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河北沧州和山东烟台地区某些天然水的稳定氯同位素组成 总被引:3,自引:1,他引:3
氯元素有两个稳定同位素:^35Cl(75.77%)和^37Cl(24.23%)。过去一直认为稳定氯同位素的比值(^37Cl/^35Cl)几乎不变。80年代以来利用高精度质谱法成功地发现了自然界氯同位素分馏作用。各地不同深度海水的氯同位素组成极为一致,故以标准平均海水氯(SMOC)作为对比标准。河北沧州和山东烟台地区地下淡水和热水的δ^37Cl为-1.50 ̄+0.80‰,深层油田卤水的δ^37Cl为 相似文献
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大柴达木盐湖硼同位素地球化学研究 总被引:11,自引:0,他引:11
以测定Cs2BO2^+离子的热电离质谱法,用VG-354型质谱计测定了大柴达木盐湖卤水及其外围水系的硼同位素组成。其卤水的δ^11B值为+4.96‰-+9.11‰,外围水系的δ^11B值为-3.85% ̄-42.68‰。同时也测定了其湖底沉积物,外围碳酸盐泉华和硼酸盐的硼同位素组成,它们的δ^11B值分别为-17.78‰ ̄+2.56‰、-31.97‰ ̄+0.17‰和-11.87‰ ̄-9.59‰。这些 相似文献
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河北平原第四系咸水同位素组成 总被引:7,自引:0,他引:7
本文讨论了河北平原地下咸水的同位素组成。并且依据水文地质、水化学和同位素特征将咸水成因分为两种类型,即大陆盐化成因和海水成因咸水。前者δ18O<-7.00‰,δD<-55.0‰,36Cl/Cl>57±9(×10-15),14C年龄为1000~4000a(校正);后者δ18O>-7.00‰,δD>-55.0‰,δ37Cl值接近海水值,14C年龄大于10000a(校正),咸水中的海水百分比大于38.0%。 相似文献
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云南兰坪三山—白身坪铜银多金属成矿富集区的碳氧同位素地球化学 总被引:9,自引:0,他引:9
研究区的碳氧同位素组成表明,矿化灰岩和细晶灰岩的δ^13C为正值,其δ^18O值变化于-6.4‰~-21‰之间;而绝大多数矿石中碳酸盐矿物的δ^13C为负值,只有少数为正值,与其对应的δ^18O值为-12.3‰~-12.5‰。根据δ^13C-δ^18O图解分析,区分出了3种不同类型的碳同位素:(1)三叠纪海洋生物碳;(2)海相碳酸盐的碳与热卤水中碳的过渡类型;(3)深部热卤水中CO2的碳。研究发现 相似文献
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中国东南部花岗岩的碳含量和同位素比值 总被引:1,自引:0,他引:1
本文应用EA-MS连续技术(将元素分析仪(EA)与气体质谱仪(MS)连接起来,进行硅酸盐岩石微量碳的含量和同位素比值测定)首次测定了中国东南部花岗岩及其部分磷灰石的全碳含量和同位素组成,结果发现,这些花岗岩的碳含量和同位素组成分布较宽(碳含量为0.04%~0.79%,δ^13C值为-7.5‰~-37.0‰)。磷灰石与全岩的δ^13C呈正相关关系,指示自花岗岩浆上升到结晶以来未受到同化混染或热液蚀变 相似文献
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扬子地台震旦纪海水碳同位素的变化 总被引:15,自引:1,他引:15
本文测定了湖北宜昌三峡剖面震旦系海相碳酸盐岩样品的碳同位素组成。研究表明:震旦纪扬子区海水的δ^13C值显示出大幅度变化,南沱冰期δ^13C为低值(-4‰);陡山沱早期δ^13C值迅速上升,达到5-6‰,陡山沱期δ^13C值一般在0-5‰之间;灯影期δ^13C值较平稳,一般在2.0-3.4%之间,导致震旦经水δ^13C值大幅度变化的原因主要是由于以疑在和近岸为藻类等光合作用的海洋植物群体为主体的大 相似文献
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中国东部地幔CO2流体包裹体的碳同位素初步研究 总被引:21,自引:2,他引:21
采用分步加热爆裂法收集中国东部11个地点的新生代玄武岩中13个富CO2流体包裹体捕捞体(包括12个橄榄岩和1个麻粒岩)的CO2,做了碳同位素测定,800℃的δ^13C主要集中分布于-16.0‰--22.0‰,1100℃的δ^13C主要集中分布于-21.0‰-29.0‰。初步结果表明,地幔演化不同阶段的流体CO2碳同位素组成不同。 相似文献
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对矿区硅质岩样品做了硅、氧同位素测定,其δ^30Si值为0.4-1.7‰;成岩流体水的δ^18O值为-2.7-1.1‰。根据地球化学特征和硅、同位素分析,提出硅质岩为浅海和半深海热水沉积。 相似文献
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中国东部橄榄岩包体和榴辉岩中CO2流体包裹体的碳同位素组成 总被引:9,自引:0,他引:9
应用阶段段加热技术,对中国东部新生代玄武岩中的橄榄岩包体和大别造山带超高压榴辉岩进行了裹体CO2的碳同位素组成测定,结果表明,榄岩的δ^13C值变化较大,从-22.8%到+0.7‰到+4.6‰,同样明显不同于前人报道的低δ^13C值(-30‰20~-20‰)特征,大别造山带榴辉岩的δ^13C变化从-18.5‰到+4.6‰,同样明显不同于前人报道的低δ^13C值(-30‰~-20‰)特征。榴辉;岩的 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931. 相似文献
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正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.) 相似文献
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正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.) 相似文献
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正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.) 相似文献
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正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus., 相似文献
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正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an 相似文献
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正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of 相似文献
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正20140582 Fang Xisheng(Key Lab.of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China);Shi Xuefa Mineralogy of Surface Sediment in the Eastern Area off the Ryukyu Islands and Its Geological Significance(Marine Geology Quaternary Geology,ISSN0256-1492,CN37 相似文献
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正20141810 Bian Yumei(Geological Environmental Monitoring Center of Liaoning Province,Shenyang 110032,China);Zhang Jing Zoning Haicheng,Liaoning Province,by GeoHazard Risk and Geo-Hazard Assessment(Journal of Geological Hazards and Environment Preservation,ISSN1006-4362,CN51-1467/P,24(3),2013,p.5-9,2 illus.,tables,refs.) 相似文献