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Acta Geochimica 2022年第5期41卷 731-740页

作者： Bin-Kai Li Mao-Yong He Hai-Zhou Ma Huai-De Cheng Lian-Min Ji Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Qinghai Institute of Salt LakesChinese Academy of Sciences810008 XiningQinghaiChina State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of Sciences710061 Xi’anChina University of the Chinese Academy of Sciences 100049 BeijingChina

boron is an essential,widely used,micronutrient element and is abundant in salt lakes on the Qinghai-Tibet *** origin and distribution of boron brine deposits on the Qinghai-Tibet Plateau is an important foundation for B resource formation,evolution,and enrichment,which have long been the subject of *** boron isotope system is a sensitive geochemical tracer,making it useful for eff ectively and precisely tracking a wide range of geological processes and *** study investigates the major cations,[B],andδB values of samples(lake brine,river waters,and cold spring water)from the Bangor Co Lake which is a typical salt lake rich in boron in Tibet,*** are magnitude-scale diff erences in[B]among diff erent sample types:river samplesboron in Bangor Co Lake are mainly the recharge water with higherδB values and spring water with lowerδB values,and the boron sources and the uneven mixing of lake water are two reasons that account for the large change in theδB value of Bangor Co Lake.

关键词： Tibet Bangor Co salt lake boron isotope Origin Fractionation processes

The source of lithium in Lakkor Co Salt Lake on Qinghai-Tibet Plateau,China:evidence from hydrochemical characteristics and boron isotope

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Acta Geochimica 2024年第5期43卷 933-946页

作者： Zheng Yan Li Bin Kai Li Mao-Yong He Xue Qin Wen Jiang Di Zhou Department of Geoscience and Technology Taiyuan University of TechnologyYingzexi StreetTaiyuan 030024Shanxi ProvinceChina State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008QinghaiChina School of Earth Science and Resources Chang’an UniversityXi’an 710000ShaanxiChina Qinghai Normal University Academy of Plateau Science and SustainabilityXining 810016China

The availability of lithium resources is of great significance for the development of modern technologies,as well as for civil and military *** Qinghai-Tibet Plateau is a region known for its abundance of lithium-rich salt ***,the specific origin of lithium in these lakes is still unknown,which hinders the advancement of the lithium resource business in this *** research this issue,this study involved the collection of 20 samples from Lakkor Co Salt Lake on Qinghai-Tibet Plateau,encompassing samples of surface brine,cold springs,fresh lakes,and recharge *** composition of anions and cations in these samples was ***,the analysis extensivelyutilizedthePiperthree-linediagram,Gibbs model,and ion proportion *** findings of this study indicate that as the moves from the recharge water system to salt lake,there is a transition in water type from strong carbonate to moderate carbonate and weak carbonate,as well as Na *** research based on a similar source of both lithium and boron,utilized ion correlation analysis and boron isotope study in the Lakkor Co area,and analyzed the source and transporting process of *** main origin of lithium in Lakkor Co is the dissolution of lithiumrich rocks,recharge water systems,and deep hydrothermal *** findings are highly significant in enhancing the foundational data of lithium-rich brine resources in the Qinghai-Tibet Plateau and are beneficial for assessing the future development of such deposits.

关键词： Lithium Hydrochemical Li-rich Salt lake boron isotope

Water geochemistry and boron isotope in the Xijiang River,SW China

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Acta Geochimica 2006年第S1期 271-271页

作者： Zhiqi ZHAO1, Congqiang LIU1, Zhifang XU2 1 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100081, China

Geochemical processes and origin of boron isotopes in geothermal water in the Yunnan-Tibet geothermal zone

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Science China Earth Sciences 2014年第9期57卷 2934-2944页

作者： Lü YuanYuan ZHENG MianPing ZHAO Ping XU RongHua MLR Key Laboratory of Saline Lake Resources and Environments Institute of Mineral Resources Chinese Academy of Geological Sciences Institute of Tibetan Plateau Research Chinese Academy of Sciences Institute of Geology and Geophysics Chinese Academy of Sciences

boron concentrations and isotope compositions have been measured for 93 water samples from the hot springs and drill-holes in the geothermal system in the Yunnan-Tibet Geothermal Belt(YTGB),*** concentrations range from 0.036–472.4ppm,and theδ11B values range from -16.0‰to 13.1‰,indicating the non-marine origin for each geothermal *** observed a clear binary mixing relationship between the B concentrations and B isotope compositions in Tibet geothermal *** relationship can be well explained by two sources,i.e.,marine carbonate rocks and magmatic rocks,for the Tibet geothermal *** evidence supports a mantle contribution to *** addition,we found that the precipitation only plays a dilution role for B of geothermal waters.δ11B values for the precipitation across the southern Tibetan Plateau area range from -6.0‰ to -6.8‰at *** to data scarcity in Yunnan geothermal area,we observed possible different boron sources from the Tibet geothermal *** it with other geothermal systems in the world,we found that the samples from YTGB have the lowestδ11B values and the largest range of B concentration,which might be related to their special geological *** the whole,the world geothermalδ11B-Cl/B relation suggests a mixing process between marine and non-marine ***,we suggest that B source of B-enriched geothermal waters is mainly from B-enriched crustal country-rocks,instead of mantle.

关键词： Yunnan-Tibet geothermal zone boron isotope geothermal water tracing

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Geochemical and boron Isotopic Evidence that Tourmaline Records Country Rock Assimilation of Leucogranites in the Himalayan Orogen

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 123-134页

作者： HU Guyue GAO Li’e ZENG Lingsen LI Yike MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China MNR Key Laboratory of Deep-Earth Dynamics Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China

Tourmaline geochemical and boron(B)isotopic compositions in two-mica granites(TMG),tourmaline-bearing leucogranites(Tou-LG),tourmalites and metapelites from the Gyirong-Malashan areas of the Himalayan orogen provide evidence for country rock assimilation during the intrusion of Himalayan *** schorls in Gyirong leucogranitic plutons show low contents of MgO(0.238%-1.160%)and δ^(11)B values(-12.1‰--11.2‰),while dravites gathered in the contact zone between the leucogranitic veins and metapelites show high contents of MgO(4.815%-6.755%)and δ^(11)B values(-10.7‰--9.3‰).This geochemical and isotopic variation of tourmalines can also be identified in the Malashan gneiss *** a result,three types of tourmaline were identified in the Himalayan orogen:(1)Tou-Ⅰ in the TMG and Tou-LG,which is the most common tourmaline type of schorl;(2)Tou-Ⅱ(dravite and high-Mg schorl)in the Tou-LG and tourmalite at the margins of the leucogranite;and(3)Tou-Ⅲ(mainly dravite,with minor high-Mg schorl)in metapelites of the High Himalayan Crystalline *** lenses and veins of Tou-LG may have experienced metasomatism and assimilation as a result of interaction with the High Himalayan Crystalline Sequence metasedimentary country rocks,which can be traced by the geochemical and isotopic characteristics of the tourmaline therein.

关键词： boron isotope tourmaline granite country rock assimilation Himalayan orogen

Carbon, oxygen and boron isotopic studies of Huangbai-shuwan witherite deposit at Ziyang and Wenyuhe witherite deposit at Zhushan

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Science China Earth Sciences 2003年第12期46卷 1273-1291页

作者：吕志成刘丛强刘家军赵志琦 Jilin University Changchun 130026 China The State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sci-ences Guiyang 550002 China Open Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China The State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sci-ences Guiyang 550002 China Open Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

Being stratiform or stratoid, the Huangbaishuwan witherite deposit at Ziyang and the Wenyuhe witherite-barite deposit at Zhushan occur in the lower Lower Cambrian siliceous rocks and the orebodies are remarkably controlled by lithological character and petrography. boron, carbon and oxygen isotopic studies of witherite, barytocalcite and calcite have shown that the car-bon, involved in the formation of these minerals, was derived mainly from hydrocarbons and bio-genetic gases resulting from degradation, polycondensation and dehydroxylation of bio-organic matter in sediments at the early stage of diagenesis; the boron was a mixture of boron in pore wa-ter and that released in the process of degradation of organic matter, with a minor amount of boron from cycling brines in the deep interior of the basin. boron, carbon and oxygen isotopic studies unanimously demonstrated that witherite was precipitated in this sort of organic carbon-rich pore water medium during the early stage of diagenesis. Extensive occurrence of biodetritus and clastic texture in witherite ores strongly evidenced that Ba2+ was concentrated and settled down in the form of bio-barite on the seafloor as a result of biological processes, thereafter forming the initially enriched orebodies of barium deposits. Biological processes in seawater and early diagenesis in sediments are the major ore-forming mechanisms of witherite deposits in the region studied.

关键词： witherite deposit boron isotope carbon and oxygen isotopes early diagenesis bio-barite.

boron isotopic composition of Paleozoic brachiopod and coeval coral calcites in Yunnan-Guizhou Plateau, China

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Science China Earth Sciences 2011年第12期54卷 1912-1925页

作者： MA YunQi XIAO YingKai HE MaoYong XIAO Jun SHEN Quan JIANG ShengXiang Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China Key Laboratory of Salt Lake Resources and Chemistry Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining 810008 China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi ＇an 710075 China Geological Team 1 Yunnan Geoexploration and Development Bureau of Mineral Resources Qujing 655000 China Graduate University of Chinese Academy of Sciences. Beijing 100049. China

boron isotope values in Paleozoic brachiopods and corals, collected from the Yunnan-Guizhou Plateau, China, can be used to constrain the boron isotope compositions of past oceans. All brachiopod shells and coral samples were screened for diagenetic recrystallization by cathodoluminescence microscopy, trace element geochemistry of B, Fe, Mn, Sr, and scanning electron microscopy. The boron isotope ratios for brachiopods in Silurian, Devonian, Carboniferous, and Triassic calcites are in the ranges 8.9‰-14.0‰, 8.8‰-13.8‰, 10.3‰-16.3‰, and 6.7‰-12.4‰, respectively. The boron isotope ratios of coral calcites in the Silurian, Devonian, and Permian are 9.1‰-12.2‰, 6.1‰-13.8‰, and 9.2‰-16.1‰, respectively. The δ11B values for both brachiopods and corals are significantly lower than those for modern biogenic carbonates, indicating that the Paleozoic oceans were depleted of δ11B by up to 10‰. Our results are consistent with previous published studies. The boron isotope compositions of corals and brachiopods show the consistent trends. The low δ11B values may be explained by an enhanced riverine flux of boron from the continents.

关键词： boron isotope coral brachiopod Paleozoic

A preliminary experimental study of the boron concentration in vapor and the isotopic fractionation of boron between seawater and vapor during evaporation of seawater

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Science China Chemistry 2001年第5期44卷 540-551页

作者：肖应凯 G.H.Swihart 肖云 R.D.VockeJr. Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining China Department of Geological Sciences The University of Memphis Memphis USA Inorganic Analytical Chemistry Division National Institute of Standards and Technology Gaithersburg USA

A laboratory experiment was undertaken to investigate the behaviour of boron at the seawater-air interface under air flow conditions. Dried air at 25 and 35℃ was passed over or bubbled through seawater at the same temperature. A combination of ice-chilled condensers and KOH impregnated cellulose fibre filters was used to collect boron from the reacted air. When air stripped of boron was passed over the seawater, boron was found in the reacted air, and its concentration was higher in the higher temperature test. In the tests where air was bubbled through seawater the concentration of boron in the reacted air was directly proportional to the air flow rate. In this situation the boron in the reacted air was mainly introduced as a spray of microdroplets. Isotopic analysis of the collected boron in the non-bubbled tests yields fractionation factors which demonstrate that the lighter isotope, 10B, is enriched in the reacted air. The size of the fractionation changes with temperature, ruling out a purely kinetic effect.

关键词： boron isotope isotopic fractionation evaporation seawater.

Petrogenesis of granitic pegmatite veins:Perspectives from major element and B isotope in tourmalines,Chakabeishan,Northern Tibetan Plateau

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Geoscience Frontiers 2023年第5期14卷 267-279页

作者： Wenli Sun Zhidan Zhao Yaoling Niu Chunjing Wei Guochen Dong Xiaowei Li Wanming Yuan Tao Wang Bingzhang Wang Tong Pan Jie Han Hongliang Cao Yan Tang Dicheng Zhu State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science and ResourcesChina University of GeosciencesBeijing 100083China MOE Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing 100871China Gansu Industry Polytechnic College Tianshui 741025China Laoshan Laboratory Qingdao 266237China Bureau of Geological Exploration and Development of Qinghai Province Xining 810012China

The petrogenesis of regionally zoned granitic pegmatite veins remains *** of the economic significance,we carried out a study on the Chakabeishan(CKBS)pegmatite-type Li-Be deposit,eastern North Qaidam Tectonic Belt,Northern Tibetan Plateau,by means of in-situ major element and B isotope compositions of tourmalines in the beryl-bearing and spodumene-bearing pegmatite ***(Tur-Be)from the beryl-bearing pegmatite are homogeneous schorl with low Mg/(Mg+Fe),high Na/(Na+Ca)and Y Al,suggesting that they are of magmatic *** generations of tourmalines(TurLi)from the spodumene-bearing pegmatite are identified:(i)the crystal cores(mostly elbaite and Lirich schorl with subordinate schorl)are consistent with being of magmatic origin crystallized at the magmatic stage;(ii)the crystal rims(schorl)are best understood as the overgrowth at the later hydrothermal ***-Be and Tur-Li show an obvious difference in core-to-rim B isotopic variation trend with d11B decrease in Tur-Be and increase in *** core-to-rim d11B decrease in Tur-Be results from degassing during its host pegmatitic melt evolution,whereas the core-to-rim d11B increase in Tur-Li is related to fluid *** estimated d11B values for the initial melts of the beryl-bearing and spodumenebearing pegmatites are10.46‰and10.78‰,respectively,indicating that they most likely originate from protracted fractional crystallization/differentiation of granitic intrusions rather than partial melting of *** Mg/(Mg+Fe)ratios and Li abundances in the cores of Tur-Be are lower than those of Tur-Li,suggesting that Tur-Li crystallizes from chemically more evolved melts.

关键词： Petrogenesis Pegmatite Tourmaline boron isotope Major element

boron Isotopic Fractionation and Trace Element Incorporation in Various Species of Modern Corals in Sanya Bay, South China Sea

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Journal of Earth Science 2014年第3期25卷 431-444页

作者： Haizhen Wei Shaoyong Jiang Yingkai Xiao N Gary Hemming State Key Laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University State Key Laboratory of Geological Processes and Mineral Resources Faculty of Earth ResourcesChina University of Geosciences Wuhan Qinghai Institute of Salt Lakes Chinese Academy of Sciences Lamont-Doherty Earth Observatory of Columbia University Queens College School of Earth and Environmental Sciences

The boron isotope paleo-pH proxy has been extensively studied due to its potential for understanding past climate change, and further calibrations were considered for accurate applications of the proxy because of significant variability related to biocarbonate microstructure. In this work, we studied the boron isotopic fractionation between modern marine corals and their coexisting seawater collected along shallow area in Sanya Bay, South China Sea. The apparent partition coefficient of boron（KD） ranged from 0.83×10-3 to 1.69×10-3, which are in good agreement with previous studies. As the analyzed coral skeleton（~5 g） spanned the growth time period of 1–2 years, we discussed the boron isotopic fractionation between pristine corals and modern seawater using the annual mean seawater pH of 8.12 in this sea area. Without taking the vital effect into account,（11B/10B）coral values of all living corals spread over the curves of（11B/10B）borate vs.（11B/10B）sw with the α4-3 values ranging from 0.974 to 0.982. After calibrating the biological effect on the calcifying fluid pH, the field-based calcification on calcifying fluid pH（i.e., Δ（pHbiol-pHsw）） for coral species of Acropora, Pavona, Pocillopora, Faviidae, and others including Proites are 0.42, 0.33, 0.36, 0.19, respectively, and it is necessary to be validated by coral culturing experiment in the future. Correlations in B/Ca vs. Sr/Ca and B/Ca vs. pHbiol approve temperature and calcifying fluid pH influence on skeletal B/Ca. Fundamental understanding of the thermodynamic basis of the boron isotopes in marine carbonates and seawater will strengthen the confidence in the use of paleo-pH proxy as a powerful tool to monitor atmospheric CO2 variations in the past.

关键词： boron isotope paleo-pH proxy boron isotopic fractionation trace element modern coral.