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51.
江西永平铜矿金属矿物化学成份及矿物包体特征 总被引:4,自引:0,他引:4
永平铜矿黄铁矿、黄铜矿的化学成份特征以及矿物测温和石英包体成份分析特征表明成矿经历了一个较低温度阶段,但所反映的后期成矿作用的改造特征也非常明显,特征是闪锌矿,其化学成份具明显的后期改造成矿特征,是岩浆热作用的产物。黄铁矿的同生成矿较为明显,闪锌矿的后期改造成矿特征更为明显,而黄铜矿具有明显的沉积改造特征。 相似文献
52.
沥青铀矿中氧同位素测定方法 总被引:2,自引:0,他引:2
本文介绍了一种直接测定沥青铀矿中氧同位素的分析方法--五氟化溴法,实验分析和数据首次表明,铀氧化物中的氧同位素主要是富轻氧的。 相似文献
53.
新疆伊犁盆地侏罗纪煤岩特征及煤相 总被引:2,自引:1,他引:2
应用煤岩学方法,探讨了新疆伊犁盆地侏罗纪煤的煤岩特征及煤相划分,将煤相划分为9种类型即干燥森林沼泽相,潮湿森林沼泽相,草木混生型沼泽相或芦苇沼炭沼泽相。通过煤相分析,为伊犁盆地成煤环境的研究提供了佐证。 相似文献
54.
55.
Properties of wave velocity for two types of granitoids at high pressure and temperature and their geological meaning 总被引:1,自引:0,他引:1
Shufeng Yang Hanlin Chen Jishuang Jiang Guoqiang Zhu Hongshen Xie Wei Hou Yueming Zhang Huigang Xu 《中国科学D辑(英文版)》1997,40(5):470-476
The wave velocity for two types of granitoids was measured using the analytic method of full-wave vibration at high pressure
and high temperature. The laws of velocity changes for them differ with the pressure boost and temperature rise, and the velocity
change of S-type is more violent than that of I-type. The “softening point” of compressional wave velocity (V μ) is also revealed
during the measurement for two types of granitoids imitating the pressure and temperature at a certain depth. But the depth
of “softening”, Vp after “softening” and the percentage of Vp’s drop around the “sofrening point” for two types of granitoids are obviously different. The depth of “softening” is 15 km
approximately and Vp after “softening” is 5.62 km/s for S-type granitoid. But for I-type granitoid the depth of “softening” is 26 km approximately
and Vp after “softening” is 6. 08 km/s. Through careful analysis of rock slices after the experiment, it was found that the “softening”
of elastic-wave velocity is caused by the partial melting of granite. Combined with the results of geophysical prospecting,
these results suggest that the low-velocity layers developing in the interior of Earth crust are related to thc partial melting
of different types of granitoids. The formation of the low-velocity layer in the upper-middle Earth crust is closely related
to the development of S-type granitoid, but that in the lower Earth crust is closely related to the development of I-type
granitoid. 相似文献
56.
Organism relics or kerogens in oils are first obsenred by a confocal laser scanning microscope (CLSM) and a transmission electron
microscope (TEM). The complexes of kerogens in oils are characterized by the presence of a great variety of microfossils or
macerals. These kerogens in oils are mainly the residues of the original organic substances from which oil formed, and minor
kerogens from enclosing rocks enter the oils, therefore, the components and types of the kerogens in crude oils can serve
as an indirect indicator of oil-source rock correlation. This method was applied to Jurassic oils in the Junggar Basin and
the Turpan-Hami Basin, and there are two types of the kerogens in oils: one containing a lot of macerals from terrestrial
plants may derive from coals, and the other, characterized by a high content of microscopic algae, fungus spores and Acritarch,
may originate from Permian organic matter. In addition, the reflectance of the vitrodetrinites in oils can be used as an indicator
of oil-source rock correlation. 相似文献
57.
58.
本文以运城市基础工作为起点,分析了地下水超采引起的一系列问题,提出了加强地下水资源保护的对策和措施. 相似文献
59.
Basin-fill sequences of Mesozoic typical basins in the Yanshan area, North China may be divided into four phases, reflecting lithosphere tectonic evolution from flexure (T3), flexure with weak rifting (J1+2), tectonic transition (J3), and rifting (K). Except the first phase, the other three phases all start with lava and volcaniclastic rocks, and end with thick coarse clastic rocks and/or conglomerates, showing cyclic basin development rather than simple cyclic rift mechanism and disciplinary basin-stress change from extension to compression in each phase. Prototype basin analysis, based on basin-fill sequences, paleocurrent distribution and depositional systems, shows that single basin-strike and structural-line direction controlling basin development had evidently changed from east-west to northeast in Late Jurassic in the Yanshan area, although basin group still occurred in east-west zonal distribution. Till Early Cretaceous, main structural-line strike controlling basins just turned to northeast by north in the studied area. 相似文献
60.
ZHAGN Yijun DONG Wansheng ZHAO Yang ZHANG Guangshu Zhang Hongfa CHEN Chengpin ZHANG Tong 《中国科学D辑(英文版)》2004,47(Z1)
The comprehensive observations on lightning discharges were conducted in Naqu area of Qinghai-Tibet Plateau in summer of 2002. The electric structures of thunderstorms and the characteristics of lightning discharges at initial stage were analyzed by using the observation data. The results show that most of intracloud (IC) lightning flashes were polarities inverted in thunderstorms with tripole electric charge structure and occurred between negative charge region located in the middle of the thunderstorm and positive charge region located at the bottom of the thunderstorm. The radiation characteristics of discharge processes in cloud with longer lasting time involved in Cloud-to-Ground (CG) lightning flashes were similar to that of IC discharges.A lot of radiation pulses were produced in these discharge processes. Because the IC discharges took place at the bottom of thundercloud and were near the ground, they may produce more serious damage to equipment on the ground therefore should not be neglected in lightning protection. 相似文献