庞家河微细浸染型金矿金的赋存状态   总被引：1，自引：0，他引：1  

权志高 《华东地质学院学报》1996,19(3):224-230

本文论述了庞家河金矿矿石中的主要在金矿物和载金矿物，金然矿石中的配分微型赋存状态矿石中金矿物主要有自然金银金矿；主要载金矿物是黄铁矿，毒砂和粘土质矿物（含绢云母和少量粉砂质）金主要为次显微金，粒度在０．０２５～０．１μｍ之间，呈小圆球状及链状的独立金矿物（自然金）充填在黄铁矿，毒砂的微裂隙度或沉淀在晶面上或吸附在晶体边缘。在氧化或半氧化矿石中，可见到一部分可见金或显微金。  相似文献   

赤泥硅肥在玉米上试验研究   总被引：2，自引：0，他引：2  

蔡德龙  赵世立 《地域研究与开发》1997,16(3):83-84

玉米约占全国粮食总产的２０％，施肥在玉米增产诸因素中能起到２５％～３０％的作用，通过试验，玉米施用硅肥后提高抗青枯病能力，施肥量为７５０ｋｇ／ｈｍ＾２时，在玉米上的增产效果达到１４％～２３．４％，投入产出比为１：１０～２０。  相似文献   

湖北阳新富水金矿金的显微研究     

洪汉烈  彭长琪 《矿物学报》1997,17(2):169-174

富水金矿为风化型金矿床，本文报道了该矿床金的显微分析结果。运用电子探针、电子显微镜以及光学显微镜等分析手段，查明矿床中金的产出状态、颗粒大小以及金矿物的化学成分等特征。这些金以次显微金的形式吸附于粘土矿物高岭石、水云母的晶体边缘，或混杂于褐铁矿中的外铁矿晶体集合体之间；此外，部分以显微的粒间金形式产出。根据能谱成分分析及电子探针分析，这些金均为独立的自然金矿物，具有极高的成色。  相似文献   

钛铁矿中二氧化硅的硅钼蓝分光光度法测定     

蔡玉曼  许又方 《岩矿测试》2007,26(1):75-77

用氢氧化钠-过氧化钠混合熔剂分解样品，酸提取后加入亚硫酸钠水浴加热消除过氧化氢和大量钛的干扰，硅钼蓝分光光度法快速测定钛铁矿中二氧化硅的含量。经国家一级标准物质分析验证，结果与标准值相符，相对标准偏差（RSD，n=7）为0．34％～2．24％。  相似文献   

中国自然铜矿化类型、特点及形成机理浅析     

王大鹏  张乾  朱笑青  张正伟 《矿物学报》2007,27(1):57-63

铜在自然界中多以氧化物和硫化物形式存在,只有少部分以单质或者合金状态产出。总结了自然铜矿化的类型、特点、形成条件以及成矿机理,阐述了找矿前景。自然铜的矿化类型主要有岩浆岩型、砂岩型等,部分与有机质共生或产在氧化带,产出环境为低温、弱碱性还原环境。玄武岩型自然铜矿化分布广、规模大,是形成工业矿床最有利的矿床类型;砂岩型自然铜矿床主要见于湖南麻阳一带,成矿前景优越,有可能找到更多更大的工业矿床(体)。  相似文献   

自然重砂数据库系统(ZSAPS 1.0)的应用     

梁伟杰  李任时  孟嵩  周文瑾 《吉林地质》2007,26(1):55-60

运用自然重砂数据库系统(ZSAPS 1.0),对以前的自然重砂数据作了重新处理发现了很多有用信息,强化了异常规模,扩大异常范围,使得重砂资料的处理更系统化、标准化,为地质找矿提供了可靠根据。  相似文献   

Variability of a cyprinid lake ecosystem with special emphasis on the native fish fauna under intensive fisheries management including common carp (Cyprinus carpio) and silver carp (Hypophthalmichthys molitrix)     

Detlev BarthelmesUwe Brämick 《Limnologica》2003,33(1):10-28

The lake investigated (Lake Heiliger See near the town of Angermünde, North-East Germany) is small (10.2 ha) but deep (z_max = 12 m, ? = 6.5 m). During summer the thermocline is at a depth of 4-5 m, and the hypolimnion is filled with H₂S already by mid-June, making 60-75% of the bottom area inaccessible to fish. The native fish fauna is dominated by planktivorous roach (Rutilus rutilus). A test stocking of silver carp (Hypophthalmichthys molitrix) together with an unplanned and erroneous stocking of common carp (Cyprinus carpio), coupled with an incorrectly calculated strong stocking of eel (Anguilla anguilla), which assumed that the total lake area yielded fish food organisms, brought about a strong depression of the food biomass available to native fish. Both silver carp and common carp showed a pattern of behaviour which only partly agreed with results obtained in experimental ponds prior to lake stocking. At least for 10 years there was a very low zooplankton biomass (mostly below 1 mg/l fresh weight) caused by silver carp and a strongly reduced benthos biomass (frequently below 1 g/m² fresh weight) caused by common carp and eel on H₂S-free bottom areas. Despite this extreme situation, which lasted for 20 years and is rarely found in lakes elsewhere, it was not possible to demonstrate negative effects on the native fish fauna comprising 16 species. Also the dominance pattern seems uninfluenced in the long run. A strong decline of the catchable roach stock was observed for some years, but the stock reappeared soon in comparable quantity. During the time of roach stock depression the individual growth of roach (and common carp) was particularly low. Nevertheless, roach succeeded in reproduction during this time in spite of the reduced zooplankton and detritus concentrations. Fry numbers per year ranged from 500-15 000 individuals/ha. The pike perch (Stizostedion lucioperca) was perhaps the most endangered species of all those living at small population numbers in the lake, since its fry is confined to the limnion where competition from silver carp and adult roach and perhaps predation by roach is highest. However the pike perch stock remained unchanged at the low level of 1950, the time prior of carp and eel stocking. All other rare species of Lake Heiliger See spawn in the littoral zone where fry survival conditions were less impacted. In summary, we present more evidence that the fish fauna of cyprinid lakes is more robust than in salmonid lakes. The regulation capacity of fish communities of eutrophic lakes seems to be able to offset even severe direct and indirect influences of fisheries management.  相似文献   

藏南马扎拉金锑矿自然金的再溶解行为          下载免费PDF全文

刘敏  黄云阶 《沉积与特提斯地质》2004,24(2):92-95

笔者从研究马扎拉金锑矿矿石中的自然金重溶现象入手，指出马扎拉金锑矿的成矿物质经过了后期低温热液的改造。后期低温热液的活动作用较弱，但其无助于成矿物质的富集，反而降低了金矿物的成色。  相似文献   

水稻施用硅肥研究综述   总被引：10，自引：0，他引：10  

文春波  高红莉  蔡德龙  陈常友 《地域研究与开发》2003,22(3):79-81

文章首先综述了水稻施用硅肥后增产的机理，以及施用硅肥对水稻的叶片、植株、根系和抗逆性产生的积极影响，然后对水稻施用硅肥的增产效果以及增产幅度与土壤有效硅含量的关系作了总结，认为各地区施用硅肥的增产幅度存在差别，且北方一般高于南方；不同土壤类型，缺硅临界值应不同，并提出了华北平原的缺硅临界值为250mg/kg。最后，对今后的研究趋势作了论述。  相似文献   

美国基维诺自然铜矿床成矿环境、成矿作用和机制   总被引：1，自引：0，他引：1  

胡正纲 《四川地质学报》1998,(1)

基维诺自然铜矿床生成于陆内裂谷环境。丰富的铜质来自巨厚的裂谷火山岩系（橄榄拉斑玄武岩）。由挤压变形事件产生的断层－裂隙网络为含矿流体向上运移提供了通道。在流体运移过程中,热冷两种流体混合,发生了冷却作用和水岩反应,为低硫的含铜流体沉淀自然铜提供了必需的还原环境。自然铜矿床产出于顶部熔岩流内  相似文献