排序方式： 共有87条查询结果，搜索用时 31 毫秒
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流体包裹体成分物理化学参数的NET2.0C#语言计算程序 总被引：1，自引：0，他引：1
根据地球化学热力学原理,利用流体包裹体成分测试数据和有关热力学原理,在原有基础上采用NET2.0 C#语言进行修编,编制成目前切实可行的计算机处理程序——矿物包裹体成分、物理化学参数的计算程序.其目的是方便广大地质工作者将这些参数用于地质找矿和科学研究中. 相似文献
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新疆东准噶尔老鸦泉富碱花岗岩型锡矿床地质及成矿流体 总被引：3，自引：2，他引：1
老鸦泉碱性花岗岩位于新疆北部东准噶尔地区。老鸦泉碱性花岗岩体及其内卡姆斯特、干梁子锡矿床的矿石和岩石的岩矿鉴定、稀土元素以及流体包裹体的系统研究表明,老鸦泉碱性花岗岩及其内的花岗斑岩及含矿石英岩、云英岩化锡矿体、石英脉锡矿体,实际上是富碱花岗质岩浆逐渐分异演化的同源和最终产物,锡成矿流体为中-高温、低盐度。碱性岩浆晚期分异的大量气水热液富锡、富硅、富碱、富含F、Cl、SO24离子及离子团,其氧逸度高、酸度高、温度高,这种热液引起花岗岩体的硅化、云英岩化等自变质作用,在该作用中随温度、压力的降低及CH4等还原性气体及CO2气体的逃逸,改变了成矿流体的氧化-还原环境,流体向相对还原及碱性条件转化,在新的氧化还原、酸碱度界面条件下,其携带的锡的络合物不稳定而分解,锡沉淀成矿。 相似文献
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矿床成矿系列理论在中国经过三十多年的发展,已被广泛应用于找矿勘查实践。文章在以往矿床成矿系列研究的基础上,对中国铜矿床的成矿系列进行了补充与完善,厘定出30个以铜为特色的矿床成矿系列。结合全国地质与成矿演化,分析铜矿床成矿系列在主要地质历史时期的特点与时空分布规律,其中,前寒武纪7个铜矿床成矿系列,矿床类型以变质型和岩浆型为主;古生代8个铜矿床成矿系列,矿床类型以海相火山岩型为主;中生代13个铜矿床成矿系列和新生代2个铜矿床成矿系列,矿床类型均以斑岩型和矽卡岩型为主。西藏地区铜矿找矿突破显著,新增2个全国范围的铜矿床成矿系列。矿床成矿系列的复合,是中国铜矿床成矿系列研究的重要成果和特色。 相似文献
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This paper describes studies on the integrated risk assessment and zoning of meteorological disaster in Heilongjiang Province,in northeastern China,by using information-diffusion theory and cluster method with 35 years of summer temperature and precipitation data from 74 meteorological stations from 1971 through 2005.The information-diffusion theory has been used extensively in risk assessment,yet almost no one has done research about risk assessment by information-diffusion theory based on meteorological disaster standards.Some research results are as follows:the risk probability of low temperature and cold damage in the northern region is higher than that in the southern region;the risk probability of general low temperature and cold damage in the southwestern region is the highest;the risk probability of serious low temperature and cold damage in the northern region is the highest,followed by the central and southeast region;the high-risk region of arid disaster in Heilongjiang Province was primarily located in the southwestern,central,and southern parts of the province;the high-intensity arid disaster was located in the south-eastern region;the high-risk region of flood in Heilongjiang Province was primarily located from the southwest and then across the central part to the western part of Heilongjiang Province;the high-intensity flood disasters were located in almost every part of Heilongjiang Province.We can conclude from the integrated meteorological disaster risk zoning that the high-risk region of mete-orological disaster is primarily located in the southern and northern part of the province,the moderate-risk region is distributed in the central southern region and western region,the low-risk region is located in the eastern part,and the light-risk region is located in the central western part of Heilongjiang Province. 相似文献
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Based on remote sensing snow water equivalent (SWE) data, the simulated SWE in 20C3M experiments from 14 models attending
the third phase of the Coupled Models for Inter-comparison Project (CMIP3) was first evaluated by computing the different
percentage, spatial correlation coefficient, and standard deviation of biases during 1979–2000. Then, the diagnosed ten models that
performed better simulation in Eurasian SWE were aggregated by arithmetic mean to project the changes of Eurasian SWE in
2002–2060. Results show that SWE will decrease significantly for Eurasia as a whole in the next 50 years. Spatially, significant
decreasing trends dominate Eurasia except for significant increase in the northeastern part. Seasonally, decreasing proportion will
be greatest in summer indicating that snow cover in warmer seasons is more sensitive to climate warming. However, absolute decreasing
trends are not the greatest in winter, but in spring. This is caused by the greater magnitude of negative trends, but smaller
positive trends in spring than in winter. The changing characteristics of increasing in eastern Eurasia and decreasing in western
Eurasia and over the Qinghai-Tibetan Plateau favor the viewpoint that there will be more rainfall in North China and less in the
middle and lower reaches of the Yangtze River in summer. Additionally, the decreasing rate and extent with significant decreasing
trends under SRES A2 are greater than those under SRES B1, indicating that the emission of greenhouse gases (GHG) will speed
up the decreasing rate of snow cover both temporally and spatially. It is crucial to control the discharge of GHG emissions for
mitigating the disappearance of snow cover over Eurasia. 相似文献
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Biases in shortwave cloud radiative forcing (SWCF), which cause overestimates in tropical regions and underestimates in subtropical marine stratocumulus regions, are common in many climate models. Here, two boundary layer processes are investigated in the atmospheric model GAMIL2, entrainment at the top of the boundary layer and longwave radiative cooling at the top of stratocumulus clouds, in order to reduce biases and reveal the mechanisms underlying these processes. Our results show that including the entrainment process in the model can reduce negative SWCF biases in most tropical regions but increases positive SWCF biases in subtropical marine stratocumulus regions. This occurs because entrainment reduces the low-level cloud fraction and its cloud liquid water content by suppressing the vertical turbulent diffusion in the boundary layer and decreasing the relative humidity when warm and dry free atmosphere is entrained in the boundary layer. Longwave radiative cooling at the top of stratocumulus clouds can enhance turbulent diffusion within the stratocumulus-topped boundary layer. When combined with the entrainment process, longwave radiative cooling reduces the positive SWCF biases in subtropical marine stratocumulus regions that are observed using the entrainment process alone. The incorporation of these two boundary layer processes improves the simulated SWCF in tropical and subtropical regions in GAMIL2. 相似文献
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萨吾斯矿床位于麦兹盆地东部,是一个新近发现和勘探的铅锌矿床。萨吾斯铅锌矿床赋存于下泥盆统康布铁堡组上亚组凝灰岩、流纹岩及其沉积碳酸盐夹层,矿（化）体直接受石榴黑云矽卡岩和铁闪石矽卡岩控制,表现出火山喷流-沉积成矿和矽卡岩矿床的双重特征。这两类矿床的重要区别之一是同生和后生成矿。对主要矽卡岩矿物铁闪石进行精确的Ar-Ar年龄测定,将其与康布铁堡组流纹岩的年龄对比,有助于确定萨吾斯铅锌矿床的成因。高精度、高灵敏度激光40Ar-39Ar测年方法,为解决闪石类低K矿物的定年提供了新的手段。岩芯样品SW85中,铁闪石晶粒较大、晶形发育,与闪锌矿、碳酸盐矿物和石榴子石都具有平直的边界,而不是复杂交生,不含矿物和流体包裹体,代表了相对简单均一的系统。对SW85的铁闪石做了激光40Ar-39Ar测年,其结果为412±15Ma,与康布铁堡组流纹岩的SIMS锆石U-Pb年龄（401±2.7Ma）和别斯萨拉玢岩的SIMS锆石U-Pb年龄（401±3.1Ma）在误差范围内一致,表明矽卡岩和铅锌矿的形成与康布铁堡组流纹质火山岩的喷发及其碎屑岩的沉积是同时的,成因上密切相关。其次,矽卡岩呈层状产出,局限于康布铁堡组凝灰岩及其铁锰钙质碳酸盐夹层的范围内;石榴子石为铁铝榴石、锰铝榴石,闪石为铁闪石,缺失透辉石、钙铁辉石。上述特征与接触交代矽卡岩不同,后者以钙铝榴石、钙铁榴石、透辉石/钙铁辉石为特征,闪石为角闪石。接触交代矽卡岩矿床是后成矿床,它晚于岩浆侵入体的围岩。综上所述,萨吾斯铅锌矿是一个与康布铁堡组火山喷发和浅成侵入有关的喷流-沉积矿床。麦兹盆地的控盆断裂巴寨断裂从北西端向南东发展而成。阿巴宫-库尔提断裂和琼库尔断裂是克兰盆地的控盆断裂,它们在北西撒开、向南东收敛,具有羽状张剪性断裂的特征。因此,阿尔泰南缘在早泥盆世具有活动陆缘的局部拉张性质。西伯利亚板块与哈萨克斯坦-准噶尔板块的推错,在阿尔泰南缘产生局部张剪性应力场,从而形成了上述断裂以及早泥盆世火山-沉积盆地。 相似文献
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近40年来气候变化对青海盐湖及其矿产资源开发的影响——以小柴旦湖为例 总被引：2，自引：0，他引：2
青海是中国盐湖主要分布区之一,蕴藏着丰富的矿产资源。文章以RS和GIS技术为基础,从20世纪70年代、90年代、2000年前后、2008~2009年和2013~2014年五期Landsat遥感影像中提取了青海面积大于10 km2的所有盐湖(不包括干盐湖),分析了其近40年来的变化趋势:总体上,盐湖总面积除在2000年前后有所减少外,基本上呈现增加的趋势;具体而言,2000年前后,萎缩的盐湖主要分布在柴达木盆地;其他时期均呈现全面扩张的趋势。在全球气候变暖的大背景下,通过分析青海地区11个气象台站的年平均气温、年降雨量和蒸发量数据,可知青海地区气候呈现了向暖湿方向转型的趋势,且2002年之后更为明显。最后,以青海省小柴旦湖为例,分析了湖泊淡化、矿产资源贫化对盐湖资源开发的影响,具体为:1资源开发成本升高、难度加大,甚至使一些处于工业开发临界品位的盐湖失去开发价值;2盐湖淡化条件下,锂等矿产资源有效提取技术亟待研发;3政府制定矿产资源开发政策时,需要对气候及盐湖的动态变化过程综合考虑。以上说明,青海地区的暖湿气候使盐湖大幅度淡化,给盐湖矿产资源开发带来了新的挑战。 相似文献
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中国内生钼矿床辉钼矿的微量元素特征研究 总被引：2，自引：0，他引：2
近年来,金属硫化物微量元素研究取得了重大进展,但主要局限于少数常见的硫化物,如黄铁矿。辉钼矿作为内生金属矿床最常见的金属硫化物之一,目前对其微量元素的研究成果还很少,对微量元素的赋存状态及其揭示的成因意义还不明。文章尝试性地对中国57个内生独立钼矿床或共伴生钼矿床中的辉钼矿进行了ICP_MS微量元素分析。结合元素的地球化学性质及前人的研究成果,认为除Re、Os等少数元素可成类质同象存在于辉钼矿中以外,推测大部分微量元素可能以固溶体出溶、机械混入物或流体包裹体等形式存在于辉钼矿中。各矿床中辉钼矿微量元素相对于中国陆壳富集Cu、Zn、Pb、W等常见的成矿元素,暗示不同地质环境下不同时代和矿床类型的成钼流体搬运的成矿元素具有一致性和普遍性,这是造成钼多金属矿床金属元素矿化分带的基础。辉钼矿的主要微量元素呈对数正相关,受矿床类型和产出环境影响不大;辉钼矿Co/Ni比值多数1,集中于0.01~0.57,不同矿床类型的Co/Ni比值具有一定规律性:当w(Co)30μg/g时,斑岩型和矽卡岩型矿床中辉钼矿的Ni含量比较稳定;当w(Co)30μg/g时,Ni含量比较高;石英脉型矿床的Co/Ni比值变化较大,且小于斑岩型矿床的Co/Ni比值。在内生金属矿床中,辉钼矿主要形成于还原性环境中,但石英脉型矿床的形成条件与斑岩型矿床相比,其氧化性明显增强。根据分析结果和前人研究成果,推测成钼流体应为富CO2和Cl-(个别还富含F-)以及部分还原性气体成分(H2、CO、CH4等)的成矿流体。 相似文献