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Enrichment of heavy metal elements and their adsorption on iron oxides during carbonate rock weathering process

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Progress in Natural Science:Materials International 2009年第9期19卷 1133-1139页

作者： Shanqin Ni a, Yiwen Jua, Quanlin Hou a,*, Shijie wang b, Qing Liua, Yudong Wua, Lingling Xiao a a College of earth Science, Graduate {2. of Chinese Academy of sciences, beijing 100049, china b State Key Laboratory of Environment Geochemistry, Institute of Geochemistry, Chinese Academy of sciences, Guiyang 550002. china [a]College of earth Science Graduate University of Chinese Academy of Sciences Beijing 100049 China [b]State Key Laboratory of Environment Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

Analysis of trace elements in the Lower Palaeozoic carbonate rock strata of the beijing area shows that the Cr, Zn, Cd and Pb contents increase from primary carbonate rocks to weathered carbonate rocks and from primary carbonate rocks to the soil coexisting with carbonate rock. Distributions of Cr, Zn, Cd and Pb have the same trends as that of Fe2.3. Iron oxides play different roles at different stages of weathering of carbonate rock. The adsorption of Cr, Zn, Cd and Pb on Fe2.3 is greater than on FeO in soil. However, FeO, as a main component of clay mineral, is a better adsorbent of Cr, Zn, Cd and Pb than Fe2.3 in weathered and primary carbonate rocks. According to R-type clustering analysis, the main components of carbonate rock are divided into marine and continental sediments. Correlation analysis shows that heavy metal elements mainly exist in continental substances.

关键词： Carbonate rock Heavy metal elements Adsorbent Enrichment

The Big Bending of Yanshan Orogenic Belt, its Origin and Environmental Effect

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The Big Bending of Yanshan Orogenic Belt, its Origin and Env...

Geochemistry and mineralogy of the Late Permian coals from the Songzao Coalfield, Chongqing, southwestern china

中生代以来中国大陆板块作用过程学术研讨会

作者： wang Yang JI Guangyi Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of sciences, Guangzhou, 510640 School of {2. Science and mineral resources, china university of geosciences, beijing, 100083 Geological Institute of beijing Municipality, beijing, 100011

＜正＞AlongthestrikingofMesozoicstructureanditsdominatedtopography,YanshanorogenicbeltofNorthchinaexhibitsabi***110-150°***-westdirectioninthenorthernHebeiprovince,butturnstonorth-northeastdirectioninWestLiaoningande...

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Science china earth {2. 2007年第5期50卷 678-688页

作者： DAI ShiFeng1,2. ZHOU YiPing3, REN DeYi1, wang XiBo1, 2. LI Dan1, 2.& ZHAO Lei1, 2.1 State Key Laboratory of Coal resources and Safe Mining ({2. university of Mining and Technology), beijing 100083, china 2.Department of resources and earth Science, china university of Mining and Technology, beijing 100083, china 3 Kunming Research Institute of Coal Science, Kunming 650041, china State Key Laboratory of Coal resources and Safe Mining (china {2. of Mining and Technology) Beijing 100083 China Department of resources and earth Science China University of Mining and Technology Beijing 100083 China Kunming Research Institute of Coal Science Kunming 650041 China State Key Laboratory of Coal resources and Safe Mining (china {2. of Mining and Technology) Beijing 100083 China

mineralogy and geochemistry of the four main workable coal seams (No.6, No.7, No.8, and No.11) of Late Permian age from the Songzao Coalfield, Chongqing, Southwest china, were examined using in- ductively coupled plasma-mass spectrometry (ICP-MS), X-ray fluorescence spectrometry (XRF), cold-vapor absorption spectrometry (CV-AAS), ion-selective electrode (ISE), scanning electron mi- croscopy equipped with an energy-dispersive X-ray spectrometer (SEM-EDX), and X-ray diffraction analysis (XRD). The results showed that the main workable No.8 Coal that accounts for about 60% of the total coal reserves in the Songzao Coalfield was not enriched in hazardous trace elements. The No.11 Coal has high concentrations of alkaline elements, Be (9.14 μg/g), Sc (12.9 μg/g), Ti (9508 μg/g), Mn (397 μg/g), Co (2..7 μg/g), Cu (108 μg/g), Zn (12. μg/g), Ga (32.μg/g), Zr (1304 μg/g), Nb (169 μg/g), Hf (32.7 μg/g), Ta (11.4 μg/g), W (2..8 μg/g), Hg (0.2. μg/g), Pb (2..1 μg/g), Th (2..1 μg/g), and rare {2. elements (509.62.μg/g). The concentration of Nb and Ta in the No. 11 Coal is higher than the industrial grade, and their potential utilization should be further studied. Besides pyrite, quartz, calcite, and clay minerals, trace minerals including chalcopyrite, marcasite, siderite, albite, mixed-layer clay minerals of illite and smectite, monazite, apatite, anatase, chlorite, and gypsum were found in the No.11 Coal. It should be noted that alabandite of hydrothermal origin and anatase occurring as cement were identi- fied in coal. In addition, the clayey microbands derived from alkaline volcanic ashes were identified in the coal. The dominant compositions of these clayey microbands were mixed-layer clay minerals of illite and smectite, which were interlayered with organic bands. The modes of occurrence of alkaline volcanic ash bands indicate that the volcanic activities were characterized by the multiple eruptions, short time interval and small scale for each eruption during peat accumu

关键词： coal trace elements mineral alkaline volcanic ash Late Permian period Songzao Coalfield

A brief introduction to recent applications of several sediment-analysis techniques in palaeolimnological studies-dry bulk density and water content, mineral magnetism, carbonate content, and content of total organic carbon,nitrogen content and carbon/nitrogen ratio

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Journal of Geographical sciences 2000年第1期10卷 28-36页

作者： wang Hong-ya (Dept. of Urban and Environmental sciences, Peking {2., beijing 100871, china Geophysical Laboratory, Dot. of earth sciences, {2. of Aarhus, Finlandsgade 8. DK- 82.0, Aarhus N, Denmark) 北京大学北京

Determination of dry bulk density and water content measurement of magnetic susceptibility (x) and saturation isothermal remanent magnetization (SIRM), determination of carbonate content, and determination of total organic carbon (TOC) content nitrogen content (N%) and carbon/nitrogen (C/N) ratio are some of the techniques which have been widely applied to lacustrine-sediment analyses. The techniques,complemented by others, are usually useful for revealing characteristics of lacustrine-sediments and thus for postulating hydrological regimes in the lake and environmental conditions and human activity around it in palaeolimnological studies. A very brief review is presented on recent applications of these techniques in palaeolimnological work with English literatures published mainly since 1985 and focus given on interpretations of results of these analyses related to palaeoenvironmental reconstructions. Low dry bulk density and high water content often imply relatively warm and wet conditions. High X and SIRM are usually resulted from reduced dilutions in the lake and intensified erosions on its catchment. both of which can be in turn attributed to environmental changes. While variations in patterns of X and SIRM may give further insight on mineral magnetism and thus implications on environmental conditions. Increased carbonate content seems likely to associate to warm and dry *** TOC content is virtually used as one of indicators of warm and wet conditions and variations in C/N ratio may hint variations in relative contributions of different sources, aquatic and terrestrial, to the total organic matter in lake sediments and hence to lake-level fluctuations and climate changes.

关键词： dry bulk density and water content, mineral magnetism carbonate content. total organic carbon content,nitrogen content carbon/nitrogen ratio

Sr-Nd isotopic compositions of the Changjiang sediments: Implications for tracing sediment sources

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Science china earth {2. 2007年第10期50卷 1556-1565页

作者： YANG ShouYe1?, JIANG ShaoYong2. LING HongFei2. XIA XiaoPing3, SUN Min3 & wang DeJie4 1 State Key Laboratory of Marine Geology, Tongji university, Shanghai 2.0092.{2. 2.State Key Laboratory for mineral Deposit Research, Nanjing university, Nanjing 2.0093,{2. 3 Departmen of earth sciences, The university of Hong Kong, Hong Kong SAR,{2. 4 Development Research Center,{2. Geological Survey, beijing 100083,{2. 1. State Key Laboratory of Marine Geology Tongji University Shanghai 200092 China 2. State Key Laboratory for mineral Deposit Research Nanjing University Nanjing 210093 China 3. Department of earth sciences The University of Hong Kong Hong Kong SAR China 4. Development Research Center China Geological Survey Beijing 100083 China

The suspended particulate and fine-grained floodplain sediments were collected from the main stream and tributaries of the Changjiang River for Sr-Nd isotopic measurements. The εNd(0) values gradually decrease downstream from -10.8 on average in the upper reaches to -12.3 in the lower reaches, whereas the 87Sr/86Sr ratios increase correspondingly, averaging 0.72.899 and 0.72.82. respectively in the upper and middle-lower reaches. The compositional variations primarily reflect the complex con- trols of provenance rocks, chemical weathering, and sediment characters between different catchments, among which the abnormal Sr-Nd isotopic compositions of the Yalong, Fujiang, Tuojiang and Yuanjiang rivers indicate the sediment provenance contributions from the Emeishan Basalt in the upper reaches and the old metamorphic and siliceous rocks in the middle-lower reaches. The Sr-Nd isotopic ratios of the Changjiang sediments can better reflect the average composition of weathered continental crust compared to other major rivers in the world because of the unique source rock types in the Changjiang drainage basin. The recognition of the Sr-Nd isotopic systematics of the Changjiang sediments will contribute to our understanding of the Changjiang evolution history and continental weathering processes during the Cenozoic, and also to reconstructing the paleoenvironmental changes in East china and the marginal seas.

关键词： Sr-Nd isotopes, sediment, Changjiang River, source rock, provenance

Ore Geology,H-O-C Isotopes and 40Ar-39Ar Dating of the Wutonggou Iron Deposit,Eastern Tianshan,NW china:Implications for the Source,Timing,and Genesis of Hydrothermal mineralization in a Sedimentary Iron Deposit

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Journal of earth Science 2024年第4期35卷 1170-1185页

作者： Chun-Long wang Yi-Tian wang State Key Laboratory of Geological Processes and mineral resources Collaborative Innovation Center for Exploration of Strategic Mineral ResourcesSchool of Earth ResourcesChina University of GeosciencesWuhan430074China MNR Key Laboratory of Metallogeny and mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing100037China

The Wutonggou iron deposit is located in the well-known iron metallogenic belt in the eastern Tianshan,NW china,and has been regarded as a sedimentary iron *** hydrothermal overprinting could play indispensable roles in the formation of high-grade iron ores in sedimentary iron deposits,previous studies mainly focused on sedimentary-related iron mineralization,while the nature and contribution of hydrothermal fluids are poorly ***,an integrated study of ore geology,H-O-C isotopes and^(40)Ar-^(39)Ar dating,is conducted on the Wutonggou deposit,in order to reveal the features,source,and timing of hydrothermal *** studied deposit includes two mining sections namely the Jianshan and ***δ^(18)O values of early magnetite from the Jianshan section range from+3.0‰to+5.8‰that nearly consistent with classic magmatic magnetite,while increase to 6.3‰-8.0‰in the late *** from the two sections shows comparable H-O isotopic compositions and identical fractionation trends,and is plotted in or periphery to the primary magmatic water *** from the two sections are broadly similar in carbon and oxygen isotopic compositions,and siderite from the Wutonggou section is plotted in the same ***,comparable stable isotopic compositions and evolution trends indicate similar magmatic fluids contributed hydrothermal iron mineralization in the two mining ***,water-rock interactions of varying degrees generated distinct mineralization styles in the Jianshan and Wutonggou sections,and caused the isotopic fractionation in late *** extracted from a hydrothermal siderite ore yielded a^(40)Ar-^(39)Ar plateau age of 2.9.5±2.0 Ma,indicates the timing of hydrothermal iron mineralization is corresponding to the emplacement of vicinity *** together,the hydrothermal mineralization in the Wutonggou iron deposit was the product of remobilization and upgrading of early sedimentary iron ores,a

关键词： iron deposits H-O-C isotopes 40Ar-39Ar dating sedimentary iron deposits Wutonggou iron deposit eastern Tianshan

The Nd-Sr isotope study of Mesozoic granitoids in Jiangxi Province

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Science Bulletin 1999年第15期 3-5页

作者： SHEN Weizhou , LING Hongfei , LI Wuxian , wang Dez , HUANG Xuan PAN Jun Department of earth {2. & State Key Laboratory of mineral Deposit Research, Nanjing university, Nanjing 2.0093, china Institute of Geology, Chinese Academy of {2. , beijing 10002., china

Nd-Sr isotopic compositions of 12.Mesozoic granitoids from Jiangxi Province have been reported. They show loe-εND（-13.8—- 8.3）, high-lsr（0.71069—0.73981） and old tDM（2.87—1635 Ma）. Comparison between the Sm-Nd isotopic compositions of the granitoids and those of the basement metamorphic rocks suggests that these granitoids were mainly derived from the metasedimentary rocks. There is an east-west trend Mesozoic granitoid zone with lowtDMfrom S. Jiangxi to S. Fujian. The origin of these granites was preliminarily discussed.

关键词： Nd-Sr isotopic compositions material source low-tDM zone Mesozoic granitoids Jiangxi Province.

Origin and tectonic setting of low-Si alkaline magma

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Science china earth {2. 2024年第5期67卷 1417-1435页

作者： Qiushi ZHOU Rui wang State Key Laboratory of Geological Processes and mineral resources and Institute of Earth SciencesChina University of GeosciencesBeijing 100083China Frontiers Science Center for Deep-time Digital earth China University of Geosciences(Beijing)Beijing 100083China

Despite of the relatively rare occurrence of alkaline igneous rocks on earth, they are the most diverse group of igneous rocks due to variations in their mineral assemblages and geochemical compositions. Alkaline igneous rocks are generally characterized by Si undersaturation, and K-Na(and in some cases C) enrichment. Although there is no unified alkaline igneous rock classification scheme, diagrams such as total alkalis-SiO_(2. or K_(2.O-SiO_(2. can be used to classify alkaline igneous rocks. The origins of silica-saturated alkaline rocks(SiO_(2.>52.wt.%) are relatively complex because multiple episodes of magmatism are often involved, therefore most studies have focused on the origins of silica-undersaturated alkaline *** experimental petrological studies have been conducted in the past few decades. Initially, it was considered that enrichment of trace elements was only achieved by low-degree partial melting of mantle peridotite, but the experimental melts could not reproduce the geochemical composition of natural alkaline igneous rocks. Subsequent studies have focused on carbonate-bearing eclogites that represent the average component of subducted oceanic crust. Although experimental studies indicate that silica-undersaturated and alkali-oversaturated melts can be generated from eclogites, some studies have considered that natural silica-undersaturated alkaline igneous rocks are the result of multi-stage source enrichment by incompatible elements. Low-degree partial melts of the mantle can be emplaced in the lithospheric mantle, forming veins consisting of phlogopite, amphibole, and pyroxene. Melting experiments including these components show that the produced melts better reproduce the naturally occurring silica-undersaturated alkaline magmas. Silica-deficient alkaline igneous rocks occur in various tectonic settings. Those in intraplate and divergent settings(i.e., mainly continental rifts) normally involve contributions from recycled components su

关键词： Alkaline igneous rock Tectonic setting Petrogenesis Big data

Isotopic disequilibrium in ultrahigh-pressure and retrograde metamorphism of eclogite and gneiss from the Chinese Continental Scientific Drilling in the Sulu orogen,china:evidence from mineral Nd-Sr-O isotopic composition

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Isotopic disequilibrium in ultrahigh-pressure and retrograde...