Multi-episode fluid boiling in the Shizishan copper-gold deposit at Tongling, Anhui Province: its bearing on ore formation   总被引：12，自引：0，他引：12  

XIAO Xinjian  GU Lianxing  NI Pei 《中国科学D辑(英文版)》2002,45(1):34-44

The Shizishan copper-gold deposit at Tongling, Anhui Province consists of two magmato-hydrothermal mineralization types: the crypto-explosive breccia type and the skarn type. At least four episodes of boiling occurred to the ore-forming fluids in this deposit. The first episode took place in accompany with the formation of the crypto-explosive breccias. The melt-fluid inclusions giving temperatures above 600℃ and salinities higher than 42% NaCl equiv represent a residual magma related to this episode. The second episode occurred during skarnization, giving fluid temperatures of 422℃-472℃, averaging 458℃, and salinities of 10.2%-45.1% NaCl equiv. The third episode corresponds to the main mineralization stage, i.e., the quartz-sulphide stage. Fluid temperatures of this episode vary in a range of 337℃-439℃ with an average of 390℃, and salinities in a range of 3%-30% NaCl equiv. The forth episode happened at the waning stage of mineralization, giving fluid temperatures below 350℃ with an average of 265℃ and salinities of 2.1%-40.4% NaCl equiv.  相似文献   

矿产预测专家系统及其在新疆铜—镍硫化物矿床中的应用     

肖树建  武润亭 《地质论评》1997,43(2):210-216

系统地使用综合地质，地球物理、地球化学信息预测深部岩浆铜－镍硫化物矿床的找矿预测专家系统，已在新疆哈密地区香山岩体上就用并取得明显效果，设计的两个验证钻孔都已打到矿体。  相似文献   

辽宁红透山块状硫化物矿床中沉积磁黄铁矿的变质和流体作用   总被引：4，自引：0，他引：4       下载免费PDF全文

顾连兴  肖新建  倪培  吴昌志 《地质论评》2001,47(2):188-192

辽宁红透山太古宙块状硫化物型铜-锌矿床经历过高角闪岩相变质作用。矿石结构研究表明,矿床中的磁黄铁矿主要是海底喷流沉积后受到变质退火和重结晶的产物。在进变质过程中形成的磁黄铁矿的变形结构绝大部分已被峰期变质作用所清除,目前所见到的变形结构和矿石糜棱岩主要是退变质阶段的产物。流体的存在促进了磁黄铁矿的变形和退火。退变质流体以较高的氧逸度为特征。  相似文献   

喀拉通克1号铜镍硫化物矿床研究   总被引：4，自引：0，他引：4  

赵昌龙 《新疆地质》1991,(3)

本文通过大量的测试研究.对喀拉通克1号铜镍硫化物矿床的围岩、构造、岩石矿物,矿石及同位素地质等特征进行了详细的阐述.该矿是由上地幔亚碱性拉斑玄武岩浆经中间岩浆房液态层状分异后,侵位于活动区,其中的含矿岩浆就地熔离成矿,同源矿浆贯入成矿,以及它们复合定位所形成的岩浆熔离叠生矿床.并建立起该矿床的成岩成矿模式.  相似文献   

The impact of reed-protecting structures on littoral zones     

Hardy Rolletschek   《Limnologica》1999,29(1):86-92

The impact of several types of reed-protecting structures on hydrodynamic conditions, sediment properties and littoral water quality were investigated. All types of embankment lead to a dissipation of wave energy. The embankment with fagots (type 1) shows a limited porosity in contrast to the other types examined. All kinds of embankment enhance the accumulation of organic matter at the land/water-interface. Hence, they protect littoral accumulation zones from erosion. The embankment with fagots causes changes in sediment properties at the seaward side of reed belts. The surface of mineral sediments is turned into a fine-grained mud, with a high content of organic matter. Accelerated sedimentary microbial processes (oxygen demand) are produced by increasing nutrient availability (carbon, nitrogen). As a result, the O₂-saturation of water bodies is significantly reduced. This is in contrast to the embankment with wooden partitions and palisades (type 2 and 3), which had no significant effects on sediment conditions and water quality. The consequences of changes in type 1-protected reed stands are discussed. Practical recommendations are given for the further use of reed-protecting structures.  相似文献   

Images of concentrations of dissolved sulphide in the sediment of a lake and implications for internal sulphur cycling   总被引：1，自引：0，他引：1  

Christine Lehmann  & Reinhard Bachofen 《Sedimentology》1999,46(3):537-544

The high-resolution mapping of dissolved sulphide in modern sediment of a permanently stratified (meromictic) lake is possible using a novel sulphide imaging technique (called a 'sulphur print'). The technique is simple, easy to use and can map a relatively large area (up to several dm²). In situ sulphur prints from anoxic fine-grained sediments are able to reveal internal structures in apparently homogeneous materials. Sulphur prints have been used to examine the formation and distribution of dissolved sulphide in the sediment and water column of the meromictic Lake Cadagno (southern Switzerland). The prints show clearly that a previously unknown laminar convective flow of sulphide-free porewater occurs across the sediment–water interface. Such convective flow out of the sediment must be accompanied by convective flow of sulphide- and sulphate-rich lake water into the sediment, and may be an important mechanism for the accumulation of sulphur in the sediment.  相似文献   

Chalcopyrite Intergrowths in sphalerite in the Meixian Lead—Zine Deposit,Fujian Province and their Metallogenic Significance   总被引：2，自引：0，他引：2  

顾连兴  周兵等 《中国地球化学学报》1998,17(4):311-319

Ore textures and electron microprobe analyses show that in addition to highly scattered blebs in sphalerite grains,intergrown chalcopyrite also occurs as rods,myrmekites and lamellae aligned along cleavages and twin boundaries of the host sphalerite.The majority of the intergrowths could have been formed by replacement of sphalerite by chalcopyrite,albeit part of them may have resulted from exsolution,Not only copper,but also iron were introduced into the sphalerite by replacive fluids.While the front of the replacing fluid was moving forward through a sulphide orebody,Zn and Pb were dissolved and Cu was precipitated,resulting in zonal refining of the sulphide ores,The remobilized zinc and lead were precipitated at favourable sites with changed physico-chemical conditions .This is a possible mechanism for the formation of copper-poor zinc and lead ores above or lateral to the copper orebodies in some of the massive sulphide deposits reworked and overprinted by late-stage granites and their hydrothermal fluids.  相似文献   

Biogeochemical exploration for massive sulphide deposits in areas of dense vegetation: an orientation survey around the Kanköy Deposit (Trabzon, northeastern Turkey)     

M Akçay  A Lerm?  A Van 《Journal of Geochemical Exploration》1998,63(3):173-187

The eastern Pontides region is a mountainous terrain favourable for massive sulphide deposits. Besides the known deposits, it is highly likely that there are others to be discovered. This paper, therefore, describes the results of a soil and biogeochemical sampling program to assess the suitability of biogeochemical methods for the exploration of hidden deposits in temperate terrains. Soil sampling in the Pontides is shown to be a reliable follow-up method. It produced a significant geochemical response characterised by extensive Cu and Zn but localised Pb anomalies. Lead therefore is the element which can be used to pinpoint the mineralisation due to its relatively less mobile character. Hydromorphic dispersion enhanced the anomalies indicating that base of slope samples would produce reliable results. Of the plant species sampled, Corylus avellana (hazelnut tree) with deep penetrating roots shows comparable results to soil sampling and could be used to delineate the mineralisation. Rhododendron luteum may also be of help. In both species Pb shows limited dispersion and accumulates in the plants near the mineralised site whereas Cu and Zn tend to move away downslope. This shows that biogeochemical sampling could, with proper attention to species selection, be successfully used as an alternative method in the search of massive sulphide deposits in mountainous terrains with a high rainfall such as the eastern Pontides.  相似文献   

冀中晋县凹陷区地表地球化学勘查研究   总被引：5，自引：0，他引：5       下载免费PDF全文

祁士华  邱毅 《地球科学》1998,23(1):103-106

冀中晋县凹陷内汪气藏高原含经氢组分,硫化氢既对油田开采产生危害及又是硫的一种特殊资源,查明该区石油及硫化氢的分布和贮量为安全开发区资源是非常得要的,介绍了在该区开展的地表地球化学勘探方法,通过对地表土壤中硫化氢和硫酸烃等地球化学指标的研究明了本区油气藏的分布和硫化氢的分布。  相似文献   

伊比利亚型——一种新类型块状硫化物矿床地质地球化学及成因   总被引：3，自引：0，他引：3  

于际民  蒋少涌 《地质找矿论丛》2000,15(3):246-253

块状硫化物矿床主要有两种类型：火山岩容矿型（如日本黑矿）和沉积岩容矿型（如加拿大苏利文矿床）。近年来,在西班牙和葡萄牙的伊比利亚区发现了一条长２５０ｋｍ,宽２５～７０ｋｍ的黄铁矿带,其中产有若干世界级的超大型锡多金属块状硫化物矿床。根据对这些矿床的地质特征、成矿流体包裹体、Ｈ、Ｏ、Ｓ、Ｐｂ同位素及成矿环境和成矿模式的研究表明,它们具有明显不同于火山岩深矿型沉积岩容矿型块状硫化物矿床的特征,而一种新  相似文献