云南墨江猫鼻梁子金矿床金元素的物质来源探讨     

张德  高德政  赵娜 《矿产与地质》2009,23(1)

云南墨江金矿是一个大型金矿床,猫鼻梁子是其主要赋矿地段。金矿体分布于超基性岩体的围岩中。矿区各类岩浆岩中,超基性岩的含金量最高。文章应用XRD分析、扫描电镜、回归分析、线性相关分析等方法,发现了Au与Pt、Pb共生,并呈正消长关系;Au、Ag、Se的赋存关系十分密切,认为金的主要物质来源是超基性岩体。  相似文献   

Assessment of heavy metals contamination in soils of Dexing region, Jiangxi Province, China     

Cuihua CHEN Shijun NI Binbin HE Chengjiang ZHANG 《中国地球化学学报》2006,25(B08):27-28

Heavy metal contamination has attracted huge concern due to its toxicity, abundance and persistence in the environment, and subsequent accumulation in soil, sediment and water. Mining is one of the most important sources of heavy metals in the environment. Mining-milling operations and disposal of tailings （the finely ground remains of milled ores） in addition to smelting and metal refining provide significant sources of pollution. Mining and mineral processing in the Dexing region of China have been carried out for over forty years and have contaminated the soils with heavy metals, Many studies were conducted to assess and establish the extent of heavy metal contamination in the soils due to mining. The aim of this work was to assess the environmental impact of mining on soils in the Dexing region and to identify the main factors involved in heavy metals dispersion. A 4800 km^2 study area was assessed with respect to its heavy metals on the basis of the current guideline values. In order to assess the extent of heavy metals contamination resulting from past mining activities in the Dexing region, 919 soil samples were collected and analyzed for As, Hg, Cd, Cr, Zn, Cu and Pb, Heavy metals levels were determined using inductively couple plasma-atomic emission spectrometry and X-ray fluorescence spectrometry. Results of soil samples reported concentrations between 1.790-899 mg/kg for As, 0.034-4.980 mg/kg for Hg, 0.043-8.330 mg/kg for Cd, 10-666 mg/kg for Cr, 25-18500 mg/kg for Zn, 6-1825 mg/kg for Cu, and 16-1312 mg/kg for Pb, respectively. The maximum values of As, Hg, Cd, Cr, Zn, Cu and Pb concentration in soils were up to 60, 33, 41, 7, 185, 52 and 37 times higher than the tolerable level, respectively. Meanwhile, the single-factor pollution index and Nemerow pollution index were used to assess the environment quality of heavy metals contamination.  相似文献   

隐伏矿定位预测的矿田(床)构造地球化学方法     

韩润生 《地质通报》2005,(Z1)

选择有效的找矿方法实现隐伏矿定位预测是国际地学界的一大难题。通过10多年在云南会泽铅锌矿、昭通毛坪铅锌矿、易门铜矿与陕西铜厂铜金多金属矿等矿山的研究与实践,总结提出了隐伏矿定位预测的构造地球化学研究内容。在此基础上,综合了矿田(床)构造地球化学找矿方法的主要特点,认为矿床(田)构造地球化学方法是受构造控制的金属矿床隐伏矿定位预测的有效方法之一。  相似文献   

江西省德兴矿区土壤重金属污染的综合评价分析     

朱志军  聂逢君  胡青华 《华东地质学院学报》2007,30(4):332-336

在对德兴矿区可能存在重金属污染的地区进行取样、检测的基础之上,采用了不同方法对德兴矿区土壤重金属污染状况进行了评价。结果表明,德兴地区存在不同程度的砷、汞、铬、镉、锌、铜和铅重金属污染,尤其以德兴矿区为中心的区域污染最为严重。此外,乐安河中下游沿岸地区、西北方向的煤矿区均有不同程度的重金属污染。  相似文献   

Hydrothermal Alteration and Mineralization of Middle Jurassic Dexing Porphyry Cu-Mo Deposit, Southeast China   总被引：9，自引：0，他引：9  

Xiaofeng Li  Munetake Sasaki 《Resource Geology》2007,57(4):409-426

The Dexing deposit is located in a NE‐trending magmatic belt along the southeastern margin of the Yangtze Craton. It is the largest porphyry copper deposit in China, consisting of three porphyry copper orebodies of Zhushahong, Tongchang and Fujiawu from northwest to southeast. It contains 1168 Mt of ores with 0.5% Cu and 0.01% Mo. The Dexing deposit is hosted by Middle Jurassic granodiorite porphyries and pelitic schist of Proterozoic age. The Tongchang granodiorite porphyry has a medium K cal‐alkaline series, with medium K₂O content (1.94–2.07 wt%), and low K₂O/(Na₂O + K₂O) (0.33–0.84) ratios. They have high large‐ion lithophile elements, high light rare‐earth elements, and low high‐field‐strength elements. The hydrothermal alteration at Tongchang is divided into four alteration mineral assemblages and related vein systems. They are early K‐feldspar alteration and A vein; transitional (chlorite + illite) alteration and B vein; late phyllic (quartz + muscovite) alteration and D vein; and latest carbonate, sulfate and oxide alteration and hematite veins. Primary fluid inclusions in quartz from phyllic alteration assemblage include liquid‐rich (type 1), vapor‐rich (type 2) and halite‐bearing ones (type 3). These provide trapping pressures of 20–400 ´ 10⁵ Pa of fluids responsible for the formation of D veins. Igneous biotite from least altered granochiorite porphyry and hydrothermal muscovite in mineralized granodiorite porphyry possess δ¹⁸O and δD values of 4.6‰ and ?87‰ for biotite and 7.1–8.9‰, ?71 to ?73‰ for muscovite. Stable isotopic composition of the hydrothermal water suggests a magmatic origin. The carbon and oxygen isotope for hydrothermal calcite are ?4.8 to ?6.2‰ and 6.8–18.8‰, respectively. The δ³⁴S of pyrite in quartz vein ranges from ?0.1 to 3‰, whereas δ³⁴S for chalcopyrite in calcite veins ranges from 4 to 5‰. These are similar to the results of previous studies, and suggest a magmatic origin for sulfur. Results from alteration assemblages and vein system observation, as well as geochemical, fluid inclusion, stable isotope studies indicate that the involvement of hydrothermal fluids exsolved from a crystallizing melt are responsible for the formation of Tongchang porphyry Cu‐Mo orebodies in Dexing porphyry deposit.  相似文献   

江西德兴铜金矿集区成矿规律   总被引：1，自引：0，他引：1  

邓国萍 《矿产与地质》2001,15(Z1):400-403

德兴矿集区铜金成矿受地层、岩性、岩浆活动、构造等多种因素的控制,通过对控矿作用的研究,指出了矿集区铜金成矿的基本规律.  相似文献   

江西德兴斑岩铜矿床扩散和渗滤作用理想模式分析     

唐元骏 《地球科学》1985,(2)

文章从介绍扩散和渗滤作用一般概念着手,根据德兴铜厂斑岩铜矿床之细矿脉形成过程中元素自矿脉向围岩发生迁移的这一事实,应用扩展的一维费克定律来模拟这一真实过程。并讨论了铜厂铜矿床形成过程中离子、络离子具线性等温线的纯扩散、纯渗滤和扩散与渗滤重叠情况,以及非线性等温线的纯扩散作用。  相似文献   

山东乳山蓬家夼金矿矿体变化特征及深部成矿预测   总被引：15，自引：2，他引：13  

杨金中  沈远超  李光明  刘铁兵  谢宏远 《大地构造与成矿学》1999,23(2):160-166

蓬家夼金矿是山东乳山地区新发现的金矿类型,受荆山群中的层间滑动角砾岩系控制,沿胶莱盆地边缘莱阳组砾岩与荆山群副变质岩的构造接触带分布。矿体严格受层间滑动构造控制。在横、纵剖面上均呈连续的透镜状,每５０～１５０ｍ出现一次膨缩。矿体厚大部位产于层间滑动断层产状由陡（４５°～５０°）变缓（１５°～２０°）处。在上述认识的基础上,结合物化探方法,我们对蓬家夼金矿Ⅰ号矿体成功进行了预测。  相似文献   

数字地质调查系统在赛什塘铜矿区的应用     

夏正清  朱谷昌  张普斌  丁天柱 《矿产与地质》2008,22(6):556-561

由中国地质调查局下属的发展研究中心开发的数字地质调查系统主要应用于固体矿山,其目的旨在帮助地质人员实现从矿产资源野外调查到地质成图、矿体圈定、矿床建模、储量估算、报告生成全过程的数字化。本文应用该系统的矿产资源调查野外数据采集子系统,成功实现了对赛什塘铜矿区数十年地质资料（包括槽探、坑探、钻探）的方便快捷的管理,通过固体矿产勘查储量估算子系统实现对矿区部分矿体的三维显示、储量估算和储量报告的生成。  相似文献   

斑岩型铜矿床成矿过程中铜的迁移与沉淀机制研究新进展   总被引：9，自引：0，他引：9  

金章东  李福春 《矿产与地质》1998,12(2):73-78

作为主要铜源的斑岩型铜矿床一直是研究、生产部门关注的热点。依据多年研究成果和大量文献资料,并以德兴斑岩铜矿研究新成果为实例,综述了斑岩铜矿矿质迁移沉淀机制研究的新进展,包括铜的迁移形式和演化,流体演化对铜络合物作用,铜在熔体相、流体相和晶体相配分以及铜居留场所和形式等。  相似文献