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1.
香港中生代火成岩U—Pb法年龄测定   总被引:1,自引:0,他引:1  
Davis  DW 《广东地质》1998,13(3):59-68
香港中生代侵入岩和火山岩22个锆石和独居石新的U-Pb年龄,揭示了中侏罗世至早白垩世火山-深成作用分为4期,(164.6±0.2)×10^6~(159.3±0.3)×10^6a,(146.6±0.2)×10^6~(146.2±0.2)×10^6a,(143.7±0.3)×10^6~(142.5±0.3)×10^6a,(140.9±0.2)×10^6~(140.4±0.2)×10^6a。从最早知道的  相似文献   

2.
薛光 《黄金地质》1995,1(1):68-72
研究了利用二苯硫脲-甲基异丁酮泡塑振荡吸附富集Au,Ag的条件,并采用金试剂-TBP液珠萃取比色法测定地质样品中的金,银,方法的检出限:Au为0.5×10^-9,Ag为5×10^-9。  相似文献   

3.
敦德冰芯过去800a来的甲烷记录   总被引:4,自引:2,他引:2  
郭德冰芯上部95m的12个样品记录了近800a来冰内气泡包裹气体中甲烷的浓度变化,结果表明,最近200a来该冰芯记录的甲烷浓度急剧上升,与南极及格陵兰的甲烷记录反映的趋势相一致,但与两极同时代样品相比,其浓度总体上要高出0.5×10^-6~0.6×10^-6mol/mol在这之前,3者基本保持一致,在0.7×10^-6~0.8×10^-6mol/mol之间波动。  相似文献   

4.
薛光 《黄金地质》1996,2(1):77-79
研究了黄原酯棉振荡吸附Au的条件和解脱方法,并利用氢醌滴定法测定矿石中的金。方法的测定范围为0.5×10^6-××.10^-6。方法的相对标准偏差RSD=1.35%,可用于矿石中金的野外快速测定。  相似文献   

5.
五大连池火山区气体地球化学特征   总被引:26,自引:1,他引:25  
杜建国  任锦章 《地球化学》1999,28(2):171-176
根据泉(池)水中气体的组分和同位素组成,讨论了五大连池火山区气体的来源和运移。1997年8月从五大连池火山区泉中采用了9个气、水样品,同年9月测定了游离气和水溶气的气体组分、He同位素幽会和CO2的δ^13C值。气体以CO2为主,多数样品的CO2体积分类大于80%。He和CH4的体积分数变化范围大,分别为0.7×10^-6-380×10^-6和4.0×10^-6-180×10^-6。^3He/He  相似文献   

6.
华北地台北缘的工产辽和南缘的东秦岭两个钼矿带闻名遐迩。本文用同位素稀释-等离子体质谱法,直接测定了燕辽钼矿带中兰家沟钼矿床的Re-Os等时线年龄为(186.5±0.7)×10^6a,杨家杖和肖家营子钼矿床的Re-Os模式年龄为(187±2)×10^6d-(d191±6)×d10^6a和(177±5)×10^6a,小寺沟和寿王坟铜矿床的Re-Os模式为DD(134±3)×10^4a和(148±4)×  相似文献   

7.
试验拟定了碲金共沉淀富集分离金-火焰原子吸收测定铜精矿,硫精矿,混合精矿及铁矿石中金的方法。方法易于掌握,回收率〉98%,精密度,准确度均好,适用于0.5×10^-6-200×10^-6Au的测定。  相似文献   

8.
新类型金矿—萤石型金矿的矿石学研究   总被引:1,自引:0,他引:1  
浙东南萤石型金矿赋存于萤石矿田中,是一个受陈蔡群层位控制的新类型金矿。矿石中金属最高含量为54×10^-6,一般5×10^-6-25×10^-6,主要工业矿物的银金矿。成矿有多期次的特性。矿石中还含Se.  相似文献   

9.
将锍试金改成小锍试金,用小锍和捕集法把分解样品同富集金属与分离基体成份结合在一起进行,炼得的锍和经酸处理除去贱金属硫化物,富集的贵金属采用无火焰原子吸收光说测定。取一份样可以测定Au,Pt,Rh和Pd。测定方法的特征质量:Au1.1×10^-11,Pt1.3×10^-19Pd1.3×10^-11,Rh1.2×10^-11;线性范围(μg/ml);Au0-0.40Pd和Rh为0-0.050,PtO  相似文献   

10.
在PH3.4时,铱能与碘化钾、丁基罗丹明B型成紫色络合物,其组成比Ir4+:I^-:BRhB^+=1:6:2,最大吸收波长为610nm,ε=1.36×10^5L.mol^-1.cm^-1,铱在(0-8)μg/25ml范围时服从比尔定律,采用阳离子交换树脂分离大量基体离子,可对冶金物料中微量铱进行测定。  相似文献   

11.
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.  相似文献   

12.
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931.  相似文献   

13.
PALEONTOLOGY     
正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.)  相似文献   

14.
正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.)  相似文献   

15.
正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.)  相似文献   

16.
PETROLOGY     
正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus.,  相似文献   

17.
正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an  相似文献   

18.
正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of  相似文献   

19.
正20140582 Fang Xisheng(Key Lab.of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China);Shi Xuefa Mineralogy of Surface Sediment in the Eastern Area off the Ryukyu Islands and Its Geological Significance(Marine Geology Quaternary Geology,ISSN0256-1492,CN37  相似文献   

20.
正20141810 Bian Yumei(Geological Environmental Monitoring Center of Liaoning Province,Shenyang 110032,China);Zhang Jing Zoning Haicheng,Liaoning Province,by GeoHazard Risk and Geo-Hazard Assessment(Journal of Geological Hazards and Environment Preservation,ISSN1006-4362,CN51-1467/P,24(3),2013,p.5-9,2 illus.,tables,refs.)  相似文献   

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