发挥地勘行业技术优势为河南大农业发展战略服务     

张兴辽  米清海  毛同春  朱嘉伟  符光宏 《河南国土资源》1999,(3)

河南是农业和矿业大省,农业地质可以为我省农业发展做出新贡献,且已取得了明显实效,如钾镁肥开发等。发挥地勘行业的技术优势,可以开展以下四个方面的工作:1.开展农业地质生态环境遥感综合调查评价,为农业生产布局服务;2.开展农用矿物肥料开发研究,致力于提高农产品的品质;3.加大天然矿物饲料开发力度,提高畜产品的品质;4.开展缺水地区地下水资源调查。在我省农业地质刚起步的现阶段,应重点培育该学科并提倡多学科联合攻关,营建适应科技创新的新机制。  相似文献   

金沙江-红河构造带北段囊谦盆地新生代高钾岩石40Ar/39Ar年代学研究   总被引：8，自引：5，他引：3  

朱丽  张会化  王江海  周江羽  解广轰 《大地构造与成矿学》2006,30(2):241-247

9个黑云母样品高精度~(40)Ar/~(39)Ar法定年结果表明,囊谦盆地高钾岩浆的活动年限为37.1~37.8Ma。高钾岩石在地质背景和岩石类型上与青藏东缘发现的两类高钾岩系中的早期高钾岩浆岩具有可比性,它们可能形成于相同的构造背景。结合前人的同位素年代学研究资料,金沙江-红河构造带南、北段高钾岩浆活动的时间分别为40~24Ma和40~33Ma,南、北段高钾岩浆活动时间的差异可能指示陆内俯冲作用时限的差异。  相似文献   

The Kuroshio near the Luzon Strait and circulation in the northern South China Sea during August and September 1994   总被引：3，自引：0，他引：3  

Yaochu Yuan  Guanghong Liao  Chenghao Yang 《Journal of Oceanography》2008,64(5):777-788

Wind data from NCEP and hydrographic data obtained from August 28 to September 10, 1994 have been used to compute circulation in the northern South China Sea and near Luzon Strait using three-dimensional diagnostic models with a modified inverse method. The numerical results are as follows: the main Kuroshio is located above 400 m levels near Taiwan’s eastern coast and above 800 m levels away from it. Near Luzon Strait above 400 m levels a branch of the Kuroshio joins with a part of the northward current, which comes from an area west of Luzon’s western coast and intrudes northwestward, then it branchs into western and eastern parts near 20°30′ N. The eastern part flows northward into an area east of Taiwan, while its western part continues to intrude northwestward, flowing through an area southwest of Taiwan. Net westward intruded volume transport through longitude Section AB at 121°00′ E from 19°00′ N to 21° 43′ N is about 3.5 × 10⁶ m³s⁻¹ in a layer above 400 m levels. The anticyclonic eddies W1 and W3 exist above 700 m levels east of Dongsha Islands and below 200 m levels in the eastern part of the region, respectively. The circulation in the middle region is dominated mainly by a basin-scale cyclonic gyre, and consists of three cyclonic eddies. Strong upwelling occurs in the middle region. The joint effect of baroclinity and relief and interaction between wind stress and relief both are important for real forcing of flow across contours of fH ⁻¹ in effecting the circulation pattern.  相似文献   

A diagnostic calculation of the circulation in the upper and middle layers of the Luzon Strait and the northern South China Sea during March 1992   总被引：2，自引：0，他引：2  

Yaochu Yuan  Guanghong Liao  Chenghao Yang 《Dynamics of Atmospheres and Oceans》2009,47(1-3):86-113

Wind data from NCEP and hydrographic data obtained during 8–27 March 1992 have been used to compute circulation in the Luzon Strait and the northern South China Sea using three-dimensional diagnostic models with a modified inverse method. Numerical results are as follows: the main Kuroshio is located above 800 m levels. It has two intrusive branches of the Kuroshio in the areas above 400 m. One part intrudes anti-cyclonically northwestward, then flows through the area above 200 m southwest of Taiwan and into the Taiwan Strait. The other part intrudes westward and flows cyclonically in the areas north of the cyclonic eddies, then flows southward through the southern boundary of the region. The net westward volume transport (VT) through Section at 120°15′E between Luzon Island and Taiwan Island is about 3.0 Sv, net northward VT through northern boundaries into the Taiwan Strait is about 1.4 Sv and net southward VT through southern boundaries is about 1.6 Sv, which finally flows into the Karimata and Mindoro Straits. In the areas above 400 m east of 117°15′E, the circulation is mainly dominated by the basin-scale cyclonic gyre, which consists of two cyclonic eddies. However, in the areas below 400 m east of 119°00′E, the circulation is mainly dominated by basin-scale anti-cyclonic gyre. The joint effect of baroclinity and relief and interaction between wind stress and relief are important in different area respectively for the pattern of the depth-averaged flow across contours of fH⁻¹.  相似文献   

Major Element Compositions and Rare—earth Element Abundaces of Cenozoic Basalts in Eastern China：Implications for a Pressure Control over LREE／HREE Fractionation in Continental Basalt     

刘丛强  AKIMASAMASUDA 《中国地球化学学报》1992,11(4):289-313

Major element compositions and rare-earth element (REE) and transition element(Ni,Cr and V) abundances have been determined on 44 basalt samples from eastern China.These basalts have SiO2 contents ranging from 38.63 to 55.24(wt.%),and Na2O K2O from 3.1 to 9.4(wt.%).Ni and Cr abundances are largely variable,respectively falling in ranges 60-605 and 78-1150 ppm.REE abundances,especially light rare-earth elements(LREE), are highly variable.La/Sm and La/Yb ratios vary 2.8 to 7.6 and 1.8 to 8.1. Although the segregation mainly of olivine and clinopyroxene is requested to account for the vari-able and low MgO,CaO/Al2O3,Cr and Ni characteristic of these basalts studied here,the differ-ences in REE composition of the basalts are still related mainly to the partial melting process.Obvious varations in REE abundances could be principally attributed to the partial melting process.Obvious variations in REE abundances could be principally attributed to the partial melting processes that took place at different depths,in spite of some variations caused by the fractional crystallization processes.REE abundances and La/Sm and La/Yb ratios systematically decrease with increasing SiO2,which probably indicated that the basaltic magma derived from a deeper level has higher LREE and LREE/HREE ratios than that from a shallower level.As viewed from the fact that the D^Yb/D^La ratios of clinopyroxenes in the basaltic system increase with increasing pressure,the increase of LREE/HUEE ratios with increasing melting depth can be interpreted as the pressure dependence of bulk D^HREE/D^LREE ratios of silicate minerals,in addition to the pressure control over the melting degree.  相似文献   

广州市CORS系统实时动态定位精度测试   总被引：2，自引：0，他引：2  

张西军  唐卫明  曾广鸿  马强  姜卫平 《测绘信息与工程》2008,33(5)

分析了GZCORS试运行阶段的实时动态GPS定位数据,验证了其实时动态定位初始化时间、定位精度、时间可用性等都优于设计精度,表明了其具有很好的定位精度和稳定性.  相似文献   

基于CMIP5模式与Argo观测数据的海洋有效重力势能分析     

牛凡  王涛  廖光洪 《海洋学报》2020,42(5):65-76

有效重力势能作为重力势能中活跃的部分,能够参与海洋能量循环。本文计算和评估了CMIP5中9个模式的全球大洋2 000 m以上积分的有效重力势能和200～500 m深度范围内的中尺度有效重力势能,并与由BOA_Argo观测数据计算的结果进行比较。分析表明,就全球大洋2 000 m以上积分的有效重力势能而言,多数模式的计算结果均大于由Argo观测数据计算的结果。通过比较有效重力势能的空间分布特征,发现在强动力活跃区（特别是黑潮、湾流、南极绕极流区）,模式与观测相差较大,其差别主要来源于观测与模式中扰动密度的差异。此外,在黑潮和南大洋区域,涡动能和有效重力势能具有较高的时间相关性,而在北大西洋湾流区域,两者的相关性较低;功率谱分析显示中尺度有效重力势能与涡动能都存在显著的半年和年变化周期。  相似文献   

西北干旱区典型水库浮游植物群落结构特征及驱动因子     

杨宋琪  高兴亮  王丽娟  祖廷勋  王丹霞  罗光宏 《湖泊科学》2021,33(2):377-387

为了解西北干旱区水库浮游植物群落结构特征,并进一步探究浮游植物与环境因子之间的相关关系,于2017年对张掖境内不同分布区域的8座典型水库进行为期4个季度的采样调查.结果显示,调查期间共计检出浮游植物8门106属294种,其中硅藻门、绿藻门和蓝藻门占比分别为48.35％、26.64％和14.47％.浮游植物密度在0.3×...  相似文献   

Petrographic characteristics and several other related problems of the layered basic-ultrabasic intrusives in the Upper Yangtze Valley     

Ruoxin Liu  Guanghong Xie  Jizhong Ni 《中国地球化学学报》1982,1(1):51-68

Three iron, titanium-rich layered basic-ultrabasic intrusives have been described. They occur in an approximately south-north striking belt of tectonic-magmatic complex within an anteklise. Iron and titanium were concentrated in the lower or middle-lower parts of these intrusives at the early and the middle stages of differentiation, during which FeO may have played an important role. Intimate spacial and temporal association as well as common petrochemical features (i.e., high iron and titanium contents) have been found between these layered intrusives and the syenite and alkali-syenite plutons. All of these rocks are considered as hypogene products of the differentiation of the Omeishan basaltic magma. In other words, the hypogene differentiation of the iron (titanium)-rich, sub-alkali Omeishan basltic magma under the same structural-geological conditions resulted in the formation of the rock series of layered intrusives (peridotite → iron, titanium-rich ultramafic rocks → iron-, titanium-rich gabbro, plagioclasite) → syenite, alkali-syenite.  相似文献   

The age of anorthosite events and their geological implications     

Fudao Zhong  Guanghong Xie 《中国地球化学学报》1982,1(1):96-104

It is proposed by the authors in the light of isotopie age data available that anorthosite events are advisable to be assigned to two periods, i.e., the Karelian period (1,700–2,00 m.y.) and the Grenville period (1.000–1.300 m.y.), rather than simply to a time span of 1,300±200 m.y. as suggested by N. Herz in 1969. This division is in agreement with the earth history. It is noticed that anorthosites always occur in the mobile zones between plates, indicating a close relationship with deep faults. Anorthosites of the Karelian period are found principally in tectonic zones that strike approximately NWW or NEE in Eurasian (possibly North American) plate. Grenville anorthosites, constituting two (possibly three) belts running roughly in NNE or NNW direction, occur in orogenic zones marginal to the present continents resulting from the breaking up of Pangaca. This suggests that the breaking up of the ancient continent of Pangaea started to operate as early as late Precambrian and was probably responsible for the continental drift along these tectonic belts during late Palaeozoic.  相似文献