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Genesis of sandstone-type uranium deposits along the northern margin of the Ordos Basin,China

Geoscience Frontiers 2020年第1期11卷 215-227页

作者： Ruoshi Jin xueming teng Xiaoguang Li Qinghong Si Wei Wang Tianjin Center China Geological SurveyTianjin 300170China Key Laboratory of Uranium Geology China Geological SurveyTianjin 300170China

Sandstone-type U mineral resources are among the important sources for nuclear *** U deposits in the Ordos Basin in China form part of the northern segment of the sandstone-hosted Central Asian Uranium *** types of mineralizations are recognized in this basin:"phreatic permeable type"and"interlayer permeable type",both exhibiting features equivalent to roll-front ***"interlayer permeable type"is widely accepted as the dominant mineralization type for sandstone-type uranium deposits within large-scale basins,also designated as the"interlayer oxidation zone type",based on the horizontal color zoning model representing changing redox *** we synthesize data from several drill holes within the Ordos Basin,which suggest that major Mesozoic tectonic movements controlled the evolution of the sedimentary system in the *** tectonic movements contributed to the formation of three angular unconformities and four parallel unconformities as inferred from the stratigraphic *** addition,other features such as vertical color zoning,paleo-channel controlled tabular or lentoid ore bodies(without roll-type)and a group interlayer horizontal zoning of altered minerals are also *** stratigraphic analysis indicates that the Ordos Basin generally witnessed four cycles of water level variations during *** the variations,three high water level and three low water level events were *** characteristics imply that the Ordos Basin went through multiple arid to humid climatic evolutions during *** the newly documented features with some novel concepts on the hydrodynamic mechanism for supergene ore-forming fluids,we propose a metallogenic model which invokes the importance of tectonic movements and water level fluctuations to explain the genesis of uranium deposits along the northern margin of the Ordos Basin.

关键词： Sequence stratigraphic analysis Hydrodynamic mechanisms Metallogenic model Tectonic history Ordos Basin

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Origin and circulation of saline springs in the Kuqa Basin of the Tarim Basin,Northwest China

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Journal of Arid Land 2020年第2期12卷 331-348页

作者： SHAN Junjie WANG Jianping SHAN Fashou teng xueming FAN Qishun LIQingkuan QIN Zhanjie ZHANG Xiangru Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Key Laboratory of Salt Lake Geology and Environment of Qinghai Province Xining 810008China University of Chinese Academy of Sciences Beijing 100085China Tianjin Center China Geological SurveyTianjin 300170China

It is widely accepted that hydrogeochemistry of saline springs is extremely important to understand the water circulation and evolution of saline basins and to evaluate the potential of potassium-rich *** Kuqa Basin,located in the northern part of the Tarim Basin in Northwest China,is a saline basin regarded as the most potential potash-seeking ***,the origin and water circulation processes of saline springs have yet to be fully characterized in this saline *** this study,a total of 30 saline spring samples and 11 river water samples were collected from the Qiulitage Structural Belt(QSB)of the Kuqa *** were analyzed for major(K^+,Ca2^+,Na^+,Mg2^+,SO42-,Cl-and HCO3-)and trace(Sr2^+and Br-)ion concentrations,stable H-O-Sr isotopes and tritium concentrations in combination with previously published hydrogeochemical and isotopic(H-O)data in the same *** is found that the water chemical type of saline springs in the study area belonged to the Na-Cl type,and that of river water belonged to the Ca-Mg-HCO3-SO4 *** total dissolved solid(TDS)of saline springs in the QSB ranged from 117.77 to 314.92 g/L,reaching the brine *** the basis of the general chemical compositions and the characteristics of the stable H-O-Sr isotopes of saline springs,we infer that those saline springs mainly originated from precipitation following river water *** addition,we found that saline springs were not formed by evapo-concentration because it is unlikely that the high chloride concentration of saline springs resulted in evapo-concentration and high ***,we conclude that saline spring water may have experienced intense evapo-concentration before dissolving the salty minerals or after returning to the *** results show that the origin of salinity was mainly dominated by dissolving salty minerals due to the river water and/or precipitation that passed through the halite-rich ***,there are two possible origins

关键词： H-O-Sr isotopes tritium concentration saline springs meteoric water Qiulitage Structural Belt

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Evaluation of boron isotopes in halite as an indicator of the salinity of Qarhan paleolake water in the eastern Qaidam Basin, western China

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Geoscience Frontiers 2019年第1期10卷 253-262页

作者： Yongsheng Du Qishun Fan Donglin Gao Haicheng Wei Fashou Shan Binkai Li Xiangru Zhang Qin Yuan Zhanjie Qin Qianhui Ren xueming teng Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Key Laboratory of Salt Lake Geology and Environment of Qinghai Province University of Chinese Academy of Sciences Tianjin Center China Geological Survey

In this study, nineteen brine samples from the Qarhan Salt Lake(QSL) in western China were collected and analyzed for boron(B) and chlorine(Cl) concentrations, total dissolved solids(TDS), pH values and stable B isotopic compositions. The B concentrations and δ^(11) B values of brines in the QSL range from 51.6 mg/L to138.4 mg/L, and from +9.32& to +13.08&, respectively. By comparison of B concentrations and TDS of brines in QSL with evaporation paths of brackish water, we found that B enrichment of brines primarily results from strong evaporation and concentration of Qarhan lake water. Combining with comparisons of B concentrations, TDS, p H values and δ^(11) B values of brines, previously elemental ratios(K/Cl, Mg/Cl, Ca/Cl, B/Cl) and δ^(11) B values of halite from a sediment core(ISL1 A), we observe good correlations between B concentrations and TDS, TDS and pH values, pH and δ^(11) B values of brines, which demonstrate that higher B concentrations and more positive δ^(11) B values of halite indicate higher salinity of the Qarhan paleolake water as well as drier paleoclimatic conditions. Based on this interpretation of the δ^(11) B values of halite in core ISL1 A, higher salinity of the Qarhan paleolake occurred during two intervals, around 46-34 ka and26-9 ka, which are almost coincident with the upper and lower halite-dominated salt layers in core ISL1 A,drier climate phases documented from the δ^(18) O record of carbonate in core ISL1 A and the paleomoisture record in monsoonal central Asia, and a higher solar insolation at 30°N. These results demonstrate that the δ^(11) B values of halite in the arid Qaidam Basin could be regarded as a new proxy for reconstructing the salinity record of paleolake water as well as paleoclimate conditions.

关键词： B isotope compositions Brine Chemical concentrations Qarhan salt lake Western China Salinity of paleolake water

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地沟油的太赫兹波段光谱特性研究

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中国油脂 2013年第4期38卷 61-65页

作者：宝日玛赵昆滕学明李娟陆歆怡马娇中国石油大学(北京)理学院北京102249

基于太赫兹电磁波与油脂大分子基团的共振反应及太赫兹时域光谱技术能够灵敏地反映化合物结构与环境的指纹特性,应用该技术测量了普通食用油与多种地沟油的光学参数,得到了样品在0.16～0.96 THz频域的吸收谱和折射谱,分析了样品在太赫... 详细信息

基于太赫兹电磁波与油脂大分子基团的共振反应及太赫兹时域光谱技术能够灵敏地反映化合物结构与环境的指纹特性,应用该技术测量了普通食用油与多种地沟油的光学参数,得到了样品在0.16～0.96 THz频域的吸收谱和折射谱,分析了样品在太赫兹波段的光学性质,提出了地沟油和普通食用油在不同频率下的光谱差异。实验结果表明,太赫兹光谱信息可作为辨别地沟油与合格食用油的理化指标,可为地沟油的快速鉴别提供科学依据。

关键词：太赫兹时域光谱地沟油吸收系数折射率

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豫西卢氏五里川地区柳树湾铀矿碱交代成矿作用

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地球科学 2024年第4期49卷 1189-1206页

作者：冯晓曦滕雪明耿建珍中国地质调查局天津地质调查中心天津300170 华北地质科技创新中心天津300170 中国地质调查局铀矿地质重点实验室天津300170

豫西卢氏五里川地区新发现的柳树湾铀矿碱交代成矿作用明显,对于豫西成矿带新一轮找矿战略行动具有直接指示意义.通过岩石学、岩石化学和同位素定年等研究,认为早古生代中期,深源岩浆上侵、熔融、交代中元古代秦岭微陆块,形成富碱含铀... 详细信息

豫西卢氏五里川地区新发现的柳树湾铀矿碱交代成矿作用明显,对于豫西成矿带新一轮找矿战略行动具有直接指示意义.通过岩石学、岩石化学和同位素定年等研究,认为早古生代中期,深源岩浆上侵、熔融、交代中元古代秦岭微陆块,形成富碱含铀的灰池子岩体(429.4±5.3 Ma)和花岗伟晶岩(417.4±2.3 Ma);早古生代晚期,混有幔源成分的含U、Na、Zr、Hf流体和含U、K、Nb、Ta流体富碱流体交代花岗伟晶岩,塑造了柳树湾花岗伟晶岩铀矿床;富碱流体在改变了岩体及伟晶岩的碱质(K+Na)、硅质(SiO_(2))、REE和Zr、Hf、Ti等元素分布环境的过程中,导致锆石U-Pb、白云母Ar-Ar和辉钼矿Re-Os同位素封闭体系受损.碱交代作用是岩体、花岗伟晶岩成岩以及柳树湾铀成矿的根本原因.

关键词：豫西卢氏柳树湾铀矿岩石化学同位素测年碱交代作用矿床学

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大别山北缘定远组双峰式火山岩-新元古代晚期裂解事件记录

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地球科学 2021年第8期46卷 2732-2750页

作者：许雅雯李承东赵利刚孙烜烨许腾滕雪明中国地质调查局天津地质调查中心天津300170

为了了解大别山北缘构造属性,对定远组地层组成、形成时代及地球化学特征进行调查与研究.野外调查表明,定远组主要由一套变火山岩及云母片岩、云母石英片岩、浅粒岩、板岩等组成,其中变火山岩包括变玄武岩与变流纹质火山岩,并构成典型... 详细信息

为了了解大别山北缘构造属性,对定远组地层组成、形成时代及地球化学特征进行调查与研究.野外调查表明,定远组主要由一套变火山岩及云母片岩、云母石英片岩、浅粒岩、板岩等组成,其中变火山岩包括变玄武岩与变流纹质火山岩,并构成典型的双峰式火山岩建造;此外,还含有早古生代构造地层单位.运用LA-ICP-MS对酸性火山岩锆石进行U-Pb定年,获得725.7±1.4 Ma、736.6±5.4 Ma的年龄,形成时代为新元古代,不是前人认为的早古生代.变玄武岩分为低Ti(TiO2=1.19%)和高Ti(TiO2平均含量为3.11%)两种类型.低Ti玄武岩稀土总量较低(低于N-MORB),岩浆来自亏损的地幔源区.高Ti玄武岩又可以分为两种类型,一类富集Nb、Ta等元素,不相容元素的比值接近大陆裂谷玄武岩;另一种类型亏损Nb、Ta、Th、U等元素,岩浆可能来源于被下地壳或蚀变大洋地壳改造的地幔,其Th/Ta为1.6,与大陆裂谷玄武岩相当.总之,变玄武岩地球化学特征具有很大差别,是地幔源区不均一的反映.变酸性火山岩富集大离子亲石元素Rb、Ba、Th、U、K,亏损Nb、Ta、P、Ti等元素,锆石Hf同位素分析显示主体εHf(t)值为-3.0~-10,二阶段Hf模式年龄TDM2(Hf)为1630~2258 Ma,揭示其来源于古老地壳的部分熔融.定远组新元古代双峰式火山岩形成于大陆裂谷环境,并非岛弧构造背景.定远组双峰式火山岩及广泛分布的同时代岩浆岩,揭示了扬子陆块北缘在新元古代(800~611 Ma)时期一次重要的大陆边缘裂解-岩浆事件,是Rodinia超级古大陆裂解作用深部地球动力学的地表响应.

关键词：定远组双峰式火山岩新元古代裂解大别山北缘地质年代学地球化学

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北秦岭寨根地区富铌辉长岩地球化学特征及其构造意义

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地球科学 2019年第1期44卷 135-144页

作者：赵利刚李承东许雅雯武志宇常青松许腾滕雪明中国地质调查局天津地质调查中心天津300170 长庆实业集团陕西西安710016

富铌辉长岩往往与高镁闪长岩、埃达克岩共生,被认为是具有指相意义的岩石构造组合,但豫西地区北秦岭造山带南侧该类岩浆活动却很少被发现.对寨根地区秦岭岩群中的斜长角闪岩类进行岩石学、地球化学、同位素地球化学和年代学研究,在该深... 详细信息

富铌辉长岩往往与高镁闪长岩、埃达克岩共生,被认为是具有指相意义的岩石构造组合,但豫西地区北秦岭造山带南侧该类岩浆活动却很少被发现.对寨根地区秦岭岩群中的斜长角闪岩类进行岩石学、地球化学、同位素地球化学和年代学研究,在该深成杂岩中发现了富铌辉长岩,并且测得富铌辉长岩的变质锆石U-Pb年龄为484.3±1.8Ma,与区内超高压榴辉岩变质峰值年龄相近.富铌辉长岩地球化学特征表现为富集Rb、Th等大离子亲石元素,亏损Nb、Ta、P等高场强元素,εNd(t)介于-1.61～+0.49,相应的(87Sr/86Sr)i范围为0.714 273～0.723 936.推测其成因与秦岭古陆壳深俯冲过程中部分熔融的板片熔体交代地幔楔橄榄岩再熔融有关,经受深俯冲时有大量陆壳物质的加入,该发现为秦岭造山带早古生代早期存在多个微陆块提供了证据.

关键词：富铌辉长岩地球化学寨根秦岭造山带

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