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1.
赣南寨背A型花岗岩体的地球化学特征及其构造地质意义 总被引：86，自引：9，他引：77
赣南寨背岩体主要为黑云母钾长花岗岩,黑云母结晶晚于长石和石英,锆石群型地温测量标尺显示其结晶温度为８００℃～９００℃,表明寨背岩体形成于一种高温贫水的花岗质岩浆。岩石的化学成分特点为准铝质（Ａｌ２Ｏ３为１２．２１％～１２．６２％）,富硅（ＳｉＯ２为７５．６６％～７６．７４％）,偏碱（Ｎａ２Ｏ＋Ｋ２Ｏ为７．９３％～８．９０％）,ＦｅＯＴ／ＭｇＯ值高（５９～１４８）,ＣａＯ和ＭｇＯ含量低（分别为０．１０％～０．６５％和０．０１％～０．０２％）,富含ＲＥＥ（Ｅｕ除外,ΣＲＥＥ平均为５００μｇ／ｇ）,Ｙ、Ｇａ、Ｎｂ等高场强元素（ＨＦＳＥ）以及Ｆ,Ｓｒ和Ｂａ较低。这些特点与本区的Ｉ型和Ｓ型花岗岩有明显差别,是一种典型的Ａ２型花岗岩。寨背岩体Ｒｂ－Ｓｒ等时线年龄为１７６Ｍａ,与辉长岩、双峰式火山岩有密切的时空关系,表明赣南地区在燕山早期即进入拉张裂解阶段。 相似文献
2.
混合表面活性剂存在下锰的高灵敏显色反应研究 总被引：2，自引：0，他引：2
研究了碱性介质中,Ｍｎ（Ⅱ）被空气氧化生成Ｈ２ＭｎＯ３,然后在Ｈ３ＰＯ４介质中,Ｃｕ（Ⅱ）和阳离子型有机相／水相微乳液（ＣＴＭＡＢ／戊醇／正庚烷／水）的存在下,Ｍｎ（Ⅳ）与二安替比林对乙氧基苯基甲烷（ＤＡｐＥＭ）生成橙色产物,λｍａｘ为４５０ｎｍ,ε＝１．９５×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ｍｎ（Ⅱ）的质量浓度在０～３２０μｇ／Ｌ内符合比尔定律。方法用于合金中锰的测定,结果与标准值符合,５次测定结果的ＲＳＤ＜３％。 相似文献
3.
铜—1—（2—吡啶偶氮）—2—萘酚络合物吸附波的研究 总被引：2，自引：0，他引：2
在ＰＨ６．２的ＮａＯＨ－ＫＨ２ＰＯ４介质中,Ｃｕ（Ⅱ）与１－（２－吡啶偶氮）－２－萘酚生成络合物,在线性单扫描示波极谱仪上于－０．２５Ｖ处出现一灵敏络合物吸附波。铜的质量浓度在１－４６０μｇ／Ｌ内与峰高呈良好线性关系,检出限０．５μｇ／Ｌ。 相似文献
4.
内蒙古兴和-卓资太古宙孔兹岩系变质峰期水活度、氧逸度及其化学位变化 总被引：5，自引：0，他引：5
通过脱水反应的平衡热力学计算确定内蒙古兴和－卓资太古宙孔兹岩系变泥砂质岩中变质峰期ａＨ２Ｏ 总体较低, 变化于０．１２～０．４０ 之间, 黑云紫苏片麻岩中ａＨ２Ｏ为０．２０～０．４３。前者的ｌｏｇｆＯ２ 值最高为－ １３～－ １５, 但在有些岩石中极低,（μＨ２ Ｏ／ＸＢｔＭ ｇ ）Ｐ,Ｔ和（μＯ２ ／ＸＢｔＭ ｇ ）Ｐ,Ｔ的系数主要变化于－ ０．２４１～－ ０．３８３ 和－ １．０５２～－ １．８１０,（μＨ２Ｏ ／μＯ２ ）Ｐ,Ｔ的斜率也有一定变化。这些数值变化特征按 “碳质变质”观点不应出现, 主要也不是脱水熔融作用所致, 它们可能与非完全开放系统中Ｈ２Ｏ较ＣＯ２ 易于逸散有关。 相似文献
5.
脱水反应的热力学计算确定本区太古宙麻粒岩系变质峰期水活度很低,太平寨地区富铝片麻岩和紫苏黑云片麻岩－麻粒岩中ａＨ２Ｏ值一般均在０．１０～０．２０之间,娄子山地区相对稍高,一般为０．１５～０．２５。全区峰期氧逸度ｌｇｆｏ２在－８～－１４之间。（эμＨ２Ｏ／эＸＭｇ＾Ｂｔ）和（эμＯ２／ＸＭｇ＾Ｂｔ）系数平均值太平寨地区分别为－０．２９３和－１．６０,娄子山地区分别为－０．３６４和－１．４２。全区αＨ２Ｏ很低,轴一地区上述各种数值相当均匀,不同地区则有一定差异,这些特征与“碳质变质”机理相符,说明峰期水活度可能受深源ＣＯ２流渗透的控制,属于外部缓冲性质。 相似文献
6.
在ＰＨ１０．３的ＮａＢ４Ｏ７－ＮａＯＨ介质中,Ｍｇ＾２＋与４,５－二溴苯基荧光酮形成络合物,于－０．９５Ｖ出现一灵敏的阴极波。Ｍｇ＾２＋的质量浓度在８．２－５８μｇ／Ｌ时与峰电流呈线性关系,检出限为２．１μｇ／Ｌ。 相似文献
7.
8.
青藏高原五道梁冻土活动层表面二氧化碳和甲烷的排放 总被引：9，自引：3，他引：9
通过静态箱取样方法，首次获得青藏高原冻土活动层排放气体。分析测定结果表明，ＣＨ４含量为０．６３～１．５４μｇ／ｇ，平均为１．１９μｇ／ｇ，大多数样品ＣＨ４含量低于当地大气ＣＨ４含量（１．３２μｇ／ｇ）；ＣＯ２含量为０．１５％～０．２７％，平均为０．２１％，明显高于大气ＣＯ２的浓度（０．０６９％）。ＣＨ４、ＣＯ２含量具有一定的日变化特征。ＣＨ４排放率为－０．０３２～０．０４８ｍｇｍ－２ｈ－１，平均为０．００１ｍｇｍ－２ｈ－１；ＣＯ２排放率为－５６．５０３～６１．４２５ｍｇｍ－２ｈ－１，平均为０．０９５ｍｇｍ－２ｈ１。从所获得的冻土排放气体中ＣＨ４和ＣＯ２的浓度来看，这种干燥寒冷的高原冻土活动层表面ＣＨ４排放较少，ＣＯ２的排放较高 相似文献
9.
地质样品中痕量碘的热解——示波极谱法测定 总被引：4，自引：1，他引：3
提出了在１０００℃高温中热解地质样品,以５ｇ／Ｌ ＮａＯＨ溶液为吸收液,以１０％ＮＨ３·Ｈ２Ｏ－３６ｇ／Ｌ ＮＨ４Ｃｌ溶液－２０ｇ／Ｌ Ｎａ２Ｂ４Ｏ７·６Ｈ２Ｏ溶液－１６ｇ／Ｌ Ｎａ２ＳＯ３溶液为底液,用二阶导数示波极谱测量痕量碘。方法的检出限为０．０８μｇ／ｇ,精密度（ＲＳＤ）为５．５％。经地质标准物质验证,测定值与推荐值吻合。 相似文献
10.
流动注射—催化光度法测定痕量锰 总被引：3，自引：0，他引：3
在非离子表面活性剂吐温－８０存在的Ｈ３ＰＯ４介质中，Ｍｎ＾２＋对Ｖ（Ｖ）氧化二安替比林苯乙烯甲烷（ＤＡＶＰＭ）成红色化合物的反应具有较强的催化作用，基于此采用流动注射－催化光度法测定了痕量Ｍｎ＾２＋，该方法的检测波长为５５５ｎｍ，检出限为０．０２μｇ／Ｌ Ｍｎ，线性范围为０．０２￣６μｇ／Ｌ Ｍｎ，进样频率为６０次／ｈ，对５μｇ／Ｌ Ｍｎ进行１０次测定的相对标准偏差为１．８％。经环境标准样品分析验 相似文献
11.
Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
12.
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
13.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
14.
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
15.
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
16.
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
17.
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
18.
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
19.
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
20.
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