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Dissolved rare earth elements estimation of ion-absorption rare earth ores using reflectance spectroscopy in south Jiangxi province,China

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Journal of Rare Earths 2021年第10期39卷 1300-1310,I0005页

作者： Jingjing Dai denghong wang Zhenghui Chen Institute of Mineral Resources Chinese Academy of Geological SciencesBeijing 100037China Ministry of Natural Resources.Key Laboratory of Metallogeny and Mineral Assessment Beijing 100037China

Ion-absorption rare earth ores are an important mineral resource in ***,the unauthorized mining has become a serious problem,resulting in severe water pollution and the wastage of rare earth elements(REEs).Being able to estimate the concentration of dissolved REEs in water bodies near mines is essential for tackling this environmental ***,quantitative analyses of the contents of dissolved REEs are performed using laboratory-based techniques,which can be time consuming and *** reflectance is a rapid and cost-effective means of characterizing the chemical compositions of light-absorbing *** this study,reflectance spectroscopy was performed on dissolved REEs,and the correlation between their reflectance characteristics and REE content was determined.A total of 50 aqueous media samples collected in south Jiangxi Province and 25 laboratory-produced aqueous media samples were tested,and their reflectance spectra and REE contents were measured using reflectance spectroscopy and inductively coupled plasma mass spectrometry,***,the reflectance,differential reflectance,and absorption depth were analysed based on the REE *** diagnostic absorption features related to REEs are recognised in the visible and near-infrared wavelength regions,along with several smaller *** indicates that the results of the absorption depth analysis are in accordance with the absorption spectra characteristics of the REEs,with the R2 value being higher than *** intensity of each of the six absorption bands exhibits a linear correlation to the total REE ***,linear regressio n models can be derived for estimating the total concentration of REEs in aqueous media ***’s more,the detection limit for REEs is determined to be about 30μg/***,it can be concluded that reflectance spectroscopy is a suitable technique for estimating the concentration of dissolved REEs.

关键词： Rare earth elements Ion-absorption rare earth ores Spectroscopy Concentration Correlation analysis

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On Minerogenetic Series: The Third Discussion

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Acta Geologica Sinica(English Edition) 2020年第1期94卷 1-9页

作者： CHEN Yuchuan PEI Rongfu wang denghong MNR Key Laboratory of Metallogeny and Mineral Assessment Chinese Academy of Geological SciencesBeijing 100037China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China

The minerogenetic(or metallogenetic) series of mineral deposits(called minerogenetic series for short) is an academic idea(concept) of studying minerogenetic characteristics in mineral deposit geology. It uses the views of systematology and mobilism to study mineralizing processes and naturally occurring mineral deposit assemblages formed in various stages of geological development in specific tectonic environments. The minerogenetic series is also a natural classification of mineral deposits. There are five hierarchical orders in the classification, with the minerogenetic series as the basic order and the core. The first order includes three categories: minerogenetic series association, minerogenetic series type, and minerogenetic series group. The second is the minerogenetic series, which is decomposed into three orders, i.e. the third, fourth, and fifth orders. The third is the minerogenetic subseries, the fourth is mineral deposit models(types), and the fifth is mineral deposits. Minerogenetic series is comparable to a certain extent metallogenic systems both in the research content and in their own research content. The study of minerogenetic series has both great theoretical significance and practical value for mineral prospecting. However, the study is still in its initial stage and a further study remains to be conducted.

关键词： concept of minerogenetic series order theoretic and practicable significance

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The Ore-forming Mechanism of the Jiajika Pegmatite-Type Rare Metal Deposit in Western Sichuan Province:Evidence from Isotope Dating

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Acta Geologica Sinica(English Edition) 2013年第1期87卷 91-101页

作者： LI Jiankang wang denghong CHEN Yuchuan MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResoucesCAGS Colleage of Earth Science and Resources Chang'an University

Granitic pegmatites are commonly thought to form by fractional crystallization or by liquid immiscibility of granitic magma; however, these proposals are based mainly on analyses of fluid and melt inclusions. Here, we use the Jiajika pegmatite deposit, the largest spodumene deposit in Asia, as a case study to investigate ore forming processes using isotope dating. Dating of a single granite sample from the Jiajika deposit using multiple methods gave a zircon U-Pb SHRIMP age of 208.4 ~ 3.9 Ma, an 4~Ar/39Ar age for muscovite of 182.9 ~ 1.7 Ma, and an 4~Ar/39Ar age for biotite of 169.9 ＋ 1.6 Ma. Based on these dating results and the 4~Ar/39Ar age of muscovite from the Jiajika pegmatite, a temperature-time cooling track for the Jiajika granite was constructed using closure temperatures of the different isotope systems. This track indicates that the granite cooled over ^-40 m. y., with segregation of the pegmatite fluid from the granitic magma at a temperature of ~700~C. This result suggests that the Jiajika pegmatite formed not by fractional crystallization, but by segregation of an immiscible liquid from the granitic magma. When compared with fractional crystallization, the relatively early timing of segregation of an immiscible liquid from a granitic magma can prevent the precipitation of ore-forming elements during crystallization, and suggests that liquid immiscibility could be an important ore-forming process for rare metal pegmatities. We also conclude that isotope dating is a method that can potentially be used to determine the dominant ore-forming processes that occurred during the formation of granite-related ore deposits, and suggest that this method can be employed to determine the formation history of the W-Sn ore deposits found elsewhere within the Nanling Metallogenic Belt.

关键词： isotope dating liquid immiscibility in granitic magmas pegmatite Jiajika rare metal deposit

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A Preliminary Review of Metallogenic Regularity of Molybdenum Deposits in China

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Acta Geologica Sinica(English Edition) 2015年第3期89卷 972-1001页

作者： HUANG Fan LIU Xinxing wang denghong wang Chenghui MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological Sciences School of Earth Sciences and Resources China University of Geosciences Beijing

Molybdenum is one of the dominant minerals in China because of its rich *** recent years,outstanding breakthroughs have been made in molybdenum prospecting in China,and the distribution of molybdenum deposits in China is found to have a ＂planar pattern＂.In general,the molybdenum deposits are concentrated in eastern China,including the largest molybdenum reserves of Henan *** terms of the scale of molybdenum deposits,the identified resources of the superlarge deposits are the most important,which account for about 53% of the whole country,and those of the large deposits account for about 30%,those of the medium-sized deposits account for about 14%,those of the small-sized deposits,mine spots and mineralization account for about 3%.The molybdenum deposits are mainly classified as porphyry type,skarn type,hydrothermal（vein） type and sedimentary（metamorphic） type in genesis,and the identified resources of these types account for 85.75%,8.83%,2.79%and 2.63% of the total resources *** on the statistics of precise chronology data of molybdenites Re-Os,Mo-mineralization can be divided into 6 periods in Chinese geological history,which are Precambrian（〉800 Ma）,Cambrian-Silurian（540-415 Ma,Caledonian）,Devonian-Permian（400-290 Ma,Hecynian）,Triassic（260-200 Ma,Indosinian）,Jurassic-Cretaceous（195-70 Ma,Yanshanian） and Paleogene-Neogene（65-10 Ma,Himalayan）.Mo mineralization during the Yanshanian period is the strongest one,in which about 76.69% of the Chinese total identified resources was *** second is the Himalayan *** to spatial-temporal distribution characteristics of molybdenum deposits,the metallogenic regularity of molybdenum deposits was preliminarily summarized,and 41 level-Ⅲ molybdenum-forming belts,13 level-Ⅱ molybdenum-forming provinces and 4 level-Ⅰ molybdenum-forming domains were ascertained in the mainland of *** are 39 metallogenic series of and 60 sub-series of molybdenum deposits with molybdenum as the d

关键词： molybdenum deposits deposits type molybdenum-forming belt regional metaUogeny,tectonic evolution suggestion for prospecting

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Re-Os Isotopic Dating of a W-Be Polymetallic Deposit in the Southern Qinling Region, China

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Acta Geologica Sinica(English Edition) 2018年第1期92卷 414-415页

作者： DAI Hongzhang wang denghong wang Chenghui HUANG Fan Key Laboratory of Metallogeny and Mineral Resource Assessment Ministry of Land and ResourcesInstitute of Mineral Resource Chinese Academy of Geological Sciences

Objective In recent years, a series of tungsten prospecting breakthroughs have been made in the southern Qinling Mountains. Especially, a new deposit type with a scheelite -beryl-molybdenite assemblage in the Zhen＇an area of Shaanxi Province was firstly discovered. This deposit is currently in a detailed investigation stage, and no detailed study has been yet conducted. This work selected one molybdenite sample from the Be （W） ores in this deposit for Re-Os isotope measurements to define the time limit of tungsten and beryllium mineralization, and to further reveal the ore-forming geological setting of rare metals in the southern Qinling region.

关键词： Re-Os Isotopic Dating Re-Os Isotopic Dating of a W-Be Polymetallic Deposit the Southern Qinling Region

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Lithium-bearing Pegmatite Exploration in Western Altun,Xinjiang,using Remote-Sensing Technology

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Acta Geologica Sinica(English Edition) 2023年第2期97卷 681-694页

作者： JIANG Qi DAI Jingjing wang denghong wang Chenghui TIAN Shufang Key Laboratory of Metallogeny and Mineral Assessment Ministry of Natural ResourcesInstitute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China China University of Geosciences Beijing 100083China

Western Altun in Xinjiang is an important area,where lithium(Li)-bearing pegmatites have been found in recent ***,the complex terrain and harsh environment of western Altun exacerbates in prospecting for Li-bearing ***,remote-sensing techniques can be an effective means for prospecting Li-bearing *** this study,the fault information and lithologyical information in the region were obtained using the median-resolution remotesensing image Landsat-8,the radar image Sentinel-1 and hyperspectral data *** Landsat-8 data,the hydroxyl alteration information closely related to pegmatite in the region was extracted by principal component analysis,pseudoanomaly processing and other *** high spatial resolution remote-sensing data WorldView-2 and WorldView-3 short-wave infrared images were used and analyzed by principal component analysis(PCA),the band ratio method and multi-class machine learning(ML),combined with conventional thresholds specified the algorithms used to automatically extract Li-bearing pegmatite ***,the Li-bearing pegmatite exploration area was determined,based on a comprehensive analysis of the faults,hydroxyl alteration lithology and Li-bearing pegmatite *** investigations have verified that the distribution of pegmatites in the central part of the study area is consistent with that of Li-bearing pegmatites extracted in this *** study provides a new technique for prospecting Li-bearing pegmatites,which shows that remote-sensing technology possesses great potential for identifying lithium-bearing pegmatites,especially in areas that are not readily accessible.

关键词： remote sensing prospecting multi-class machine learning Li-bearing pegmatites western Altun

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A Preliminary Review of Metallogenic Regularity of Silver Deposits in China

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Acta Geologica Sinica(English Edition) 2015年第3期89卷 1002-1020页

作者： JIANG Biao ZHANG Daquan wang denghong wang Chenghui CHEN Yuchuan BAI Ge Institute of Mineral Resources Chinese Academy of Geological Sciences China Geological Survey Chinese Academy of Geological Sciences

China has widely distributed silver deposits,and is rich in silver *** silver deposits are mainly associated with Pb-Zn deposits,a number of independent silver deposits have also been discovered in recent *** deposits include different types,such as submarine volcanism and continental volcanism related type,intrusion related type,and sedimentary related *** study summarized the metallogenic regularity of China＇s silver deposits systematically based mainly on the data from 490 silver *** is shown that submarine volcanic sedimentary type,continental volcanic or sub-volcanic type,skarn type,hydrothermal type（including vein type and stratabound type）,sedimentary metamorphic type,sedimentary type and regolith type should be regarded as the most important prediction types of silver deposit.A total of 32 silver mineralization belts and 111 silver concentration areas have been *** map of ＂Spatial distribution of silver mineralization belts in China＂ and other series of maps finished in this study may provide a theoretical basis for the evaluation and prognosis of silver resources potential in China.

关键词： silver deposit resource characteristics silver deposit types silver mineralization belts,temporal and spatial distribution minerogenic series of silver deposits

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The Metallogenetic Regularities of Lithium Deposits in China

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Acta Geologica Sinica(English Edition) 2015年第2期89卷 652-670页

作者： LI Jiankang ZOU Tianren LIU Xifang wang denghong DING Xin Key Laboratory of Metallogeny and Mineral Resource Assessment Institute of Mineral ResourcesChinese Academy of Geological Sciences China University of Geosciences

Lithium resources support the development of high-technology industries. China has abundant lithium resources which are mainly distributed in Tibet, Qinghai, Sichuan and Jiangxi. Salt lakes in China have significant lithium reserves, but lithium is mainly produced from hard rock lithium deposits because the extraction from salt lakes requires further improvements. The hard rock lithium deposits mainly occur in granitic pegmatite in the Altay region of Xinjiang and the Jiajika deposit in western Sichuan Province; they mainly formed in the Mesozoic and occurred in a relatively stable stage during orogenic processes. On the basis of the information from 151 lithium deposits or spots, 14 lithium metallogenic series were identified, and granitic pegmatite, granite, and sedimentary types were considered to be the main prediction types of lithium resources. Twelve lithium mineralization belts were divided and a series of maps showing the lithium metallogenetic regularity in China were drawn. We conclude that the hard rock and brine type of lithium resources possibly have a similar lithium source related to magmatism. The mctallogenic features of the lithium in China were related with the distinct history of tectonic-magmatic activity in China. This study benefits the assessment of, and prospecting for, lithium resources in China.

关键词： lithium deposit prediction type of lithium resources metallogenetic regularity metallogenic series pegmatite

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Time Sequence of Himalayan Endogenetic Mineralization on the East Side of the Qinghai-Tibet Plateau

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Acta Geologica Sinica(English Edition) 2000年第3期74卷 447-451页

作者： LUO Junlie CHEN Yuchuan wang denghong Yunnan Bureau of Geology and Mineral Exploration and Development Kunming 650011Yunnan Chinese Academy of Geological Sciences(CAGS) Beijing 100037 3.Institute of Mineral ResourcesCAGSBeijing 100037

Among the endogenetic deposits in the Sanjiang area and at the west margin of the Yangtze platform, Himalayan deposits are the most important and contribute a large proportion of the resources of superlarge deposits. Among the controlled resources of this region, 84% of copper resources, 67% of Pb-Zn, 31% of Ag, 77% of gold and 24% of tin come from Himalayan deposits on the east side of the Qinghai-Tibet plateau. Himalayan endogenetic mineralization shows a relatively complete sequence evolution in the Sanjiang area and on the west margin of the Yangtze platform. Mineralization is manifested by gold deposits related to K-rich lamprophyre, REE deposits related to alkalic complexes and Cu-Au-polymetallic deposits related to alkaline porphyry. Six sequences of mineralization evolution since 65 Ma B.P. in the Sanjiang area and on the west side of the Yangtze platform can be recognized. Himalayan endogenetic mineralization on the east side of the Qinghai-Tibet plateau reached its peak before the Oligocene, corresponding to episodes I and II of the intracontinental orogenic cycle. Afterwards, mineralization waned obviously.

关键词： time sequence Himalayan endogenetic deposits Qinghai-Tibet plateau

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A Preliminary Review of Metallogenic Regularity of Tin Deposits in China

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Acta Geologica Sinica(English Edition) 2015年第3期89卷 1021-1035页

作者： CHEN Zhenghui SHENG Jifu LIU Lijun wang denghong LIANG Ting wang Chenghui Key Laboratory of Metallogeny and Mineral Resource Assessment Institute of Mineral ResourcesChinese Academy of Geological Sciences China University of Geosciences Key Laboratory of Western China's Mineral Resources and Geological Engineering Ministry of EducationEarth Science and Resources College of Chang'an University

China is rich in tin resources,and contains many types of tin *** the tin deposit types,the cassiterite-sulfide type,skarn type and quartz vein type occupy a large proportion of tin resources and *** the aspect of exploitation and utilization,the most important types are cassiterite-sulfide type and quartz vein *** cassiterite-sulfide type tin deposits are mainly located in Northern Guangxi and Eastern Yunnan,skarn type deposits are mainly distributed in the ore-concentration areas of South Hunan in Middle Nanling,and the quartz vein type tin deposits are mainly distributed in South China,such as Western Fujian,Middle Jiangxi,Northern Guangzhou and Southern *** most important metallogenic epoch for tin deposits is the Mesozoic *** metallogenic geotectonic background is mainly continental environments after orogeny process,with strong tectonic changes,interlaced deep fracture and frequent *** the most distinctive feature is the well developed Mesozoic granites,which have a close relationship with tin *** on the detailed study of the data from 873 tin deposits in China,this paper summarized the metallogenic regularity of tin deposits,classified 20 important metallogenic series of tin or tin-associated deposits,and inferred that the cassiterite-sulfide type,skarn type,quartz vein type and greisen type are the main prediction types of tin ***-four tin-mineralization belts were divided,among which,19 belts are the most *** addition,a series of maps about tin metallogenic belts and tin metallogenic regularity were compiled,aiming to provide theoretical basis for potential estimation and prediction of tin mineral resources.

关键词： tin deposits type of tin deposits mineralization epoch tin metallogenic belt metallogenicregularity

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