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《Scientia Geologica Sinica》1998,(1)
ASTUDYOFMODELSOFMICROSTRATIGRAPHYOFCOALSEAMSZhangYousheng,QinYong,ChenJialiangandZengYongColegeofMineralResourcesandEnvironm... 相似文献
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钇硅磷灰石为乳白、玫瑰色,实测比重为4.35,二轴晶正光性,α=1.791;γ=1.784;电子探针分析计算晶体化学式为(Y_(2.82)Ca_(1.58)Ce_(0.27)Dy_(0.21)Er_(0.11…)_5[(Si_(2.95)P_(0.05))_3O_(12)](OH,F),空间群为C_2~2-P2_1,晶胞参数为a=0.9504±0.0005nm,b=0.9414±0.0004nm, c=0.6922±0.0002nm,r=119.71±0.04°,V=53.79±0.04nm~3,Z=2,结构参数经各向异性温度因子最小二乘法修正后R=0.111。结构分析表明:由磷灰石型的P6_3/m降低至钇硅磷灰石的P2_1,Y~(3+)替代Ca~(2+)成有序分布,导致结构中7角和9角多面体的畸变,同时Si~(4+)替代P~(5+),OH-替代F~-,加大了这种畸变,使得Y、Ca、Si、O及OH~-都偏离了赝六方P6_3/m的6h、4f、12i及2a等效点系位置,但钇硅磷灰石仍近似磷灰石型结构,最后对磷灰石型结构矿物的晶体化学进行了讨论。 相似文献
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花岗质岩石成因分类研究述评 总被引:5,自引:0,他引:5
由于花岗质岩石类型多 ,分布广 ,差异大 ,因此 ,国内外学者依据不同的判别标准提出了多种花岗质岩石的分类方案。通过对 2 0多种有代表性的分类方案的分析和对比 ,笔者认为 ,Barbarin(1999)提出的花岗岩类成因分类方案较为合理 ,但应补充橄榄玄粗质花岗岩类这一重要类型。文中较详细地介绍了Barbarin (1999)的分类方案 ,论述了含白云母的过铝质花岗岩类 (MPG)、含堇青石的过铝质花岗岩类 (CPG)、富钾的钙碱性斑状钾长石花岗岩类 (KCG)、富角闪石钙碱性花岗岩类(ACG)、岛弧拉斑系列花岗岩类 (ATG)、洋中脊拉斑质花岗岩类 (RTG)、过碱性和碱性花岗岩类(PAG)以及橄榄玄粗质花岗岩类 (SHG)的特征及其形成的地球动力学环境 ,并简要讨论了这种分类方法的优点和意义。 相似文献
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深埋隧洞地温场的数值模拟研究 总被引:1,自引:0,他引:1
本文结合某水电站勘探平硐的地质及地温实测资料,在考虑地形,岩性,构造及地下水活动等因素的基础上,用有限元反演的方法,对山体的地温场进行了数值模拟,并对进一步掘进隧洞的地温场变化作了预测。 相似文献
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叶蜡石的热物理特性研究 总被引:4,自引:0,他引:4
叶蜡石是一种层状硅酸盐矿物,它的热物理特性主要取决于化学成分和共生矿物组合。较纯的叶蜡石热膨胀系数较小,而含石英较多的叶蜡石膨胀系数明显增大。叶蜡石相对热辐射率较低。它的共生矿物的差异影响结构破坏的温度,在加热到1000℃后的X射线粉晶衍射图上,出现了较弱的莫耒石和方英石的特征谱线,1200℃后特征谱线较明显。 相似文献
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《International Geology Review》2012,54(2):125-128
The concentrations of aqueous solution from which quartz, feldspar, topaz, tourmaline and other minerals crystallize during the hydrothermal stage, is important to an understanding of pegmatite formation. Two opposing theories have been advanced on solution concentration: 1) Pegmatitic minerals separate from highly concentrated solution, without marked change in concentration, by gradual cooling. 2) Pegmatitic minerals separate as a result of flow and of renovation of the exhausted contents of solutions; this need is based on low solubility of silica in pure water. Study of liquid inclusions in minerals reveals that separation of hydrothermal minerals is known to occur from aqueous solutions heavily saturated with alkaline-halide salts, carbonates, borates, and free carbonic acid. From observations made on secondary liquid inclusions in topaz samples from pegmatites, it was found that one-third of the inclusion-cavity volume was occupied by the gas bubble and the remainder of the volume, largely, by small crystals of several solid phases. Inclusion contents could not be completely homogenized, because they exploded at 400° - 450° C; homogenization required temperatures above 500° C. Flattened inclusions, formed by healing of cracks parallel to the (001) cleavage plane, were examined. At room temperature, the included bubble was disk like; on heating to temperatures of 180° - 200° C, the bubble contracted revealing beneath it a circular crescent-shaped depression, probably an indication that crystal substance had been deposited on inclusion-cavity walls. Accordingly, crystal substance precipitated out after entrapment of solution in the cavity because redeposition occurred around the bubble; this could have been possible only after the solution had been completely enclosed and subsequently cooled. To determine the original amount of substance entrapped, measurements were made of inclusion-cavity volume, thickness of substance deposited within the cavity (found to be about 2 percent of inclusion-cavity height), and depth of crescent-shaped depression. From these data it was found that up to 2 percent volume of the topaz substance remained in dissolved state at relatively low temperatures. Deposition traces were found on walls of sufficiently flat inclusions where a large part of the wall surface was blocked by a flattened bubble; presence of these conditions was required in order to detect the deposited layer and measure its height. 相似文献
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B. D. EVAMY 《Sedimentology》1963,2(2):164-170
A staining technique is described which detects variations in ferrous iron content within calcite and dolomite, whilst simultaneously differentiating the dolomite from the calcite. The application of this technique to a study of dedolomitisation is pre- sented.
Ferroan dolomite, in certain pyrite bearing limestones of the southern Jura, is shown to have been dedolomitised, that is replaced by calcite, while at the same time the pyrite content of the rock was oxidised to haematite. One of the oxidation products of the pyrite is considered to have caused the dedolomitisation. 相似文献
Ferroan dolomite, in certain pyrite bearing limestones of the southern Jura, is shown to have been dedolomitised, that is replaced by calcite, while at the same time the pyrite content of the rock was oxidised to haematite. One of the oxidation products of the pyrite is considered to have caused the dedolomitisation. 相似文献
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本文分析了三组结构面产状模型力学实验结果, 揭示了这种组合条件岩体中产生压剪区、张剪区及结构面、结构体的多种变形成分, 也揭示了压剪区和张剪区形成机理、及三组结构面组合下结构面产状的力学效应。 相似文献
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黑龙江省农业地球化学初步研究 总被引:4,自引:1,他引:4
本文采用对比分析等数据处理方法将黑龙江省1:50万区域地球化学资料应用于农业问题的研究。通过将该省主要农作物产量与土壤、水系沉积物中地球化学元素分布进行对比,发现农作物产量与微量元素含量之间存在一定关联,其中Co对大豆,Zn对甜菜、小麦、水稻等农作物产量具有明显的影响,由此初步提出了黑龙江省农业地球化学种植区划。 相似文献
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生物标志物苯并藿烷系列的新发现及其地化意义 总被引:1,自引:0,他引:1
蕾烷系列化合物的各类参数,已在石油地球化学研究中普遍应用,可有效地判断有机质类型及其成熟度。芳构藿烷发现有四芳和三芳藿烷,近年来又发现了一类新的单芳六环藿烷-苯并藿烷C32-C35系列,它们分别检出于碳酸盐岩和原油(G.Hussler,1984)、磷酸盐和非磷酸盐沉积物(H.Belayouni,1984)、新疆准噶尔盆地侏罗系含煤地层埋深617.7-619.7米的黑色泥岩(盛国英、傅家谟,1985)、陕甘宁盆地侏罗系、上三叠统与石炭二叠系的碳质页岩和油页岩(黄汝昌、王广玉,未发表)中。笔者在酒西盆地下白垩统黑色泥岩中检出了C32、C33、C35等苯并藿烷,更有意义的是,还首次鉴定出了C31苯并藿烷,即C29-降苯并藿烷,这进一步丰富了生物标志物的内容。 相似文献
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碎石桩复合地基的抗液化特性探讨 总被引:8,自引:2,他引:6
饱和砂土地震液化问题是岩土地震工程中一个重要的研究课题。在多种可行的防治液化措施中 ,最普遍的方法是采用碎石桩复合地基。本文结合目前国内外碎石桩复合地基的抗液化研究的最新进展 ,对碎石桩的密实、排水减压和减震作用做了较详细的评述 ,最后还提出碎石桩复合地基抗液化特性需要进一步研究的问题 相似文献
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《International Geology Review》2012,54(3):387-399
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用高分辨电子显微术和光学衍射技术研究了莱河矿的三种超结构类型——3C_1,2C,3C_2。超结构的存在是由于Fe~(2+)空位的不同有序分布产生的。通过观察象与模拟象的比较,建立了相应的结构模型。 相似文献