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西藏勒青拉铅锌矿床稀土元素地球化学特征 总被引：5，自引：0，他引：5
文章通过对西藏勒青拉铅锌矿床稀土元素的研究,判定矿石与地层(灰岩)有着相同的稀土元素特征,同时矿石与岩浆岩也有着密切的关联.夕卡岩全岩的稀土元素分布模式表现出承袭了围岩的分布模式,与长江中下游地区的夕卡岩矿床相比表现出截然不同的特征,造成这一现象的主要原因可能是由于岩体距碳酸盐岩地层(围岩)较远,热液需经过构造等通道的远距离运移后才能流经围岩并与其发生接触交代作用,而在接触交代作用过程中,热液又萃取了大量地层中的成矿物质所造成.稀土元素相关的特征值变化表明在成矿过程中,成矿温度逐渐降低,成矿环境从相对还原条件向相对氧化条件改变. 相似文献
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本文对勒青拉铁铅锌矿床形成的地质背景、矿床地质特征、成矿控矿因素和成矿模式进行了研究。研究结果表明:矿床位于冈底斯成矿带东段北矿带,铁、铅锌矿体主要呈层状产出,严格受碳酸盐岩层位及其层间破碎带的控制,成矿作用与同碰撞期居布札日花岗闪长岩(45Ma)的接触交代作用密切相关;铜铅锌矿体呈脉状产于正断层破碎带中,成矿作用与后碰撞期闪长玢岩(38.8Ma)的岩浆热液充填有关。认为勒青拉矿区深部具有铜多金属矿的找矿潜力,同时对冈底斯成矿带东段北矿带晚碰撞期花岗岩(40～25Ma)成矿作用的重要性应予以重视。 相似文献
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西藏冈底斯成矿带是位于雅鲁藏布江结合带与班公湖—怒江结合带之间的世界级巨型铜多金属成矿带。冈底斯成矿带中铅锌矿床主要有夕卡岩型(接触交代夕卡岩型和层控夕卡岩型)和充填热液脉型2类,矿床的形成与岩浆活动关系密切,成矿时代分为中生代燕山晚期((157.41±1.20)Ma)、新生代喜山早期(65～40Ma)和喜山晚期(25～10Ma)等3期。其中,喜山早期为夕卡岩型铅锌矿床最重要的成矿期,喜山晚期为充填热液脉型铅锌矿床的主成矿期。赋矿地层主要为晚古生代石炭-二叠系,其次为中生代侏罗系—白垩系。矿床具有呈EW向带状、SN向串状分布的特征,在局部构造单元内矿床呈丛聚性分布规律。重要的地质事件控制着矿床的形成,是2期或多期地质事件联合作用的结果。层控夕卡岩型铅锌矿是冈底斯成矿带的重要矿化类型之一,往往由热水沉积作用、多期构造改造及岩浆热液活动相互叠加富集而成。 相似文献
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大宝山多金属矿床成矿条件及矿床成因探讨 总被引：2，自引：0，他引：2
大宝山是一个典型的复成矿床。按成矿条件分两个成矿系列:一是产在次英安斑岩岩墙上盘中泥盆统东岗岭组地层中的沉积成矿热液改造型铜铅锌多金属矿床;二是产在花岗闪长斑岩体内外接触带上的斑岩型或夕卡岩型钨钼矿床。本文仅讨论层状多金属矿床的成矿控制条件及矿床成因。 相似文献
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小康锰银多金属矿受下三叠系溪口组地层、断裂构造破碎带和花岗斑岩接触带控制,氧化锰(银)矿床属"淋积型",含锰层经热液叠加改造和风化淋滤后在层间断裂破碎带中富集成矿;铜铅锌矿体分布于酸性偏中性的花岗岩体外接触带中(部分为层状夕卡岩),呈浸染状赋于夕卡岩中或沿裂隙充填成矿.主要围岩蚀变有夕卡岩化和角岩化.该矿床从上至下具Mn(Fe)-Ag,Pb,Zn-Cu,Pb,Zn的垂直分带规律. 相似文献
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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
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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
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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
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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
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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
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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
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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
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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
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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