the sampling

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  • Sun Yat-sen University

    19639 . 1990 1990.071992.10 1992.111998.02 1998.021998.08 Dept. of Geology NMT USA

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