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941.
通 过 钱家 营井 田 203泥石 流 突发 事故 ,对 陷落 柱 的形 成机 理 作进 一步 的 研究 ,巷 道临 空 空间 、构 造破 碎带 、高压 地下 水 的存 在是 煤 系砂 岩地 层 中形 成现 代 陷落 柱的 主 要控 制因 素 。 相似文献
942.
Enhancement of removal efficiency of ammonia nitrogen in sequencing batch reactor using natural zeolite 总被引:1,自引:1,他引:1
Two sets of lab-scale sequencing batch reactors (SBR), i.e., control SBR and SBR using zeolite as carrier (zeo-SBR), were
applied to assess nitrogen removal efficiency. The test results revealed that zeolite powder added in SBR could improve its
performance. Due to the combination of zeolite adsorption for NH4
+–N and enhanced simultaneous nitrification and de-nitrification (SND), a higher removal ratio of ammonia nitrogen in wastewater
was observed in the test reactor, and the introduction of zeolite powder was helpful to inhabit sludge bulging comparing with
the control SBR, in other words, activated sludge immobilized by zeolite powder could remove NH4
+–N, COD, and PO4 significantly in a shorter cycle time. Applied two hydraulic retention times (HRTs) showed that the nitrogen and phosphorus
removal could be improved while adapting to load variations. 相似文献
943.
小莱河太古宙麻粒岩相铁建造的矿物组合有:①斜方辉石(Fs87)+钙铁辉石+石英+磁铁矿±莱河矿;②铁闪石+铁浅闪石质角闪石+石英+磁铁矿+碳酸盐±Fe-镁川石(云辉闪石)。辉石的出溶显示了它形成的不同阶段:片晶发育的OpxⅡ-CpxⅡ是最后稳定产物,计算的平衡温度是742℃,按相图获得的压力是7×108~7.8×108Pa;钙铁辉石中“001”片晶是易变辉石片晶转变的,Opx-Cpx-Pig(片晶)阶段据相图推测可能形成于近820℃,8×108Pa的条件下。原始均一相的OpxⅠ-CpxⅠ阶段矿物成分按估算的片晶含量计算,它们的形成温度接近820℃,可能的压力范围是11×108~13×108Pa。由此得到ITD型麻粒岩相p-T-t轨迹。莱河矿无氧化成因的证据,认为它是在麻粒岩相条件下生成的。云辉闪石的Si—O链重复周期是3×,其Fe/(Fe+Mg)=0.85,是接近富铁端元的Fe-镁川石,它与闪石一起在640到近700℃条件下交代了辉石。 相似文献
944.
On the basis of the geological and geochemical studies, including chemical analysis of bulk rocks, rare-earth and trace element studies, fluid inclusion, and S and O isotopic analyses, the authors described the geo-logical background of the deposit in detail and presented significant proofs for the conditions of formation of the Shaxi porphyry copper-gold deposit. Compared with other large and supper-large porphyry copper deposits in China and the adjacent Cu-Au mineralized areas, the ore-forming processes and conditions were analyzed; and the possibil-ity of forming large porphyry copper deposits in the Shaxi area was discussed. The present study indicated that the ore-forming fluid and material were mainly of magmatic origin, while meteoric water played a certain role in the ore-forming processes. Interactions between subducting and overriding plates provided a major driving force for the formation of igneous rocks and the deposition of metal elements in East China since Jurassic. Based on the geo-chemical data of the Shaxi intrusive, it is found that the copper (gold) mineralization is closely related to the genesis of adakite-like intrusive in the Shaxi area. This adakite-like intrusive was formed in the subduction environment as a result of the subduction of the West Pacific plate toward the East China continent, where there is a great potential-ity to form a large porphyry copper deposit. 相似文献
945.
Lin-gun Liu C.-C. Lin Y. J. Yung T. P. Mernagh T. Irifune 《Physics and Chemistry of Minerals》2009,36(3):143-149
K-lingunite is a high-pressure modification of K-feldspar that possesses the tetragonal hollandite structure. Variations of
the Raman spectra of K-lingunite were studied up to ~31.5 GPa at room temperature, and in the range 79–823 K at atmospheric
pressure. The Raman frequencies of all bands were observed to increase with increasing pressure, and decrease with increasing
temperature for K-lingunite. This behavior is in line with those observed for most of other materials. New sharp Raman bands
appear at pressures greater than 13–15 GPa, suggesting a phase transition in K-lingunite with increasing pressure. The transition
is reversible when pressure was released. The appearance of these new Raman bands may correspond to the phase transition revealed
earlier at around 20 GPa by X-ray diffraction studies. Instead of transforming back to its stable minerals, such as orthoclase,
microcline or sanidine, K-lingunite became amorphous in the temperature range 803–823 K at atmospheric pressure. 相似文献
946.
常规处理方法往往漏掉一些有价值的薄油气储层。利用频率域反槽积方法、贝叶斯反褶积方法、反褶积与光滑滤波组合(DFSN)方法和分辨率匹配与非线性拟合方法对测井曲线进行了提高纵向分辨率处理,测井曲线的纵向分辨率可提高1~4倍,一些结果得到了证实,为准确地定量评价薄储居提供了较可靠的参数 相似文献
947.
Shangyue Shen Qinglai Feng Wenqiang Yang Zhibin Zhang Chongpom Chonglakmani 《中国地球化学学报》2010,29(4):337-342
Late Permian-Early Triassic (P2-T1) volcanic rocks distributed on the eastern side of ocean-ridge and oceanic-island basalts in the Nan-Uttaradit zone were
analyzed from aspects of petrographic characteristics, rock assemblage, REE, trace elements, geotectonic setting, etc., indicating
that those volcanic rocks possess the characteristic features of island-arc volcanic rocks. The volcanic rock assemblage is
basalt-basaltic andesite-andesite. The volcanic rocks are sub-alkaline, dominated by calc-alkaline series, with tholeiite
series coming next. The chemical composition of the volcanic rocks is characterized by low TiO2 and K2O and high Al2O3 and Na2O. Their REE patterns are of the flat, weak LREE-enrichment right-inclined type. The trace elements are characterized by the
enrichment of large cation elements such as K, Rb and Ba, common enrichment of U and Th, and depletion of Nb, Ta, Zr and Hf.
The petrochemical plot falls within the field of volcanic rocks, in consistency with the plot of island-arc volcanic rocks
in the Jinsha River zone of China. This island-arc volcanic zone, together with the ocean-ridge/oceanic island type volcanic
rocks in the Nan-Uttaradit zone, constitutes the ocean-ridge volcanic rock-island-arc magmatic rock zones which are distributed
in pairs, indicating that the oceanic crust of the Nan-Uttaradit zone once was of eastward subduction. This work is of great
significance in exploring the evolution of paleo-Tethys in the Nan-Uttaradit zone. 相似文献
948.
949.
Comparative analysis of contributing parameters for rainfall-triggered landslides in the Lesser Himalaya of Nepal 总被引:6,自引:0,他引:6
Ranjan Kumar Dahal Shuichi Hasegawa Minoru Yamanaka Santosh Dhakal Netra Prakash Bhandary Ryuichi Yatabe 《Environmental Geology》2009,58(3):567-586
In the Himalaya, people live in widely spread settlements and suffer more from landslides than from any other type of natural
disaster. The intense summer monsoons are the main factor in triggering landslides. However, the relations between landslides
and slope hydrology have not been a focal topic in Himalayan landslide research. This paper deals with the contributing parameters
for the rainfall-triggered landslides which occurred during an extreme monsoon rainfall event on 23 July 2002, in the south-western
hills of Kathmandu valley, in the Lesser Himalaya, Nepal. Parameters such as bedrock geology, geomorphology, geotechnical
properties of soil, and clay mineralogy are described in this paper. Landslide modeling was performed in SEEP/W and SLOPE/W
to understand the relationship of pore water pressure variations in soil layers and to determine the spatial variation of
landslide occurrence. Soil characteristics, low angle of internal friction of fines in soil, medium range of soil permeability,
presence of clay minerals in soil, bedrock hydrogeology, and human intervention were found to be the main contributing parameters
for slope failures in the region. 相似文献
950.
Nicola Nocilla Aldo Evangelista Anna Scotto di Santolo 《Rock Mechanics and Rock Engineering》2009,42(5):815-833
In recent years, rock fall phenomena in Italy have received considerable attention for risk mitigation through in situ observations
and experimental data. This paper reports the study conducted at Camaldoli Hill, in the urban area of Naples, and at Monte
Pellegrino, Palermo, Italy. The rocks involved are volcanic Neapolitan yellow tuff (NYT) in the former area and dolomitic
limestone in the latter. Both rocks, even though with different strength characteristics, have shown a significant tendency
towards rock fragmentation during run out. This behavior was first investigated by comparing the volumes of removable blocks
on the cliff faces (V
0) and fallen blocks on the slopes (V
f). It was assumed that the ratio V
f/V
0 decreases with the distance (x
f) from the detachment area by an empirical law, which depends on a coefficient α, correlated with the geotechnical properties of the materials involved in the rock fall. Finally, this law was validated
by observation of well-documented natural rock falls (Palermo) and by in situ full-scale tests (Naples). From the engineering
perspective, consideration of fragmentation processes in rock fall modeling provides a means for designing low-cost mitigation
measures. 相似文献