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国家自然科学基金(40273009)

作品数:18 被引量:215H指数:9
相关作者:张铭杰胡沛青何天容仇广乐冯新斌更多>>
相关机构:兰州大学中国科学院中国科学院兰州地质研究所更多>>
发文基金:国家自然科学基金教育部“新世纪优秀人才支持计划”甘肃省自然科学基金更多>>
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18 条 记 录,以下是 1-10
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古大洋岩石圈地幔流体组成——来自玉石沟地幔橄榄岩的证据
2007年
  蛇绿岩底部地幔橄榄岩是认识古大洋岩石圈地幔流体的典型样品.采用分步加热质谱法测定了北祁连玉石沟蛇绿岩底部斜辉橄榄岩和纯橄榄岩矿物中流体的化学组成.……
胡沛青张铭杰孟广路傅飘儿李延鑫
箭石同位素及黑色页岩Mo/TOC特征与早侏罗纪多尔斯期古海洋演变的研究
<正>碳氧同位素组成已被广泛应用于研究大洋缺氧事件(OAE)的化学地层学和古温度的标志。本次研究选择英国北部约克郡多尔斯期海相地层中的沉积区间——中falciferum至下commune亚层,测定了箭石样品的稳定同位素值...
李琼John McArthur汤中立张铭杰李延鑫
关键词:箭石
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Compositions of Upper Mantle Fluids Beneath Eastern China: Implications for Mantle Evolution被引量:21
2004年
The composition of gases trapped in olivine, orthopyroxene and clinopyroxene in Iherzolite xenoliths collected from different locations in eastern China has been measured by the vacuum stepped-heating mass spectrometry. These xenoliths are hosted in alkali basalts and considered as residues of partial melting of the upper mantle, and may contain evidence of mantle evolution. The results show that various kinds of fluid inclusions in Iherzolite xenoliths have been released at distinct times, which could be related to different stages of mantle evolution. In general, primitive fluids of the upper mantle (PFUM) beneath eastern China are dominated by H2, CO2 and CO, and are characterized by high contents of H2 and reduced gases. The compositions of PFUM are highly variable and related to tectonic settings. CO, CO2 and H2 are the main components of the PFUM beneath cratons; the PFUM in the mantle enriched in potassic metasomatism in the northern part of northeastern China has a high content of H2, while CO2 and SO2 are the dominant components of the PFUM in the Su-Lu-Wan (Jiangsu-Shandong-Anhui) region, where recycled crustal fluids were mixed with deeper mantle components. There are several fluids with distinct compositions beneath eastern China, such as primitive fluids of upper mantle (CO, CO2 and H2), partial melting fluids (CO2 and CO) and metasomatic fluids mixed with recycled crustal fluids (CO2, N2, SO2 and CH4) etc. Fluids of the upper mantle beneath the North China craton are different from that of the South China craton in total gases and chemical compositions: the contents of the reduced gases of the PFUM in the NCC are higher than those in the SCC.
ZHANGMingjieWANGXianbinLIUGangZHANGTongweiBOWenrui
Helium and neon isotopic compositions in the ophiolites from the Yarlung Zangbo River,Southwestern China:The information from deep mantle被引量:29
2007年
The ophiolites from the Yarlung Zangbo River (Tibet), Southwestern China, were analysed for the contents of helium and neon and their isotopic compositions by stepwise heating. The serpentinites from Bainang showed a high 3He/4He value of 32.66R a (R a is referred to the 3He/4He ratio in the present air) in 700°C fraction. At lower temperature, all of the dolerites displayed as very high 3He/4He ratios as ones investigated for hotspots. It was clear that the high 3He/4He ratio was one of immanent characterics in the magma source formed the dolerites, suggesting that there was a large amount of deep mantle fluids in these rocks. In the three-isotope diagram of neon, the data points from the ophiolites of the Yarlung Zangbo River were arranged along the Loihi Line. This is in agreement with the characteristics of helium isotopes, revealing that the high-3He plume from deep mantle had played an important role in the formation of the Neo-Tethyan Ocean. The helium isotopic compositions in the basalts were far higher than atomospheric value but lower than the average value of MORB, although there were various degrees of alteration. The possible reasons were that basaltic magmas had been contaminated by crust-derived fluids.
YE XianRenTAO MingXinYU ChuanAoZHANG MingJie
关键词:RIVEROPHIOLITEHELIUMNEON
岩石热脱气单体碳/氢同位素组成分析装置被引量:7
2005年
研制了一套岩石热脱气装置,并将它与稳定同位素比质谱计连接,实现了岩石吸附气或包裹体气的单体碳、氢同位素组成分析。该装置的加热温度可达1100℃。样品收集过程中碳同位素基本不发生分馏。碳同位素组成测量结果的标准偏差≤1. 1‰,氢同位素组成测量结果的标准偏差≤9‰。
李立武张铭杰杜丽胡沛青房玄
关键词:分析装置岩石碳同位素组成同位素比氢同位素吸附气
古大洋岩石圈地幔流体组成——来自玉石沟地幔橄榄岩的证据
<正>蛇绿岩底部地幔橄榄岩是认识古大洋岩石圈地幔流体的典型样品。采用分步加热质谱法测定了北祁连玉石沟蛇绿岩底部斜辉橄榄岩和纯橄榄岩矿物中流体的化学组成。在已有岩石地球化学资料的基础上,根据不同类型包裹体的均一温度、流体的...
胡沛青张铭杰孟广路傅飘儿李延鑫
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红枫湖水体中活性汞和溶解气态汞的分布特征及其控制因素被引量:9
2008年
基于二次金汞齐结合冷原子荧光测定法对红枫湖活性汞(RHg)和溶解气态汞(DGM)的时空分布特征及其控制因素进行了研究.红枫湖溶解气态汞含量(ρ(DGM))为0.024-0.110 ng/L,随着水深的增加ρ(DGM)降低,且夏季高,冬季低,这种分布特征表明光在原子态汞的形成中起着重要的作用.红枫湖ρ(DGM)除受光强影响外,还受到春季后五大量生长的藻类影响,但与溶解性有机碳含量(ρ(DOC))及温度的相关性不大.活性汞含量(ρ(RHg))为0.14-2.70 ng/L,其主要受Hg^2+的光致还原过程,Hg^2+的甲基化过程以及人为源的释放等因素的控制.
何天容冯新斌郭艳娜孟博李仲根仇广乐
关键词:红枫湖
祁连古大洋岩石圈性质稀有气体同位素制约
祁连古大洋岩石圈性质具有明显的区域变化,祁连造山带蛇绿岩是认识古大洋岩石圈性质和环境的典型样品,稀有气体同位素对大洋岩石圈不同源区物质具有良好的示综作用。采用加热质谱法测定了祁连造山带玉石沟(YS)、清水沟(QS)和大岔...
胡沛青张铭杰贾元琴余明张茂超
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祁连造山带玉石沟地幔橄榄岩中挥发分的流体化学和稳定同位素组成及古大洋岩石圈演化意义被引量:10
2007年
Fluid inclusions in olivine and orthopyroxene of mantle peridotites from the Yushigou ophiolite can be divided into three types based on decrepitation temperature,shape and distribution.Type-1 fluid inclusions are characterized by oval or negative crystal shapes and small size(<5μm across).They occur in the cores and mantles of the host crystals,and decrepitated at>840℃.Type- 2 fluid inclusions have irregular or tabular shapes with relatively large size(10~100μm in length).They occur in irregular or circular healed micro-fractures in the host crystals,and decrepitated at 612~710℃.Type-3 fluid inclusions have size and shape,similar to type-2 fluid inclusions but occur in micro-fractures restricted to the margins of the host crystals,and decrepitated at much lower temperature from 190℃to 340℃.The three different types of fluid inclusions are interpreted to represent primary,metasomatic (pseudo-secondary)and secondary inclusions,respectively.Stepwise heating reveals three concentration peaks of volatiles at 200~400℃,400~800℃and 800~1200℃released from olivine and orthopyroxene in harzburgite and dunite from the Yushigou ophiolite, which are considered to correspond to the decrepitation of secondary,metasomatic and primary fluid inclusions at similar temperature ranges.CO2 is a major constituent in the volatiles released at three different temperature intervals.Trace amounts of H_2 and N_2 are present in the volatiles released at<800℃and trace amounts of H_2O and SO_2 are mainly present in the volatiles at 400~800℃.TheδD(-95.2‰,-306.3‰)of H_2O and theδ^(13)C(-15.5~-12.5‰)andδ^(18)O values(1.4~1.9‰)of CO_2 released at<800℃are lower than normal mantle values and suggest the mixing origin of crustal fluids( sedimentary organic)with ocean water,implying that Yushigou AOLM had undergone an intensive metasomatism by a fluid composed of CO_2.H_2O and SO_2,and followed by degassing. In contrast,the volatiles released at 800~1200℃are characterized by trace amounts of H_2 and
胡沛青张铭杰汤中立LI Chusi王记周
关键词:祁连造山带挥发分流体化学稳定同位素组成古大洋
中国云南晚古生代燧石和超镁铁熔岩的稀有气体组成模式
测定了云南西南部孟连、澜沧和云南中部大理的燧石、玄武岩、辉长岩和苦橄岩中的稀有气体含量和同位素组成。大理和孟连的硅质岩中,R(He/He)值为(0.108~0.183)×10(-6),比澜沧的(0.088×10)高。强烈...
叶先仁方念乔陶明信张铭杰王先彬
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