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1.
通过龙门山区和川西前陆盆地岩石样品的裂变径迹和镜质体反射率的测定和计算机模拟得出：１）松潘－甘孜褶皱带１０Ｍａ以来至少隆升了３－４ｋｍ，隆升速率最低为０．３－０．４ｍｍ／ａ；（２）龙门山逆冲推覆构造带１０Ｍａ以来至少隆升了５－６ｋｍ，隆升速率最低为０．０１６－０．０３２ｍｍ／ａ；（４）川西前陆盆地６０Ｍａ以来降升１－２ｋｍ，降升速率为０．０２８－０．０５ｍｍ／ａ；（５）１０Ｍａ以来北川－映秀－小关 相似文献
2.
从Fe：Mg：Si：O＝1：1：1：4的早期太阳星云中原子的两体碰撞频率开始，对均匀稳恒状态下某一特定团簇的碰撞几率和有效碰撞数的表达式进行了讨论，并建立了一个稳恒状态下的统计热力学定态模型。然后利用这一模型和模拟实验的结果计算了太阳星云中几种主要原子团簇相对内能的大小以及不同平衡态下的分布。 相似文献
3.
GIS支持的Eigenface法——适于只有一个模型单元时的矿产定量预测方法 总被引：3，自引：2，他引：3
在研究和开发程度较低地区开展矿产预测，往往只能有很少矿产地用以建立定量预测模型，此时大多数统计分析方法不适用。一种GIS的基于“单元簇”概念的多源地学信息综合分析方法即Eigenface法，比较适合于只有一个模型单元时的建模。单元簇是相邻若干网格单元的空间定量组合Eigenface法先求出这种高维组合变量空间的某个低维特征子空间，然后计算未知单元簇和已知单元簇在特征子空间上投影点的距离来评价未知单元的的找矿有利性。Eigenface法与GIS集成是将单元作为区图元，利用GIS空间－属性分析功能提取预测信息并对单元和单元簇进行操作。以新疆乌斯拉台－亦格尔达坂地区铜铅锌银多金属矿产预测为例说明了其应用效果。 相似文献
4.
预富集柱—离子色谱法测定高纯水中痕量氟和氯 总被引：3，自引：0，他引：3
在国产离子色谱仪上加装填充有季铵型阴离子交换剂的预富集柱，所设计的流路和方法可将测定Ｆ－和Ｃｌ－的检出限分别降至０１７μｇ／Ｌ和０２７μｇ／Ｌ。测定精密度好，ＲＳＤ＜５％，方法满足反应堆堆芯冷却水中痕量Ｆ－和Ｃｌ－的检测要求。 相似文献
5.
通过对鄂尔多斯盆地腹部城川１井（０－４５００ｍ）酸解烃、热解烃及部分层段抽提烃的系统研究，结合剖面上有机质含量的变化及产油气层的分布，讨论了油气垂向微渗漏在浅层沉积层中留下的可识别的地球化学痕迹。该井浅层０－１０２０ｍ井段，有机碳含量低，在０．０６％－０．３％之间，平均为０．１１％，ｔｍａｘ值小于４００℃，有机质处于未成熟热演化阶段，岩性发育以红色、砖红色粉砂岩和浅灰色砂质泥岩和粉砂岩为主，这样一 相似文献
6.
冀东高级变质作用中流体演化 总被引：8，自引：2，他引：8
冀东太古宙麻粒岩相变质岩石的结构、矿物组合和反应关系反映了其变质作用经历了峰前、峰期、峰后和退化变质四个阶段。通过平衡热学计算和流体包裹体研究获得了各变质阶段Ｐ－Ｔ条件和流体性质。峰前阶段的变质条件为６５０－７３５℃，０．５－０．７ＧＰａ，平衡变质流体中水的摩尔分数是０．４９－０．９５。峰期阶段为８１２－８６０℃，０．８－１．２ＧＰ，ＸＨ２ｏ从０．４９－０．９５下降到０．３２－０．４９，捕获的流体 相似文献
7.
在０．１３ｍｏ１／ＬＮ＿２ＳＯ＿４及８％丙酮介质中，ｐ（Ⅴ）－Ｓｂ（Ⅲ）－Ｗ（Ⅵ）三元杂多酸在示波极谱仪上产生一良好的吸附还原波。峰电位为一０．５２Ｖ（υｓ．ＳＣＥ），峰电流（导数波高）与Ｐ浓度在８．０×１０￣（－７）～２．０×１０￣（－５）ｍｏｌ／Ｌ范围内呈线性关系，检测下限为２．０×１０￣（－７）ｍｏｌ／Ｌ。对极谱波的性质进行了探讨，用该法测定了钢标样中的微量Ｐ，结果与推荐值相符。 相似文献
8.
加拿大阿尔伯达省西部上泥盆统凯恩组白云岩的成因 总被引：1，自引：0，他引：1
加拿大阿尔伯达省西部上泥盆统凯恩组主要由粉晶白云岩和细晶白云岩组成，另外还常见一种充填溶蚀孔洞的亮晶白云石。粉晶白云岩纹理、泥裂和鸟眼等构造发育，其δ＾１３Ｃ为＋１．０‰－＋３．０‰，δ＾１８Ｏ为－６．０‰－－４．３‰，为潮坪上混合水白云化形成。细晶白云岩分布于假整合面之下，其δ＾１３Ｃ为＋０．２‰－＋２．９‰，δ＾１８Ｏ为－６．９‰－－４．６‰，也是混合水白云化的产物。亮晶白云石洁净明亮、晶粒粗 相似文献
9.
10.
本文研究用２－（５－溴－吡啶偶氮）－５－二乙氨基酚（５－Ｂｒ－ＰＡＤＡＰ）作显色剂双波长分光光度法同时测定微量铜和钴的反应条件。在ｐＨ５．０－６．０酸度范围内选择测定铜的波长对为５４５／１５６８ｎｍ；测定钻的波长对为５８５／４９５ｎｍ。于５０ｍｌ溶液中，铜、钴含量分别在０－０．５６ｕｇ／ｍｌ和０－０。４８ｕｇ／ｍｌ内符合比尔定律。方法用于岩石矿物样品的测定效果良好。 相似文献
11.
湖北地质学院X光实验室 《地质科学》1974,9(2):117-132
索伦石是1961年在我国发现的一种新矿物。成分为CaO·SiO2·H2O,是人工和天然的含水硅酸钙矿物中CaO∶SiO2∶H2O=1:1:1的唯一一种矿物,因此索伦石结构的测定对了解这一类矿物的晶体化学当有助益。 相似文献
12.
莫来铁尖晶岩的发现和玄武岩浆的深部分异作用 总被引：3，自引：0，他引：3
莫来铁尖晶岩是首次发现的一种新型火山岩,由铁尖晶石、莫来石、铁板钛矿和火山玻璃组成,其平均化学成分相当于一个简化的SiO_2-FeO~*—Al_2O_3三元系。莫来铁尖晶岩浆是原始岩浆深部分异的结果。原始玄武岩浆在地幔深处分离结晶出富含硬玉分子的斜方辉石、单斜辉石,进化岩浆向富Al、Fe而贫Si的方向演化,最终产生莫来铁尖晶岩浆。后者喷出地表,冷凝结晶形成莫来铁尖晶岩。 相似文献
13.
星叶石是碱性岩中分布较广泛的副矿物,成分富含碱金属K、Na及Ti,随其产出的地球化学条件,类质同象代换情况较复杂,形成许多成分异种。本工作之前对其组成和性质都不十分清楚,前人虽进行了一般矿物学研究,但未能确定所属晶系,B.C.索波列夫曾推断星叶石中Ti呈四面体配位,并与硅氧四面体组成复杂构造。 相似文献
14.
Experimental tests of garnet peridotite oxygen barometry 总被引：1，自引：0，他引：1
We have performed experiments aimed at testing the calibration of oxygen barometers for the garnet peridotite [garnet (Gt)-olivine (Ol)-orthopyroxene (Opx)] phase assemblage. These involved equilibrating a thin layer of garnet sandwiched between layers of olivine and orthopyroxene at 1300°C and 23–35 kbar for 1–7 days. Oxygen fugacity was controlled (but not buffered) by using inner capsules of Fe?Pt alloy or graphitc or molybdenum sealed in welded Pt outer capsules. Post-experiment measurement of fO2 was made by determining the compositions of Pt-Fe alloy sensors at the interface between garnet and olivine + orthopyroxene layers. The composition of alloy in equilibrium with olivine + orthopyroxene was approached from Fe-oversaturated and Fe-undersaturated conditions in the same experiment with, in general, excellent convergence. Product phase compositions were determined by electron microprobe and a piece of the garnet layer saved for 57Fe Mössbauer spectroscopy. The latter gave the Fe3+ content of the garnet at the measured P-T-fO2 conditions. Approach to equilibrium was checked by observed shifts in Fe3+ content and by the approach of garnet-olivine Fe?Mg partitioning to the expected value. The compositions of the phases were combined with mixing properties and thermodynamic data to calculate an apparent fO2 from two possible garnet oxybarometers:- (1) $\begin{gathered} 2Ca_3 Fe_2 Si_3 O_{12} + 2Mg_3 Al_2 Si_3 O_{12} + 4FeSiO_3 = 2Ca_3 Al_2 Si_3 O_{12} \hfill \\ Gt Gt Opx Gt \hfill \\ + 8FeSi_{0.5} O_2 + 6MgSiO_3 + O \hfill \\ Ol Opx \hfill \\ \end{gathered} $ and (2) $\begin{gathered} 2Fe_3 Fe_2 Si_3 O_{12} = 8FeSi_{0.5} O_2 + 2FeSi_3 O_2 \hfill \\ Gt Ol Opx \hfill \\ \end{gathered} $ Comparison of calculated fO2s with those measured by the Pt-Fe sensors demonstrated that either barometer gives the correct answer within the expected uncertainty. Data from the first (Luth et al. 1990) has an uncertainty of about 1.6 logfO2 units, however, while that from equilibrium (2) (Woodland and O'Neill 1993) has an error of +/- 0.6 log units, comparable to that of the spinel peridotite oxybarometer. We therefore conclude that equilibrium (2) may be used to calculate the fO2 recorded by garnet peridotites with an uncertainty of about +/- 0.6 log units, providing the potential to probe the oxidation environment of the deep continental lithosphere. Preliminary application based on data from Luth et al. (1990) indicates that garnet peridotite xenoliths from Southern Africa record oxygen fugacities about 3.0 log units below the FMQ (fayalite-magnetite-quartz) buffer. These are substantially more reducing conditions than those recorded by continental spinel lherzolites which typically give oxygen fugacities close to FMQ (Wood et al. 1990). 相似文献
15.
“海州式”磷矿床中磷灰石的矿物学研究 总被引：1，自引：0，他引：1
“海州式”磷矿床中的磷灰石主要由变质改造再活化、混合岩化交代重结晶而成，有微碳氟磷灰石、氟磷灰石两种，晶胞参数σ０＝９．３６５３－９．３８１９ｎｍ，Ｃ０＝６．８７９７－６．８９３６ｎｍ，晶体化学式为（Ｃａ５．００Ｆ３０．０２Ｓｒ０．０１ＴＲ０．０１）５．０４〔（Ｐ２．９９Ｃ０．０４）３．０３Ｏ１２〕Ｆ０．８０，（Ｃａ４．９４Ｆｅ０．０２Ｍｇ０．０２Ｓｒ０．０１ＴＲ０．０１）５．００〔（Ｐ２．９０〕 相似文献
16.
与遂安石共生的电气石矿物学特征及其地质意义 总被引：1，自引：1，他引：0
在对宽甸砖庙硼矿床的研究中发现了电气石与遂安石共生的现象,电气石为钙镁电气石,由电子探针分析结果计算的晶体化学式为:(Ca0.59Na0.355K0.06)(Mg2.557Fe0.1512+Ti0.013Cr0.002Ni0.006)(Al5.416Fe0.5642-（BO3）3Si 6.16 O16（OH）4,同围岩中的电气石相比:（1）淡绿色,多色性弱;（2）折射率为Ne=1.646,Ns=1.624;（3）成分上富Mg（MgO 11.47％）和Ca（CaO3.14％）;相对贫Na（Na2O 1.09％）,Fe（FeO4.63％）和Al（Al2O326.69％）（4）结构上d101=3.393A,a0=15.957±0.002,c0=7.227±0.001;（5）红外光谱晶格Si-O4四面体振动I1001>I1036。这些标型特征具有硼矿床的找矿指示意义。 相似文献
17.
Silicon K-edge x-ray absorption near-edge structure (XANES) spectra of a selection of silicate and aluminosilicate minerals have been measured using synchrotron radiation (SR). The spectra are qualitatively interpreted based on MO calculation of the tetrahedral SiO 4 4? cluster. The Si K-edge generally shifts to higher energy with increased polymerization of silicates by about 1.3 eV, but with considerable overlap for silicates of different polymerization types. The substitution of Al for Si shifts the Si K-edge to lower energy. The chemical shift of Si K-edge is also sensitive to cations in more distant atom shells; for example, the Si K-edge shifts to lower energy with the substitution of Al for Mg in octahedral sites. The shifts of the Si K-edge show weak correlation with average Si-O bond distance (dSi-O), Si-O bond valence (sSi-O) and distortion of SiO4 tetrahedra, due to the crystal structure complexity of silicate minerals and multiple factors effecting the x-ray absorption processes. 相似文献
18.
莫来铁尖晶岩中的莫来石是首次发现的一种火山岩型莫来石。在全岩X射线粉晶衍射图上莫来石的d值(nm)为:0.5378(5),0.3428(9),0.3385(10),0.2693 (4),0.2545(5),0.2295 (2),0.1601 (2),0.1542 (4),0.1443 (2)。电子探针分析结果,莫来石的成分(%)为:SiO_2 28.96,TiO_2 0.53,Al_2O_3 67.13,FeO 3.06,MnO 0.05.MgO 0.02,Na_2O 0.21,K_2O 0.02,Cr_2O_3 0.05, NiO 0.02。这种莫来石是从玄武岩浆演化后期产生的富Al_2O_3、FeO(Fe_2O_3)和贫SiO_2的莫来铁尖晶岩浆中直接结晶而成的。 相似文献
19.
The enthalpy of formation of andradite (Ca3Fe2Si3O12) has been estimated as-5,769.700 (±5) kJ/mol from a consideration of the calorimetric data on entropy (316.4 J/mol K) and of the experimental phaseequilibrium data on the reactions: 1 $$\begin{gathered} 9/2 CaFeSi_2 O_6 + O_2 = 3/2 Ca_3 Fe_2 Si_3 O_{12} + 1/2 Fe_3 O_4 + 9/2 SiO_2 (a) \hfill \\ Hedenbergite andradite magnetite quartz \hfill \\ \end{gathered} $$ 1 $$\begin{gathered} 4 CaFeSi_2 O_6 + 2 CaSiO_3 + O_2 = 2 Ca_3 Fe_2 Si_3 O_{12} + 4 SiO_2 (b) \hfill \\ Hedenbergite wollastonite andradite quartz \hfill \\ \end{gathered} $$ 1 $$\begin{gathered} 18 CaSiO_3 + 4 Fe_3 O_4 + O_2 = 6Ca_3 Fe_2 Si_3 O_{12} (c) \hfill \\ Wollastonite magnetite andradite \hfill \\ \end{gathered} $$ 1 $$\begin{gathered} Ca_3 Fe_2 Si_3 O_{12} = 3 CaSiO_3 + Fe_2 O_3 . (d) \hfill \\ Andradite pseudowollastonite hematite \hfill \\ \end{gathered} $$ and $$log f_{O_2 } = E + A + B/T + D(P - 1)/T + C log f_{O_2 } .$$ Oxygen-barometric scales are presented as follows: $$\begin{gathered} E = 12.51; D = 0.078; \hfill \\ A = 3 log X_{Ad} - 4.5 log X_{Hd} ; C = 0; \hfill \\ B = - 27,576 - 1,007(1 - X_{Ad} )^2 - 1,476(1 - X_{Hd} )^2 . \hfill \\ \end{gathered} $$ For the assemblage andradite (Ad)-hedenbergite (Hd)-magnetite-quartz: $$\begin{gathered} E = 13.98; D = 0.0081; \hfill \\ A = 4 log(X_{Ad} / X_{Hd} ); C = 0; \hfill \\ B = - 29,161 - 1,342.8(1 - X_{Ad} )^2 - 1,312(1 - X_{Hd} )^2 . \hfill \\ \end{gathered} $$ For the assemblage andradite-hedenbergite-wollastonite-quartz: 1 $$\begin{gathered} E = 13.98;{\text{ }}D = 0.0081; \hfill \\ A = 4\log (X_{Ad} /X_{Hd} );{\text{ C = 0;}} \hfill \\ B = - 29,161 - 1,342.8(1 - X_{Ad} )^2 - 1,312(1 - X_{Hd} )^2 . \hfill \\ \end{gathered} $$ For the assemblage andradite-hedenbergite-calcitequartz: 1 $$\begin{gathered} E = - 1.69;{\text{ }}D = - 0.199; \hfill \\ A = 4\log (X_{Ad} /X_{Hd} );{\text{ C = 2;}} \hfill \\ B = - 20,441 - 1,342.8(1 - X_{Ad} )^2 - 1,312(1 - X_{Hd} )^2 . \hfill \\ \end{gathered} $$ For the assemblage andradite-hedenbergite-wollastonite-calcite: 1 $$\begin{gathered} E = - 17.36;{\text{ }}D = - 0.403; \hfill \\ A = 4\log (X_{Ad} /X_{Hd} );{\text{ C = 4;}} \hfill \\ B = - 11,720 - 1,342.8(1 - X_{Ad} )^2 - 1,312(1 - X_{Hd} )^2 \hfill \\ \end{gathered} $$ The oxygen fugacity of formation of those skarns where andradite and hedenbergite assemblage is typical can be calculated by using the above equations. The oxygen fugacity of formation of this kind of skarn ranges between carbon dioxide/graphite and hematite/magnetite buffers. It increases from the inside zones to the outside zones, and appears to decrease with the ore-types in the order Cu, Pb?Zn, Fe, Mo, W(Sn) ore deposits. 相似文献
20.
采用最新的量子化学半经验计算方法MNDO－PM3，对作为粘土矿物结构基元的六元环分子体系进行了结构与能量的计算，揭示了结构变形的精确程度，并利用能量的差异大小，讨论了几种同分异构体的稳定性。 相似文献