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1.
中国锡矿床的稀土元素地球化学特征 总被引：2，自引：1，他引：2
系统地研究中国锡矿床含锡花岗岩、蚀变岩和各种产状锡矿体中锡石的稀土元素地球化学特征，总结了含锡花岗岩成矿性评价的稀土元素地球化学定量组合标志，探讨了主要类型锡矿床的成矿物质来源和成因。 相似文献
2.
论述大井－－安乐锡矿稀土元素特征与成矿关系。确定锡石的∑ＲＥＥ由成矿早期到晚期逐渐降低,锡石与有成因联系的岩石的稀土元素地球化学特征具有明显继承和发展演化的关系,反映成岩成矿的同源性、氧化还原环境及成因上的亲缘关系。稀土元素特征与成矿关系在∑Ｃｅ／∑Ｙ－δＥｕ图解上更能直观的体现。 相似文献
3.
江西相山火山盆地为一个塌陷式盆地,盆地内发育多个火山岩型铀矿床。课题组前期工作发现相山铀矿田中的富矿石伴生稀土资源,且为珍贵的HREE富集,在背景围岩和近矿蚀变围岩中稀土富集不明显（王倩等,2015;胡宝群等,2015）。富铀矿石中稀土元素与围岩中的稀土元素表现出明显的差异性,为进一步探明稀土元素在铀成矿过程中的地球化学行为,对矿石中的单矿物分析测试,进一步探明相山铀矿中稀土元素的富集规律及机理;同时为在铀矿选冶中,对铀矿中的稀土伴生资源加以利用回收提供相关参数,提高矿产资源的利用率,减少环境污染。 相似文献
4.
本文采用四极等离子质谱仪(ICP-MS)方法测定了可可塔勒铅锌矿矿物流体包裹体的稀土元素含量。研究表明,成矿流体稀土元素配分模式均为轻稀土富集,Eu具有明显正异常。矿石硫化物流体包裹体稀土特征具有3种稀土配分模式,即平滑右倾型、平坦型、倒“V”字型,矿体下盘围岩的稀土总量明显高于上盘围岩的稀土总量,具有明显的Eu的负异常,成矿流体具有多来源、成矿具有多阶段叠加特点,具有双淋滤模式特征。 相似文献
5.
系统地研究中国锡矿床含锡花岗岩、蚀变岩石和各种产状锡矿体中锡石的稀土元素地球化学特征，总结了含锡花岗岩成矿性评价的稀土元素地球化学定量组合标志，探讨了主要类型锡矿床的成矿物质来源和成因。 相似文献
6.
7.
试论大厂锡石-硫化物矿田围岩介质的成矿地球化学作用 总被引：1，自引：0，他引：1
大厂锡石-硫化物矿田的成矿特征显示出围岩的地球化学作甩，花岗岩侵入在厚大的富有机质地层中而处于低fo2环境，锡以二价状态不能大量进入造岩矿物才富集于岩浆热液中，至弱碱性围岩里才析出形成锡石-硫化物矿床。围岩介质不但供给了一部分成矿物质，也影响到矿物组合同位素组成、气液包裹体成分、杂质元素等规律性变化。 相似文献
8.
内蒙古大井锡多金属矿床锡矿物特征 总被引：3，自引：0，他引：3
大井锡多金属矿床含锡矿物为锡石和黄锡矿,产于3个成矿阶段和5种矿石类型中.从早到晚,即韧性变形阶段→锡石-毒砂-石英阶段→锡石-硫化物阶段(或黄铜矿-黄铁矿阶段),主要含锡矿物锡石的化学成分,表现出SnO2逐渐升高而FeO、TiO2、Nb2O5、Ta2O5和In2O5依次跳跃式递减的特征,同时NiO和Ga2O5趋于升高.与一般脉状锡矿床相比,早阶段锡石富Ta而晚阶段锡石富Ti、Fe,表明早期的锡石更接近花岗质岩浆源特征而晚期锡石则明显具层控性质.锡石的组分变化特征与各阶段(内)从早到晚成矿温度递减有关.另一含锡矿物黄锡矿含As、Zn较高,仅出现于锡石-硫化物阶段,并在温度为220℃～320℃、硫逸度为10-10.04×105～10-13.44×105Pa的特定区间内淀出.两个阶段锡石的稀土元素特征分别与矿区次火山岩和林西组地层一致,表明早期锡石-毒砂-石英阶段中的锡主要来自次火山岩(如英安斑岩),而晚期锡石-硫化物阶段中的锡可能主要来自林西组围岩(如粉砂岩). 相似文献
9.
内蒙黄岗梁矽卡岩型铁锡矿床稀土元素地球化学 总被引：15，自引：5，他引：15
黄岗梁矿床是我国北方唯一的一处锡铁共生大型矽卡岩型矿床，苏大沟是黄岗梁矿床NE向延伸的铜铅锌矿点。黄岗梁矿床围岩、蚀变围岩、赋矿矽卡岩以及不同矿体石榴子石稀土元素的总特征体现了岩浆和岩浆水、围岩和大气降水对成矿的综合影响。靠近岩体则较多地体现了岩浆和岩浆热液作用；远离岩体则围岩地层和大气降水作用增强；从贫矿体－富矿体，从早阶段到晚阶段，大气降水对成矿的贡献增大，晚期又叠加了岩浆和岩浆热液成矿作用。黄岗梁铁锡矿床的REE配分曲线类型多样、变化较大，充分显示了成矿流体的多来源和多期次叠加成矿的稀土元素特征。苏木沟铜铅锌矿点具有岩浆热液稀土元素特征。稀土元素的研究初步建立了华北北缘黄岗梁式矽卡岩型矿床稀土元素配分模式。 相似文献
10.
内蒙古安乐锡铜矿床地质特征及成因 总被引：11，自引：1，他引：11
论述了安乐锡铜矿床的矿体，矿化分带，稀土元素，稳定同位素等地质特征，探讨了矿床成因，确定锡的物质来源具有双重性，重稀土富集型锡石与花岗斑岩同源；轻稀土富集型锡石与次火山岩脉同源，矿床属燕山早期晚阶段构造动力一次火山岩浆－花岗岩浆同步一体成矿形成的中高温热液矿床。 相似文献
11.
Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
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.
Inter-regional correlation of transgressions and regressions in the Cretaceous period 总被引：1，自引：0，他引：1
T. Matsumoto 《Cretaceous Research》1980,1(4):359-373
Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous. 相似文献
13.
The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism. 相似文献
14.
正20140751 Guo Xincheng(Geological Party,BGMRED of Xinjiang,Changji 831100,China);Zheng Yuzhuang Determination and Geological Significance of the Mesoarchean Craton in Western Kunlun Mountains,Xinjiang,China(Geological Review,ISSN0371-5736,CN11-1952/P,59(3),2013,p.401-412,8 相似文献
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正20141058 Chen Ling(Key Laboratory of Mathematical Geology of Sichuan Province,Chengdu University of Technology,Chengdu610059,China);Guo Ke Study of Geochemical Ore-Forming Anomaly Identification Based on the Theory of Blind Source Separation(Geosci- 相似文献
16.
正20141334 Chen Kun(Institute of Geophysics,China Earthquake Administration,Beijing100081,China);Yu Yanxiang Shakemap of Peak Ground Acceleration with Bias Correction for the Lushan,Sichuan Earthquake on April20,2013(Seismology and Geology,ISSN0253-4967,CN11-2192/P,35(3),2013,p.627-633,2 illus.,1 table,9 refs.)Key words:great earthquakes,Sichuan Province 相似文献
17.
正20141624 Cai Xiongfei(Key Laboratory of Geobiology and Environmental Geology,Ministry of Education,China University of Geosciences,Wuhan 430074,China);Yang Jie A Restudy of the Upper Sinian Zhengmuguan and Tuerkeng Formations in the Helan Mountains(Journal of Stratigraphy,ISSN0253-4959CN32-1187/P,37(3),2013,p.377-386,5 illus.,2 tables,10 refs.) 相似文献
18.
正20142263Lü Shaojun(Geological Survey of Jiangxi Province,Nanchang 330030,China)Early-Middle Permian Biostratigraphical Characteristics in Qiangduo Area,Tibet(Resources SurveyEnvironment,ISSN1671-4814,CN32-1640/N,34(4),2013,p.221-227,2illus.,2tables,22refs.)Key words:biostratigraphy,Lower Permian,Middle Permian,Tibet 相似文献
19.
正20142560Hu Hongxia(Regional Geological and Mineral Resources Survey of Jilin Province,Changchun 130022,China);Dai Lixia Application of GIS Map Projection Transformation in Geological Work(Jilin Geology,ISSN1001-2427,CN22-1099/P,32(4),2013,p.160-163,4illus.,2refs.) 相似文献
20.
正20140692 Duo Tianhui(No.402 Geological Team,Exploration of Geology and Mineral Resources of Sichuan Authority,Chengdu611730,China);Wang Yongli Computer Simulation of Neptunium Existing Forms in the Groundwater(Computing Techniques for Geophysical and Geochemical Exploration,ISSN1001-1749,CN51-1242/P,35(3), 相似文献