高村金矿床11^-1矿体富矿段地质特征及成因          下载免费PDF全文

陆品义 《地质找矿论丛》2002,17(2):92-96

通过对河台金矿高村矿床11^-1矿体富矿段的富集特征及赋存状况的研究，分析了富矿段的形成与构造，重熔花岗岩，成矿热液之间的关系，阐明了富矿段的成因及经济意义，同时指出与主矿体平行侧列的小矿体的探矿方向。  相似文献   

深源富碱硅热流体与斑岩铜矿含矿斑岩体的成因联系及流体包裹体、斑晶结构证据   总被引：6，自引：0，他引：6  

陈文明 《地学前缘》2001,8(4):409-421

通过中国几个主要斑岩铜矿含矿斑岩体中斑晶结构及斑晶中流体包裹体的详细研究得出 :斑岩体中的斑晶具明显的包含、筛状、间隙、聚合及次生加大等变斑晶结构。斑晶 (石英 )中流体包裹体具有饱和及过饱和盐水蒸气沸腾流体包裹体组合的特征 ,缺乏熔融包裹体。该沸腾流体包裹体组合(全岩 )中过饱和盐水包裹体占 2 9% ,饱和盐水包裹体占 2 % ,不饱和盐水包裹体占 4 5 % ,气相包裹体占 2 4 %。根据饱和盐水包裹体的均一温度确定斑晶的形成温度区间为 3 11～ 4 0 7℃。流体包裹体的成分主要为H2 O ,CO2 ,K+,Na+,Cl-,SO2 -4等 ,从而进一步论证了斑岩铜矿中含矿斑岩体并非岩浆直接结晶的产物 ,而很可能是由深部富K ,Na ,Si的热流体交代或局部熔融上部含Cu硅酸盐地壳的结果。  相似文献   

巨野煤田三角洲沉积体系及其聚煤特点     

韩美莲  魏久传 《沉积学报》2001,19(3):381-385,432

通过对钻孔岩心和测井资料的详细观测和分析 ,研究了巨野煤田石炭—二叠系沉积相及旋回特点 ,划分了层序及内部单元 ,建立了层序地层格架。在此基础上 ,通过编制以准层序为基本单位的富煤单元图和砂分散体系图 ,对研究区三角洲沉积体系煤聚积规律进行了系统分析。研究表明 ,巨野煤田的山西组中可识别出 2～ 3套河控浅水三角洲沉积序列。总体上 ,巨野煤田处于大型三角洲体系的三角洲平原部分 ,有利于煤聚积 ,但后期的河流冲刷、改道成为煤赋存的不利因素  相似文献   

Planktoneustonic algae in the surface films of Lake Zürich: Occurrence and dependence on phytoplankton succession     

Astrid Nägeli  Ferdinand Schanz 《Aquatic Sciences - Research Across Boundaries》1990,52(3):269-286

Samples of surface films and of the underlying bulk water at 0.2 m depth were taken in Lake Zürich on 48 occasions in 1986, 1988 and 1989, with the aim of assessing the appropriateness of applying existing neuston nomenclature to the organisms found in these films, of determining which organisms accumulate there during which periods of time, and of assessing the importance of the phytoplankton community in the development of neustonic biocoenoses. Lake Zürich surface films were found to support a community of high population density, consisting of organisms which had migrated from the benthal or pelagial, or which had entered the film via the atmosphere or inflowing rivers. In all samples, species originating from within the phytoplankton community accounted for the greatest proportion of the total abundance. Several of these species were found to exhibit a special preference for the surface biotope, viz. those with a relative frequency (rF) exceeding 10%, a mean enrichment factor (Ef) exceeding 100, and, in the majority of cases, with a greater concentration of individuals in the surface film than in the underlying bulk water layer. We suggest that only those organisms occurring in the surface films of large water bodies which fulfil the above criteria should be considered as belonging to the planktoneuston, in order to distinguish them from other species, the occurrence of which in surface films is merely coincidental. The fact that planktoneustonic algae are dominant in the surface films of Lake Zürich means that changes in the species composition of the planktonic algal biocoenosis directly affect the species composition of the neustonic algal biocoenosis. Thus, just as in the underlying bulk water, a succession can be observed in the algal biocoenosis of the surface films. However, because of the higher abundance of planktoneustonic algae there, this succession is distinct from that occurring in the pelagial. Factors bringing about these differences which are discussed for the case of the dominant planktoneustonic algae are: alterations in specific gravity; positive phototaxis; and enhancement of growth rates in surface films as compared with the underlying bulk water.  相似文献   

大柴旦盐湖硼,锂分布规律（续）   总被引：1，自引：0，他引：1  

李家棪 《盐湖研究》1994,2(2):20-28

大柴旦盐湖硼、锂分布规律（续）李家棪（中国科学院青海盐湖研究所，西宁８１０００８）ＤｉｓｔｒｉｂｕｔｉｖｅＲｅｇｕｌａｒｉｔｙｏｆＢｏｒｏｎａｎｄＬｉｔｈｉｕｍｉｎＤａＱａｉｄａｍＳａｌｔＬａｋｅ￥ＬｉＪｉａｙａｎ（Ｑｉｎｇｈａｉｉｎｓｔｉｔｕｔｅｏ...  相似文献   

固体矿产地球化学勘查进展与成果   总被引：4，自引：0，他引：4  

牟绪赞  奚小环 《物探与化探》1996,20(4):241-249

为庆祝第三十届国际地质大会在北京召开,让世界各国地质同行们了解中国地矿部门固体矿产地球化学勘查工作的进展,本文主要介绍我国地球化学勘查的成果。近十五年来已完成区域化探覆盖面积517万km2,中比例尺化探普查面积约90万km2,发现各类化探异常约4.3万处,通过检查化探异常和工程验证发现具工业价值的大、中、小型矿床569处,找矿效果非常显着,特别是化探找金、银矿方面取得突破性成果,化探方法技术不断提高和广泛推广。特殊景观区的野外工作方法、化探样品微量、痕量元素测试方法技术、化探异常的查证方法及化探数据处理与成图等方面均接近或达到国际水平。回顾过去,地球化学勘查进展迅速,成果丰硕,技术水平不断提高。展望未来,地球化学勘查目标明确,任务繁重,地质找矿潜力巨大。  相似文献   

胶北荆山群富铝片麻岩的脱水熔融实验研究     

周喜文  李宪洲  张东丽 《矿物岩石》2002,22(4):21-26

通过对胶北荆山群富铝片麻岩块状样品的脱水熔融实验研究表明，半开放体系下富铝岩石熔融作用的发生首先表现为含水矿物黑云母的暗化脱水，并诱发其他矿物熔融，各矿物组分参与熔融的顺序为：Bi→Kf→Pl→Gt→Cord→Sil→Q。研究发现石榴石这种原认为比较难熔的矿物，当其被大量黑云母包围时极易熔融，而黑云母脱水并生成一种强腐蚀性流体物质，是导致矿物及岩石发生熔融的主要原因。熔体的成分既依附于其周边的矿物相，但又有所差异，具有多相混熔的特点。实验过程中某些新生结晶矿物的出现表明熔融变质反应的发生可能未必需要很长的时间，也未必是在宏观平衡状态下。  相似文献   

山东金岭杂岩体内尖晶石-刚玉-碱性长石岩——一种极罕见的富铝碱质交代岩的发现   总被引：1，自引：0，他引：1       下载免费PDF全文

李大新  赵一鸣 《岩石矿物学杂志》1997,(1)

作者在山东金岭杂岩体内发现了一种由尖晶石刚玉碱性长石组成的富铝碱质交代岩。此类岩石以往国内未曾有过报导，实属罕见。根据该岩石产出的地质、岩石及岩石化学等特征，初步探讨了这类富铝碱质交代岩的形成机理。其成因独具特色，明显不同于由粘土矿经变质作用而形成的杂刚玉，可能是岩浆晚期富含碱质组分（Ｎａ２Ｏ＋Ｋ２Ｏ）的伟晶岩流体与杂岩体内中石炭纪的粘土岩、粘土质页岩或粘土质角岩等捕虏体作用时形成的交代产物  相似文献   

秦岭硒矿床的发现与应用及其形成机制研究   总被引：1，自引：0，他引：1  

涂怀奎 《矿产与地质》2008,22(1):27-32

根据秦岭地区富硒矿床的发现,总结了富硒矿床分布特征与应用及其形成的机制与硒元素成矿模式,最后提出了找矿方向。  相似文献   

Suitability of Mn‐ and Fe‐Rich Reference Materials for Microanalytical Research          下载免费PDF全文

Dorothea S. Macholdt  Klaus Peter Jochum  Stephen A. Wilson  Laura M. Otter  Brigitte Stoll  Ulrike Weis  Meinrat O. Andreae 《Geostandards and Geoanalytical Research》2016,40(4):493-504

Manganese‐ and iron‐rich materials are of major geoscientific and economic interest, many of which contain microscopic features that provide valuable information. To obtain accurate results, a homogeneous microanalytical reference material for calibration is needed. Several researchers have used the Mn‐ and Fe‐rich RMs, JMn‐1, NOD‐A‐1, NOD‐P‐1 and FeMn‐1, for this purpose; therefore, they were tested in this study to determine their suitability for microanalysis. Their homogeneity was investigated by laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) with two different types of lasers (nano‐ and femtosecond), with spot and line scan analyses and with different operating parameters, such as spot size, pulse repetition rate and fluence. As the established manganese nodule RMs revealed inhomogeneities for picogram to microgram test portions, we also investigated the new synthetic Fe‐ and Mn‐rich RM, FeMnOx‐1. FeMnOx‐1 was found to be homogeneous for large (ø 40 μm: 2% RSD repeatability) and small (ø 8–10 μm: 10% RSD repeatability) spot sizes. This homogeneity is in the range of the homogeneous NIST SRM 610 and GSE‐1G reference glasses. Furthermore, FeMnOx‐1 revealed a large‐scale homogeneity within uncertainties of a few per cent, using test portions in the ng range, when measuring four individual mounts of this material.  相似文献