层状多金属矿床中矿物研究的新进展     

R.L.Stanton  方九 《矿产与地质》1987,(2)

许多区域变质层状矿床一方面伴生有喷气成因的燧石、碳酸盐、硫酸盐、氟化物、磷酸盐和硼酸盐,另一方面也同样发育有变质硅酸盐。 新近显微镜下和电子显微镜下研究表明:在几分之一毫米的范围内,单一矿物(如石榴石)从一颗粒至另一颗粒其组分变化可以很大;在微细层理间,石榴石等矿物的内部分带形  相似文献   

变形硫化物矿床中三角尖顶(Cuspate ore)矿体—围岩分界面、刺穿构造和某些硫化物矿体的定位     

K.J.Maiden  L.R.Chimimba  T.J.Smalley  高坪仙 《华北地质》1987,(3)

引言许多块状硫化物矿体在总的规模上与围岩层状构造整合。尽管在变形和变质矿床可以在矿床边缘见到有小规模的不规则现象。这些地区由于三角尖顶构造仅1米或更小,并有长几米到50米或更长的硫化物矿脉通过,这些矿体的边缘可能与围岩层状构造大体上呈不整合。本文通过矿床实例说明其形成特征并对它们的成因进行探讨。  相似文献   

重褶皱的分析方法     

Richard  L  Thissen  Haviland  Terrance  扬坤光  彭少梅 《世界地质》1987,(2)

多期褶皱相互作用便产生复杂的干扰型式即叠加褶皱。构造学家可以直接解释简单构造型式,但较复杂的型式常具有多解性和不确定性。本文提出了不直接需要任何野外构造测量资料的叠加褶皱的分析方法.仅需一系列相互平行的穿过叠加褶皱的剖面,这可从矿区或从切片的岩石中获得.从平面图可鉴别各个褶皱并可计算枢纽的指向和倾伏角。赤平投影图和横剖面图可以反应褶皱的方向和形态。本方法假定:(1)第一期褶皱是圆柱状的;(2)第二期褶皱作用的运动近似相似褶皱(剪切褶皱). 上述方法被用于华盛顿州Kootenay弧地区的小尺度标本。分析指出,两期褶皱的叠加产生雁列状的共轭褶皱,非圆柱状和非相似型褶皱。本实例表明,这种方法也适用于与上述假设不相等的褶皱的叠加,对地质工作者在其它重褶地区的工作很有价值;同时还可以为矿床研究提供可靠的三维资料。  相似文献   

A Digitized Weather Radar in Gansu Province and a Simple Radar-Raingauge Comparison     

M.Blaskovic  A.Bellon  G.L.Austin  Q.M.Cai 《高原气象》1987,(2)

An on-line computer processing system was added to the LanzhouInstitute’sX-bandradar.Thepotentlal of digitized weather radar isdiscussed and a preliminary examination of the rain-measuring capabilityof the radar-computer system is made.  相似文献   

THE SENSITIVITY OF THE NUMERICAL SIMULATION TO OROGRAPHY SPECIFICATION IN THE LOWRESOLUTION SPECTRAL MODEL－PART II: IMPACT OF THE SMOOTHED OROGRAPHY AND RIPPLES ON SIMULATIONS     

Ni Yunqi  Bette L. Otto-Bliesner  David D. Houghton 《大气科学进展》1987,4(2):145-155

In order to investigate the impact of the smoothed orography and the spurious orographic ripples on simu-lations in the low-resolution spectral model, three different numerical tests, that is, the unsmoothed orography scheme, the smoothed orography scheme and non-ripples scheme are performed. In this paper, the model used by us is the same as Part I except for orographic specification.The results from simulations indicate that, as far as the climatic simulation is concerned, some aspects of the simulated stationary disturbances, zonal and meridional wind, temperature and precipitation in the low-resolu-tion spectral model with properly smoothed mountains are significantly improved, especially in winter hemis-phere.The deep ripples in the model with the unsmoothed orography produce spurious high pressure regions at the surface with subsidence, and suppress rainfall, causing an unrealistic splitting of the precipitation area in northern winter and summer. Removal of tbe deep ripples by using the special procedure for smoothing topog-raphy allows a strong upward motion in the ripple area with heavy rainfall, eliminating the unrelistic split in the precipitation area.  相似文献   

根据CT和AT对热带气旋预报方法的评价     

Russell L.Elsberry  James E.Peak  赵其庚 《气象科技》1987,(2):25-32

对1979—1983年西北太平洋热带气旋路径的正式预报和客观方法以CT和AT分量作了评定(相对于持续预报)。研究焦点在于72小时预报。CT扣AT分量分为3型时,评定结果单向热带气旋模式最好。分5型的则用非线性惩罚评分。72小时路径预报也是套网格热带气旋模式最有技巧。把移速和移向分为5型代表了5种天气影响。本研究对各种客观预报方法的相对价值给以指导,对业务预报有所帮助。  相似文献   

南极洲威尔克斯地大陆边缘的海上地球物理资料     

S.L.Eittreim  武传真 《地球物理学进展》1987,(1)

一、引言 1984年,美国地质调查局在S. P. Lee海洋调查船(图1和图2)上,做了南极洲威尔克斯地(Wilkes Land)大陆边缘的地球物理测量,这次测量得到了大约1800公里长的24道多道地震反射资料,400公里长的单道地震反射资料和其它地球物理剖面资料,包括重力、磁场梯度、3.5和12kHz高分辨率回声探测和声纳浮标折射剖面,重力和回声探测资料,是在测  相似文献   

利用遥感表面温度计算蒸散量     

J.L.Hatfiel  唐德富 《气象科技》1986,(2):66-70

引言遥感提供了计算大面积蒸散量的可能性,目前,利用气象参数计算蒸散量,这些参数既不说明种有不同作物和裸露土壤表面的空间分布,也不说明各种农田的水分状况。遥感表面温度可以是从手持辐射温度计确定几平方厘米分辨率的表面温度到用某些卫星传感装置确定几平方公里分辨率的表面温  相似文献   

Elemental concentrations and their size distributions of Beijing aerosol in January   总被引：1，自引：0，他引：1  

Wang Mingxing  Ren Lixin  Lü Weixiu  Chen Jianxin  Zeng Xianzhou  Che Jianmei 《大气科学进展》1986,3(2):199-207

Aerosol sampling was carried out at a city centre site and a suburb site in Beijing in January 1983. PIXE (Proton Induced X-ray Emission) compatible cascade impactors were employed. The samples were analysed for 20 elements by PIXE in Fudan University. It has been found that most of the elements have bi-mode size distributions with a gradual progression from mainly coarse mode Ca, Ti and Al to mainly fine mode Zn, As and Pb. Elements Cl, K, S and Si show most obvious bi-mode, of which Si and S are particularly interesting. The concentrations of coarse mode aerosol in the city centre are about 1.4 times as large as that in the suburb for most of the elements, while the concentrations of fine mode aerosol in the city centre differ greatly from that in the suburb and vary significantly among elements, indicating some industrial sources. The enrichment factors of elements indicate that the coal smoke has a large-scale influ-ence in North China.  相似文献   

树木年轮响应函数的统计显著性和可重复性     

B.M.GRAY  T.M.L.WIGLEY  J.R.PILCHER  陈道轩 《沙漠与绿洲气象(新疆气象)》1986,(8)

本文讨论响应函数的总显著性及可重复性.在二项分布的基础上设计出一种显著性检验方法.结合其他方法,此法用来比较两个不同的响应函数,以考察气候——年表响应的可重复性.结果说明,所用样本的响应,对于同一地点在统计上是可重复的,对于不同时期在统计上是稳定的.  相似文献