湖南千里山花岗岩体的Nd－Sr同位素及岩石成因研究

本文利用Ｒｂ－Ｓｒ等时线方法测得第一阶段似斑状黑云母花岗岩、第二阶段等粒黑云母花岗岩和第三阶段花岗斑岩的成岩年龄分别为（１５２±９）×１０￣６ａ、（１３７±７）×１０￣６ａ～（１３６±６）×１０￣６ａ和（１３１±１）×１０￣６ａ。Ｓｒ－Ｎｄ同位素资料表明各阶段花岗质岩石均基本上源于地壳物质的重熔。与钨多金属矿化有关的似斑状黑云母花岗岩和等粒黑云母花岗岩属同一岩浆体系分异演化的产物，其钕模式年龄（ｔ＿（ＤＭ）＝２３０７×１０￣６ａ）反映出成岩物质来自早元古宙地层的重熔。与铅－锌－银矿化有关的花岗斑岩的钕模式年龄（ｔ＿（ＤＭ）＝１２８４×１０￣６～１５７８×１０￣６ａ）示意出其成岩物质来自中元古宙地层的重熔。     

激光采样电感耦合等离子体原子发射光谱法在地质样品测定中的应用

使用ＣＯ２激光器与ＩＣＰ－ＡＥＳ联接，实现了地质样品的固体采样分析，加入一定量的聚三氟氯乙烯，可基本消除样品组成及元素赋存状态的影响，改善了分析结果的准确度。测定了地质样品中的Ｂａ，Ｃｅ，Ｃｕ，Ｃｒ，Ｌａ，Ｍｎ，Ｎｂ，Ｓｃ，Ｓｒ，Ｔｉ，Ｙ，Ｙｂ和Ｚｒ等１４种元素，检出限０．１×１０＾－６至１０×１０＾－６，ＲＳＤ一般在３％－７％，最大为１０％，。     

小秦岭303号石英脉流体包裹体Rb—Sr,^40Ar—^39Ar成矿年龄测定

用石英流体包裹体Ｒｂ－Ｓｒ、＾４０Ａｒ－＾３９Ａｒ法测定了小秦岭３０３号石英脉的形成时代为石元古代。其流体包裹体属Ｈ２Ｏ＋ＣＯ２＋ＣａＣｌ型,盐度为６．５％－１２．９８％,ＣＯ２含量高,Ｎａ＾＋〉Ｋ＋。３０３号石英脉Ｒｂ－Ｓｒ等时线年龄为（２３８２±３３６）Ｍａ－（２２３４±４７）Ｍａ,（＾８７ｓＲ／＾８６Ｓｒ）ｉ为（０．７３５１±０．００１９）－（０．７４１６±０．０００４）,＾４０Ａｒ＾＾３９     

微型核反应堆中子活化分析测定地质样品中的卤素元素

研究了微堆中子活化分析测定地质样品中卤素元素的测量条件和测量中的影响因素，对超热中子活化分析测定Ｉ和Ｂｒ进行了实验研究，Ｆ，Ｃｌ，Ｂｒ，Ｉ的检出限分别为１０＾－３、７４×１０＾－６，１．７×１０＾－６，７．８×１０＾－６。ＲＳＤ〈１５％。     

河南元古宙爆破角砾岩型店坊金矿的黄铁矿特征及其生成条件

元古宙爆破角砾岩型店切坊金矿床中的黄铁矿是主要载金矿物,黄铁矿多为（１００）,属硫亏损型（Ｆｅ１．００００Ｓ１．８７７５－１．９８２１）Ｃｏ／Ｎｉ〉１（１．５－５．８７５）,热电系数导型为Ｎ型,δ＾３４Ｓ＝４．８‰～６．８‰,形成于温度较同（２２０～４３８℃）,氧逸度为ｌｏｇｆｏ２〈－３７×１０＾５Ｐａ硫逸度为ｌｇｆｓ２＝－３９．８５×１０＾５～－３５．６５×１０＾５Ｐａ,氧化还原条件发生变化的开     

中国东部幔源气体同位素地球化学

中国东部地幔岩包体及其单矿物中发育有大量的流体包裹体，采用阶段加热真空热爆的 方法脱出幔源包裹体中的气体，测试了气体的碳、氧、氦、氮等同位素组成。ＣＯ２的σ１３℃普遍较低， 主峰值为（－１８～－２２）×１０－3 ，多数样品在高温下的 σ１３℃普遍小于低温下的对应值。氧同位素变 化也很大，从－３．４×１０－３至２５．５×１０－３（ＳＭＯＷ），并呈现多峰的特征。σ１８Ｏ与σ１Ｃ３具有很好的相 关性，可能受控于同种分馏机制。Ｃ、Ｏ同位素组成特征表明，中国东部大陆地幔具有很大的化学不 均一性，可能是由地幔碳的多样性、源区的不均一性或地幔交代作用所致。氧同位素的变化可能是 结晶作用、去气作用或地壳物质混染所至。４Ｈｅ含量变化范围为（０．２４～２５．００）×１０－８，３Ｈｅ／４Ｈｅ变 化范围为（０．４６～１２．８０）×１０－６，４０Ａｒ含量从０．９７×１０－６到３４．１８×１０－６，４０Ａｒ／３６Ａｒ变化范围为 ２５０．５８～１２０２。３Ｈｅ／４Ｈｅ的变化反映了亏损地幔和富集地幔的存在。不同地区４０Ａｒ／３６Ａｒ的巨大差 异显示了地幔脱气程度的不同，也说明在地幔演化中Ａｒ、Ｈｅ同位素地球化学行为的差异。     

粤东塌山含锡花岗斑岩原生铝质矿物特征和成因

粤东塌山含锡花岗斑岩以岩脉产出，侵位年龄１３８Ｍａ，含不等数量的原生铝质矿物，如红柱石、铁铝榴石、铁叶云母和白云母等。根据产出特征，红柱石被区分为两个世代，石榴子石分为三个结晶时期。结合全岩为过铝质（Ａ／ＮＫＣ＝１．２３４），高的Ｋ２Ｏ／Ｎａ２Ｏ（２．１５）、Ｒｂ／Ｓｒ（３．１０）、Ｋ／Ｒｂ（２１５）比和ＩＳｒ值（０．７１３１），低的εＮｄ（Ｔ）值（－７．４）和长石铅同位素组成相似于造山带铅演化模     

辽宁桃源——小佟家堡子金矿带煌斑岩的地球化学特征及地质意义

桃源－小佟家堡子金矿带煌斑岩为不相容元素强烈富集型，不相容元素间分馏明显，高场强元素丰度较低，低场强元素丰度较高。稀土元素高度富集［ΣＲＥＥ为３５９．８—６６９．５（×１０－６）］，为强烈的右倾轻稀土元素富集型。对比研究表明，区内煌斑岩蚀变过程中Ｋ２Ｏ、ＴｉＯ２、Ｐ２Ｏ５等的含量较稳定，Ｓｉ、Ｃａ、Ｍｇ、Ｆｅ等元素有明显的带入带出。不太强烈的蚀变作用一般不会引起煌斑岩微量元素的明显带入带出，Ｎｂ、Ｚｒ、Ｙ等尤为稳定，岩石地质地球化学特征表明岩石为拉张构造环境形成。     

铜矿峪铜矿床地球化学的研究

详细地研究了铜矿峪矿床地球化学特征，得出铜矿床形成的ｐｂ－ｐｂ年龄为２１亿年；矿床形成温度为３５０℃，压力为４×１０￣７ｐａ～１×１０￣８ｐａ；Ｌｏｇｆｏ＿２：为－３１～－３１．８８，ｌｏｇｆｓ＿２为－５～－８；ｐＨ值为３．６～６．４；硫化物的δ￣３４Ｓ值为－４．５‰～０．２‰，δ￣３４Ｓ为＋１０‰；方解石的δ￣１３Ｃ为－４．８９‰～１．１‰，δ￣１３Ｃ为一４．２８‰，成矿流体主要为岩浆水，属于斑岩型铜矿床。     

五大连池火山区气体地球化学特征

根据泉（池）水中气体的组分和同位素组成,讨论了五大连池火山区气体的来源和运移。１９９７年８月从五大连池火山区泉中采用了９个气、水样品,同年９月测定了游离气和水溶气的气体组分、Ｈｅ同位素幽会和ＣＯ２的δ＾１３Ｃ值。气体以ＣＯ２为主,多数样品的ＣＯ２体积分类大于８０％。Ｈｅ和ＣＨ４的体积分数变化范围大,分别为０．７×１０＾－６－３８０×１０＾－６和４．０×１０＾－６－１８０×１０＾－６。＾３Ｈｅ／Ｈｅ     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

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.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

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.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ₁ roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).     

HYDROGEOLOGY

正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level     

METAMORPHIC PETROLOGY

正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7),     

SERIALS

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GEOPHYSICAL EXPLORATION

正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli-     

PETROLEUM GEOLOGY

正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.)     

GEOCHEMISTRY

正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861