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Carbon and Oxygen Stable Isotope Values and Microfossils at 41.4-4.5ka BP in Tai Co,Tibet,China,and Their Paleoclimatic Significance

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Acta Geologica Sinica(English Edition) 2011年第5期85卷 1036-1050+1052-1056+1051页

作者： zheng mianping~(1,2.*),LIU Junying~(1,3),MA Zhibang~(1,4),WANG Hailei~(1,2. and MA Nina~(1,2. 1 MLR Key {2. of saline lake resources and environment,institute of mineral resources,CAGS, beijing 100037,China 2.Research and Development Center for saline lakes and Epithermal Deposits,chinese academy of geological sciences,beijing 100037,China 3 institute of Geology,chinese academy of geological sciences,beijing 100037,China 4 Key {2. of Cenozoic Geology and environment,chinese academy of sciences,beijing 10002., China MLR Key laboratory of saline {2. resources and environment Institute of Mineral Resources CAGS Beijing 100037 China Research and Development Center for saline lakes and Epithermal Deposits Chinese Academy of Geological Sciences Beijing 100037 China institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Key laboratory of Cenozoic Geology and environment Chinese Academy of Sciences Beijing 100029 China

Two sedimentary sections were measured at Tai Co(Co means lake in Tibetan) in western Tibet,*** two sections are almost all composed of clay carbonate beds except in their lower parts where there are carbonized plants at>10 cm depths and dark-colored carbonate clay and clay at 50-70 cm depths,yielding abundant gastropods,ostracods,and *** carbon and oxygen stable isotope values of carbonate,ostracods,and charophytes and ecological features of microfossil communities indicate the following climatic change in the area from 41.4 to 4.5 ka BP:at 41.4-2..2.ka BP,the climate was relatively wet;at 2..2.2..5 ka BP,it was slightly warm-dry;at 2..5-2..5 ka BP,it was warm-wet;at 2..5-2..0 ka BP,it was slightly cold-wet;at 2..5-17.5 ka BP,it became cold abruptly and slightly wet,implying the climate of the last glacial maximum;at 17.5-16.0 ka BP,it was slightly cold-dry;at 16.0-11.8 ka BP,it was slightly warm-wet;at 11.8-10.4 ka BP,it was relatively cold-dry, roughly equivalent to the climate of the Younger Dryas,and at 10.4 ka BP,the temperatures began to rise again;at 10.4-9.4 ka BP,it was slightly warm-wet;at 9.4-8.5 ka BP,there occurred short warm-wet oscillations;at 8.5-7.9 ka BP,it was slightly dry-cold,representing a strong temperature-lowering and drying event in the postglacial stage;at 7.8-6.3 ka BP,it was slightly warm-wet;at 6.3-4.5 ka BP,the climate tended to be cold-dry.4.5 ka BP recorded the maximum aridity since the late part of the late Pleistocene.

关键词： sedimentary environment index paleoclimatic changes late Pleistocene-Holocene(41.4-4.5 ka BP) Tai Co Tibet

Cesium accumulation by bacterium Thermus sp. TibetanG7:hints for biomineralization of cesium-bearing geyserite in hot springs in Tibet,China

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chinese Science Bulletin 2007年第19期52卷 2680-2686页

作者： WANG HaiLei1,2,3, zheng mianping1,2,3 & HUANG XiaoXing4 1 institute of mineral resources, chinese academy of geological sciences (CAGS), beijing 100037, China 2 R&D Center for saline lake and Epithermal Deposits, CAGS, beijing 100037, China 3 Open laboratory of saline lake Resourses and environment, CAGS, beijing 100037, China 4 laboratory of Microbial resources, institute of Microbiology, chinese academy of sciences, beijing 100081, China institute of mineral {2. Chinese Academy of Geological Sciences (CAGS) Beijing China R&D Center for saline lake and Epithermal Deposits CAGS Beijing China Open laboratory of saline {2. Resourses and environment CAGS Beijing China laboratory of Microbial resources Institute of Microbiology Chinese Academy of Sciences Beijing China

The bacterium Thermus sp. TibetanG7, isolated from hot springs in Tibet, China, was examined for the ability to accumulate cesium from solutions. environmental conditions were simulated and the effects of pH, K+, Na+ and K+-regimes were then studied to determine the possible role of the bacterium in the formation of cesium-bearing geyserite around these hot springs. In despite of the inhibition of K+ and Na+, the bacterium Thermus sp. TibetanG7 revealed noticeable accumulation of cesium from solutions, with maximum accumulations of 53.49 and 40.41 μmol Cesium/g cell dry weight in Na+ and K+ inhibition experiments, respectively. The accumulation of cesium by this microorganism is rapid, with 40%―50% accumulated within the first 5 min. K+-deficient cells showed a much higher capacity of cesium accu- mulation compared with K+-sufficient cells. It is evident that the bacteria within the genus thermus play a significant role in the cesium assembly. The formation of cesium-bearing geyserite is also considered.

关键词：铯元素沉积物硅华生物矿化

Primary Study on Quantitative Reconstruction of Middle-Late Eocene Climate in Jianghan Basin

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Journal of China University of Geosciences 2002年第3期13卷 252-259页

作者： Tong Guobang Liu Zhiming institute of Hydrogeology and environmental Geology, chinese academy of geological sciences, zhengding 050803 Open laboratory of saline lake resources and environment, chinese academy of geological sciences, beijing 100037 zheng mianping institute of mineral resources, chinese academy of geological sciences, beijing 100037 Research & Development Center of saline lake and Epithermal Deposit, chinese academy of geological sciences, beijing 100037 Wang Weiming Nanjing institute of Geology and Palaeontology, chinese academy of sciences, Nanjing 210008 institute of Hydrogeology and environmental Geology Chinese Academy of Geological Sciences Zhengding 050803 Open laboratory of saline {2. resources and environment Chinese Academy of Geological Sciences Beijing 100037 institute of mineral {2. Chinese Academy of Geological Sciences Beijing 100037 Research & Development Center of saline lake and Epithermal Deposit Chinese Academy of Geological Sciences Beijing 100037 Nanjing institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008

This paper reports our primary effort in the quantitative reconstruction ofpaleoclimate based on the thrine in phytoecology of the affinity parent plants in the stratigraphicpollen records. The Eocene pollen data come from our former study on the Mingjia borehole 1 in theJianghan basin. The fluctuating trend in the parameter curve of climate shows that the climate inthe Middle Eocene in the Jianghan basin was more or less comparable with that of the present2.°―2.°N, characteristic of a humid, semi-humid central-southern subtropical climate. The annualtemperature at that time dropped by 1 ℃― 4 ℃ in the Late Eocene, approximately equal to that ofthe present 2.°―2.°N of northern-central subtropical climate. However, the climate composite atthat time, characterized by higher temperature, small annual range and big fluctuation inprecipitation, was quite different from the present one. The average temperature in January in theMiddle Eocene, higher than that of today, ranged between 5 ℃ and 9 ℃, indicating that no effect ofwinter monsoon occurred in the Middle Eocene, though such an effect may have occurred occasionallyin the Late Eocene. Major temperature decline is recognized at the depth of 2.100 m in the borehole,as was indicated by the decline in average January temperature, the increase in annual range, andthe increase in the deciduous broad-leaved types of trees in the spore-pollen assemblage. The sharpfluctuation in the annual precipitation, usually raging from 300 to 1 700 mm, was favorable for themigration and accumulation of salty deposit. When the precipitation was lower than 1 000 mm,ephemera shrub increased at the same depth as that of the salty deposit. It is, therefore, deducedthat the formation of the salty deposit was attributed mainly to the dry and hot environment in thehigh mountains and deep basins. The small annual precipitation and the intense fluctuation arefavorable for the sustainable accumulation of the salts, which is different from the present

关键词： quantitative reconstruction of paleoclimate annual range function ofthrine in phytoecology fuzzy mathematics eocene jianghan basin

Cymbella Agardh属(硅藻门Bacillariophyta)的一个新化石种的发现及其微细构造

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微体古生物学报 2003年第4期20卷 435-438页

作者：李家英魏乐军郑绵平中国地质科学院地质研究所北京100037 中国地质科学院矿产资源研究所

新化石种 Cymbella taicuonensis L i et zheng ***.是在研究西藏西北部日土县台错古湖剖面沉积物中硅藻植物群时发现的 ,剖面沉积物中保存了非常丰富的硅藻化石 ,Cymbella taicuonensis就是这些硅藻化石中的一个新化石种。对标本采用... 详细信息

新化石种 Cymbella taicuonensis L i et zheng ***.是在研究西藏西北部日土县台错古湖剖面沉积物中硅藻植物群时发现的 ,剖面沉积物中保存了非常丰富的硅藻化石 ,Cymbella taicuonensis就是这些硅藻化石中的一个新化石种。对标本采用光学镜 (L M)和扫描电镜 (SEM)观察和照相。

关键词：硅藻分类台错西藏

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西藏台错晚第四纪轮藻类的新类型

微体古生物学报 2011年第2期28卷 145-168页

作者：刘俊英王海雷国土资源部盐湖资源与环境重点实验室北京100037 中国地质科学院盐湖与热水资源研究中心北京100037 中国地质科学院地质研究所北京100037 中国地质科学院矿产资源研究所北京100037

本文的研究材料来自西藏羌塘高原西部台错古湖一个3.69 m的天然剖面,其地层测年为32.6—4.5ka。从其156个样品中获取大量的轮藻类、介形类和腹足类及少量有孔虫等微体化石。据轮藻类藏卵器外形,顶部结构、螺旋细胞钙化式样等特征,该剖... 详细信息

本文的研究材料来自西藏羌塘高原西部台错古湖一个3.69 m的天然剖面,其地层测年为32.6—4.5ka。从其156个样品中获取大量的轮藻类、介形类和腹足类及少量有孔虫等微体化石。据轮藻类藏卵器外形,顶部结构、螺旋细胞钙化式样等特征,该剖面的轮藻类应归属于轮藻科Characeae之轮藻属Chara。经研究得知,台错古湖在大约2. ka的时期内,曾生长过2.种轮藻,其中新类型7个,包括新种4个:Chara platea,***,***和***;新型2.:***,***;新变种1个:***。其余是曾产于国内外第四系的Chara其它分子。其中有5个新联合种:Chara alba(Madler et Staesche),***(Tang et Di),***(Tang et Di),***(Tang etDi)和***。该剖面轮藻类、介形类、腹足类等多门类微体化石的紧密共生,对轮藻植物群生态学研究具重要意义。

关键词：轮藻类新类型晚第四纪台错西藏

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西藏扎布耶盐湖太阳池的建造与运行试验

太阳能学报 2010年第2期31卷 163-167页

作者：黄维农王学魁孙之南乜贞沙作良天津科技大学海洋科学与工程学院天津300457 西藏扎布耶锂业高科技有限公司拉萨850000 中国地质科学院矿产资源研究所北京100037 国土资源部盐湖与环境开放研究实验室北京100037

介绍了西藏扎布耶盐湖面积为3588m^2.阳池的建造与运行试验,获得了扎布耶盐湖太阳池运行过程中的温度和盐度分布情况,找到了不同时期简单实用的梯度层构建方法。基于当地条件,扎布耶盐湖太阳池的构建费用低,使用淡水量小,梯度层薄(30～... 详细信息

介绍了西藏扎布耶盐湖面积为3588m^2.阳池的建造与运行试验,获得了扎布耶盐湖太阳池运行过程中的温度和盐度分布情况,找到了不同时期简单实用的梯度层构建方法。基于当地条件,扎布耶盐湖太阳池的构建费用低,使用淡水量小,梯度层薄(30～50cm);下对流层(LCZ)较厚,直接使用盐田日晒卤水,一般达2.0～2.0cm;运行周期短(约1个半月～2.月);升温幅度低(约30～40℃);不需要复杂的辅助和维护设施。其成功运行为扎布耶盐湖锂资源的开发提供了热源。

关键词：扎布耶盐湖太阳池运行试验

HOLOCENE saline SEDIMENTARY RECORD IN TIBETAN DONG CO(lake) AND ITS SIGNIFICANCE ON PALAEOCLIMATE

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地学前缘 2000年第S1期7卷 378-378页

作者： Wei Lejun 1,2.,zheng mianping 2.3 [WT5,5”BX](1 China University of Geo{2.,beijing 100083,China 2.Open laboratory of saline lake resources & environment ,chinese academy of geological {2.,beijing 100037,China 3.institute of Min

Based on the sedimentary characteristics study of Holocene borax\|bearing mirabilite beds of Dong Co(lake) two sections, DZ01 and DZ02. in the center of North\|Tibetan Plateau,combined with dating of 14 C, applied theory and method of comparative salinology, it is determined that the palaeoclimate framework of Dong Co during early\|middle Holocene, and reckoned the range of the temperature variation. Furthermore, after completing regional analogue, discovered that the palaeoclimate environment is fully comparative and consistent with the synchronous lake\|water retreating trace of Zhaduixiong spits in Zabuye lake basin, with palaeoclimate changes recorded by pollen in adjacent Zabuye lake, with Holocene plaeoclimate environment indicated by drilling\|hole in Bangong Co,with palaeoclimate significance traced by δ 18 O value in Qinghai lake and Siling Co and with the palaeoclimate framework during the 5th Level Arid (Salinization) Extension Period of Quaternary arid center of Western China.

关键词： Dong Co Tibet Holocene sedimentary record palaeoclimate change s

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青藏高原盐湖反风化作用与关键元素循环

地球学报 2024年第5期45卷 777-790页

作者：林勇杰郑绵平中国地质科学院矿产资源研究所、自然资源部盐湖资源与环境重点实验室北京100037

盐湖环境中的反风化(reverse weathering,又称逆风化)是指逆向的化学风化作用,通常指盐湖内部自生黏土矿物或碳酸盐矿物的形成过程,是控制盐湖关键元素地球化学循环的重要机制。青藏高原是地球上关键的盐湖区,既是内陆生态系统重要的碳... 详细信息

盐湖环境中的反风化(reverse weathering,又称逆风化)是指逆向的化学风化作用,通常指盐湖内部自生黏土矿物或碳酸盐矿物的形成过程,是控制盐湖关键元素地球化学循环的重要机制。青藏高原是地球上关键的盐湖区,既是内陆生态系统重要的碳库,又富含锂、钾、铷、铯等关键矿产资源。青藏高原盐湖的水化学类型多样,包括碳酸盐型、硫酸盐型和氯化物型,不同的水化学特征决定了盐类和黏土矿物的种类及其形成机制的差异。本文综述了盐湖环境中硅酸盐和碳酸盐反风化作用的研究进展,并探讨青藏高原盐湖反风化作用对关键元素地球化学循环的影响。青藏高原盐湖中自生黏土矿物的形成(如伊利石)是对盐湖卤水锂、钾、铷、铯等关键元素最重要的消耗机制;而碳酸盐的形成对关键金属元素消耗影响很小,除非形成含关键金属元素的独立矿物,如扎布耶石。自生黏土矿物和碳酸盐的形成均会显著影响湖泊的无机碳循环。目前,盐湖反风化作用程度的量化、控制因素解析和对关键元素损耗的影响程度是盐湖矿产资源研究的关键问题。当前非传统稳定同位素技术的快速发展为盐湖反风化研究提供了新机遇。青藏高原盐湖是反风化研究的天然实验室,开展盐湖反风化研究不仅可以深入理解青藏高原盐湖的关键金属元素成矿作用及碳循环过程,而且有助于丰富反风化理论。

关键词：盐湖反风化作用关键金属元素循环碳循环青藏高原

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拉萨地块钾质-超钾质火山岩或为高分异岩石:来自铷、铯富集的证据

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地球科学 2024年第3期49卷 850-867页

作者：车东郑绵平赵元艺张照志中国地质科学院矿产资源研究所自然资源部盐湖资源与环境重点实验室北京100037

青藏地区拉萨地块、羌塘地块、松潘甘孜-可可西里地块中,广泛发育后碰撞以来的钾质-超钾质火山岩.在上述众多钾质-超钾质火山岩研究数据中,拉萨地块的Rb、Cs等稀碱元素的超常富集程度远高于其他两地块,为了将此现象量化表述,并且尝试对... 详细信息

青藏地区拉萨地块、羌塘地块、松潘甘孜-可可西里地块中,广泛发育后碰撞以来的钾质-超钾质火山岩.在上述众多钾质-超钾质火山岩研究数据中,拉萨地块的Rb、Cs等稀碱元素的超常富集程度远高于其他两地块,为了将此现象量化表述,并且尝试对富集原因进行探究.本文通过实测和已公开发表的数据,运用箱线图等统计方法,以及系统的矿物学、地球化学分析手段,量化了三大地块稀碱元素富集程度,对富集成因有了初步认识.结果表明拉萨地块钾质-超钾质火山岩存在较高程度的岩浆分异是导致Rb、Cs等稀碱元素超常富集的主要原因,超常富集区主要分布于火山岩年龄范围为2.~13 Ma之间的拉萨地块中西部.并且类比高分异花岗岩的研究成果划分了拉萨地块钾质-超钾质火山岩较高程度分异的Zr/Hf和Nb/Ta判别范围.

关键词：拉萨地块钾质-超钾质火山岩稀碱元素富集高分异西藏矿物学地球化学