长螺旋钻杆的磨损对钻进影响初探

通过分析钻杆过度磨损的原因和后果,从破碎功和钻杆受力两方面分析影响钻进效率的原因,提出解决问题的方法。     

同ENSO现象相关联的日长亚季节变化

本文利用小波分析方法研究了地球自转日长亚季节近50天和近120天周期变化的时频特征．结果表明,日长近120天周期变化及近50天周期变化的振幅具有明显的年际变化．ENSO事件发生之前,日长近50天周期变化加强,进入ENSO时期,逐渐减弱,成为ENSO产生的先兆之一,同时,日长近120天周期变化显著增强80年代,日长近50天周期变化明显发生了两次周期分岔分岔的一种趋势经历了一个周期延长的过程,收敛于ENSO时期增强的近120天周期变化,该过程不仅与ENSO现象相关联而且可能受到近10年波动的调制作用.同时证实了日长近120天周期变化及近50天周期变化的激发机制主要是同频段的大气环流变化所导致。     

山西大同钾镁煌斑岩地质地球化学特征

根据饮牛沟钾镁煌斑岩的岩石学、岩石化学、矿物化学、微量及稀土元素地球化学特征,本文认为该岩体属钾镁煌斑岩,但在矿物成分及化学成分上与世界上典型的含金刚石的钾镁煌斑岩相比,相对贫钛和钾,未出现含Ｋ,Ｂａ,Ｔｉ,Ｚｒ的副矿物。该岩体的成因可能为母岩部分熔融后又经分离结晶作用而形成的,岩浆起源于贫钛的金云母二辉橄榄岩,形成深度１００ｋｍ左右。     

红叶子岩金矿Ⅰ号矿化带地质及矿化特征

在以往地质工作的基础上,运用新的成矿理论及找矿思路,对矿区的地质特征及矿化特征有了新的认识。首次确认了含金石英脉带是主要的含金地质体,而含金石英脉带又受控于韧－－脆性剪切变质带,其产出状态受剪切带内的剪节理（Ｒ、Ｄ）及张节理（Ｔ）所制约,矿经强度与剪切带的变形强度及持续活动的时间和次数成正相关,从而首次确定了矿床的成因类型为含金剪切带型金矿床。     

腾冲—梁河地区斑岩地质特征及含矿性判别

腾冲－梁河地区含矿斑岩主要分布在东部花岗岩带中的构造极复杂地段,斑岩种类复杂,岩体裂隙发育,岩石破碎,岩体自蚀变和围岩蚀变强烈,蚀变种类复杂,特征副矿物和微量元素总含量高,岩体形态为岩株、岩筒、大岩脉,接触面产状陡,围岩为泥盆—二叠系碎屑岩、碳酸盐岩     

论花岗伟晶岩的成因和类型的划分

From years of experience with granite pegmatite, the authors note that granite pegmatite is of two different origins: magmatic differentiation autometasomatism and metamorphic differentiation. Granite pegmatites can be divided into nine types under four categories according to their formation mechanisms and the regularities of rare-metal evolution. Discussion is also given to the inheritance-development relationship between the various types of granite pegmatites, to the features of rare-metal mineralization and their spatial systematies of distribution.     

广西晚元古代本洞岩体同位素年代学研究

本洞花岗闪长岩体是目前在我国南方发现的一期最老的花岗岩类侵入体。对该岩体进行系统的同位素年代学研究和形成年龄的确定,无论是对我国南岭地区花岗岩的研究还是对我国南方前寒武纪地层的划分与对比都具有十分重要的意义。     

深处岩浆分异与某地花岗伟晶岩的形成

Two stages of intrusion have been recognized for Paleozoic pegmatites in this district. The pegmatites occur as several thousands of dikes, with 84 per cent of them distributed within three “thickly concentrated areas”. Similar horizontal zoning, i.e.,from the parental granite outwards the pegmatites vary from type K through type Na to type Li, is observed within these “thickly concentrated areas”, which consist of pegmatites of different stages. Temporally, the pegmatites also evolve in the same sequence of types K-Na-Li, with a series of mineralized dikes produced during this process. The occurrence of this phenomenan is not accidental but a strong indication of deepseated magmatic differentiation. In nature, not all granitic magmatism can bring about pegatite emplacement,nor all the pegmatite dikes are of the same petrological character. These differences indicate that deep-seated magmatic differentiation must be controlled by some factors.It‘s development is believed to be dependent largely on the amounts of both parental and residual magmas and on the extent to which the pressure at their source region has been lowered by the intrusion of granite. The constant movement of the crust results in the continuous upward migration of differentiated magma, so as to promote the differentiation to a greater extent, thereby providing new source materials for subsequent intrusive activity. Such a continuous movement of opposites leads to the formation of a complete series of pegmatites, i.e., from biotite-microcline pegmatite to lepidolite-albite pegmatite, giving rise to the “thickly concentrated areas” as well as a series of mineralized veins.