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861.
矿物表面活性及其量度 总被引:6,自引:1,他引:6
矿物及其材料的表面活性及其表面反应性的具体表征,它是由矿物表面功能基所控制。由于矿物表面金属原子的电负性不同,以及它所处的配位环境不同,常表现出不同的极性、荷电性和Lewis酸碱性,它与溶质和溶剂分子之间反应(成键)能力也不同。在热力学上表现为反应自由能变化也不同。因此,量度矿物表面活性就是量度其表面极性、荷电性和Lewis酸碱性,它既可用化学方法,也可用热力学的方法。前者是通过反应作用量来量度,后者通过反应作用能来量度。然而现代矿物谱学的方法更能给出矿物及其材料表面反应活性的本质和详细信息。 相似文献
862.
863.
864.
成矿作用的本质是成矿流体子系统在统一地质 成矿场中与其它子系统在远离平衡系统的动态过程中所能达到平衡的程度。成矿物质的来源和矿床的富集部位都受新全球动力学理论 -涡旋甩出说以及由它所决定的抽拉构造和多重岩片的控制。 相似文献
865.
Xiachen Zhi Zicheng Peng Daogong Chen Chunjiang Yu Weidong Sun Laurie Reisberg 《中国科学D辑(英文版)》2001,44(12):1110-1118
The basalt-borne peridotite xenoliths from Jiangsu-Anhui provinces were analyzed for whole rock Os isotopic compositions in
two laboratories of USTC, China and CRPG, France, respectively. The187Os/188Os ratio of the sample set ranges from 0.119 to 0.129 (25 samples, USTC) and from 0.117 to 0.131 (17 samples, CRPG). The Os
isotopic compositions of most samples are less than 0.129 and depleted relatively to the primitive mantle, showing a good
correlation with the major element compositions. With the187Os/188Os-Al2O3 alumichron, the samples yield a model age of 2.5 ± 0.1 Ga (data of USTC) and 1.9 ± 0.1 Ga (data of CRPG), late Archean to
early Pro-terozoic. The two samples with the lowest187Os/188Os ratio (0.119 and 0.117) have the TRD (Re depleted age) of 1.1 Ga (USTC) and 1.4 Ga (CRPG), mid-Proterozoic. The Os isotope model age shows that the peridotite
xenoliths from Cenozoic alkali basalt in Jiangsu-Anhui provinces have an old formation age (early- to mid- Proterozoic). They
are not newly produced mantle after the Phanerozoic replacement of the lithosphere mantle, but residual fractions of Proterozoic
mantle. 相似文献
866.
General characteristics of the recent horizontal crustal movement in Chinese mainland 总被引:5,自引:0,他引:5
1 Introduction of GPS observation dataThe Crustal Movement Observation Network of China (CMONOC) is a major scientific project in China organized by China Seismological Bureau and paticipated by the Bureau of Surveying and Mapping of the General Staff, the Chinese Academy of Sciences and the National Bureau of Surveying and Mapping. Based on the observation data of 25 fiducial stations and 56 basic stations in CMONOC (Figure 1 and Table 1), collected from August 26 to September… 相似文献
867.
ZHI Xiachen CHEN Peng LIN Chengzhong CHEN Shuqing ZHANG Guilan LI Yuzhi LIN Lei 《《地质学报》英文版》2001,75(1):51-58
The Mössbauer spectra of natural megacrystal clinopyroxene are usually fitted by 4 sets of symmetric doublets, A‐A', B‐B', C‐C' and D‐D', respectively, in terms of increasing Qs value in literature. But the assignments of those doublets are quite different, except the D‐D' doublet assigned to Fe3+at the lattice site M***1 in previous papers. Particularly, the assignment and interpretation of the C‐C' doublet are diverse. The oxidation experiments of natural megacrystal clinopyroxene collected from the Hannuoba basalt, North China, were performed under controlled conditions of temperature at 1000°C and oxygen fugacity of FMQ buffer in 1, 2, ***3 and 5 days respectively. The oxidized samples were then measured by X‐ray diffraction spectrometry and Mössbauer spectrometry. The oxidation of clinopyroxene is characterized by Fe2+ → Fe3+at M1 under the subsolidus conditions, which is consistent with the increase of the area of the D‐D' doublet when the heating time increases. Accordingly, the area of the A‐A' and B‐B' doublets decreases with the increasing heating time. However, the area of C‐C' keeps almost constant. Therefore, the 4 sets of doublets can be assigned correctly as follows: A‐A' doublet to Fe+2at M1, B‐B' Fe2+at M1, C‐C' Fe2+at M2, and D‐D' Fe3+at M1. The M1 site splitting is due to the NNN (Next Nearest Neighbour) effect of the M2 site. The amount of Fe3+at the tetrohedral site of megacrystal clinopyroxene is negligible according to this study. 相似文献
868.
内蒙古大青山地区中生代中晚期伸展构造 总被引:1,自引:0,他引:1
内蒙古大青山地区伸展构造发生于中生代中晚期 ,主要表现为由北西向南东方向多层次、多级别的剥离断层活动 ,形成了马厂沟—白银不浪、脑包沟—德兴奎及二叠系脑包沟组顺层流劈理带三个不同层次的变质核杂岩区。由此得出的结论是 ,大青山中生代山间盆地的形成及大青山的隆起与该期伸展构造作用关系密切[6] 。 相似文献
869.
Zhao Wenyu Center of Material Research Analysis Wuhan University of Technology Wuhan Liu Rong Wang QinyanFaculty of Earth Sciences China University of Geosciences Wuhan Peng Changqi Zhang QingjieCenter of Material Research Anal 《中国地质大学学报(英文版)》2001,12(3)
INTRODUCTIONItisanacknowledgedfactthataragonite,ahigh pressurepolymorphofCaCO3 ,occurswidelyasanindexmineralofhigh pressureandlow temperaturemetamorphism (glaucophaneschistfacies)withinthegeodynamiccontextofsubduction obductionandcontinentalcollision (Liou… 相似文献
870.
We deal with a multi-parameter identification problem arising in oil industry. In the general case, we give a local solvability condition to guarantee the well-posedness of the problem. We discuss in detail the identification of two parameters for which some numerical results are given. 相似文献