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本文主要应用透射光、反射白光和荧光相结合的综合光学法对珠江口盆地下第三系烃源岩的有机显微组份进行了煤岩学鉴定及荧光参数的测试，并采用了透射电子显微镜（ＴＥＭ）新技术对镜质组份中的超微组份进行研究。通过热解模拟剖析了不同显微组份组合烃源岩的生烃潜力。（１）发现了本区显微组份的独有特征，即镜质组本体中镶嵌有丰富的壳质和腐泥组份，并命名为壳镜组，同时结合无定形的细分，划分了壳镜组的亚组份。（２）在高倍透射电子显微镜下对镜质组中的超微类脂体进行了划分定量。（３）盆地烃源岩共划分了三种类型、七个显微组份组合，其中Ａ２，Ｂ１是主要给合，其次是Ｂ２，明确了壳镜组和超微类脂体是主要生烃母质。（４）研究了不同显微组份组合的生烃潜力，壳镜组具有单位有机碳生烃潜力高的特点，肯定了盆地的含油远景。 相似文献
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根据实测的压力和镜质组反射率数据讨论了沉积盆地中镜质组反射率异常的物理化学环境.认为异常压力并不是导致镜质组反射率受到抑制的唯一原因;沉积盆地中有机质镜质组反射率异常的原因除与有机质本身的性质有关外,还与其所处的温度、压力等物理环境及其周围的流体性质、无机元素(矿物)的组成等化学因素密切相关.通过对钻井异常高压带和正常压力带剖面密集取样进行的微量元素与镜质组反射率分析表明,偏酸性、低盐度的流体介质有利于有机质镜质组反射率的增加;通过分析泥岩中的某些元素丰度与镜质组反射率的对应关系,初步确定钙、锰、锶、硼、钡、磷等元素对镜质组反射率的演化有抑制作用,而铁、钴、锌、镍、铷等元素对有机质的热演化具有催化作用.本研究对于有机质成熟校正、油气资源评价和利用成熟度古温标恢复盆地热历史都具有意义. 相似文献
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镜质组异常低反射率机理分析是煤岩光度研究中的一个重要课题。通过对不同类型显微组份反射率谱特征的研究,发现富氢性对其特征有显著影响。正常镜质组反射率谱在400～700nm范围内无明显变化,长波位没有明显上扬或下降;惰性组在长波段呈下降趋势;壳质组长波段位明显上扬;富氢镜质组的长波斜率参数位于正常镜质组和壳质组之间,长波段位上扬。根据对反射率谱特征的数量化描述,提出了一个长波斜率参数,利用该参数可以来定量估计组份的富氢程度和反射率的抑制程度。 相似文献
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本文是《实用煤相学》研究的另一篇论文，对组成不同煤相（Ⅰ１、Ⅰ２、Ⅱ和Ⅲ）的煤的类型进行了深入分析，论述了不同环境（煤相）决定了不同的成煤类型的观点。通过对不同煤型煤的显微组分（类脂组、镜质组和无机组分）组成和镜质组特征（荧光强度和反射率）的深入研究，划分出与四种煤相相对应的四种基本的类型：即强还原型腐泥煤或腐殖腐泥煤（Ⅰ１型）、强还原型腐泥腐殖煤或腐殖煤（Ⅰ２型）、较强还原型腐殖煤（Ⅱ型）和较弱还原型腐殖煤（Ⅲ型）。从而阐述了煤相与煤型之间的内在成因联系。为进一步表述“沉煤环境（煤相）—成煤类型（煤型）—煤质特征（煤质）”这一概略成因模型奠定了基础。 相似文献
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压力对镜质组反射率与烃类生成的影响 总被引：2，自引：0，他引：2
镜质组反射率是广泛使用的成熟度参数，长期以来人们普遍认为温度和时间是控制镜质组反射率的主要因素，而压力对反射率的影响人们知之甚少。本文综述了模拟实验地质实例中压力对镜质组反射率和烃类生成影响的不同观点，介绍了过压造成镜质组反射率延尺的两个动力学模型。 相似文献
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在我国分布校广的下古生界碳酸盐岩地层大多数热演化程度较高,损失了很多荧光信息,给烃源岩的荧光观测与评价带来了很式困难。采用新组装的激光－荧光显微系统进行研究,获得了很多有意义的结果。烃源岩中显微有机组分的荧光观测范围由烃源岩成熟度的镜质组反射率Ｒ０小于１．３％扩大到等效镜质组反射率Ｒ０达１．８％左右;岩石中矿物荧光沥青的观测范围可达Ｒ０在２．４％以上,３．３％采用功率较高的激光－荧光显微系统,其观 相似文献
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应用煤岩学对强还原型腐殖煤系列样品(R_0=0.55％～1.01％)研究表明,它们含有较多的镜质组—类脂组过渡显微组分,这种组分的特征是:比基质镜质体反射率低,但荧光强度和生烃潜能较高。据显微特征可将其分为两种亚型——交织型和膨融型。它是荧光基质镜质体的另一种表现形式和强还原型腐殖煤生油的主要母质之一。 相似文献
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运用镜质组反射率、袍子体荧光参数、生物标志物参数详细研究了三塘湖盆地中生界烃源岩的有机质热演化特征及演化阶段。研究表明镜质组反射率是该区有机质热汪化最可靠听成熟度参数，孢子体荧光参数是重要的热演化指标，生物标志物参数是有效的热演化指标。三塘湖盆地有机质总体热演化水平较低，且在横向和纵向上存在明显的差异。该区的有机质热演化具有明显的阶段性，运用成熟度参数将其划分为未成熟和成熟两个阶段。 相似文献
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有机岩石学的分析测试手段经历了显微级、超显微级到目前的分子级阶段，分析测试手段的发展反应有机岩石学的发展。通过对测试手段的分析，笔者认为今后有机岩石学的发展趋势是岩石学与地球化学相结合，这对今后有机岩石学的研究具有一定的理论意义和实践意义。 相似文献
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The solid-solid reaction magnesiocarpholite = sudoite + quartz has been bracketed between 350 and 500°C, 6.3 and 7.8 kbar. Because it is impossible to synthesize end-member sudoite, all experiments were carried out using natural minerals as starting materials. Although mineral compositions were very close to those of the end-members, the effect of the fluorine content in carpholite was significant. Particularly in those experiments where sudoite grows at the expense of carpholite, electron microprobe analysis of the run products shows that a more stable F-rich carpholite crystallizes too, and consumes the fluorine released in solution by the breakdown of the original carpholite.
Our experimental results are combined, through a thermodynamic analysis, with a previous data set and with previous experimental data concerning the relative stability of chlorite, talc and magnesiocarpholite with excess of quartz and water as a function of P–T and AlAl(SiMg)-1 substitutions in phyllosilicates. This allows us to constrain the feasible thermodynamic parameters (H°f , sud; S ° sud) and (H°f,car ; S °car ) for the Mg end-members. Using the partition coefficients calculated from natural parageneses, we have computed a petrogenetic grid for the system FeO–MgO–Al2 O3 –SiO2 –H2 O. It demonstrates that parageneses involving sudoite and carpholite can be used as indicators of P–T conditions, up to 600° C, 8 kbar for sudoite, and at higher pressure for carpholite. 相似文献
Our experimental results are combined, through a thermodynamic analysis, with a previous data set and with previous experimental data concerning the relative stability of chlorite, talc and magnesiocarpholite with excess of quartz and water as a function of P–T and AlAl(SiMg)
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李桢熙 《吉林大学学报(地球科学版)》1987,(4)
本文通过不同的熔融温度下Na_2O或Na_2Si F_6影响硅酸盐熔浆粘度值的实验研究,分析了火山岩熔浆分异的机制,提出了富铁高钠质硅酸盐熔浆分异为富铁熔浆甚至硫铁矿“流”的可能性。这一论点合理地解释了云南大红山矿区Ⅱ富铁矿体的成因。 相似文献
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Marcos García-Arias 《Journal of Metamorphic Geology》2020,38(9):993-1010
The recent publication of new activity–composition models by Holland, Green and Powell (2018; Journal of Petrology 59 : 881–900), with a melt model calibrated for source compositions ranging from peridotitic to granitic, opens the door to the modelling of multiple petrogenetic processes at supersolidus conditions in which the composition of the melt phase changes considerably, without having to change the melt model. This melt model is also the first one using the internally consistent thermodynamic databases published by T. Holland and R. Powell that contains TiO2 and Fe2O3, further expanding the application of this model to more realistic geological scenarios. The accompanying mineral models are also the first in containing some minor elements, like TiO2 in garnet and K2O in clinopyroxene. Consequently, it is relevant to test the applicability of these new models to a large P–T–X range of conditions before they can be used in full. Thermodynamic calculations made with the software Perple_X using these models were compared to experimental results, namely the modal proportions and the composition of the melt and several mineral solution phases. The experiments chosen for the comparative study covered a wide range of source compositions (from mafic to felsic), pressure (from 0.3 to 2.1 GPa), temperature (from 700 to 1,150°C) and total and added water content (structural water: 0.15–1.48 wt%; added water: 0–8 wt%; total water: 0.15%–8.15%). The results indicate that the extended melt model reproduces well the composition of the experimental melts, with an inverse correlation between component amount and fit: the best match is found for SiO2 (−0.8% on average) and the worst match is found for those elements with the lowest amounts, TiO2 and MgO (+241% and +235% on average, respectively; values indicate calculated minus experimental, times 100 and divided by experimental). The TiO2 content in the melt model increases dramatically with increasing pressure, from +90% for P < 1.5 GPa to +593% for P > 1.5 GPa. No comparison was made on the Fe2O3 content, as the published iron contents of the experimental melts were always reported as FeOt. In some cases, there is a substantial mismatch in the modal proportions between experiments and calculations, with the reactant phases less abundant and product phases more abundant in the calculations, an effect that is attributed to kinetic effects in the experiments and to the selected clinoamphibole model. Finally, the extended melt model was compared to the tonalitic melt model of Green et al. (2016; Journal of Metamorphic Geology, 34 : 845–869). Both melt models produce very similar results for SiO2, Al2O3, Na2O and K2O, with slightly better results for the tonalitic melt model in FeOt and MgO and for the extended melt model in CaO. No comparison is made on TiO2 because the tonalitic melt model does not include this component. In summary, the new activity–composition models represent a significant contribution to thermodynamic calculations on the evolution of siliceous magmas where their composition, temperature and pressure changes substantially. 相似文献
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山东蒙阴苏家沟科马提岩岩石学特征 总被引：2，自引：0，他引：2
针对山东省镜内发现的科马提岩,阐述了其岩石学、矿物学、岩石化学、副矿物等特征,并与国内外资料对比,度为该岩石为一套典型的超镁铁质科马提岩。 相似文献
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Correlation coefficients of modal variables from several suites of granitic rocks have been calculated and tested for significance using the Chayes-Kruskal and Chayes methods. The results show that although Chayes' remaining-space transformation does, in general, weaken the original proportion correlations, the positive and low-negative original proportion correlations tend to increase in absolute value because of a tendency of positive increment of the covariance by such transformation. However, no satisfactory procedure for choosing the variable to be transformed (V2)could be determined, and testing of the significance of remaining-space correlations is found to be highly problematic. It is shown also that the Vistelius-Sarmanov procedure of calculation of correlation coefficients from closed-table data does not effectively eliminate the closure effect. It is concluded that assigning statistical significance to the correlation coefficients between modal variables is, in general, unsatisfactory, except where the number of variables 8,the sample size is large (say, 30),and there is no negative element in the variance vector of the corresponding open variables. 相似文献
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雪如岩体主要由中细粒二长花岗岩、中粗粒斑状二长花岗岩组成,在其与郎山组灰岩接触带附近发育有大量的矽卡岩型铜铁矿床或矿化点.岩石及锆石LA-ICP-MS U-Pb、XRF、ICP-AES等分析显示,雪如岩体富K2O、SiO2、LREE及Rb、Ba、Pb、Th等大离子亲石元素,而Nb、Ta、Sr、Ti等高场强元素含量相对较低,稀土元素配分曲线为明显的右倾曲线,具有中等的负Eu异常,属高钾钙碱性-钾玄岩岩石系列和后碰撞花岗岩类,成岩时代分别为79.25±0.97 Ma和79.72±0.51 Ma,形成于早白垩世末-晚白垩世初班公湖-怒江缝合带闭合后、羌塘地体与拉萨地体的后碰撞阶段.综合认为,雪如岩体岩浆源区为下地壳富含流体的石榴石角闪岩相-斜长角闪岩相的镁铁质岩石,是在后碰撞环境下经部分熔融形成的花岗岩类,对班戈地区铜铁多金属成矿非常有利;矽卡岩型铜铁成矿作用发生于80 Ma左右,该认识为区域找矿指明了方向. 相似文献
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山西大同钾镁煌斑岩地质地球化学特征 总被引：3，自引：0，他引：3
根据饮牛沟钾镁煌斑岩的岩石学、岩石化学、矿物化学、微量及稀土元素地球化学特征,本文认为该岩体属钾镁煌斑岩,但在矿物成分及化学成分上与世界上典型的含金刚石的钾镁煌斑岩相比,相对贫钛和钾,未出现含Ｋ,Ｂａ,Ｔｉ,Ｚｒ的副矿物。该岩体的成因可能为母岩部分熔融后又经分离结晶作用而形成的,岩浆起源于贫钛的金云母二辉橄榄岩,形成深度１００ｋｍ左右。 相似文献
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Andrew B. Vistelius 《Mathematical Geology》1972,4(2):89-102
Investigation of granitic rocks in the search for hidden ore deposits, restoration of their history, and understanding their special properties requires comparison of intrusive bodies. Comparisons are best made to some standard. The conception of an ideal magmatic granite as a standard is introduced in this paper. Investigation indicates that sequences of quartz grains potassium feldspars, and plagioclases of an ideal magmatic granite have definite mathematical properties. 相似文献