The Evolutionary History of Ore-forming Processes of Metallic Ore Deposits in Northern Guangxi1

Abstract The northern Guangxi region is an important rare metal, rare earth metal and polymetallic metallogenic province. In the region there exist five metallogenic series and two metallogenic subseries, whose metallogenesis shows features of polycyclic spiral evolution throughout the geological history. As far as various cycles are concerned, mantle-derived ore substances were reduced while crust-derived ore substances increased from early to late times; in the whole geological evolutionary history, mantle-derived substances decreased gradually while crust-derived ones increased. Meanwhile ore element associations became more and more varied. In terms of space, mineralization migrated from the old basement outwards, i.e. from west to east during the Precambrian, and from north to south during the Phanerozoic, and again from east to west during the Yanshanian.     

江西凤凰岽含锡黄英岩脉特征及成因

江西会昌县岩背火山盆地密坑山含黄玉花岗岩体的北侧外接触带，产有数条含锡黄英岩脉。据野外产状、岩石结构构造等表明岩脉属岩浆成因。稀土元素研究表明，凤凰岽黄英岩ＲＥＥ含量极低，∑ＲＥＥ及配分曲线与脉侧黄玉石英化蚀变岩有着明显的区别。富氟花岗岩浆结晶晚期衍生的富Ｓｉ，Ａｌ，Ｆ含少量Ｋ，Ｎａ的残余熔浆沿断裂上侵因压力降低产生二次沸腾，使Ｋ，Ｎａ分离进入含水相，这是富Ｓｉ，Ａｌ，Ｆ；极贫Ｋ，Ｎａ的黄英岩形成的决定因素。     

The Evolutionary History of Ore-forming Processes of Metallic Ore Deposits in Northern Guangxi

The northern Guangxi region is an important rare metal, rare earth metal and polymetallic metallogenic province. In the region there exist five metallogenic series and two metallogenic subseries, whose metallogenesis shows features of polycyclic spiral evolution throughout the geological history. As far as various cycles are concerned, mantle-derived ore substances were reduced while crust-derived ore substances increased from early to late timesfin the whole geological evolutionary history, mantle-derived substances decreased gradually while crust-derived ones increased. Meanwhile ore element associations became more and more varied. In terms of space, mineralization migrated from the old basement outwards, i.e. from west to east during the Precambrian, and from north to south during the Phanerozoic, and again from east to west during the Yanshanian.     

电镀金刚石钻头镀层与钢体结合强度研究

采用直接剪切试验,研究了稀土添加量、镀液pH值和电流密度对结合强度的影响;并结合试样断口的扫描电镜分析结果,对镀层的破坏形式进行了讨论.     

利用卫星ETM与样方统计数据研究西鄂尔多斯珍稀濒危植物种群分布规律

使用1999年8月30m分辨率的ETM遥感数据、DEM数据和25个典型的4^4m^2的地面实测样方统计数据、数字化了1994年的珍稀淑危植物分布图，用遥感技术西鄂尔多斯珍稀濒危植物群落进行了水平和垂直带分布规律的研究。图像处理采用遥感弱信息提取技术，识别了建群植物及其种群组合特征；并结合三维景观影像对珍稀植物种群生存生境的地貌、土壤等条件的相关性进行了分析，揭示了垂直、水平地带分异规律，建立了相关分析模型。研究结果为珍稀濒危植物动态监测和物种多样性保护提供了新的技术方法和分析决策依据。     

稀土在热压人造金刚石工具中的应用研究

稀土有其独特的物理化学性能 ,能有效地提高硬质合金的综合性能。将稀土在硬质合金中的应用成果借鉴到金刚石工具研制中 ,并对其关键的掺杂工艺进行改进 ,取得了成功。对于以 Fe代 Co和提高金刚石工具的性能起到了明显的作用。     

四川牦牛坪稀土矿床矿物流体包裹体研究

对矿物流体包裹体进行分析的结果表明，牦牛坪稀土矿床的矿物中存在4种类型包裹体：（1）液-所耵；（2）液-气-固相；（3）纯气相；（4）固相，矿物包裹体显微测温结果显示牦牛坪矿床成矿温度从423℃至122℃；成矿流体的盐度ω（NaCl)为11.46%-14.36%质量分数，包裹体的成分分析结果显示流体中富含CO2和其他挥发性组分，并富含大量的不同成分的矿物雏晶，根据矿床地质特征和矿物包裹体的研究结果，作者认为本矿床的成矿作用是由碳酸岩岩浆气液流体的沸腾、充填和交代过程而实现的。     

Trace Elements Analysis of Geological Samples by Laser Ablation Inductively Coupled Plasma Mass Spectrometry

ＩＮＴＲＯＤＵＣＴＩＯＮＬａｓｅｒａｂｌａｔｉｏｎｉｎｄｕｃｔｉｖｅｌｙｃｏｕｐｌｅｄｐｌａｓｍａｍａｓｓｓｐｅｃｔｒｏｍｅ ｔｒｙｉｓａｎｉｎｃｒｅａｓｉｎｇｌｙｄｅｖｅｌｏｐｅｄａｎａｌｙｔｉｃａｌｔｅｃｈｎｉｑｕｅｆｏｒｓｏｌｉｄｓａｍｐｌｅａｎａｌｙｓｉｓ.ＬＡ ＩＣＰ ＭＳｏｆｆｅｒｓａｔｔｒａｃｔｉｖｅｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｈｉｇｈｓｅｎｓｉｔｉｖｉｔｙ ,ｌｏｗｄｅｔｅｃｔｉｏｎｌｉｍｉｔｓ,ｍｉｎｉｍａｌｓａｍｐｌｅｐｒｅｐａｒａ ｔｉｏｎ ,ｌｅｓｓｏｘｉｄｅｓｉｎｔｅｒｆｅ…     

金刚石碎岩工具胎体材料添加稀土元素的试验研究

对胎体材料中添加稀土元素问题进行了试验研究。对添加稀土和未加稀土的胎体性能进行测试，结果表明，添加稀土比未加稀土的胎体材料的抗弯强度、硬度和冲击韧性均有所提高，其中抗弯强度提高了10％－62％，冲击韧性提高了5％。胎体中添加稀土对提高胎体和金刚石碎岩工具的技术经济指标具有重要作用,并且为在胎体材料中实现以Fe代Co创造了有利条件。     

浙江天目山自然保护区珍稀濒危植物及其利用与保护

天目山是浙江省珍稀濒危植物最丰富的地区，共有国家保护的珍稀濒危植物２５科、３４属、３７种，其中属二级保护１３种，三级保护２４种．论述了天目山珍稀濒危植物的区系特点、类型及地理分布，列举了它们的一些利用价值，最后提出了保护天目山珍稀濒危植物的一系列建议．