共查询到20条相似文献，搜索用时 46 毫秒
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M. S. Rao 《Journal of the Geological Society of India》2018,91(1):5-8
Pyrite containing appreciable content of cobalt (up to 5.61 wt%) and minor amounts of nickel (up to 0.70 wt%) is being reported from electron microprobe studies in a lamprophyre dyke from the Sidhi complex, Mahakoshal belt, Central India. However, cobalt and nickel are conspicuously absent from the associated chalcopyrite reflecting that in a pyrite-chalcopyrite association these elements are preferentially sequestered in pyrite. The microprobe analysis of pyrite grains reveal that their Fe content is variable (40.62 to 46.02 wt%) and reciprocally related to cobalt and nickel concentrations implying the presence of latter as solid solution in the structure of pyrite. The cobalt contents of the pyrite are comparable to those (up to 3.21 wt%) reported from the cobaltbearing pyrites of the Kalyadi copper deposits of Dharwar craton of southern India. Co:Ni (16.05 average) in the studied pyrite appears to be more consistent with a magmatic, rather than a hydrothermal, origin. However, further studies are in progess. This study highlights that besides gold and diamond, lamprophyres are also important carriers of cobalt when available in the magmatic system. 相似文献
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James.A.Holcombe,美国德克塞斯大学化学系教授,主要研究领域是痕量金属分析及原子光谱中原子化与激发过程。用时间-空间分辨光谱、质谱、高温静态二级离子质谱(SIMS)和计算机模拟等方法来研究和阐明石墨炉原子吸收体系。另一个研究课题是使用生物有机体对超痕量金属的富集。他今年九月应中山大学邀请来华讲学,现将在北京讲学(9.18—9.20)的主要内容作一介绍。 相似文献
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W. Credner 《International Journal of Earth Sciences》1940,31(1-2):94-96
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遵照毛主席“洋为中用”的教导,我对300．P．A型回转钻机的运动,进行了分析,并提出了个人改进意见,以供讨论,不妥之处,希批评指正。300．P·A型回转钻机是英国HANDS－ENGLAND OILFIELD,EQUIPMENT,LTD 相似文献
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朱汝烈 《水文地质工程地质》1986,(1)
应地矿部邀请,美国加州大学伯克利实验室地质工程学教授P.A.Witherpoon于1985年4月下旬来京访问,与部水文工程地质技术方法研究队部分技术人员就核废物地质处置问题进行了学术交流,并就双方在此领域开展技术合作的前景和途径做了初步探讨。访问期间,教授应邀做了“放射性废物的地质处置”专题学术报告,向部在京有关单位和核工业、水电等部有关人员介绍了国际上核废物地质处置工作动态、经验以及有关地质调查、选址、勘察及试验的原则,方法和技术标准,并以他主持的美国高放射性废物地质处置研究计划 相似文献
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《沉积学报》1986,(1)
应中国科学院地质所和兰州地质所的邀请,加拿大多伦多大学地质系教授A.D.Miall于1985年7月1日至30日在我国进行了为期一个月的访问。访问期间除在兰州、北京和玉门讲学外,还在酒西盆地、兰州附近和陕西礼泉唐王陵进行了野外地质考察。Miall教授是一位年轻有为、精力充沛的沉积学家,主要从事碎屑沉积,特别是冲积扇、河流、三角洲沉积的研究,以及沉积盆地分析工作。他曾在加拿大地质调查所石油和沉积研究室工作过,并曾多次在美国和其他国家举办的石油地质讲习班讲学,在1982年举行的国际沉积学家大会上他担任学术秘书长。仅从1974年起,在沉积相和沉积盆地分析等方面发表了近30篇论文。并著有《沉积盆地分析原理》和主编过《冲积盆地的沉积作用和大地构造》两本书。他学识渊博,经验丰富,是现今加拿大知名的地质学家,并活跃于国际学术机构。 相似文献
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扎瓦里茨基法(简称扎氏法,下同)是常用的岩石化学计算方法之一。在计算时过去是靠小型电算器或笔算,这种手算方式在样品数目很多时往往容易出错,且效率低、时间长。近年来虽出现了用ALGOL、BCY语言为扎氏法编写的程序,采用电子计算机运算,但因数据纸带穿孔,造成检查、修改麻烦,而且计算时要到电算站上机,所以不易推广。可是微型电子计算机比其他大、中、小电算机具有使用方便、成本低等优点。当前很多单位都购买了这种微型机,这样就为计算扎氏法提供了条件。一般微型机软件都配有 相似文献
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我們敬爱的苏联?宜骺坡宸蛲?于去年六月回国休假及参加第三届全苏水文代表大会后本月十日又回到了北京。在机場上受到了水文局蔡振副局長、王子平副局長、水利科学研究院謝家泽副院長、水文研究所叶永毅副所長等的热烈欢迎。 相似文献
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Eclogites were relatively recently found in the Belomorian Mobile Belt (BMB) (Volodichev et al., 2004; Shchipanskii et al., 2005; Konilov et al., 2004). The very first isotopic dates (Volodichev et al., 2004; Mints et al., 2010) were obtained for these rocks in the northwestern (in the Salma and Kuru-Vaara areas) and central (Gridino area) portions of BMB and corresponded to the Archean: approximately 2.72–2.87 Ga. Because no crustal eclogites older that 2.0 Ga (Möller et al., 1995) had been known before these dates were obtained, these eclogites were regarded as unique. It is commonly believed that no crustal eclogites could be formed in the Archean because the crust was then relatively thin (Kröner, 2010), and hence, the find of crustal eclogites of Archean age in BMB called for a fundamental revision of geodynamic reconstructions of the crustal evolution and was one of the main arguments invoked to support the hypothesis that currently operating geodynamic mechanisms of plate tectonic can be extrapolated to the Early Precambrian (Rozen et al., 2008). However, these finds were practically immediately followed by serious doubts that the primary estimates of the timing of the eclogite metamorphism in the Belomorian Belt may be incorrect (Mitrofanov et al., 2009; and others). 相似文献