与碱性花岗岩有关的稀有稀土矿床   总被引：2，自引：0，他引：2  

林德松 《矿产与地质》1994,8(6):401-406

概述了含矿碱性花岗岩产出的地质背景，含矿岩体的主要特征。根据岩石中暗色矿物与主要成矿元素的关系，将碱性花岗岩矿床划分为３种矿化类型：含Ｎｂ（Ｓｎ）黑云母花岗岩；含Ｎｂ（Ｓｎ）、ＨＲＥＥ钠铁闪石－钠闪石花岗岩；含ＬＲＥＥ霓石花岗岩，并指出，碱性花岗岩矿床在我国北部边区和攀西裂谷带具有良好的成矿前景。  相似文献   

华南沿海老红砂的成因与红化作用   总被引：17，自引：0，他引：17  

吴正  黄山 《地理学报》1994,49(4):298-306,T001

根据野外调查和室内实验分析，以及测年数据，本文讨论了华南沿海老红砂的成因、年龄与形成环境。认为老红砂是晚更新世末次冰期海岸风沙堆积，红色特征与亚间冰期的温暖古气候有关。在湿热气候下，古风成砂中含铁硅酸盐矿物氧化生成赤铁矿，而使无色石英沙粒染成红色，是其红化的主要机制。风成砂形成红色的时间不超过１万年。  相似文献   

The Evolutionary History of Ore-forming Processes of Metallic Ore Deposits in Northern Guangxi1     

Chen Yuchuan  Mao Jinwen  Wang Ping'an 《《地质学报》英文版》1995,8(2):155-170

Abstract The northern Guangxi region is an important rare metal, rare earth metal and polymetallic metallogenic province. In the region there exist five metallogenic series and two metallogenic subseries, whose metallogenesis shows features of polycyclic spiral evolution throughout the geological history. As far as various cycles are concerned, mantle-derived ore substances were reduced while crust-derived ore substances increased from early to late times; in the whole geological evolutionary history, mantle-derived substances decreased gradually while crust-derived ones increased. Meanwhile ore element associations became more and more varied. In terms of space, mineralization migrated from the old basement outwards, i.e. from west to east during the Precambrian, and from north to south during the Phanerozoic, and again from east to west during the Yanshanian.  相似文献   

辉碲铋矿单矿物的化学分析   总被引：1，自引：1，他引：1  

郑大中  郑若锋 《岩矿测试》1995,14(4):250-253

辉碲铋矿物经ＨＮＯ３－ＫＣｌＯ３溶解，用火焰原子吸收法或乙二胺四乙酸二钠事滴定法测定Ｂｉ，火焰原子吸收法测定Ｔｅ、Ｆｅ、Ｃｕ，３，３＇－二氨基联苯胺光度法测定Ｓｅ，硫酸重量法测定Ｓ。其结果与矿物化学成分理论值十分接近，主、次量元素平行测定６次，其ＲＳＤ小于０．８％，痕量元素ＲＳＤ（ｎ＝６）小于１０％。  相似文献   

断裂带的韧-脆性转化与成矿   总被引：1，自引：0，他引：1  

彭恩生 《地球物理学进展》1993,(4)

根据河南西部绿岩型脉状金矿的一些地质现象,探讨了韧性剪切带转化为脆性断裂的机制.韧性剪切过程岩石的面理化为矿液参与断裂作用,增加流体压力创造了条件.流体压力的增加一方面可以改变断裂的力学性质;另一方面可以压裂围岩,促进断裂韧-脆性转化,为脉状矿床的形成创造了条件.  相似文献   

Negative Haloes and Geochemical Field Systems of Hydrothermal Deposits1     

Ji Kejian  Wang Liben  Lu Fengxiang  Wang Wuyi  Zhang Jianhua 《《地质学报》英文版》1993,6(2):195-209

Abstract Primary haloes of hydrothermal deposits were previously considered as positive haloes. Although it has been recently suggested that primary haloes incude positive and negative ones, almost all the research work on primary haloes has still focused on positive haloes for various reasons. In order to understand the source of ore substances a number of large hydrothermal deposits related to magmatism including porphyry, skarn and vein type deposits have been studied. It has been found that negative haloes exist on the peripheries of positive haloes of a mineral deposit. On the basis of the study the authors propose the concept of the geochemical field system of ore-forming elements of hydrothermal deposits, i. e., with the orebody as the centre outwards there occur the mineralized field, positive halo field, depleted field and background field successively.  相似文献   

伊通县放牛沟地区早古生代岩浆演化特征及其与矿产关系   总被引：1，自引：0，他引：1  

贾大成 《吉林地质》1990,9(2):49-56

伊通县放牛沟早古生代岩浆活动较为强烈,其发展演化与放牛沟多金属硫化物矿床关系极为密切。岩浆活动特点是先喷发后侵入,先期形成钙碱系列的火山—沉积岩系,后期为Ⅰ型中酸性岩浆侵入。该矿床既有火山沉积特征,又有后期岩浆热动力改造特点,其形成受控于岛弧构造环境、火山活动形成的矿源层、后期热动力改造等因素。  相似文献   

吉林省夹皮沟金矿地质特征及成因探讨   总被引：4，自引：0，他引：4  

蒋荣清  戴新义 《吉林地质》1990,9(4):19-26

夹皮沟金矿产于晚太古宙绿岩带的下部层位。北西向的韧性剪切带控制着金矿田和矿床分布,而矿体主要受叠加于韧性剪切带之上的脆性断裂构造制约。金主要来源于围岩。华力西晚期—燕山早期为主要成矿期。属多源、多期的叠生型金矿床。  相似文献   

570矿床控制因素及富矿形成条件   总被引：2，自引：0，他引：2  

王玉生  李文君  郑胜昌  杨云飞  黄忠庚 《铀矿地质》1990,(1)

570矿床地质背景是破火山旋回边缘活动带;矿床定位要素是受破火山断裂系统构造结控制的隐爆角砾岩筒;隐爆加断陷组成的聚矿结构,是富矿形成的主要条件;隐爆角砾岩筒与次火山花岗岩浆侵位组成的热泵汲取效应,是矿床基本成因模式。矿床扩大方向是在探索隐爆角砾岩筒深部的同时,沿边缘活动带,在破火山断裂系统构造结处寻找新的隐爆角砾岩筒。  相似文献   

Influence of local geological conditions on the macroseismic effects in the town of Strazhitza     

D. Michailov  R. Glavcheva  S. Dineva  S. Elenkov  B. Konstantinov 《Natural Hazards》1990,3(2):153-160

Damage caused by the earthquake of 7 December 1986 (M = 5.7) and its aftershocks in low-storey residential buildings in the town of Strazhitza, Bulgaria, situated in the epicentral zone are systematized. A scale of damages is compiled for two types of buildings which is coordinated with the MSK-64 scale. The territorial distribution of the seismic intensity is compared with the results of the detailed engineering-geological study. A correlation between the Quarternary deposit thickness and the observed seismic intensity is obtained.Paper presented at the 21st general assembly of the European Seismological Commission held in Sofia, 1988.  相似文献