含铁绿柱石的改色机制研究

含铁绿柱石经γ射线辐照或特定温度热处理,可因铁价态的改变引起颜色发生相应变化。处理前后的吸收光谱和顺磁共振谱研究表明,辐作用使隧道位的Ｆｅ＾２＋氧化Ｆｅ％３＋,八一位上的Ｆｅ＾３＋还原为Ｆｅ＾２＋,热处理使隧道位及八面体位Ｆｅ＾３＋均还原为Ｆｅ＾２＋。     

黄铁矿的穆斯堡尔谱特征及其机理分析

本区金矿中黄铁矿的Ｍｏ谱测试和综合分析表明，主要穆斯堡尔参数的变化与含金性之间存在有一定的关系。主要表现为，黄铁矿的Ｉ．Ｓ．值与含金性间呈明显的负相关。Ｏ．Ｓ．值与含金性间则呈明显的正相关，且Ｏ．Ｓ．值随着（Ａｕ＋Ａｓ）／（Ｃｏ＋Ｎｉ）原子数比值的增大而增大。这是由于Ａｕ＋取代Ｆｅ２＋进入黄铁矿晶格使其结构产生畸变所致。置换时电荷补偿可通过两个途径来实现，其一是Ａｕ＋（Ｃｏ３＋、Ｎｉ３＋）→２Ｆｅ２＋，其二是Ａｓ３＋＋Ａｕ＋→２Ｆｅ２＋。     

花园沟硼矿床中硼铝镁石的发现及其地质意义

在对辽宁省宽甸县花园沟硼矿床的研究中，发现了硼铝镁石，它与遂安石、袁复礼石、硬石膏等并生，产于硼矿体中．硼铝镁石是一种比较稀少的硼酸盐矿物，为此，对其进行了矿物特征的研究．硼铝镁石为黄色，粒状；晶体形态呈短柱状和权状，类似于橄榄石的晶体形态，弱多色性、Ｎｇ－淡黄、Ｎｐ－近于无色；折射率Ｎｇ＝１．７０７６，Ｎｐ＝１．６７０８，Ｎｍ＝１．６９６２；－２Ｖ＝５４°，Ｈ＝６－７，ＶＨＮ１００＝１２１５ｋｇ／ｍｍ２；Ｄ测＝３．５０．化学成分除Ａｌ和Ｍｇ外，其次是Ｆｅ２＋和Ｆｅ３＋，且Ｆｅ２＋＞Ｆｅ３＋晶体化学式为：晶体结构属斜方晶系，空间群ｐｎｍａ，ａ＝９．８９３（６）Ａ，ｂ＝５．０７６（４）Ａ，ｃ＝４．３３５（３）Ａ，Ｚ＝４．成因分析表明，硼铝镁石富Ａｌ、Ｍｇ、Ｂ，经角闪岩相区域变质作用形成．     

同步辐射X射线近边吸收谱法研究——二元金属重整催化剂中铂和铼的化学态

北京同步辐射装置（ＢＳＲＦ）提供同步辐射（ＳＲ）可调单色光，用Ｘ射线近边吸收谱法测得Ｆｅ３＋～Ｆｅ０和Ｎｉ３＋～Ｎｉ０的Ｋα吸收边能量位移分别为１０ｅＶ；Ｐｔ（Ⅳ）～Ｐｔ０的ＬⅢ吸收边能量位移为２ｅＶ；Ｒｅ（Ⅳ）～Ｒｅ０和Ｒｅ（Ⅶ）～Ｒｅ０的ＬⅢ吸收边能量位移分别为３ｅＶ和４ｅＶ，其化学位移测量的标准偏差为±０５１ｅＶ（２σ）。     

山东蓝宝石铁离子的价态及其对色调的影响

山东蓝色蓝宝石的着色是由Ｔｉ４＋离子与Ｆｅ２＋离子合理配比而成，一般控制在Ｔｉ４＋／Ｆｅ２＋＝１的配比范围内。多余的Ｆｅ２＋和其它Ｆｅ３＋离子存在都不利于蓝色蓝宝石正常呈色。通过穆斯堡尔谱和电子顺磁共振谱分析，测定了山东蓝宝石中铁离子的不同价态和浓度。对Ｆｅ２＋和Ｆｅ３＋离子所引起的吸收光谱特征作了研究，查明只有Ｆｅ３＋浓度很高时才产生４７７ｎｍ吸收峰，是致使山东蓝宝石表观上呈深蓝带黑色调的的重要原因。     

对用Fe^3＋／Fe^2＋探讨庐山地区第四纪古温度的讨论

本文认为用Ｆｅ＾３＋／Ｆｅ＾２＋值推算庐山地区第四纪古温度是可行的，但认为在推算方法上必须严谨合理，文中论证了用Ｆｅ２Ｏ３／ＦｅＯ值代替Ｆｅ＾３＋／Ｆｅ＾２＋值推算古温度，且用少量样品的实验分析结果来划分庐山地区第四纪冰期和间冰期地层是欠妥的，其计算结果误差达０．４１－４．３５。据笔者采用容量法对庐山大校场部面１０个样品Ｆｅ＾３＋和Ｆｅ＾２＋含量的测试，发现这些样品反映的第四纪古温度值未有低达０℃     

一种硼酸盐的新矿物─—袁复礼石

袁复礼石是一种Ｍｇ、Ｆｅ￣（３＋）、Ａｌ和Ｔｉ的硼酸盐新矿物，发现于辽宁省宽甸县砖庙硼矿区。该矿物黑色，近不透明，金刚光泽一半金属光泽。反射色亮灰，内反射深红褐色。非均质性弱，偏光色红褐。晶体呈细柱状，０．１×０．２×１ｍｍ。晶体化学式为：空间群：Ｈ＝５－６，ＶＨＮ＿（５０）＝８４３ｋｇ／ｍｍ￣２。｛１００｝解理完全。红外光谱吸收谱带为：１３８７，１２１０，１０２４，９５１，７３３，６００，５１０和４０８ｃｍ￣（－１）。穆斯堡尔谱证明，以三价铁为主，二价铁较少。Ｆｅ￣（３＋）占据Ｍ（１）晶位，Ｆｅ￣（２＋）占据Ｍ（１）和Ｍ（２）晶位。袁复礼石为硼钛镁石的富Ｆｅ￣（３＋）类似物。     

电化学分析法直接测定岩石矿物中的二价铁和三价铁

提出了在同一份样品溶液中采用电位滴定法和库仑滴定法分别直接测定Ｆｅ＾３＋和Ｆｅ＾２＋的方法。在实验确定的最佳条件下测定０．２０－５．００ｍｇ Ｆｅ＾３＋的ＲＳＤ％小于０．９０（ｎ＝５）；测定０．０３２－１０．０ｍｇ Ｆｅ＾２＋的ＲＳＤ％小于０．８６（ｎ＝５）。用岩石一级标准物质和单矿物标准物质检验并参加标准物质ＧＳＲ７－１２的协作定值，结果良好。     

长江与黄河沉积物中磁铁矿成分标型意义

长江与黄河沉积物中磁铁矿的元素组成揭示,两者的ＦｅＯ与Ｆｅ２Ｏ３及一些置换元素的含量差异明显。长江磁铁矿中ＦｅＯ与Ｆｅ２Ｏ３含量稍高于黄河磁铁矿,而Ｔｉ、Ｖ、Ｓｉ、Ａｌ、Ｃｒ、Ｍｇ及Ｍｎ等元素含量明显地低于黄河磁铁矿,元素含量变化显著小于黄河磁铁矿。这反映长江磁铁矿中Ｆｅ＾２＋及Ｆｅ＾３＋的类质同象置换较少,主要为均质相单矿物颗粒,而黄河磁铁矿中元素含量变化大,既有均质相的颗粒,也存在一些Ｆｅ＾２     

催化动力学光度法测定痕量铁的研究

研究了在ｐＨ８．５的Ｎａ２Ｂ４Ｏ７－ＨＣｌ介质中,Ｆｅ＾３＋催化Ｈ２Ｏ２氧化茜素红褪色,建立了动力学光度法测定痕量Ｆｅ＾３＋的方法。方法检出限０．０４３μｇ／ｍｌ,线性范围０￣０．１７μｇ／ｍｌ,除Ｍｎ＾２＋、Ｃｏ＾２＋等离子外,其余共存离子基本无干扰,实测了天然水和化学试剂中痕量Ｆｅ＾３＋,结果满意。     

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.     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

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.     

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.     

Late Wuchiapingian (Late Dzhulfian,early Late Permian) limestone olistolites within the Tertiary flysch of Glypia Unit (Mount Parnon,central–eastern Peloponnesus,Greece)

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.     

PALEONTOLOGY

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.)     

GEOCHEMICAL EXPLORATION

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.)     

MICROPALAEONTOLOGY

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.)     

PETROLOGY

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.,     

ENVIRONMENTAL GEOLOGY

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     

PROSPECTING EXPLORATION

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