河南前河金矿岩石矿物特征   总被引：6，自引：1，他引：6  

裴玉华  严海麒  张明云 《矿产与地质》2006,20(4):513-518

前河金矿属构造蚀变岩型。容矿岩石为正长斑岩，矿体大小不等，控矿破碎带内的岩石曾经受到早期塑性变形和晚期脆性变形两个阶段。容矿岩石及矿体围岩曾受多次热液蚀变作用，可分为三个成矿期：岩浆热液期、表生期和沉积期。岩浆热液期为最主要的成矿期，由四个矿化阶段组成。一种富铁黄铜矿在金矿石中广泛存在，可作为金矿石的指示矿物。  相似文献   

郯庐断裂带南段沙溪含铜斑岩体的40Ar/39Ar年代学研究及意义   总被引：8，自引：0，他引：8  

杨晓勇 《矿物岩石》2006,26(2):52-56

对郯庐断裂南段沙溪含铜斑岩体中黑云母和斜长石单矿物的高精度40A r/39A r同位素测定,获得40A r/39A r平均坪年龄为132.62 M a±0.28 M a,40A r/39A r等时线平均年龄为132.59 M a±0.46 M a,而最小平均视年龄86 M a左右可能表示后期的一次热事件,可能对应于斑岩体与Cu-A u矿化有关的热液活动。这些年龄值比前人在该区及邻区获得的K-A r和R b-S r年龄更精确地代表沙溪含铜斑岩体的侵入时代。132.6M a左右的年龄代表着该区含铜(金)斑岩体的侵入时代,可以证实铜(金)斑岩型矿床是在稍后的大规模热液蚀变条件下所形成。  相似文献   

花岗岩型热液铀矿床C,O同位素研究 ——以粤北下庄铀矿田为例   总被引：3，自引：0，他引：3  

商朋强  胡瑞忠  毕献武  刘雷  张国全 《矿物岩石》2006,26(3):71-76

下庄矿田是华南重要的热液铀矿产区,区内控矿条件复杂。研究选取下庄矿田部分矿床内热液碳酸盐样品并测定其C,O同位素组成:测定矿田北部的1δ3CPDB为-7.6‰~-8.4‰,1δ8CSMOW为12.1‰~13.2‰,而矿田南部测波动范围较大1δ3CPDB则为-3.1‰~-8.5‰,δOSMOW为10.4‰~14.1‰。进一步研究结果表明,成矿流体中矿化剂ΣCO2主要来源于中新生代与区域深大断裂有关的幔源脱气作用,同时伴有壳源有机碳来源;成矿同时期伴随的强烈流体脱气(CO2)作用对矿质沉淀至关重要。  相似文献   

粤北下庄铀矿田碳、氧同位素研究     

商朋强  胡瑞忠  毕献武  刘雷  张国全 《矿物岩石地球化学通报》2006,25(Z1):181-183

下庄矿田是华南重要的热液铀矿产区,区内控矿条件复杂.本文选取下庄矿田部分矿床内热液碳酸盐样品并测定其碳、氧同位素组成,测得与成矿有关的碳酸盐的δ13CPDB值为-3.1‰～-8.8‰.研究结果表明,成矿流体中矿化剂∑CO2主要来源于中新生代与区域深大断裂有关的幔源脱气作用,同时伴有壳源有机碳来源;成矿同时期伴随的强烈流体脱气(CO2)作用对矿质沉淀至关重要.  相似文献   

长城堡岩体西段放射性水文地质特征及其找矿方向     

董光国  戴永久 《铀矿地质》2006,22(2):104-109,128

文章论述了长城堡岩体西段放射性水文地质特征、水化学异常特征和铀矿化特征，探讨了三者之问的相关关系；指出该区铀矿化受水化学异常区和水文地球化学垂直分带的控制，铀主要富集在氧化-还原过渡带；根据该区铀易浸出的特点，认为适合于用溶浸和地浸法开采。  相似文献   

河北围场发现金多金属成矿带     

徐桂林  孟庆芳 《河北地质》2006,(2):32-32

河北围场朝阳湾金矿，1：1万地质填图发现金矿点20处、矿化点40处。金矿最高品位达每吨18克。  相似文献   

Six thousand years of records of metal mining and utilization from lake sediments in central China     

Celine S.L. Lee Shihua QI Gan Zhang Xiangdong LI 《中国地球化学学报》2006,25(B08):20-20

A sediment core from the Liangzhi Lake, Hubei Province in central China, was used to assess metal usage and accumulation in the past 6000＋ years in China. The concentrations of trace metals, including Cr, Cu, Pb, Ni and Zn, and major elements, Ca, Fe and Mg, in the ^14C-dated sediment core were analyzed. Historical trends of metal inputs to the Liangzhi Lake from 5000 B.C. to the present were recorded in the sediments, representing over 6000 years of metal mining and utilization history in China. The concentrations of Cu, Ni, Pb and Zn have increased gradually since 3000 B.C., indicating the start of the Bronze Age era in ancient China, until the period 467-76 B.C. During the period of 467-76 B.C., there had been a rapid increase in the concentrations of these metals in the sediments, indicating the enormous inputs of these metals at that time. This era corresponded well with the Warring States Period （475-221 B.C.） and early Hart Dynasty （206 B.C.-220 A.D.） of China, during which copper and lead were extensively used in making bronze articles, such as vessels, tools and weapons. During 1876 A.D. to the early 1900s, there was also a significant increase in the metal concentrations, such as Cu, Ni and Pb, which could probably reflect the impact of metal emissions during the early industrial development and wars in China. The Pb isotopic analysis showed that the surface and subsurface sediments had lower ^206Pb/^207Pb, and ^208Pb/^207Pb ratios than the deeper layers, affected by mining activities both during the Bronze Age era and modem times.  相似文献   

Classification of Magmatic Sulphide Deposits in China and Mineralization of Small Intrusions     

TANG Zhongli YAN Haiqing JIAO Jiangang LI Xiaohu 《《地质学报》英文版》2006,80(3):412-419

Many important metal resources, such as Ni （Cu, Co）, PGE, exist in magmatic sulfide deposits, are a hot spot in geological research. We divide the magmatic sulphide deposits in China into four types according to their tectonic setting, intruding mode, ore deposit mode, main metallogenic elements. The four types are as follows： （1） Small-intrusion deposits in paleo-continent; （2） Smallintrusion deposits in continental flood basalt; （3） Small-intrusion deposits in orogenic belt; and （4） The deposits associated with ophiolites. On the basis of the classification, we put forward that the main magmatic metallogenic type in China is small-intrusion metallogeny, and describe its characteristics from small intrusions related concept, three geologic settings, three volcanic-intrusive assemblages and metallogenic key factors. According to the experiences of prospecting at home and abroad, we point out that there is big potential in prospecting small-intrusion deposits, which need further study. At last, we indicate that small-intrusion metallogeny not only widely distributes in mafic-ultramafic intrusions, but also has an important economic value and scientific significance in intermediate-acid intrusions.  相似文献   

四川盐源马丝螺地区1：5万水系沉积物测量成果及金矿找矿方向     

王仁宗 《四川地质学报》2006,26(4):218-222

阐述了盐源马丝螺地区破碎带中金矿(化)体特征,结合该地区1:5万水系沉积物测量所圈定的组合异常特征、成矿元素地球化学特征,提出了该地区的找矿标志,指出了找矿方向。  相似文献   

西藏西南部拉昂错和东坡蛇绿岩体中新发现铬铁矿化点     

黄圭成  徐德明  雷义均 《华南地质与矿产》2006,(3):82-82

"西藏雅鲁藏布江西段铬铁矿资源远景调查"是我所承担的矿产资源评价项目.项目组在2003~2005年开展野外调查工作中,在西藏普兰县拉昂错蛇绿岩体和札达县东坡蛇绿岩体内新发现了铬铁矿化,找矿工作取得重要的进展.经初步研究,区内铬铁矿属于典型的豆荚状铬铁矿,其含矿岩体与国内外同类大型铬铁矿床的含矿岩体特征相似,岩体规模大,由方辉橄榄岩和纯橄榄岩组成,具有岩相分带,显示出较好的成矿前景.  相似文献