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61.
Evolution of Ore-Forming Fluids and Ag-Cu Polymetal Mineralization in the Lanping Basin, Yunnan 总被引:1,自引:0,他引:1
EVOLUTION OF ORE-FORMING FLUIDS AND Ag-Cu POLYMETAL MINERALIZATION IN THE LANPING BASIN, YUNNAN“KeyProjectforResourcesandEconomics” (95 0 2 0 0 1 0 1)oftheMinistryofLandResources 相似文献
62.
63.
不同类型球粒陨石母体的形成过程,可作为早期太阳星云化学演化的指示剂,它们包含原始球粒陨石中残存的前太阳颗粒,可提供太阳系外恒星演化的信息;原始球粒陨矿物-岩石学特征,可揭示早期太阳星云的凝聚和吸积作用过程;原始球粒陨石主要组分的氧同位素组成,可为了解形成不同类型球粒陨石的初始物质和形成环境提供重要的依据;原始球粒陨石中富钙-铝包体和球粒的形成年龄,可作为早期太阳星云演化的时标;原始球粒陨石的氧化-还原作用特征,可推断不同类型球粒陨石母体在太阳星云内距日心距离等,并进一步探讨早期太阳星云的化学演化。 相似文献
64.
以柴油为唯一碳源和能源,从南极海水海冰微生物资源库中筛选到一株石油烃低温降解菌希瓦氏菌NJ49,并对影响其生长和降解率的环境因素(pH、温度、盐度、营养盐和表面活性剂)进行了初步研究。结果表明:希瓦氏菌NJ49可作为低温海域石油烃污染生物修复的菌源,其生长和降解的最适条件为:初始pH7.5,温度15℃,盐度6%,摇瓶装量80ml,最佳氮源硝酸铵,最佳磷源为磷酸二氢钾和磷酸氢二钾的混合物,添加表面活性剂可促进希瓦氏菌NJ49的生长和生物降解率。 相似文献
65.
内蒙武川后石花金矿床辉钼矿Re-Os同位素年龄及其地质意义 总被引:4,自引:0,他引:4
后石花金矿是华北克拉通北缘一小型石英脉型金矿床。对矿体5件辉钼矿样品的ReOs同位素分析,获得了介于280.3±3.8~283.0±3.9Ma,加权平均为282.0±1.8Ma(MSWD=0.28)的同位素模式年龄,以及一个相关性很好的等时线年龄281.9±1.8Ma(MSWD=0.57),表明矿床形成于早二叠世,推测是海西晚期古亚洲洋俯冲体制下陆缘弧背景中构造-热液成矿事件产物。综合区域资料认为,华北北缘中段在海西晚期曾发生过重要成矿作用,但多在后期被剥蚀破坏。华北北缘中段大陆弧范围内,叠加在前寒武纪结晶基底韧性剪切带之上的脆性断裂构造带,以及华北北缘早古生代增生带内部,是形成海西晚期金、钼矿床的有利部位。 相似文献
66.
Wudalianchi volcanic rocks are the most typical Cenozoic potassic volcanic rocks in easten China.Compositional comparisons between whole rocks and glasses of various occurrences indicate that the magma tends to become rich in silica and alkalis as a result of crystal differentiation in the course of evolu-tion.They are unique in isotopic composition with more radiogenic Sr but less radiogenic Pb.^87Sr/^86Sr is higher and ^143Nd/^144Nd is lower than the undifferentiated global values.In comparison to continental pot-ash volcanic rocks,Pb isotopes are apparently lower.These various threads of evidence indicate that the rocks were derived from a primary enriched mantle which had not been subjected to reworking and shows no sign of incorporation of crustal material.The correlation between Pb and Sr suggests the regional heterogeneity in the upper mantle in terms of chemical composition. 相似文献
67.
提出一种基于支持向量机的岩质边坡稳定性预测方法。该方法地很好的表达了岩质边坡稳定性与其影响因素之间的非线性映射关系,并应用该方法建立了相应的模型。预测结果表明,利用该方法进行岩质边坡稳定性预测是可行的、有效的。 相似文献
68.
Tao Wang Xin Jiang Congying Wang Fang Wang Yongrong Bian Guifen Yu 《Environmental Earth Sciences》2014,71(2):773-782
Although there has been substantial research done on adsorption of metals/metalloids by Al (oxy)hydroxides, little is known regarding the adsorption of polyaromatic hydrocarbons (PAHs) on Al (oxy)hydroxides, especially those formed in the presence of organic acid. This paper investigated the adsorption of phenanthrene on Al (oxy)hydroxides formed with initial tannate/Al molar ratios (MRs) 0, 0.001, 0.01, and 0.1 (referred to MR0, MR0.001, MR0.01, and MR0.1, respectively) through batch adsorption experiments and FTIR study. The results showed that Al (oxy)hydroxides were important sorbents for phenanthrene. The adsorption kinetic data were fitted well with the pseudo-second-order equation. According to a modified Freundlich model, the adsorption capacities of Al (oxy)hydroxides followed a descending order of MR0.1 > MR0 ≥ MR0.01 > MR0.001, which was inconsistent with the organic carbon content in the Al (oxy)hydroxides. Adsorption capacity correlated with the specific surface area, micropore area, and micropore diameter of Al (oxy)hydroxides, yet the relationships were not statistically significant (P > 0.05). FTIR results showed that physical interaction was essential in phenanthrene adsorption onto the Al (oxy)hydroxides, which could be explained by an entropy-driven process. Surface hydrophobicity of Al (oxy)hydroxides played a key role in phenanthrene adsorption. Additional π–π electron donor–acceptor interaction of phenanthrene (acting as electron donor) with aromatic ring of tannic acid (electron acceptor) could be also important in phenanthrene adsorption by high MR Al (oxy)hydroxides, yet it needs further study. The findings obtained in the present study are of fundamental significance in understanding the mechanism of immobilization of PAHs in low organic matter but oxide-rich soils. 相似文献
69.
用硝基苯萃取[Cd(Phen)3]^2+I2^-离子对,再用盐酸反萃取,利用氢化物发生-原子荧光光谱法测定镉的含量,从而间接测定碘。实验在pH=5.2的NaAc-HAc缓冲体系下进行,优化了还原剂KBH;中邻菲罗啉的浓度,镉溶液用量,萃取剂硝基苯的用量,反萃取盐酸的酸度,并制备碘的标准曲线,其线性相关系数R2≥0.9942,线性范围0~10ng/mL,精密度为8.5%,检出限0.80ng/mL,利用标准曲线测出水样中碘的浓度为17.78ng/mL,结果令人满意。实验表明,开发原子荧光光谱间接分析方法,使其能够准确测量更多种类的元素,有着十分积极的意义,同时也能够促进该方法得到更广范的应用。 相似文献
70.
The climatological summer monsoon onset displays a distinct step wise northeastward movement over the South China Sea and
the western North Pacific (WNP) (110°–160°E, 10°–20°N). Monsoon rain commences over the South China Sea-Philippines region
in mid-May, extends abruptly to the southwestern Philippine Sea in early to mid-June, and finally penetrates to the northeastern
part of the domain around mid-July. In association, three abrupt changes are identified in the atmospheric circulation. Specifically,
the WNP subtropical high displays a sudden eastward retreat or quick northward displacement and the monsoon trough pushes
abruptly eastward or northeastward at the onset of the three stages. The step wise movement of the onset results from the
slow northeastward seasonal evolution of large-scale circulation and the phase-locked intraseasonal oscillation (ISO). The
seasonal evolution establishes a large-scale background for the development of convection and the ISO triggers deep convection.
The ISO over the WNP has a dominant period of about 20–30 days. This determines up the time interval between the consecutive
stages of the monsoon onset. From the atmospheric perspective, the seasonal sea surface temperature (SST) change in the WNP
plays a critical role in the northeastward advance of the onset. The seasonal northeastward march of the warmest SST tongue
(SST exceeding 29.5 °C) favors the northeastward movement of the monsoon trough and the high convective instability region.
The seasonal SST change, in turn, is affected by the monsoon through cloud-radiation and wind-evaporation feedbacks.
Received: 19 October 1999 / Accepted: 5 June 2000 相似文献