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江西大背坞金矿成因探讨 总被引：1，自引：0，他引：1
从硫同位素、铜同位素、硅同位素、碳同位素及稀土元素特征等方面资料反映出大背坞金 成矿物质来源具有双桥山群地层为主，并有燕山期岩浆物质加入的双重特征；从成矿流体包裹体特征分析成矿流体主要来源于岩浆水；成矿蚀变矿物的铷－锶同位互获得等时线年龄为１１８Ｍａ；结合构造演化与构造控矿规律提出了大背坞金矿床因新认识，即属于受构造控制的中高湿岩浆热液矿床。 相似文献
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原生金矿成矿年龄测定研究 总被引：1，自引：0，他引：1
金成矿年龄和矿源同位素组成的准确测定，对金矿地质研究和找矿具有重要意义。本文根据３年多野外和室内工作的总结，获得了多个典型矿床的年龄和同位素测定结果：华北古陆北缘北侧槽区乌花敖包金矿测定为１３０—１２０Ｍａ的晚期造山作用成矿；南侧台区赛乌素金矿为２１１±１５Ｍａ的再循环古陆改造成矿；中段台区后沟一黄土梁金矿为２４３±７Ｍａ的古陆再造成矿；胶东焦家－乳山金矿为１２２．７±３．４Ｍａ和１２８±２３Ｍａ的燕山期成矿；华夏古陆八宝山金银矿为１４０±５Ｍａ的火山热液成矿。 相似文献
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夏杖子金矿床中矿物包裹体水的氢、氧同位素分别为：δD=-91.7‰——73.1‰，δ18OH2o=5.68‰-6.23‰，说明读矿床的成矿溶液是来源于岩浆水和大气降水；矿物的硫同位素组成基本上全是负值，且变化范田较小，同位素平衡温度平均为208-240℃，成矿溶液总硫平均同位素组成-19.70‰——20.64‰，证明成矿热液中H2S原子团占优势，其硫源可能为本区结晶基底；石英中流体包裹体Rb-Sr同位素等时年龄为105±7.2Ma，说明其成矿时代为燕山晚期。综合分析认为，该矿床为与岩浆热液有关的中-低温热液脉型金矿床。 相似文献
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内蒙古柳坝沟一哈达门沟金矿田是华北地台北缘成矿带上的一处以广泛发育钾长石化为特色的超大型金矿田。本文在成矿地质条件分析的基础上,系统研究了柳坝沟、哈达门沟金矿床的氢、氧、碳和硫同位素组成特征,探讨了成矿热液类型和成矿物质来源。研究表明,成矿热液早期以岩浆水或初始岩浆水为主,后期有部分大气降水的加入,且柳坝沟金矿床中大气降水的参与程度更高。热液中碳主要为深源岩浆来源。矿石中硫化物的硫同位素组成特征反映了硫具有地层和岩浆的混合硫特征。柳坝沟金矿床的δ34S值低于哈达门沟金矿床;哈达门沟金矿床东段的δ34S值低于西段,可能反映了柳坝沟金矿床较哈达门沟金矿床剥蚀程度小,哈达门沟会矿床东段较西段剥蚀程度小。 相似文献
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本文研究了栖霞地区金矿床的硫、氧、铅等稳定同位素组成特征，指出区内金矿的成矿物质主要来源于胶东群地层，成矿热液是以变质热液为主、有岩浆热液和大气降水参与的沸合热液；成矿温度在160℃－305℃范围内，属中低温热液矿床。金矿床的铅－铅模式年龄为800.1-1200.88Ma。 相似文献
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提要：陕西双王金矿床位于西秦岭凤太矿集区东部,为一大型含金钠长角砾岩型金矿床。矿床赋存于上泥盆统星红铺组,为一套由钙质粉砂岩、粉砂质绢云板岩和灰岩组成的类复理石沉积建造。金矿体明显受角砾岩体控制,呈断续带状分布,矿石硫化物主要为黄铁矿,主要围岩蚀变类型为钠长石化。矿床稳定同位素地球化学特征研究表明：早阶段和主阶段成矿流体以岩浆热液和建造水的混合热液为主,晚阶段由岩浆热液向大气降水热液演化;碳主要来源于深部,并混有碳酸盐岩地层溶解形成的碳;硫具有地壳硫和岩浆硫混合来源的特征;铅的来源以上地壳为主,并混有少量地幔铅。结合区域地质构造背景,认为双王金矿床成矿作用与始于印支晚期的陆内碰撞造山作用有关,成矿过程经历了隐爆前的热液交代成矿期和隐爆后的热液充填成矿期,其中隐爆后的热液充填交代阶段是金矿床的主要成矿阶段,双王金矿床成因类型为隐爆角砾岩型金矿床。 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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K.Naganjaneyulu 《地学前缘(英文版)》2014,5(1):1-2
正The Precambrian shields and associated suture zones of the globe preserve important records of continental growth and destruction,the formation and closure of ocean basins,and the early evolution of the Earth in terms of tectonics,resources,and environment.They also offer critical clues on the nature and style 相似文献
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Daniel Harlov 《地学前缘(英文版)》2014,5(5):621-625
正1.Introduction This special issue of Geoscience Frontiers is a tribute volume honoring the life and career of Jacques Touret.A set of research papers has been assembled,which broadly reflect his research interests over his 50 plus year career.These papers focus on the role that fluids play during the formation and evolution of the Earth's crust.Below I provide a brief summary of the life of Jacques Touret,along with a select bibliography of his more important papers.This is then followed by a brief introduction to the papers assembled for this special issue. 相似文献
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《地学前缘(英文版)》2014,(1):139-141
正1 AIM AND SCOPE GEOSCIENCE FRONTIERS(GSF)is a bi-monthly international journal that publishes in English high quality original research articles and timely reviews in interdisciplinary fields of Earth and Planetary Sciences.GSF aims to bridge innovative,provocative and challenging concepts and models related to various fields of research including petrology and geochemistry in understanding lithospheric architecture and mantle dynamics,global tectonics,economic geology and fuel exploration,geophysics,stratigraphy and paleontology with new 相似文献
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正The world petroleum exploration suggests that,about70%of the world’s potash resources were discovered during oil and gas exploration(Zheng et al.,2007).The Kuqa depression in the Tarim basin is abundant with petroleum exploration data,and 相似文献
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正Qarhan Salt Lake is located in the eastern part of the Qaidam Basin,which is first discovered the large potash deposit in the late 1950s.The Bieletan section is located in the west of Qarhan Salt Lake,where saline sediment 相似文献
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正With the approach of the 45th World Earth Day,China’s Ministry of Land and Resources issued the status of the Chinese geological survey and environments on 22nd April 2013.Regional geological survey in 2013 achieved new results—(why was oceanic in twice?)polar and oceanic expedition were fully completed,a national census of geography was begun,and 相似文献
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正1 Introduction The Lop Nor playa,located in the eastern end of the Tarim Basin,capped with a thick salt crust covering an area of approximately 5,500 km2(Ma 2007)that closely resembles a"Great Ear"in satellite images.Understanding the formation of the salt crust can provide important 相似文献
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In Liaoning, Hunan, Guangxi, Guizhou, Gansu, Sichuan, Anhui, Jilin and other provinces in China, there is a wide occurrence of metal quantity over 1000 tons of refractory gold ores, principally because of low gold recoveries and become ＂stay mine＂. Features of refi＇actory gold ores are： gold in micro-particles or a microscopic state that is wrapped in pyrite, presence of arsenopyrite and other sulfide minerals or disseminated in the crystal lattice of sulfide minerals; harmful impurity elements such as arsenic, carbon, mercury, antimony, copper with high content are closely related with the gold, and these elements affect the contact reaction between the gold and solvent extraction, making the recovery of the gold extraction process low. In the past 20 years, overseas countries have developed the application of the roasting oxidation method, hot acid （alkali） oxidation, bacterial oxidation and flash chlorination oxidation technology to solve this problem.Among these, biological oxidation has developed rapidly in the domestic market and gold enterprises abroad because of its low investment in infrastructure, low production costs, less environmental pollution, simple process and easy control, etc. 相似文献