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Genesis and geological significance of carbonate in Changdu Basin,Xizang,China:Constraints from geochemistry and C-O isotopes

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Acta Geochimica 2024年第6期43卷 1192-1204页

作者： Wenhua Han Yongshou Li haizhou ma Huaide Cheng Binkai Li Qinyu Hai Xuahai ma Key Laboratory of Comprehensive and Highly Effi cient Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Xining 810008China

Research on the origin of carbonates in Changdu Basin holds significant importance for understanding the regional potash formation *** on a comprehensive review of previous studies,field geological surveys,and laboratory investigations,this study analyzes the origin and properties of carbonates within the context of regional potash *** studies show that magnesite deposits,with the characteristics of sedimentary *** results of elemental geochemical analysis show that the carbonates in this area were formed in the sedimentary environment via evaporation followed by concentration,and the formation of magnesite was possibly caused by the substitution of calcium in the dolomite with magnesium-rich ***δ^(13)C values of carbonats in the study area are between5.9‰and 9.1‰.Theδ^(18)O values of magnesite samples range from-7.3‰to-1.3‰,and theδ^(18)O values of dolomites range from-10.3‰to-8.4‰.All the calculated Z values of oxygen isotopes of carbonates greater than 120.A comprehensive analysis of carbon and oxygen isotopes indicates that the magnesite was formed in a highly concentrated marine sedimentary environment and does not show any relation with the metasomatism of hydrothermal *** results on the correlation of magnesite with seawater and its sedimentary origin provide key information for explaining the migration direction of brine between the Changdu and Lanping-Simao *** residual metamorphic seawater in the Changdu Basin migrated to the Lanping-Simao Basin,where potash underwent ***,magnesite and dolomite in the early stage of potash formation were left in the Changdu Basin.

关键词： Changdu basin Carbonatite Geochemistry Mineral deposit genesis Significance of potash formation

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Origin of Boron in the Gas Hure Salt Lake of Northwestern Qaidam Basin, China: Evidence from Hydrochemistry and Boron Isotopes

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 531-540页

作者： HAN Jibin XU Jianxin Syed Asim HUSSAIN JIANG Hongchen ma Yunqi XU Kai ma haizhou Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Xining 810008China Department of Earth Sciences Karakoram International UniversityGilgitGilgit-Baltistan 15100Pakistan State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China

The Gas Hure Salt Lake(GHSL) in the northwestern Qaidam Basin, western China, is rich in boron(B) resources, but its B-resource origin is hardly known. Hydrochemical compositions and B isotope characteristics of different waters were collected around the GHSL, including the river water, stream water, spring water, salt-lake brine, intercrystalline brine, well water, drilling brine, and solar pond brine. The hydrochemical signatures suggest that silicates, carbonates and evaporates are the main B-bearing rocks during the water dynamic. The reservoir estimation of B resources shows that the Kulamulekesay River(KLMR) and the Atekan River(ATKR) contribute annually 18.3 tons and 22.84 tons of B, respectively, with a total amount of 11.72 × 10^(4) tons of B during the past 5.7 ka. In comparison with the known B reservoir(32.96 × 10^(4) tons) in the GHSL, a significant amount of B in the GHSL was probably recharged from deep fluids and sediments around the GHSL. The B concentration and B-enrichment degree are shaped by the evaporation process, which are highly elevated at the carnallite and bischofite stages.

关键词： B-bearing rock weathering evaporation process Holocene Qinghai and Xinjiang provinces

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Origin and evolution of oilfield brines from Tertiary strata in western Qaidam Basin:Constraints from ^(87)Sr/^(86)Sr,δD,δ^(18)O,δ^(34)S and water chemistry

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Chinese Journal Of Geochemistry 2010年第4期29卷 446-454页

作者： FAN Qishun ma haizhou LAI Zhongping TAN Hongbing LI Tingwei Key Laboratory of Salt Lake Resources and Chemistry Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining 810008 China Graduate School of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China

Chemistry of major and minor elements,87Sr/86Sr,δD,δ18O and δ34S of brines were measured from Tertiary strata and Quaternary salt lakes in the western Qaidam *** water chemistry data show that all oilfield brines are CaCl2 *** were enriched in Ca2+,B3+,Li+,Sr2+,Br-,and were depleted in Mg2+,SO42-,which indicated that these brines had the characteristics of deeply circulated *** relationship between δD and δ18O shows that all data of these brines decline towards the Global Meteoric Water Line(GWL) and Qaidam Meteoric Water Line(QWL),and that the intersection between oilfield brines and Meteoric Water Lines was close to the local spring and fresh water in the piedmont in the western Qaidam *** results suggest that oilfield brines has initially originated from meteoric water,and then might be affected by water-rock metamorphose,because most oilfield brines distribute in the range of metamorphosing *** 87Sr/86Sr values of most oilfield brines range from 0.71121 to 0.71194,and was less than that in salt lake water(>0.712),but close to that of halite in the study *** imply that salt dissolution occurred in the process of *** addition,all oilfield brines have obviously much positive δ34S values(ranging from 26.46‰ to 54.57‰) than that of salt lake brines,which was caused by bacterial sulfate reduction resulting in positive shift of δ34S value and depleteed SO42-in oilfield *** with water chemical data and δD,δ18O,87Sr/86Sr,δ34S values,we concluded that oilfield brines mainly originate from the deeply circulated meteoric waters,and then are affected by salt dissolution,water-rock metamorphose,sulfate reduction and dolomitization during the process of *** processes alter the chemical compositions of oilfield brines and accumulate rich elements(such as B,Li,Sr,Br,K and so on) for sustainable utilization of salt lake resources in the Qaidam Basin.

关键词：柴达木盆地西部油田卤水第三纪水化学地层硫酸盐还原锶演化

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Strontium and boron isotopic constraint on the marine origin of the Khammuane potash deposits in southeastern Laos

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Chinese Science Bulletin 2010年第27期55卷 3181-3188页

作者： TAN HongBing ma haizhou LI BinKai ZHANG XiYing XIAO YingKai School of Earth Science and Engineering Hohai University Nanjing 210098 China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanfing 210098 China Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining 810008 China

Since 2006,we have conducted a geological exploration of the Khammuane area in southeastern *** thick sequences of potash deposits containing sylvite and carnallite were discovered from drilling Paleocene strata of the Thangon Formation(E1tg).To constrain the origin of the brine that formed thick sequences of salt mineral deposits,we measured the strontium and boron isotope composition of some salt minerals in the potash *** isotope composition of halite-and potash-associated minerals in the Khammuane potash deposit varied from 19.91%to 31.01‰,which differs significantly from continental evaporates(-6.83‰--5.79‰)but is very close to that of salts precipitated from evapo-concentrated seawater(10‰-36‰).The 87Sr/86Sr ratios(0.707542 to 0.709461)of salts were also close to the values of Paleocene seawater(0.70772 to 0.707830).The content of Br-(0.01%-0.25%)and Br×103/Cl ratios(0.10-0.52)of halite were>10 times higher than that of common continental *** characteristics indicate clearly that the Laos potash deposits were deposited from *** small variation in boron and strontium isotopes in all salt sedimentary sequences(gypsum-halite-potash-halite)also suggests that the recharge source should be stable and the effects of other continental water mixing are ***-scale potash deposits are commonly precipitated from ***,the results of recent regional drilling work and geochemical research suggest extensive potash resources could occur in the Thangon Formation of southeastern Laos.

关键词：同位素组成东南部地区钾盐矿床锶同位素老挝硼沉积序列成因

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Typical Geochemical Elements in Loess Deposit in the Northeastern Tibetan Plateau and Its Paleoclimatic Implication

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Acta Geologica Sinica(English Edition) 2006年第1期80卷 110-116页

作者： TAN Hongbing ma haizhou ZHANG Xiying LU Huayu WANG Jianguo Institute of Salt Lakes Chinese Academy of Sciences Xining Qinghai 810008 Institute of Earth Environment Chinese Academy of Sciences Xi＇an Shaanxi 710075

Widespread and thick loess deposit in the northeastern Tibetan Plateau records paleoclimatic changes over the Quaternary period. In this study, we investigate a loess section located in a high terrace of the Huangshui River in the Xining Basin, and collect samples at 20-cm intervals by digging a well of 16-m depth （including paleosol S1 and SO and several loess interlayers over the last glacial-interglacial cycle and the Holocene）. Concentration of some active elements （Sr and Ca） and inert elements （Rb, Zr, Ti） in these loess samples are measured. The results show that ratios of those elements （oxide）, such as Rb/Sr, Ti/Sr, and Zr/CaO ratios, would indicate sensitively paleoclimatic changes, especially the history of precipitation over the last glacial-interglacial and the Holocene. Moreover, the curves of Rb/Sr, Ti/Sr, and Zr/CaO ratios had almost the same variable trends from the bottom to the top and also closely correlated with values of magnetic susceptibility and the global marine δ^18O record. But compared with the curves of magnetic susceptibility, the changes of ratios of these elements （oxide） are clearer and easy to understand. Therefore, the ratios of these typical chemical elements in the loess deposit may be used as an excellent index to investigate the history of paleoclimate, particularly precipitation changes in the northeastern Tibetan Plateau.

关键词： northeastern Tibetan Plateau loess aleosol geochemical elements paleoclimate

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Sample preparation for isotopic determination of boron in clay sediments

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Chinese Journal Of Geochemistry 2013年第2期32卷 203-211页

作者： ZHANG Yanling XIAO Yingkai ma Yunqi ZHUGE Qin LIU Zhiqi HE maoyong LUO Chongguang ma haizhou Key Laboratory of Salt Lake Resources and Chemistry Qinghai Institute of Salt Lakes Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences

The procedures of sample preparation for isotopic determination of boron in clay sediments is very cumbersome, by far, there haven't been relevant reports on that. In order to establish an effective method for sample preparation, a series of experiments were carried out. In this paper, boron in clay sediments was extracted with HCl solution and purified by two-step ion exchange method. Extracted HCl solution should be adjusted to alkalescency before passing through the Amberlite IRA 743 resin column due to the fact that Amberlite IRA 743 resin absorbs boron only from alkalescent solution. However, a mass of hydroxides of Al and Fe will be precipitated when the extracted HCl solution becomes alkalescent. Hydroxides of Al and Fe have a strong adsorption capacity for boron, which can cause boron isotope fractionation. To treat precipitated hydroxides of Al and Fe, four procedures, namely direct ion exchange (DRIE), decationizing ion exchange (DCIE), once sedimentation ion exchange (OSIE) and repeated sedimentation ion exchange (RSIE) were used and assessed. The influences of the four procedures on separation and extraction and isotopic composition of boron in experimental solutions and clay sediments were also discussed. According to the results, the DRIE, DCIE and OSIE are improper. The result of sample determination indicates that when extracting boron via RSIE, with the increase of precipitation times, there's an obvious decrease in boron content in the precipitated hydroxides while a sharp increase in recovery of boron and it is favorable for weakening the influence of boron isotope fractionation. But the process of RSIE is time consuming and it may introduce boron. It needs further research to establish a more effective sample preparation method for isotopic deter- mination of boron in clay sediments.

关键词：硼同位素组成同位素测定样品制备沉积物粘土离子交换法沉淀时间 HCl溶液

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Seasonal Interaction of River Water-Groundwater-Salt Lake Brine and Its Influence on Water-Salt Balance in the Nalenggele River Catchment in Qaidam Basin,NW China

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Journal of Earth Science 2022年第5期33卷 1298-1308页

作者： Jibin Han Jianxin Xu Lei Yi Zheng Chang Jianping Wang haizhou ma Baoyun Zhang Hongchen Jiang Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Qinghai Institute of Salt LakesChinese Academy of SciencesXining810008China University of Chinese Academy of Sciences Beijing100049China Haixi Water Resources Bureau of Qinghai Province Delingha817200China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan430074China

Identifying interactions among river water,groundwater and salt lake brine is important for sustainable exploitation of brine mineral *** this study,we investigated the water exchange rate in dry and wet seasons,and assessed the influence of seasonal water exchange on brine concentration and crystallization process in the Nalenggele(NLGL)catchment of Qaidam Basin,*** results show that the surface water infiltration and groundwater recharge rates in the wet season were 2.81×10^(-3)and 1.15×10^(-3)m^(3)/(s·m)in upstream,1.63×10^(-2)and 1.53×10^(-2)m^(3)/(s·m)in midstream,and 2.83×10^(-4)and 6.82×10^(-5)m^(3)/(s·m)in downstream,respectively;while their counterparts in the dry season were 9.81×10^(-4)and 5.05×10^(-4)m^(3)/(s·m)in upstream,and 8.34×10^(-3)and 7.78×10^(-3)m^(3)/(s·m)in midstream,*** water exchange strongly influenced brine concentration and crystallinzation process,with brine chemistry belonging to 3K_(2)SO_(4)·Na_(2)SO_(4) and KCl types in wet and dry seasons,*** strong water exchange in wet season destroyed the water-salt balance,while the low water exchange rate in dry season facilitated preparation of KCl products.

关键词： river water-groundwater-salt lake interactions 222Rn isotope δ18O-δD isotope seasonal variation Nalenggele River catchment hydrogeology

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Geochemical Constraints on the Origin and Evolution of Spring Waters in the Changdu-Lanping-Simao Basin, Southwestern China

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 1097-1112页

作者： QIN Xiwei ma haizhou ZHANG Xiying CHENG Huaide HAN Jibin LI Yongshou MIAO Weiliang HAI Qingyu Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt lakesNorthwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences810008 XiningChina Key Laboratory of Salt Lake Geology and Environment of Qinghai Province Qinghai Institute of Salt LakesNorthwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences810008 XiningChina University of Chinese Academy of Sciences 100049 BeijingChina School of Environmental Studies China University of Geosciences430074 WuhanChina

Chemical and isotopic data were measured for 51 leached brine springs in the Changdu-Lanping-Simao Basin(CD-LP-SM),*** predominance of Cl and Na,saturation indices of carbonate minerals,and Na/Cl and Ca/SO4 ratios of^1 suggest that halite,sulphate,and carbonate are the solute *** of geochemical,δ18 O,andδD values suggests that springs are mainly derived from meteoric water,ice-snow melt,and water-rock interactions.B concentrations range from 0.18 to 11.9 mg/L,withδ11 B values of-4.37‰to+32.39‰,indicating a terrestrial ***δ11 B-B relationships suggest B sources of crustal origin(marine carbonates with minor crust-derived volcanics);we did not identify a marine or deep mantle ***δ11 B values of saline springs(+4.61‰to+32.39‰)exceed those of hot(-4.37‰to+4.53‰)and cold(-3.47‰to+14.84‰)springs;this has contributed to strong water-rock interactions and strong saturation of dissolved ***,the global geothermalδ11 B-Cl/B relationship suggests mixing of marine and non-marine ***δ11 B-Cl/B relationships of the CD-LP-SM are similar to those of the Tibet geothermal belt and the Nangqen Basin,indicating the same B *** differ from thermal waters controlled by magmatic fluids and seawater,suggesting that B in CD-LP-SM springs has a crustal origin.

关键词： Changdu-Lanping-Simao Basin δ18O δD δ11B Boron spring water origin

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Palaeoclimatic evolution recorded by multidicipline in sediments in gahai lake, qaidam basin since late last deglacial

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High Technology Letters 2010年第3期16卷 324-330页

作者： Chen Zhong ma haizhou Cao Guangchao Zhang Xiying Zhou Dujun Yao Yuan Yang Guangshu Faculty of Land Resource Engineering Kunming University of Science and Technology Kunming 650093 P.R. China Qinghai Institute of Salt Lake Chinese Academy of Sciences Xining 810008 P.R. China School of Life and Geography Science Qinghai Normal University Xining 810008 P.R. China East China Geological Exploration Institute of Non-ferrous Metals Nanjing 210007 P.R. China

Based on the analyses of Loss-on-Ignition （LOI）, carbonate content and sediment characteristics, this paper reconstructs the climatic and environmental evolution of the Gahai lake area since the late Last Deglacial Period. The results cover the late Last Deglacial Period and the Holocene. The climate was very unstable and rather arid during the late Last Deglacial Period. The Holocene can be divided into three periods： the early Holocene （11360-8240 cal aB. P. ）, which was dry but unstable and featured rising temperatures, the mid-Holocene （8240-3200 cal aB. P. ）, which was warm and wet and the late Holocene （ since 3200 cal aBP）, which was cold and dry. Results also show a warm-wet event around 1500 cal aB. P.

关键词： Gahai Lake late Last Deglaciation Holocene Palaeoclimate

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Boron Isotopic Composition of Halite from 46-m-long Sediment Core in the Qarhan Salt Lake,Western China

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 131-132页

作者： FAN Qishun ma Yunqi CHENG Huaide ma haizhou HAN Fenqing Key Laboratory of Salt Lake Resources and Chemistry Qinghai Institute of Salt LakesChinese Academy of Sciences

Previous studies have investigated the boron isotopic composition of salt lake brines in the Qaidam Basin,western ***,the research on boron isotopic composition of halite is very limited due to halite’s low

关键词： Lake Boron Isotopic Composition of Halite from 46-m-long Sediment Core in the Qarhan Salt Lake,Western China

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