蒙阴县苏家沟科马提岩     

张荣隋  司荣军  宋炳忠  刘述敏 《山东国土资源》1998,(1)

苏家沟科马提岩呈透镜状残留体赋存于早元古代二长花岗岩中,主要由蛇纹石化橄榄科马提岩、透闪石岩、透闪片岩、阳起透闪片岩、绿泥透闪片岩、黑云阳起片岩等组成,具典型的鬣刺结构及变余鬣刺结构。该科马提岩的岩石学、岩石化学及结构特征与世界典型地区科马提岩极为相似,属橄榄科马提岩。  相似文献   

淄博市淄川区规范土地交易市场建设     

于学军  司书江 《山东国土资源》2007,23(11):58-59

规范、完善的土地交易市场，不仅是地方经济社会发展与成熟的重要标志，也是保证土地资源参与宏观调控的有利手段。近年来，淄博市国土资源局淄川区分局为进一步加强土地管理，积极发挥有形土地市场的作用，满足地方经济发展用地需求，逐步探索出了土地交易市场建设“一二三四五”的工作思路，不仅扭转了土地需求决定土地供给的局面，而且创造了良好的用地环境，为淄川区的经济发展注入了强大活力。  相似文献   

内蒙古地区T639气象要素预报性能评估检验     

荀学义  胡英华  张旭  斯琴  韩仲强 《气象科技》2015,43(4):647-658

通过T639模式预报产品在内蒙古地区降水量、2 m温度、相对湿度和10 m风向、风速及降水过程预报效果的适用性研究,得出以下结论,温度和相对湿度预报的准确率较风向、风速明显偏高,温度和相对湿度预报的误差系统偏小,风速预报误差偏大的概率较大;降水量的预报准确率随降水等级增加而递减,对小雨而言,模式漏报率小于空报率,多报降水的偏差和少报降水的偏差相近。在预报要素空间分布上,风向预报的偏差顺时针偏转,其夹角小于45°,温度预报偏差总体偏小,相对湿度预报偏差由西向东表现为“+、-、+、-”的分布特征;小雨和中雨落区预报偏大,暴雨落区预报偏小;贝加尔湖冷涡强度的预报偏强,西太平洋副热带高压的强度预报偏弱,影响范围偏西偏北。  相似文献   

Evaluation of the Historical Sampling Error for Global Models          下载免费PDF全文

SHEN Si  LIU Juan-Juan  WANG Bin 《大气和海洋科学快报》2015,8(5)

Various ensemble-based schemes are employed in data assimilation because they can use the ensemble to estimate the flow-dependent background error covariance. The most common way to generate the real-time ensemble is to use an ensemble forecast; however, this is very time-consuming. The historical sampling approach is an alternative way to generate the ensemble,by picking some snapshots from historical forecast series.With this approach, many ensemble-based assimilation schemes can be used in a deterministic forecast environment. Furthermore, considering the time that it saves, the method has the potential for operational application.However, the historical sampling approach carries with it a special kind of sampling error because, in a historical forecast, the way to integrate the ensemble members is different from the way to integrate the initial conditions at the analysis time(i.e., forcing and lateral boundary condition differences, and ‘warm start' or ‘cold start' differences). This study analyzes the results of an experiment with the Global Regional Assimilation Prediction System-Global Forecast System(GRAPES-GFS), to evaluate how the different integration configurations influence the historical sampling error for global models. The results show that the sampling error is dominated by diurnal cycle patterns as a result of the radiance forcing difference.Although the RMSEs of the sampling error are small, in view of the correlation coefficients of the perturbed ensemble, the sampling error for some variables on some levels(e.g., low-level temperature and humidity, stratospheric temperature and geopotential height and humidity), is non-negligible. The results suggest some caution must be applied, and advice taken, when using the historical sampling approach.  相似文献   

The vertical structure of the atmospheric boundary layer over the central Arctic Ocean   总被引：2，自引：1，他引：1  

BIAN Lingen  MA Yongfeng  LU Changgui  LIN Xiang 《海洋学报(英文版)》2013,32(10):34-40

The tropopause height and the atmospheric boundarylayer （PBL） height as well as the variation of inversion layer above the floating ice surface are presented using GPS （global position system ） radiosonde sounding data and relevant data obtained by Chinas fourth arctic scientific expedition team over the central Arctic Ocean （86°-88°N, 144°-170°W） during the summer of 2010. The tropopause height is from 9.8 to 10.5 km, with a temperature range between -52.2 and -54.10C in the central Arctic Ocean. Two zones of maximum wind （over 12 m/s） are found in the wind profile, namely, low- and upper-level jets, located in the middle troposphere and the tropopause, respectively. The wind direction has a marked variation point in the two jets from the southeast to the southwest. The average PBL height determined by two methods is 341 and 453 m respectively. These two methods can both be used when the inversion layer is very low, but the results vary significantly when the inversion layer is very high. A significant logarithmic relationship exists between the PBL height and the inversion intensity, with a correlation coefficient of 0.66, indicating that the more intense the temperature inversion is, the lower the boundary layer will be. The observation results obviously differ from those of the third arctic expedition zone （800-85° N）. The PBL height and the inversion layer thickness are much lower than those at 870-88° N, but the inversion temperature is more intense, meaning a strong ice- atmosphere interaction in the sea near the North Pole. The PBL structure is related to the weather system and the sea ice concentration, which affects the observation station.  相似文献   

The physical simulation of wave groups and their variations in a wave flume     

LIU Si  ZHANG Yongliang  LIU Shuxue  LI Jinxuan  XIA Zhisheng 《海洋学报(英文版)》2013,32(11):68-73

The physical simulation method of wave groups in a wave flume is proposed and verified by the exper- iments. The experimental results demonstrate that random waves with desired wave groupiness, which simultaneously includes the wave group height and length, can be generated satisfactorily at the specified position in a wave flume using the proposed method. Furthermore, the transformation properties of the wave groupiness along the fiat-bottomed wave flume are investigated based on the physically simulated waves. Associated proposals with the physical simulation of wave groups are given.  相似文献   

Native antimony in the Baogutu gold deposit (west Junggar,NW China): Its occurrence and origin     

Fang An  Yongfeng Zhu 《Ore Geology Reviews》2010,37(3-4):214-223

The Baogutu gold deposit, West Junggar (Xinjiang, NW China), is composed of quartz–sulfide veins and their stockworks and is hosted within an Early Carboniferous volcanic–sedimentary sequence. Three ore-forming paragenetic stages can be identified: coarse-grained quartz–sulfide vein (stage I), gold-bearing fine-grained quartz–sulfide vein (stage II), and native antimony-bearing calcite–sulfide veinlets (stage III). The estimated formation temperatures (approximately 360 to 220 °C), fS₂ (? 7 to ? 15 log units), and fO₂ (? 26 to ? 43 log units) decrease from stage I, through stage II, to stage III. The nature of the hydrothermal fluid changed from weakly acidic (pH: 5 to 6 at stage I) to alkaline (pH: > 7 at stage III).Two different occurrences of native antimony could be identified: one coexists with chalcopyrite and pyrrhotite, whereas the other occurs as isolate grains within calcite veins. Native antimony (up to 100 μm in size) contains minor amounts of As (2.0 to 2.7 wt.%); empirical formula Sb_0.95–0.96As_0.03–0.04. Decrease of temperature and fO₂ at high pH and low fS₂ conditions favored co-precipitation of native antimony–ullmannite assemblages and the decomposition of tetrahedrite. Native antimony crystallized later than the native gold, suggesting fractionation between Au and Sb during the hydrothermal evolution of the deposit.  相似文献   

Characteristics and potential environmental consequence of weathered materials in the surface layer of a spontaneously combusting mine spoil stockpile     

W. Lu  C. Lin  Y. Ma  S. Huang  C. Si  Y. Liu  J. Li 《Applied Geochemistry》2010

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中国海相油气田勘探实例之十三 塔里木盆地东河塘海相砂岩油田勘探与发现   总被引：3，自引：1，他引：2  

周新源  杨海军  胡剑风  朱永峰 《海相油气地质》2010,15(1):73-78

东河塘油田位于新疆库车县,构造上隶属于塔里木盆地塔北隆起轮台凸起东河塘断裂构造带,是我国发现的第一个高产高丰度海相砂岩油田,它的发现是中国海相砂岩油气勘探理论和实践的一次重大突破。油田发现于1990年7月,至1994年探明石油地质储量3323.13×104t,天然气地质储量15.5×108m3,至2009年底累计产原油825.75×104t。石炭系东河砂岩油藏是东河塘油田的主体,其储层东河砂岩段是一套滨岸相砂体,具有厚度巨大、埋深大、储集性能好的特点;其油藏类型为块状底水背斜油藏,产能高,储量丰度高。论述了东河塘油田勘探与发现的历程,剖析了取得勘探成功的实践认识与意义。  相似文献   

鹤岗煤田深部煤炭资源潜力分析研究   总被引：2，自引：0，他引：2  

李纯杰  司黎  王志林 《中国煤炭地质》2010,(5):18-22

根据矿区已有地质资料,从构造、沉积古地理环境分析,认为鹤岗煤田深部与煤田现生产区属同一个沉积环境,其古构造条件、沉积体系及成煤环境相同,煤田深部预测区是生产区的延深。依据钻探、物探对深部构造及煤层的控制,证实煤田深部煤层发育较稳定,具有一定的煤炭资源潜力,值得进一步勘查和开发利用。  相似文献