岩溶作用对任丘古潜山碳酸盐岩油藏赋存的控制作用   总被引：7，自引：0，他引：7  

韩宝平  刘仁达  罗承建  于俊吉  于礼山 《中国岩溶》1998,17(1):75-80

根据大量钻井及开发动态资料,研究了任丘古潜山雾迷山组白云岩岩溶发育牲特征对油藏赋存的控制作用。溶蚀孔洞是最重要的储集空间,岩溶不发育的泥质白云岩段的分隔作用,导致在全油田统一油水界面以下有残余油区赋存,古潜山面上的溶蚀残丘等局部高点是残余油赋存的有利地段。  相似文献   

Intergranular trace elements in mantle xenoliths from Russian Far East: Example for mantle metasomatism by hydrous melt     

Junji  Yamamoto  Shun'ichi  Nakai  Koshi  Nishimura  Ichiro  Kaneoka  Hiroyuki  Kagi  Keiko  Sato  Tasuku  Okumura  Vladimir S.  Prikhod'ko  Shoji  Arai 《Island Arc》2009,18(1):225-241

Based on both major and trace element chemistry, the occurrence of the intergranular component in mantle-derived xenoliths from far eastern Russia has been constrained. Whole-rock trace element measurements of one xenolith show apparent negative anomalies in Ce, Th, and high field strength elements on normalized trace element patterns. The trace element pattern of the whole rock differs from those of constituent minerals, indicating that the anomalies in the whole rock are attributable to the presence of an intergranular component. That assumption was confirmed using in situ analysis of trace elements in the intergranular substance and melt inclusion using laser ablation inductively coupled plasma–mass spectrometry. Both the intergranular component and the melt inclusions have identical trace element patterns, which mean that these materials are a cognate metasomatizing agent. The anomalies are regarded as mantle metasomatism related to an aqueous fluid. Hydrous minerals were observed on the wall of the melt inclusions using micro-Raman spectroscopy, indicating that the melt inclusions contained a large amount of water. Thus, this study reveals a trace element composition of a hydrous metasomatizing agent in the mantle.  相似文献   

广州冬季大气消光系数的贡献因子研究   总被引：12，自引：1，他引：11  

陶俊  张仁健  许振成  陈来国  朱李华  韩静磊  曹军骥 《气候与环境研究》2009,14(5):484-490

2008年1月1～31日和2月6～24日在广州城区每天采集一个PM2.5样品,对样品进行有机碳、元素碳及水溶性离子分析,利用美国IMPROVE能见度方程计算得到广州冬季大气消光系数.结果发现:冬季PM2.5 日均值质量浓度为89.0±53.4/μg·m~(-3),OC(Organics Carban)质量浓度为16.9±11.9μg·m~(-3),EC(Element Carbon)质量浓度为5.9±3.4 μg·m～(-3),水溶性离子总浓度为43.9±23.5μg·m~(-3).冬季大气消光系数均值为342±185 Mm~(-1).广州冬季大气消光系数主要贡献者为(NH_4)_2SO_4、NH_4NO_3、POM(Par-ticular organic matter)、EC和NO_2,对消光系数的贡献率分别为36.3%、14.5%、26.6%、17.4%和5.2%.  相似文献   

无人机倾斜摄影在露天矿山开采监测中的应用     

朱守信  李军吉  梁作前 《地理空间信息》2022,20(5):60-62

  相似文献   

Effects of rainfall amount and frequency on vegetation growth in a Tibetan alpine meadow   总被引：1，自引：0，他引：1  

Baocheng Zhang  Junji Cao  Yanfen Bai  Xuhui Zhou  Zhigang Ning  Songjie Yang  Lin Hu 《Climatic change》2013,118(2):197-212

Over the past decades, rainfall amount and frequency changed considerably on the Tibetan Plateau. However, how altered rainfall pattern affects vegetation growth and phenology in Tibetan alpine grasslands is poorly understood. In this study, we investigated the long-term effects of rainfall amount and frequency on production (i.e., aboveground biomass, AGB) and phenology of three perennial plants in a Tibetan alpine meadow from 1994 to 2005. Growth period (i.e., the dates from greening to senescence) was referred to plant phenology here. Our results showed that annual precipitation and total rainfall from large events (≥ 5 mm per day) were mainly distributed in the growing season, which increased significantly from 1994 to 2005 with more increment in May and July (p?<?0.05). Total AGB and growth periods of three plants were linearly correlated with annual precipitation and total rainfall from large events, but have insignificant correlations with total rainfall from small events (< 5 mm per day) and rainfall frequency (including small, large, and all events). The results suggest that aboveground plant production and phenology are more sensitive to changes in large rainfall events (≥ 5 mm per day) than small events (< 5 mm per day) in the alpine meadow ecosystems.  相似文献   

Chemical composition of PM2.5 at an urban site of Chengdu in southwestern China     

陶俊  成天涛  张仁健  曹军骥  朱李华  王启元  罗磊  张雷鸣 《大气科学进展》2013,30(4):1070-1084

PM2.5 aerosols were sampled in urban Chengdu from April 2009 to January 2010, and their chemical compositions were characterized in detail for elements, water soluble inorganic ions, and carbonaceous matter. The annual average of PM2.5 was 165g m－3, which is generally higher than measurements in other Chinese cities, suggesting serious particulate pollution issues in the city. Water soluble ions contributed 43.5% to the annual total PM2.5 mass, carbonaceous aerosols including elemental carbon and organic carbon contributed 32.0%, and trace elements contributed 13.8%. Distinct daily and seasonal variations were observed in the mass concentrations of PM2.5 and its components, reflecting the seasonal variations of different anthropogenic and natural sources. Weakly acidic to neutral particles were found for PM2.5. Major sources of PM2.5 identified from source apportionment analysis included coal combustion, traffic exhaust, biomass burning, soil dust, and construction dust emissions. The low nitrate: sulfate ratio suggested that stationary emissions were more important than vehicle emissions. The reconstructed masses of ammonium sulfate, ammonium nitrate, particulate carbonaceous matter, and fine soil accounted for 79% of the total measured PM2.5 mass; they also accounted for 92% of the total measured particle scattering.  相似文献   

Direct ascent to the surface of asthenospheric magma in a region of convex lithospheric flexure     

Yuki Sato  Naoto Hirano  Shiki Machida  Junji Yamamoto  Masao Nakanishi  Teruaki Ishii 《International Geology Review》2018,60(10):1231-1243

The stress field of oceanic lithosphere controls the distribution of submarine petit-spot volcanoes. However, the eruption sites of these petit-spot volcanoes are considered to be limited to concavely flexed regions of lithosphere off the outer rise. Here, we present new data for a recently identified petit-spot lava field on a convexly flexed section of the lithosphere adjacent to the subduction zone offshore of northeast Japan in an area containing more than 80 volcanoes. This area is marked by strongly alkaline lavas that were erupted on the convexly flexed region. As for the concavely flexed region where the petit-spots previously reported, the base of the lithosphere beneath the eruption sites is under extension, whereas the upper part of the lithosphere is under compression. This change in the stress field, from the lower to upper lithosphere, causes ascending dikes to stall in the mid-lithosphere, leading to metasomatic interaction with the surrounding peridotite. The new geochemical data of rocks and xenocrysts presented in this study indicate that strongly alkaline magmas erupted on the convexly flexed region would have ascended more rapidly through the mid-depth of lithosphere because of the extensional regime of the upper lithosphere and decreasing the degree of metasomatic reaction with the surrounding mantle peridotite. The results indicate that the degree of metasomatism and the compositional variations of petit-spot magmas are controlled mainly by the stress field of the lithosphere.  相似文献   

A model for the infrared brightening of a Nova shell     

Tetsuo Yamamoto  Junji Seki 《Astrophysics and Space Science》1979,64(1):153-164

A model for grain formation in an expanding Nova shell is presented. It is shown that individual grains complete the growth within a very short time interval. In consequence the infrared brightening accompanied with visual darkening observed in several Novae is interpreted in terms of extension of dusty region in the ejected gas shell. Developments of infrared luminosity and visual magnitude are computed on the basis of a model, and compared with the observations of Nova Vul 1976, Nova Ser 1970, and Nova Aql 1975. The constancy and uniformity of grain temperatures for a long period after the infrared maximum observed in Nova Vul 1976 are also discussed.  相似文献   

Impacts of different diffusion scenarios for mitigation technology options and of model representations regarding renewables intermittency on evaluations of CO2 emissions reductions     

Fuminori Sano  Keigo Akimoto  Kenichi Wada 《Climatic change》2014,123(3-4):665-676

This paper evaluated the impacts of climate change mitigation technology options on CO₂ emission reductions and the effects of model representations regarding renewable intermittency on the assessment of reduction by using a world energy systems model. First, different diffusion scenarios for carbon dioxide capture and storage (CCS), nuclear power, and wind power and solar PV are selected from EMF27 scenarios to analyze their impacts on CO₂ emission reductions. These technologies are important for reducing CO₂ intensity of electricity, and the impacts of their diffusion levels on mitigation costs are significant, according to the analyses. Availability of CCS in particular, among the three kinds of technologies, has a large impact on the marginal CO₂ abatement cost. In order to analyze effects of model representations regarding renewables intermittency, four different representations are assumed within the model. A simplistic model representation that does not take into consideration the intermittency of wind power and solar PV evaluates larger contributions of the energy sources than those evaluated by a model representation that takes intermittency into consideration. Appropriate consideration of renewables intermittency within global energy systems models will be important for realistic evaluations of climate change mitigation scenarios.  相似文献   

中新世以来我国季风-干旱环境演化与青藏高原的生长^*   总被引：20，自引：38，他引：20       下载免费PDF全文

安芷生  张培震  王二七  王苏民  强小科  李力  宋友桂  常宏  刘晓东  周卫健  刘卫国  曹军骥  李小强  沈吉  刘禹  艾莉 《第四纪研究》2006,26(5):678-693

根据中国北方地质、生物和构造记录与南海及全球记录的对比研究, 讨论了中国中新世以来季风-干旱环境与青藏高原阶段性生长耦合演化的关系。研究认为, 在研究季风环境的同时, 应加强我国季风-干旱环境整体系统变迁及其动力学的研究。  相似文献