共查询到20条相似文献，搜索用时 375 毫秒
1.
Gold ore districts in the Siberian (North Asian) craton and bordering terranes have been studied. Studies showed the long duration of gold concentration processes (Early Cambrian to Late Mesozoic and Cenozoic) and the influence of structural geological, magmatic, and metallogenic factors on the formation of ore districts. The largest Late Mesozoic (J–K) accumulations of gold deposits in southeastern Russia were discovered in the Aldan–Stanovoi Shield and at the northern margin of the Argun superterrane in the Aldan (Yakutia), Balei (Transbaikalia), and Gonzha (Upper Amur area) ore–placer districts.The geological and geophysical positions of these three districts have been compared. All of them are situated in zones of influence of variously trending long-lived deep faults, bordered by large Precambrian uplifts, and spatially (paragenetically) related to local magma chamber domes of Late Mesozoic (J–K) intrusive, subvolcanic, and extrusive–effusive bodies, dikes, and terrigenous pyroclastic blankets. The areas of Jurassic–Cretaceous volcanoplutonic rocks are related to the influence of the East Asian sublithospheric “superplume.”All this confirms the important ore-controlling role of large long-lived deep faults (in the form of global and regional gravity gradient zones) in the distribution of highly productive precious-metal ore–magmatic systems. This suggests that the junctions between gravity gradient zones of different trends and ranks are important to the identification of gold prospects in metallogenic prediction studies and small-scale prospecting. The Archean–Proterozoic age and the great occurrence depth of the tectonic zones suggest that extensive long-lived mobile zones (before the post-Cambrian breakup of the Siberian craton) significantly affected further evolution of the orogenic belts bordering the craton and their metallogeny, including the distribution of precious- metal deposits. 相似文献
2.
Late Mesozoic PGE, Au and U mineralization in the Precambrian Aldan Shield constitutes important ore deposits on the southern margin of the Siberian Craton. Here we provide an overview of the salient characteristics of these ore deposits and evaluate their regional geodynamic setting. Geological, geophysical, and geochronological data on the distribution and timing of the ultramafic and alkaline magmatism in the Aldan Shield and the associated Late Jurassic–Early Cretaceous PGE, Au, and U mineralization correlate with the convergence in the Asia-Pacific zone during the Late Mesozoic. The multistage magmatism and ore formation can be traced along the perimeter of the subducted slab now stagnant at the mantle transition zone, the flanks of which coincide with paleo-transform faults. Slab dehydration is considered to have transferred source metals through plume conduits resulting in the formation of productive ore-magmatic systems. 相似文献
3.
4.
5.
试论中国东部中生代成矿大爆发 总被引：143，自引：22，他引：121
中国东部在中生代尤其是燕山期发生了大规模的金属成矿作用,形成了一批重要矿床,其成矿强度之高,密度之大,矿种之丰富,在全球中生代成圹作用中首屈一指,故可称为中生代成矿大爆发。研究表明,中国东部中生代成矿大爆发是该地区在特定地质背景下下发生岩石圈大减薄和构造格局大转折相结合,从而导致大规模壳幔相互作用和构造圈热侵蚀事件的产物。深入研究中国东部中生代成矿大爆发的背景和过程,不仅能解决矿床学学院发展中的许 相似文献
6.
东南亚大型-超大型浅成低温热液金矿床成矿地质特征研究 总被引：3，自引：0，他引：3
东南亚地区地处西太平洋构造－岩浆活动带上,是中新生代以来地球岩石圈中最复杂的构造活动区之一,也是全球浅成低温热液金矿床的重要产区之一。文章介绍了东南亚地区几个浅成低温热液金矿床的成矿地质背景、矿床地质特征,分析了矿床形成环境及变化的原因、成矿物质来源和导致金在不同环境下沉淀的主要因素,并讨论了浅成低温热液矿床形成的几个问题。 相似文献
7.
I. R. Prokopyev A. A. Kravchenko A. I. Ivanov A. S. Borisenko A. V. Ponomarchuk A. I. Zaitsev E. A. Kardash A. A. Rozhkov 《Russian Journal of Pacific Geology》2018,12(1):34-45
The Dzheltula alkaline massif is located in the Tyrkanda ore region of the Chara–Aldan metallogenic zone of the Aldan–Stanovy Shield (South Yakutia). The region contains separate placer gold objects, which are being explored at the present time, and ore-bearing Mesozoic alkaline intrusions, which are weakly studied due to their poor accessibility. The Dzheltula massif (DM) is the largest exposed multiple-ring intrusion within the Tyrkanda ore region; therefore, it is considered as a typical object for geological, petrological, geochronological, and metallogenic studies. The DM consists of five magmatic phases of syenite composition. 40Ar–39Ar dating has established that the crystallization age of the oldest phase, the leucocratic syenite porphyry (pulaskite), is 121.1 ± 1.3 Ma. The crystallization age of the cross-cutting phases represented by syenite–porphyry dikes (laurvikites and pulaskites) ranges from 120.1 ± 2 to 118.3 ± 2.1 Ma. The youngest phase of the massif, trachyte, crystallized at 115.5 ± 1.6 Ma. According to the mineralogical and geochemical studies, two types of ore mineralization, namely gold and uranium–thorium–rare-earth (U–Th–REE), are established within the DM. The gold mineralization was found in the quartz–chlorite–pyritized metasomatites. It is confined to the NNE- and NNW-trending fault zones and coincides with the strike of the syenite porphyry dike belt. Uranium–thorium–rare-earth mineralization has been established in the quartz–feldspathic metasomatites localized in the outer contact of the massif. The juxtaposition of mineralization of different types in some zones of the Dzheltula syenite massif significantly increases the ore potential of the studied object within the Tyrkanda ore region. 相似文献
8.
A. A. Schneider Yu. F. Malyshev M. V. Goroshko N. P. Romanovsky 《Geology of Ore Deposits》2011,53(2):140-155
Genetic and mineralogical features of large deposits with complex Sn, W, and Mo mineralization in the Sikhote-Alin and Amur-Khingan
metallogenic provinces are considered, as well as those of raremetal, rare earth, and uranium deposits in the Aldan-Stanovoi
province. The spatiotemporal, geological, and mineralogical attributes of large deposits are set forth, and their geodynamic
settings are determined. These attributes are exemplified in the large Tigriny Sn-W greisen-type deposit. The variation of
regional tectonic settings and their spatial superposition are the main factor controlling formation of large deposits. Such
a variation gives rise to multiple reactivation of the ore-magmatic system and long-term, multistage formation of deposits.
Pulsatory mineralogical zoning with telescoped mineral assemblages related to different stages results in the formation of
complex ores. The highest-grade zones of mass discharge of hydrothermal solutions are formed at the deposits. The promising
greisen-type mineralization with complex Sn-W-Mo ore is suggested to be an additional source of tungsten and molybdenum. The
Tigriny, Pravourminsky, and Arsen’evsky deposits, as well as deposits of the Komsomol’sk and Khingan-Olonoi ore districts
are examples. Large and superlarge U, Ta, Nb, Be, and REE deposits are localized in the southeastern Aldan-Stanovoi Shield.
The Ulkan and Arbarastakh ore districts attract special attention. The confirmed prospects of new large deposits with Sn,
W, Mo, Ta, Nb, Be, REE, and U mineralization in the south of the Russian Far East assure expediency of further geological
exploration in this territory. 相似文献
9.
Mineralization Ages of Gold-Hydrothermal Deposits in Northern Zone of Eastern Kunlun Mountains based on Fission Track Analysis 总被引：2，自引：0，他引：2
MINERALIZATION AGES OF GOLD-HYDROTHERMAL DEPOSITS IN NORTHERN ZONE OF EASTERN KUNLUN MOUNTAINS BASED ON FISSION TRACK ANALYSIStheOpenLaboratoryofNuclearAnalysisTechniques;;ChineseAcademyofSciences 相似文献
10.
Ｗｕｌｏｎｇｇｏｕｇｏｌｄｄｅｐｏｓｉｔｉｓａｌａｒｇｅ,ｔｙｐｉｃａｌｔｅｃｔｏｎｏａｌｔｅｒ－ａｔｉｏｎｇｏｌｄｄｅｐｏｓｉｔｄｉｓｃｏｖｅｒｅｄｉｎ１９８０ｓｉｎＥａｓｔＫｕｎｌｕｎ,Ｑｉｎｇ－ｈａｉＰｒｏｖｉｎｃｅ．Ｔｈｅｒｅｆｏｒｅ,ｉｔｓ... 相似文献
11.
12.
M. V. Goroshko V. B. Kaplun Ya. F. Malyshev N. P. Romanovskiy V. G. Gurovich 《Russian Journal of Pacific Geology》2010,4(4):275-288
Aerogeophysical and gravimetric survey data on the Central Aldan block, Aldan-Stanovoy shield have been summarized; a map
of the extensiveness of the Precambrian granitoid magmatism has been drawn; the association of ore districts encompassing
large deposits with the margins of the extensive areas of Precambrian granitoids has been recognized; the 3-D density modeling
of the lithosphere of this block has been accomplished; the roots of the Mesozoic alkaline massifs down to a depth of 100–150
km have been traced, and the telemagmatic nature of the large gold-uranium deposits related to these massifs has been defined. 相似文献
13.
冈底斯成矿带东段矿床成矿规律及找矿预测 总被引：9，自引：0，他引：9
根据全国重要矿产潜力评价项目成矿规律研究之成果,开展综合分析,将冈底斯成矿带东段划分为驱龙-甲玛铜多金属矿集区等13个矿集区,确定了主要矿集区中重要矿床的矿床类型,总结了矿床时空分布和矿床组合等方面成矿规律,完善了矿床成矿系列、亚系列和矿床谱系,建立了中新世斑岩-矽卡岩型铜多金属矿的控岩控矿模式.提出燕山晚期—喜马拉雅早期冈底斯中部中酸性岩浆岩接触带似IOCG型铁铜金矿、早中侏罗世—中新世斑岩型铜矿外围的浅成低温热液金矿、与剪切带有关的构造蚀变岩型金矿等是冈底斯成矿带东段下一步找矿的重要矿床类型. 相似文献
14.
《International Geology Review》2012,54(11):1006-1007
The considerable gold resource potential in China has been increasingly recognized in recent years, following detailed geological investigation of the major orogenic belts since the 1980s. The major tectonic components of China include the Sino-Korean, Yangtze, Tarim, and Cathaysian Precambrian platforms surrounded by the Altaides, Tianshan-Inner Mongolia, Daxinganling, Alkin, Kunlun, Qilian, Qinling, Himalaya-Tethys, and Nanling orogenic belts. A large number of gold deposits and geochemical anomalies have been discovered in all of these lithotectonic provinces. The most important deposit types are Precambrian lode, Carlin-type, ophiolite-related, porphyry-related, volcanic epithermal, and possible Muruntau-type gold deposits, occurring mainly in seven major metallogenic districts in eastern and southwestern China. Many lithotectonic belts provide favorable locations for the formation of various large gold deposits and are comparable with other productive gold provinces of the world, such as the Canadian Shield and Circum-Pacific magmatic arcs. The geochemical anomalies and many existing gold deposits and metallogenic belts in China require additional detailed study on the basis of modern exploration technologies. 相似文献
15.
16.
中国东部环太平洋带某些非金属矿的分布规律 总被引：2，自引：1，他引：2
一、地质背景中国东部环太平洋带某些非金属矿的分布规律是由中国大陆板块的地质发展历史所决定的。中国大陆板块是现代欧亚大陆板块的一个组成部分,但在地质历史中它有着自己的发展特点,可视为一个独立组成部分。以天山—阴山、昆仑山—秦岭—大别山、唐古拉山—横断 相似文献
17.
中国钼矿床的时空分布及成矿背景分析 总被引：5，自引：0，他引：5
我国钼资源十分丰富,目前已发现钼矿床四百余个,它们具有成带分布的特点。本文在钼矿床地质特征基础上,系统总结了钼矿床和含钼矿床的成矿年代(依据辉钼矿Re-Os年龄),结果显示我国钼矿床空间上可分为东秦岭-大别、兴-蒙、长江中下游、华南、青藏和天山-北山六大钼成矿带;成矿时代上,钼成矿作用分为古元古代(1882~1804Ma)、早古生代(480~420Ma)、晚古生代(412~260Ma)、中生代印支期(251~209Ma)、中生代燕山期(194~77Ma)和新生代(65~13Ma)等六个阶段,主要集中于中生代和新生代。元古宙形成的钼矿床分布于东秦岭-大别钼成矿带,古生代钼矿床主要分布于天山-北山钼成矿带,中生代钼矿床在中国东部广泛分布,新生代钼矿床全都分布于青藏钼成矿带。我国古元古代钼矿床(1882~1804Ma)形成于古陆块之间俯冲碰撞背景下的岛弧环境(东秦岭-大别);早古生代钼矿床(480~420Ma)形成于不同构造单元由挤压向伸展转换的岛弧或陆缘弧环境(东秦岭-大别、兴-蒙和华南);晚古生代钼矿床(412~260Ma)形成于古亚洲洋壳俯冲的岛弧环境(兴-蒙);中生代印支期钼矿床(251~209Ma)形成于板块碰撞及后碰撞背景(东秦岭-大别、兴-蒙和天山-北山)或洋壳俯冲的背景(青藏);燕山期钼矿床形成于古太平洋板块俯冲转向及其后伸展体制下岩石圈减薄拆沉环境(东秦岭-大别、兴-蒙、长江中下游和华南),燕山晚期钼矿床(85~77Ma)形成于碰撞后的伸展背景(青藏);新生代(65~13Ma)钼矿床形成于印度板块与欧亚板块陆陆碰撞及其后的伸展背景(青藏)。我国钼成矿作用受到了环太平洋构造带(东秦岭-大别、兴-蒙、长江中下游和华南)、中亚造山带(天山-北山、兴-蒙)和特提斯构造带(青藏)三大构造体制的影响。 相似文献
18.
辽东地区金矿床类型、成矿特征及找矿潜力 总被引：3，自引：1，他引：2
辽东地区是我国重要的金矿集区之一,中生代构造、岩浆活动强烈,并伴生强烈的金成矿作用。根据金矿床时空分布及成矿特征,将辽东地区划分为三个金矿集区:青城子、五龙、猫岭。矿集区内金矿包括石英脉型金矿和蚀变岩型金矿这两种类型,并分别受高角度断裂和低角度断裂构造体系控制。辽东地区金矿成矿时代主要为早白垩世,少量早侏罗世。已有H-O同位素、成矿流体及地质研究表明:(1)区内金成矿与中生代岩浆活动有关、受断裂构造控制,并以强烈硅化-绢云母化为特征标志;(2)区内金矿床属于岩浆热液型矿床;(3)充填作用和混合作用可能是辽东地区金矿床成矿物质沉淀的机制。辽东地区金矿成矿系统按其产出环境及特点,可分为两个亚系统:产于中生代花岗质岩体内岩浆热液金成矿系统(五龙式)及产于古元古代变质岩中岩浆热液金成矿系统(青城子式、猫岭式)。结合区域找矿进展和近期研究工作,建立了辽东地区金矿找矿预测地质模型,认为本区具有与胶东地区相似的金矿成矿条件,成矿潜力巨大,研究工作对区域矿产勘查部署工作有指导意义。 相似文献
19.
辽南丹东地区中生代金成矿的FIP的证据 总被引：10，自引：3，他引：7
辽南丹东地区产出有五龙、四道沟两个大型金矿床,两矿床与中生代燕山期三股流花岗岩体存在密切的空间华生关系。长期以来,对这一地区金的成矿作用时代存在有不同的认识,一种观点认为金的成矿作用只有一期,即中徨代（燕山期）;另一种观战认为金的成矿作用有两期,即元古代和中生代（燕山期）分别以四道沟金矿和五龙金矿为代表,作者利用流体包裹体面（ＦＩＰ）研究的新方法对金矿床及伴生花岗岩进行了研究。结果表明,三股流花岗 相似文献
20.
河南省祁雨沟地区金矿物探找矿方法应用研究 总被引：5，自引：0，他引：5
通过以祁雨沟地区爆破角岩型金矿和构造破碎蚀变岩型金矿物探工作的综合分析，结合地质、物化探工作，提出了在该区寻找这两种类型金矿（脉）的找矿标志和工作方法。利用已知矿区的勘查验证结果，结合地物化异常标志，对矿区外围的找矿工作提出了建议。 相似文献