共查询到20条相似文献，搜索用时 93 毫秒
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《大地构造与成矿学》2006,30(4):527-531
第1期●构造地质学贺西地区中-晚古生代盆地性质刍议……………………………………………………………………………高山林,张进(1)桂北-桂东加里东期盆地构造沉降史分析………………………………陈懋弘,梁金城,张桂林,李文杰,潘罗忠,李容森(9)鄂东南地区印支期以来构造变形特征 相似文献
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《地质科技情报》2006,25(6):I0001-I0003
·基础地质·南非陆相二叠系—三叠系界线研究进展…………………………………彭元桥,高勇群,杨逢清,等(1-1)黔桂地区深水相二叠系—三叠系界线附近黏土岩研究…………………………………张素新,冯庆来,顾松竹,等(1-9)新疆诺尔特地区阿提什花岗岩体岩浆演化动力学…………………………………袁峰,周涛发,谭绿贵,等(1-14)内蒙古海拉尔盆地大磨拐河组孢粉化石及其时代浅析…………………………………黄清华,赵来时,卢占武,等(1-19)锆石地球化学特征及地质应用研究综述……………………………………钟玉芳,马昌前,佘振兵(1-27)长江中游砂山的粒… 相似文献
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《华北地质》2002,(Z1)
冀东冀西与岩浆隐爆作用有关的绿岩带再生型金矿床特征沈保丰 ,李俊建 ,等 ( 1 )………………………地幔热柱及其成矿作用研究牛树银 ,孙爱群 ,谢汝斌 ,等 ( 1 1 )………………………………………………华北板块南缘韧性推覆剪切带的发现及大地构造意义王沛成 ,张国茹 ,徐洪岩 ,等 ( 2 3)…………………燕辽地区中、晚元古代宏观藻类化石研究牛绍武 ( 2 8)………………………………………………………柴北缘绿梁山地区辉长岩的锆石Ｕ -Ｐｂ年龄及意义袁桂邦 ,王惠初 ,郝国杰 ,等 ( 36)……………………豫西地区熊耳群的地质年代学研究任富根… 相似文献
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《新疆地质》2005,23(4):I0005-I0007,I0008
综合评述2004年新疆地质矿产勘查进展及2005年工作思路………………………………………………………………………………………董连慧,冯京,李凤鸣(1-1)基础地质雅拉香波穹隆韧性剪切带变形特征与剪切作用类型研究…………………………………………………………………………………张波,张进江,郭磊(1-4)地幔岩中不同产状的流体-熔体包裹体及地幔流体交代作用………………………………………………………………………谢玉玲,潘琳,徐九华,等(1-10)东准噶尔纸房地区晚石炭世巴塔玛依内山组陆相火山-沉积体系特征………………………………………… 相似文献
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《贵州地质》2006,23(4):323-324
第1期(总第86期)[青藏高原地质]青藏高原北缘昆仑—羊湖地区构造演化特征…………………………………戴传固,李硕,边申武(1)新疆云雾岭地区花岗岩主量元素特征及构造环境判别…………………王敏,戴传固,牟世勇,等(5)藏西南仲巴一带古人类活动遗迹的发现与研究…………………………张振利,李广栋,孙肖,等(12)西天山阿沙勒河中上游二叠系的发现及环境分析………………………黄勇,邓贵标,跃连红,等(20)青藏羌塘地块他利克甘利山早三叠纪牙形刺的发现及地质意义……………朱勋,易成兴,陈仁(25)羌塘才玛尔错晚三叠世地层的厘定及其意义……………… 相似文献
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《地质与勘探》2002,(6)
(期—页 ) (期—页 )专家论坛矿产勘查与评估的统计地球化学方法蒋 志 (1— 1 )………油气地质异常与非传统油气资源勘探研究赵鹏大 ,汤 军 ,陈建平 ,等 (2— 1 )……………………保证国家资源安全的矿产资源基础研究思考赵振华 (2— 6 )……………………………………………超大型Ｎｉ-Ｃｕ(Ｐｔ)岩浆矿床的划分与找矿汤中立 (3— 1 )……………………………………………中国ＰＧＥ矿床类型分析刘秉光 (4— 1 )……………………中国区域成矿特征探讨翟裕生 (5— 1 )………………………勘查地球化学 :发展史·现状·展望谢学锦 (6— 1 )…… 相似文献
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Kunaljeet S. Tanwar Sarah C. Petitto Peter J. Eng 《Geochimica et cosmochimica acta》2009,73(15):4346-2587
The surface structure of α-Fe2O3(0 0 0 1) was studied using crystal truncation rod (CTR) X-ray diffraction before and after reaction with aqueous Fe(II) at pH 5. The CTR results show the unreacted α-Fe2O3(0 0 0 1) surface consists of two chemically distinct structural domains: an O-layer terminated domain and a hydroxylated Fe-layer terminated domain. After exposing the α-Fe2O3(0 0 0 1) surface to aqueous Fe(II), the surface structure of both co-existing structural domains was modified due to adsorption of Fe at crystallographic lattice sites of the substrate, resulting in six-coordinated adsorbed Fe at the surface. The average Fe-O bond lengths of the adsorbed Fe are consistent with typical Fe(III)-O bond lengths (in octahedral coordination), providing evidence for the oxidation of Fe(II) to Fe(III) upon adsorption. These results highlight the important role of substrate surface structure in controlling Fe(II) adsorption. Furthermore, the molecular scale structural characterization of adsorbed Fe provides insight into the process of Fe(II) induced structural modification of hematite surfaces, which in turn aids in assessing the effective reactivity of hematite surfaces in Fe(II) rich environments. 相似文献
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Sebastien Kerisit Chongxuan Liu Eugene S. Ilton 《Geochimica et cosmochimica acta》2008,72(6):1481-1497
Molecular dynamics simulations of water in contact with the (0 0 1) and (0 1 0) surfaces of orthoclase (KAlSi3O8) were carried out to investigate the structure and dynamics of the feldspar-water interface, contrast the intrinsic structural properties of the two surfaces, and provide a basis for future work on the diffusion of ions and molecules in microscopic mineral fractures. Electron density profiles were computed from the molecular dynamics trajectories and compared with those derived experimentally from high-resolution X-ray reflectivity measurements by Fenter and co-workers [Fenter P., Cheng L., Park C., Zhang H. and Sturchio N. C. (2003a) Structure of the orthoclase (0 0 1)- and (0 1 0)-water interfaces by high-resolution X-ray reflectivity. Geochim. Cosmochim. Acta67, 4267-4275]. For each surface, three scenarios were considered whereby the interfacial species is potassium, water, or a hydronium ion. Excellent agreement was obtained for the (0 0 1) surface when potassium is the predominant interfacial species; however, some discrepancies in the position of the interfacial peaks were obtained for the (0 1 0) surface. The two surfaces showed similarities in the extent of water ordering at the interface, the activation energies for water and potassium desorption, and the adsorption localization of interfacial species. However, there are also important differences between the two surfaces in the coordination of a given adsorbed species, adsorption site densities, and the propensity for water molecules in surface cavities and those in the first hydration layer to coordinate to surface bridging oxygen atoms. These differences may have implications for the extent of dissolution in the low-pH regime since hydrolysis of Si(Al)OSi(Al) bonds is a major dissolution mechanism. 相似文献
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论述了建立“地质资料光盘存储综合管理系统”即改变地质资料保存介质和利用手段的现实意义。阐述了“地质资料光盘存储综合管理系统”。提出了在本省建立该系统的建议。 相似文献
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本文系统介绍了陕西省水工环地质信息网络系统的建设方案,提出了信息网络系统中所包含的各种数据库,介绍了省局级信息网络系统构成的基本框架,这对于地矿部门建立省级水工环地质网络系统,具有很好的参考价值及指导意义。 相似文献
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本文对小秦岭（陕西境内）高山河群与小河岩体的接触关系性质,从点到面,从微观到宏观进行了扼要的论述,并明确指出二者非侵入接触,而应是沉积不整合接触,在此基础上探讨了小河岩体的时代。 相似文献
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根据轮台断裂的构造特征,提出了应用地球物理方法研究轮台断裂封堵性的技术思路和方法。在地震资料精细保幅处理的基础上,对地震资料进行速度反演,利用地震资料和测井资料计算出断层上、下盘附近地层的泥质含量、泥质涂抹量、孔隙度、地层压力等。通过研究并置接触关系、孔隙连通性、压力差异等判别断裂封堵能力,结合地震资料特殊处理并预测雅南１号构造的含油气性。 相似文献
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江西相山地区中,新生低构造演化对富大铀矿形成的制约 总被引：1，自引：1，他引：0
江西相山铀矿田是我国目前最大的火山岩型铀矿田,一直是铀矿地质学界的研究热点之一。大量的新资料支持以下的构造演化模型：成矿前的走滑剪切;成矿期的伸展拉张;成矿后的挤压逆冲。这一构造演化体系是形成相山富大铀矿田的有利地质构造背景。 相似文献
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Adsorption of Rb+ and Sr2+ at the orthoclase (0 0 1)-solution interface is probed with high-resolution X-ray reflectivity and resonant anomalous X-ray reflectivity. Specular X-ray reflectivity data for orthoclase in contact with 0.01 m RbCl solution at pH 5.5 reveal a systematic increase in electron density adjacent to the mineral surface with respect to that observed in contact with de-ionized water (DIW). Quantitative analysis indicates that Rb+ adsorbs at a height of 0.83 ± 0.03 Å with respect to the bulk K+ site with a nominal coverage of 0.72 ± 0.10 ions per surface unit mesh (55.7 Å2). These results are consistent with an ion-exchange reaction in which Rb+ occupies an inner-sphere adsorption (IS) site. In contrast, X-ray reflectivity data for orthoclase in contact with 0.01 m Sr(NO3)2 solution at pH 5.3 reveal few significant changes with respect to DIW. Resonant anomalous X-ray reflectivity was used to probe Sr2+ adsorption and to image its vertical distribution. This element-specific measurement reveals that Sr2+ adsorbs with a total coverage of 0.37 ± 0.02 ions per surface unit mesh, at a substantially larger height (3.28 ± 0.05 Å) than found for Rb+, and with a relatively broad density distribution (having a root-mean-square width of 1.88 ± 0.08 Å for a single-peak model), implying that Sr2+ adsorbs primarily as a fully-hydrated outer-sphere (OS), species. Comparison to a two-height model suggests that 13 ± 5% of the adsorbed Sr2+ may be present as an IS species. This partitioning implies a ∼5 kJ/mol difference in free energy between the IS and OS Sr2+ on orthoclase. Differences in the partitioning of Sr2+ between IS and OS species for orthoclase (0 0 1) and muscovite (0 0 1) suggest control by the geometry of the IS adsorption site. Results for the OS distribution are compared to predictions of the Poisson-Boltzmann equation in the strong coupling regime, which predicts an intrinsically narrow vertical diffuse ion distribution; the OS distribution might thus be thought of as the diffuse ion profile in the limit of high surface charge. 相似文献
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Jarosite is an important mineral on Earth, and possibly on Mars, where it controls the mobility of iron, sulfate and potentially toxic metals. Atomistic simulations have been used to study the incorporation of Al3+, and the M2+ impurities Cd, Cu and Zn, in the (0 1 2) and (0 0 1) surfaces of jarosite. The calculations show that the incorporation of Al on an Fe site is favorable on all surfaces in which terminal Fe ions are exposed, and especially on the (0 0 1) [Fe3(OH)3]6+ surface. Incorporation of Cd, Cu or Zn on a K site balanced by a K vacancy is predicted to stabilize the surfaces, but calculated endothermic solution energies and the high degree of distortion of the surfaces following incorporation suggest that these substitutions will be limited. The calculations also suggest that incorporation of Cd, Cu and Zn on an Fe site balanced by an OH vacancy, or by coupled substitution on both K and Fe sites, is unfavorable, although this might be compensated for by growth of a new layer of jarosite or goethite, as predicted for bulk jarosite. The results of the simulations show that surface structure will exert an influence on uptake of impurities in the order Cu > Cd > Zn, with the most favorable surfaces for incorporation being (0 1 2) [KFe(OH)4]0 and (0 0 1) [Fe3(OH)3]6+. 相似文献
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Jeffrey G. Catalano 《Geochimica et cosmochimica acta》2011,75(8):2062-2061
Ordering of interfacial water at the hematite and corundum (0 0 1)-water interfaces has been characterized using in situ high resolution specular X-ray reflectivity measurements. The hematite (0 0 1) surface was prepared through an annealing process to produce a surface isostructural with corundum (0 0 1), facilitating direct comparison. Interfacial water was found to display a similar structure on this pair of isostructural surfaces. A single layer of adsorbed water having a large vibrational amplitude was present on each surface and additional ordering of water extended at least 1 nm into the bulk fluid, with the degree of ordering decreasing with increasing distance from the surfaces. Consistent with prior studies of the (0 1 2) and (1 1 0) surfaces of hematite and corundum, the configuration of water above the (0 0 1) surfaces is primarily controlled by the surface structure, specifically the arrangement of surface functional groups. However, interfacial water at the (0 0 1) surfaces displayed significantly larger vibrational amplitudes throughout the interfacial region than at other isostructural sets of hematite and corundum surfaces, indicating weaker ordering. Comparison of the vibrational amplitudes of adsorbed water on a series of oxide, silicate, and phosphate mineral surfaces suggests that the presence or absence of a substantial interfacial electrostatic field is the primary control on water ordering and not the surface structure itself. On surfaces for which charge originates dominantly through protonation-deprotonation reactions the controlling factor appears to be whether conditions exist where most functional groups are uncharged as opposed to the net surface charge. The doubly coordinated functional groups on hematite and corundum (0 0 1) surfaces are largely uncharged under slightly acidic to circumneutral pH conditions, leading to weak ordering, whereas singly coordinated groups on (0 1 2) and (1 1 0) surfaces of these phases are always charged, even when the net surface charge is zero, and induce strong water ordering. Surfaces lacking structural charge can thus be divided into two distinct classes that induce either strong or weak ordering of interfacial water. Surface functional group coordination is the ultimate control on this division as it determines the charge state of such groups under different protonation configurations. Ion adsorption and electron transfer processes may differ between these classes of surfaces because of the effect of water ordering strength on interfacial capacitances and hydrogen bonding. 相似文献