共查询到18条相似文献，搜索用时 375 毫秒
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太行山北段阜平幔枝构造成矿作用研究 总被引：3，自引：0，他引：3
阜平幔枝构造北东倾伏端，是轴部乌龙沟－上黄旗韧脆性剪切带与外围主拆离滑脱带的交汇部位，断裂构造发育，岩浆活动强烈，成矿控矿有利，矿床类型多样。笔者以上明峪主拆离滑脱带型金矿、镰巴岭上盘盖层裂隙型铜铅锌矿和支家地上叠断陷盆地中次火山岩裂隙型银矿为例，讨论了幔枝构造外围主拆离滑脱带、上盘盖层密集裂隙带和上叠断陷盆地次火山岩构造的成矿控矿作用，总结成矿规律，归纳成矿模式。 相似文献
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文章简要介绍了幔枝构造成矿理论，探讨了幔枝构造的特征、单元划分、断裂构造体系以及成矿控矿作用。在燕山运动晚期，华北东部地区进入了以伸展构造为主的地幔热柱演化阶段，在胶西北地区形成了莱阳地幔亚热柱及其外围郭家店、栖蓬、牟乳等幔枝构造。其中，郭家店幔枝构造于燕山运动晚期发生强烈的构造活动，总体形成了以焦家断裂为主的拆离带和与其相交的以三山岛断裂为反向铲状断裂的构造体系，同时控制着玲珑、焦家、三山岛等一系列大型—超大型矿床的形成。在众多成矿控矿因素中，区域性断裂构造是重要的主导性因素，既为成矿流体的运移提供了通道，又为成矿储矿提供了有利空间。深源含矿流体可通过地幔热柱→地幔亚热柱→幔枝构造→有利构造扩容带，即脆韧性-韧脆性剪切带、侵入岩体的内外接触带、密集的构造裂隙带、各种脉岩与围岩的接触带等有利构造部位集聚成矿。近年来在胶西北深部勘查发现，浅部沿断裂展布的若干个大—中型金矿在其深部的成矿蚀变构造带可能是连为一体的，一起组合成为超大型金矿。 相似文献
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The Zhangjiakou-Xuanhua area is a mineral resource-concentrated area for gold-silver polymetallic ore deposits. The temporal and spatial distribution and origin of mineral resources have been argued for a long time. Based on the comprehensive studies of geochronology and sulfur, lead, oxygen, carbon and noble gas isotopes, it is considered that the temporal and spatial distribution of mineral resources in this area is obviously controlled by the Zhangjiakou-Xuanhua mantle branch structure, as is reflected by the occurrence of gold deposits in the inner parts and of Ag-Pb-Zn polymetallic ore deposits in the outer parts. The mineralization took place mainly during the Yanshanian period. Ore-forming materials came largely from the deep interior of the Earth, and hydrothermal fluids were derived predominantly from Yanshanian magmatism. 相似文献
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NIU Shuyin CHENG Guangsuo ZHANG Jianzhen SUN Aiqun MA Baojun ZHANG Fuxiang WANG Baode XU Meng WU Jichun ZHAO Rongxin WANG Shanfei 《《地质学报》英文版》2014,88(5):1409-1420
The northwest of Jiaodong peninsula is characterized by its greatest gold concentration area, enormous gold reserves and limited time interval （115±5Ma） of gold mineralization in China. Studies show that the east area of north China began its mantle plume evolution since the Yanshanian movement, and the Laiyang sub-mantle plume and its surrounding mantle branches such as those in Guojiadian, Aishan and Panshidian were formed in the mineralization concentration area of northwestern Jiaodong peninsula. With the development of mantle plume →sub-mantle plume → mantle branch→ favorable expending structures, the deep-derived hydrothermal fluid moved up to the favorable places, such as brittle-ductile or ductile-brittle shearing zones, the internal and external contact zones of intrusions, dense fracturing zones and the contact zones between dikes and countryrocks, and concentrated into deposits. Then the gold mineralization concentration zones that are centralized on mantle branches were formed. This study takes Guojiadian mantle branch as an example to discuss their metallogenetism and conclude the metallogenetic mode. 相似文献
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Baode Wang Shuyin Niu Aiqun Sun Yaming Liu Yan Xie Xiaoping Jiang Yongli Zhao Yincang Gao Fuwang Zhao 《中国地球化学学报》2010,29(3):270-277
This study was conducted following research on metallogenesis in the Zhangjiajie-Xuanhua and East Hebei mantle branch structure zones. The Fuping mantle branch structure zone is one where Au, Cu and Ag polymetallic ore resources are concentrated in North Hebei. However, there has existed a long-standing controversy on the temporal-spatial distribution of ore resources and their ore-forming material sources. In terms of age dating and the comprehensive analysis of S, Pb, O, C and Si isotopes, it is considered that the temporal-spatial distribution of ore resources in this mantle branch structure zone is obviously controlled by the Fuping mantle branch structure. In space there is developed such a metallogenic pattern as to be Ag, Pb and Zn polymetallic ore deposits with gold appearing inside and copper appearing outside. Metallogenesis is dated mainly at Yanshanian, the ore-forming mate-rials were derived predominantly from the deep interior of the Earth, and ore-forming fluids were derived largely from Yanshanian magmatism. 相似文献
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磨坊沟式金矿是指鲁西铜石地区赋存在早寒武世朱砂洞组灰质白云岩和白云质灰岩中的碲金矿床，近期地质勘查表明，矿体产出层位相对稳定，分布面积较广，矿化较为连续，具有很大的资源潜力和找矿远景。其围岩具明显的黄铁绢英岩化、高岭土化、方解石化和萤石化。碲金矿的形成与黄铁绢英岩化密切相关。矿床产出的构造部位为鲁西幔枝构造核部，铜石隆起外围太古宙结晶基底与寒武纪盖层间主拆离带之上的次级拆离带中。成矿物质来自深源（地幔），矿体就位受主、次级拆离滑脱带控制。由于次级拆离带断坪顺层展布，故矿体亦表现出似层状特征。 相似文献
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大井铜锡多金属矿以矿床规模大、伴生元素多、矿脉展布窄而密集、品位较高而著称。但是,矿区范围勘探并没有发现燕山期岩体,矿床成因众说纷纭。笔者从幔枝构造视角研究认为,矿区位于大兴安岭幔枝构造核部,地幔热柱多级演化沟通了深部含矿流体,并沿途萃取部分成矿物质,在有利的成矿构造裂隙中集聚成矿。而成矿控矿裂隙的方向性则与成矿阶段区域构造应力场密切相关。至于在矿区内部的Sn、Cu、Au、Ag、Pb、Zn成矿元素的分带性,应与成矿作用及成矿物质结晶温度有关,结晶温压条件较高的Sn、Cu、Au等元素矿化多位于矿区中部,而结晶温压条件较低的Ag、Pb、Zn等元素矿化则多位于矿区的外围。 相似文献