鲁中碳酸岩中磷灰石同位素地球化学研究   总被引：6，自引：0，他引：6  

储同庆  沈渭洲 《矿物学报》1997,(1)

鲁中地区分布着100多个碳酸岩体，微量元素含量及稀土配分等均与世界典型碳酸岩相近。而碳酸岩的碳氧及斑晶磷灰石的锶、钛同位素组成与典型地幔物质有差异，与富集地幔颇为近似，从而证实在山东地区陆壳下存在富集地幔源区。  相似文献   

辽北－吉南地区太古宙花岗岩－绿岩带地质地球化学   总被引：9，自引：0，他引：9  

李俊建  沈保丰  李双保  毛德宝  骆辉  金文山 《地球化学》1996,(5)

辽北－吉南地区是我国典型太古宙花岗岩－绿岩带出露区之一。根据其地质地球化学特征，本区绿岩带可划分为清原型和夹皮沟型，其形成的古构造环境分别为与现代岛弧的大陆边缘活动带和弧后盆地或大陆边缘裂谷相类似的裂谷型构造环境。与绿岩带有关的花岗质岩石可划分为三类：即片麻状花岗质杂岩体、花岗闪长岩和英云闪长岩底辟岩基以及钾质花岗岩。花岗岩－绿岩带的形成时代为２．５－２．９Ｇａ。  相似文献   

陕西镇安丘岭微细浸染型金矿床同位素组成特征及成因意义   总被引：2，自引：0，他引：2  

申萍 《地质找矿论丛》1996,11(4):27-34

本文通过硫、氢、氧、碳、铅同位素组成的研究，认为成矿溶液来自大气降水，成矿物质来自南羊山组和袁家沟组的不纯细碎屑岩－碳酸盐岩。在此基础上分析了成矿过程。  相似文献   

岩背斑岩锡矿特征和成因   总被引：6，自引：0，他引：6  

沈渭洲  王德滋 《高校地质学报》1996,2(1):85-91

冉背斑岩锡矿为Ｓｎ－Ｆ型，不同于玻利维亚斑岩锡矿（Ｓｎ－Ｂ型）。含矿的火山－侵入杂岩属陆壳重熔型（Ｓ型）。矿体赋存于流纹斑岩和花岗斑岩的内外接触带，物质成分较为复杂；围岩蚀变的分带现象较明显，自内向外依次为黄英岩化带、绿泥石化带和绢云母化带。根据同位素资料，成矿热液以岩浆水为主，成矿物质主要来自岩浆。成矿作用在时间、空间和物质来源上与岩浆活动有着密切的成因联系。  相似文献   

珍珠陶石的夹层化合物法鉴定   总被引：1，自引：0，他引：1  

沈忠悦  叶瑛 《矿物学报》1996,16(1):89-91

应用联氨、使珍珠陶石形成其夹层物，然后再用水洗获是水合珍珠陶石，这种水合珍珠陶石具有十分特征的０．８３５ｎｍＸ射线衍射峰，而高岭石族的其它矿物却保持不变，利用这一明显的特征，可以容易地区分出混合在高岭石中的少量珍珠陶石。  相似文献   

矿物英文名称的含意解析     

沈守文 《矿物学报》1996,16(1):92-96

许多矿物中文名称与英文名称的含意不一致，为了正确理解矿物的英文名称，本文介绍了３１０个常见矿物和重要矿物的英文名称的含意。  相似文献   

Heavy metals pollution on the sediments in lakes Dianchi, Erhai and Poyanghu and historical records     

Xiumei Zhang  Shen Zhang  Weimin Ying  Tianshan Ren  Cuihua Xu  Zhizhao Zhong  Shurong Zhang 《GeoJournal》1996,40(1-2):201-208

In this paper²¹⁰ Pb and ¹³⁷Cs dating methods were used to determine sedimentation rates of lakes Dianchi, Erhai and Poyanghu, and to establish the time scale of the sediments. Also based on geochemical records in the sediment column, the historical variation in heavy metal content over the past one hundred years was determined. Some element concentration increased rapidly after the 1970s, such as Cu, Zn and Mn in the sediments of northern Lake Dianchi, Cd and Mn in southern Lake Erhai and in the west central parts of Lake Poyanghu, Our investigations indicate that the increase in element concentration is caused by human activities. In order to understand the extent of the effect caused by human activities, we have calculated the flux of Zn, Cd and Mn. Results show that the flux caused by human activities is seven times greater than the natural one and the ratio is about 2 times in Lake Erhai and Lake Poyanghu.  相似文献   

计算样本相似性在油气预测中的应用     

朱晓军  申宁华 《世界地质》1996,15(2):87-91

介绍了计算样本相似性方法在油气预测中的应用的基本原理和技术。提出了利用参数的显著性进行参数优化和加权的方法。该方法简单、实用，并在塔北某区的应用取得了满意结果。由此证明了该方法的有效性及在综合信息预测工作中进行参数优化和加权工作的重要性。  相似文献   

多金属结核的沉积物地球化学场     

杨慧宁  陈永志  沈桂梅 《岩石矿物学杂志》1996,15(4):307-315

远洋沉积物是多金属结核赖以生长的场所，本文系统地研究了沉积物中主要成矿元素水成组分在不同地球化学场和不同沉积阶段的地球化学特征，以及水成组分的含量比与成矿作用的相互关系。研究表明，Ｍｎ、Ｆｅ、Ｃｏ、Ｎｉ、Ｃｕ都是一些比较活泼的元素，它们共处于多金属结核、沉积物和大洋水的统一体系中，当结核形成时，Ｍｎ、Ｆｅ、Ｎｉ、Ｃｕ在结核与沉积物中的含量呈负相关，而Ｃｏ含量呈正相关。研究区东部结核以富含Ｍｎ、Ｎｉ、Ｃｕ贫Ｆｅ、Ｃｏ为特征，其伴生沉积物相对贫Ｍｎ、Ｎｉ、Ｃｕ、Ｃｏ，而富Ｆｅ，可称之为贫化的地球化学场。研究区西部结核富含Ｆｅ、Ｃｏ而贫Ｍｎ、Ｎｉ、Ｃｕ，其伴生沉积物则相应贫Ｆｅ，而富Ｍｎ、Ｎｉ、Ｃｕ、和Ｃｏ，可称之为富化的地球化学场。可以看出，贫化的沉积物地球化学场，恰恰是寻找富矿结核的最佳场所。早中新世以来的沉积物，根据水成组分的含量或含量比，也可相应于结核的形成分为三大沉积阶段，其中的第Ⅱ阶段具有贫化的地球化学特征，是多金属结核形成的最有利时期  相似文献   

A Study on the Geological—Geochemical Dynamics of Hydrothermal Ore Deposition as Exemplified by the Muping—Rushan Gold Deposit Belt,Eastern Shandong,China     

赵伦山  高太忠等 《中国地球化学学报》1996,15(4):289-295

This paper presents a method of establishing a hydrothermal ore-forming reaction system.On the basis of the study of four typical hydrothermal deposits,the following conclusions concerning geochemical dynamic controlling during hydrothermal mineralization have been sions concerning geochemical dynaamic controlling during hydrothermal mineralization have been drawn:(1)The regional tectonic activities control the concentration and dispersion of elements in the ore-forming process in terms of their effects on the thermodynamic nature and conditions of the ore-forming reaction system.(2)During hydrothermal mineralization the activites of ore-bearing faults can be divideb into two stages:the brittle splitting stage and the brittle-tough tensing stage,which would create characteristically different geodynamic conditions for the geochemical thermodynamic ore-forming system.(3)The hydrothermal ore-forming reaaction system is an open dynamic system.At the brittle splitting stage the system was so strongly supersaturated and unequilibrated as to speed up and enhance the crystallization and differentiation of ore-forming fluids.And at the brittle-tough tensing stage,the ore-forming system was in a weak supersaturated state;with decreasing temperature and pressure the crystallization of oreforming material would show down,and it can be regarded as an equilibrated state.(4)In the lates stages of hydrothermal evolution,gold would be concentrated in the residual ore-forming solution.The pulsating fracture activite in this stage led to the crush of pyrite ore and it was then filled with gold-enriched solution,forming high-grage“fissure”gold ore.This ore-forming process could be called the coupling mechanism of ore formation.  相似文献