新疆额尔齐斯地区裂谷火山岩的初步研究   总被引：3，自引：0，他引：3  

卫管一  倪志清 《矿物岩石》1990,10(3):15-23

新疆富蕴县西部上石炭统喀喇额尔齐斯组的变质火山岩,是一套多旋回双峰式古裂谷型火山岩.基性成员为玄武岩。酸性成员为流纹岩.基性岩套由拉斑玄武岩-碱性玄武岩组成.微量元素分配模式证明了地幔成分不均一性;玄武岩浆来自石榴二辉橄榄岩44％的分批熔融;证明古裂谷是在岛弧基础上演化形成。从而说明额尔齐斯断裂带经历了俯冲-碰撞-裂谷三个演化阶段.晚期的碱性玄武岩喷发,标志裂谷作用的消亡.  相似文献   

国内首次发现的光彩石     

倪云祥  张亚萍等 《矿物学报》1990,10(1):85-90

光彩石产于福建省南平稀有金属花岗伟晶岩矿田的石英－白云母－锂辉石伟晶岩中与磷锂铝石，天蓝石等紧密共生，是由原生磷锂铝石交代蚀变生成的次生矿物。本文系统地展示了南平光彩石的产状及共生组合、物性及光性特征、化学成分、X射线衍射特征、红外光谱、差热特征等。 指出了光彩石的产出与否是判定伟晶岩稀有金属矿化的标志。  相似文献   

DIAGNOSTIC STUDY FOR INTRASEASONAL OSCILLATION OF THE MIDDLE-HIGH LATITUDES IN A LOW RESOLUTION GLOBAL SPECTRAL MODEL     

Zhang Qin  Ni Yunqi  Lin Wuyin  Wang Zhaomin  D. D. Houghton 《Acta Meteorologica Sinica》1991,5(4):411-425

In this paper, five-year simulated data from a low-resolution global spectral model with triangular trunca-lion at wavenumber 10 are analyzed in order to study dynamical features and propagation characteristics ofintraseasonal oxillations over the mid-latitudes and the tropical atmosphere. The simulations show that thereis the 30-50 day periodic oscillation in the low-resolution spectral model without non-seasonal external forcing,and spatial scale of the intraseasonal oscihations is of the globe .Further analysis finds that propagation charac-ters of intraseasonal oscillations over the mid-latitudes and the tropics are different. The 30-50 day oscillationover the tropics exhibits structure of the velocity potential wave with wavenumber 1 in the latitudinal and thecharacter of the traveling wave eastward at speed of 8 longitudes/day. However, the 30-50 day oscillationsin mid-latitude atmosphere exhibit phase and amplitude oscillation of the standing planetary waves and theyare related to transform of teleconnection patterns over the mid-latitudes. The energy is not only transferredbetween the tropics and the middle-high latitudes, but also between different regions over the tropics. Based on the analysis of 5-year band pass filtered data from a 5-layer global spectral model of Jow-ordetwith truncated wavenumber l0,investigation is done of the source of intraseasonal oscillations in the extratropicalmodel atmosphere and its mechanism. Results show that (1) the convective heat transferred eastward alongthe equator serves as the source of the intraseasonal oxillation both in the tropical and the extratropical atmos--phere; (2) the velocity-potential wave of a zonal structure of wavenumber 1 gives rise to oxillation in divergentand convergent wind fields of a dipole-form as seen from the equatorial Indian Ocean to the western Pacificduring its eastward propagation, thus indicating the oscillation in the dipole-form heat soure:e/sink pattertl; (3)the tropical heat-source oscillation is responsible for the variation in phase and intensity of the extratropicalstationary wave train, and the interaction between the oscillating low-frequency inertial gravity and stationaryRossby modes that are probably mechanisms for the oscillations ip the middle-high latitudes.  相似文献   

容量法测定水样中硫酸根     

刘汉初  倪桃英 《岩矿测试》1991,10(2):123-124

本文对EDTA滴定过量Pb间接测定SO_4~(2-)的方法作了改进。加入乙醇抑制PbSO_4沉淀的溶解,使滴定不需分离沉淀而直接进行。用六次甲基四胺调节控制pH为5.2—5.4,可避免大量共存Ca~(2+)、Mg~(2+)的干扰。改进后的方法简单、快速,准确度和精密度均好,可适用SO_4~(2-)含量高于1mg/L的天然水分析。  相似文献   

新疆菁布拉克基性超基性岩带的Sm－Nd同位素年龄   总被引：7，自引：0，他引：7  

倪守斌  满发胜  陈江峰 《岩石矿物学杂志》1994,13(3):227-231

Ｓｍ－Ｎｄ矿物等时线定年结果表明，菁布拉克岩带基性超基性岩形成于３２０Ｍａ，其形成时代晚于早石炭世早期的火山活动，是塔里木板块与巩乃斯微板块碰撞晚期拉张构造环境的产物。  相似文献   

570矿床地质特征及成矿条件   总被引：2，自引：0，他引：2  

陈迪云  章邦桐 《华东地质学院学报》1994,17(3):212-218

  相似文献   

THE EFFECTS OF SEA SURFACE TEMPERATURE OVER THE EQUATORIAL WESTERN PACIFIC AND THE INDIAN OCEAN ON THE ASIAN SUMMER MONSOON   总被引：1，自引：0，他引：1  

Ni Yunqi  Qian Yongfu  Lin Yuanbi 《Acta Meteorologica Sinica》1989,3(3):375-394

In this paper,the p-σ five layer primitive equation model segmented by mountains and physical parameterizations including short wave radiation; long wave radiation; large-scale and convective condensation;heat and moisture transport from surface to the first model level is used.The horizonial resolution is 5° lat.×5° long.with the integration region from 25°S to 55°N and from 5°W eastward to 175°W.The model was spun up with perpetual June boundary conditions and forcing starting with June zonal mean heights and geostrophic wind field.In order to investigate the effects of SST (sea surface tempefuture) over the equatorial Western Pacific and the Indian Ocean on the Asian summer monsoon,four sets of numerical experments with positive anomalies over the equatorial Western Pacific,and positive and negative anomalies over the Western Indian Ocean,and zonal mean SST (the control case) are performed.The experimental results show that the South Asian low in the lower troposphere and the anticyclone over the South Asia in the uppet troposphere intensified when positive SST anomalies over the equatorial Western Pacific is included.A statistical test method for simulations is proposed.Finally,the influence mechanism of the SST anomalies over the equatorial oceans is discussed.It is worth stressing that the effects of the SST over the equatorial oceans on the Asian summer monsoon can arise as a result of interaction of SST anomalies,atmospheric flow field and heat sources and sinks in the atmosphere.  相似文献   

吉林省四季气温变化趋势和振荡周期的分析     

王惠清  倪超玉 《大气科学》1989,13(1):113-118

本文通过对吉林省四季气温时间序列的趋势分析和谱分析,揭示出吉林省夏季气温自本世纪40年代中期至70年代末处于下降趋势,80年代初又略有回升。冬季气温从30年代开始一直处于上升趋势,80年代初又略有下降。春季气温变化趋势与冬季相似,秋季基本与夏季一致。夏季气温存在18年左右显著周期,春秋季气温存在12年和2年左右周期,冬季气温存在9年左右主要周期。  相似文献   

K-Ar isotopic geochronology of Lianhuashan tungsten mining district,Guangdong Province     

Yuzhen Bai  Fasheng Man  Shoubin Ni  Tong Li 《中国地球化学学报》1985,4(1):33-40

Reported in this paper are K-Ar ages of volcanic rocks, biotite-granite and greisen from the Lianhuashan tungsten mine in Guangdong Province. The isotopic dilution method was adopted in this work. Whole-rock isochron ages of the volcanic rocks are in the range 120.4±12.1 m.y. The petrogenetic age of biotite-granite and the minero genetic age of tungsten ore are close to those of the volcanic rocks. The apparent ages of various types of rock in the mining district generally bias towards younger values, which may be attributed to the effects of late thermal events which took place in the circum-Pacific metallogenetic belt.  相似文献   

α径迹的试验研究及其与地震关系的初步探讨          下载免费PDF全文

倪明康  龙明  林思诚  李彤起 《地震工程学报》1987,9(4):39-47

本文在大量试验的基础上对α径迹法在径迹蚀刻、判定、读数方法、误差来源等方面作了讨论,並做了一些相应规定,使α径迹法在地震预报中取得了一定效果。本文还对陇西3.6级地震前α径迹法的观测结果作了讨论。  相似文献