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通过柴窝堡铜矿带区域沉积环境、构造环境及岩浆活动分析，认为矿带具备铜矿成矿地质条件．具体阐述了铜沟─庙儿沟铜矿田的成矿地质地球化学特征和矿化富集规律，认为铜沟─庙儿沟铜矿区的矿床属沉积─热液叠加改造型层控矿床． 相似文献
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三保银矿是近年新发现的多金属矿床,已初具中型规模,可望发展成为大型矿床。通过矿床地质特征的研究,提出了“层－构－岩－相”五字控矿规律,认为该矿床具有层控性、多源性和多期次的成矿特点,应属变质－岩浆热液叠加改造型层控矿床。床具有层控性、多源性和多期次的成矿特点,应属变质－岩浆热液叠加改造型层控矿床。 相似文献
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贵州独山巴年锑矿床地质特征及成矿条件探讨 总被引：1，自引：0，他引：1
本文从地质和地球化学角度对巴年锑矿床地质特征及春成在放条件进行了分析。指出该矿床的锑和硫主要来自矿源层；锑矿受层位、构造控制；成矿流体来自于大气降水，具低温和中低盐度性质；矿床属典型沉－强改造型层控矿。 相似文献
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论栾川南泥湖钼（钨）矿田成矿规律及找矿方向 总被引：4，自引：0，他引：4
本文根据已有资料和区域地质情况，通过对区内钼（钨）矿田各矿床（点）质特征和控制因素的综合分析研究，并结合近几年大量的实际开采情况，运用本红铁钼（钨）成矿地质理论，有我对性地分析了黄级岭－竹园沟－带与钼（钨）矿化有拳各种地质因素，深入探讨了区内钼（钨）矿 成矿规律，成矿系列和成矿机制，于库－竹园沟和黄背岭－榆木沟洼带的成矿有利地质水且有岩浆水与雨水的混入根据区域地质条件，结合物化探成果资料，进行了分 相似文献
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文章论述了垭都-蟒硐铅锌成矿带成矿地质务件,断层控岩、控矿特点.从区域地质地球化学背景、典型矿床产出特征,总结了垭都-蟒硐断裂带铅锌成矿规律.找矿实践证明,垭都-蟒硐断裂带内铅锌矿体主要呈陡脉状产出,旁侧次级断裂带中则呈层状产出;断层活动强度与铅锌矿化常成正相关关系;成矿地质条件、物化探异常特点、铅锌矿化富集特征显示,垭都、筲箕湾、羊角厂矿区深部及外围具备寻找大型铅锌矿床的潜力. 相似文献
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The Songqi region, SW Henan, is an important bauxite province in China. The bauxite ore deposits occur unconformably on the top of Middle Ordovician argillaceous carbonates. The bauxite ores from the Songqi region are characterized by unusually high boron contents. In this paper, we report the mineralogical and chemical compositions of selected bauxite ores from the region. These new data, together with existing geochemical data of soils in the region, are used to evaluate the origin of boron enrichment in the bauxite ores. The compositional characteristics of tourmaline in the bauxite ores suggests that this mineral was likely derived from a meta-sedimentary protolith. Mass balance calculation reveals that tourmaline only accounts for a small portion of boron in the bauxite ores; the majority of boron in the ores must occur in other forms, possibly by ion absorption on the surfaces of diaspore and clay minerals. In the Songqi region, the Precambrian meta-sedimentary rocks are known to contain abundant tourmalines whereas the Cambrian–Ordovician argillaceous carbonates and the Upper Proterozoic shales are all enriched in boron in free ion state. We suggest that these rocks provided tourmaline and boron ion to the bauxite deposits in the region. Most known bauxite deposits in the Songqi region occur at the margins of boron-rich soil domains, suggesting that boron in soils is a potential exploration indicator for unknown bauxite deposits in this region. 相似文献
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青藏高原火山-沉积硼矿找矿的新发现与远景分析 总被引：1，自引：0，他引：1
本文报道了青藏高原火山-沉积硼矿找矿的新成果,首次发现和确认在青藏高原存在富硼的火山-沉积二元结构的地层,其构造位置、岩石地层组合和时代与同一成矿带西部的安纳托利亚高原的大型火山-沉积硼矿床都一致,且地层的稀碱金属元素含量高正异常,并已发现有团块或条带状的钠硼解石和硼砂等硼酸盐矿物,局部硼含量达边界品位。说明雄巴盆地具备形成火山-沉积硼矿床的构造地质、岩石矿物和地球化学的先决条件,具有形成大型火山-沉积硼矿的潜力。该发现是我国突破大型火山-沉积硼矿的先导性成果,为在青藏高原找寻该类型硼矿床提供重要科学依据。 相似文献
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辽东硼矿的成矿机制及成矿模式 总被引：7，自引：0，他引：7
为了解辽东硼矿的成矿机制及建立成矿模式, 分析了含硼岩系、镁质容矿岩石、区域变质作用及混合岩化作用、构造等四大控矿因素, 发现含硼岩系具富硼特征, 容矿岩石具富镁特点并可成为硼质的沉淀剂, 含硼岩系中硼在区域变质和混合岩化过程中得到进一步活化形成含硼热液, 含硼热液在有利的构造空间交代镁质岩石即可形成镁硼酸盐型硼矿.含硼岩系、镁质容矿岩石是硼矿形成的物质基础, 区域变质及混合岩化作用、构造活动是硼矿形成的必要条件.辽东硼矿成矿模式为原始火山-沉积初始富集和部分熔融含硼热液交代镁质岩石. 相似文献
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后仙峪硼矿区硼矿地质特征及其成因探讨 总被引：4，自引：0，他引：4
应用美国GoldenSoftware公司最近出品的Surfer8三维软件包将后仙峪硼矿区钻孔及坑道资料编成含矿层B2O3含量等值线图、含矿层厚度等值线图以及底板等高线图等图件,并相互比较,综合研究,得出该硼矿区硼矿含矿层具有分带性与分段性,厚度受方向控制,矿体受构造上的转折端控制等地质特征.结合分析该硼矿区的地质成因,将该硼矿区划分为3个带,又将第3带划分出3个段作为预测区(A、B、C).基于此,将B预测区作为重点远景区,于2002年钻探验证中,在数百米的角闪质混合岩盖层下发现了品位高、厚度大的隐伏硼矿,即二道沟硼矿,取得了寻找隐伏矿体的重大突破,且为在该区进一步寻找隐伏硼矿打下了良好的基础,极大地扩大了该区的找矿前景. 相似文献
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硼在自然界有两种稳定同位素11B和10B,常采用δ(11B)/10-3来表示不同地质体的同位素组成。由于硼同位素在不同地质体中的分馏作用大,在较大温度范围内岩浆-热液流体中的高活动性和化学性质稳定等方面的优势,使硼同位素在地球科学研究中的作用越来越广泛。控制硼同位素分馏的主要因素是硼源。一般情况下,非海相的硼酸盐矿物和与之相关的电气石的δ(11B)值为负值,而在某些盐湖卤水和与海相环境有关的硼酸盐矿物的δ(11B)值则为正值。目前,硼同位素示踪主要应用于块状硫化物矿床、与花岗岩有关的热液矿床以及盐湖矿床的研究。随着硼同位素分馏机制及其在不同环境地质样品中分布特征的深入研究,硼同位素在解决矿床的成矿物质来源、矿床成因和成矿作用等方面将发挥更大的作用。 相似文献
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In the eastern Sierras Pampeanas, Central Argentina, tourmalinites and coticules are found in close association with stratabound scheelite deposits in metamorphic terranes. In Sierra Grande (Agua de Ramón and Ambul districts) and Sierra de Altautina, tourmalinites are associated with stratabound scheelite deposits related to orthoamphibolites. In the Pampa del Tamboreo area, tourmalinites are located in biotite schists stratigraphically related to acid to intermediate metavolcanic rocks and scheelite-bearing quartzites.The mineral chemistry and boron isotopic compositions of tourmalinite-hosted and vein-hosted tourmalines are investigated. Overall, the tourmalines belong to the dravite-schorl series and are generally aluminous; Fe/(Fe+Mg) ranges from 0.33 to 0.85, Al/(Al+Fe+Mg) from 0.66 to 0.76 and the amount of X-site vacancy (0.12–0.48) indicates significant foitite components. Their boron isotopic compositions (δ11B) are from −24.0‰ to−15.0‰.Similar mineral chemistries and boron isotopic values for tourmaline in tourmalinites related to stratabound scheelite mineralisation and in tungsten-bearing quartz veins suggest a common source for the boron and probably the tungsten. The field, chemical and isotopic relationships are consistent with tungsten and boron in quartz-vein deposits being remobilised from stratabound scheelite and tourmalinite, dominantly by liquid-state transfer associated with regional shear zones. Tungsten and boron in the original sedimentary sequence (now meta-exhalites) are ascribed to volcanogenic exhalations. 相似文献
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辽东地区沉积变质硼矿床及硼同位素研究 总被引：2，自引：2，他引：2
辽东地区元古界硼矿床属于沉积变质硼矿。根据现代盐湖沉积 ,认为硼矿物沉积通常为硼砂 ,然后在区域变质作用过程中 ,硼砂矿物转变为硼镁矿物或硼铁矿等硼酸盐矿物 ,但辽东硼矿床中不同硼矿物的硼同位素有一定差别。电气石富10 B ,δ11B值较低或呈负值 ;而硼镁石与硼镁铁矿类矿物明显富集11B ,δ11B值较高 ,为 +2 3‰～ +17 4‰。根据水岩作用过程中硼同位素分馏特征的研究 ,11B与10 B比较有下列 4个特征 :( 1) 11B属于极不相容元素 ,优先进入水相 ,因此在变质残余矿物相中形成低的δ11B值 ;( 2 )在蚀变和交代变质反应中硅优先替代11B进入矿物晶格 ,因此在硅化交代中可以降低δ11B值 ,而脱硅反应中可以提高δ11B值 ;水化作用中 ,OH-带入11B ,使富水矿物具有较高的δ11B值 ;( 3)热水沉积及热液交代成因电气石均具有较低的δ11B值或者为负值 ;( 4)通过最近的研究表明 ,在热蒸馏过程中 ,硼同位素会发生明显的分馏 ,11B倾向于进入蒸汽相 ,而使残余相或后蒸馏相亏损11B ,形成较低的δ11B值。因此可以认为辽东地区元古界硼矿床属于热水沉积电气石岩在后期区域变质或热变质过程中分解出硼酸气水溶液交代镁碳酸盐形成硼镁石或硼镁铁矿矿物 ,而非蒸发沉积变质矿床。 相似文献
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宽甸群中的层控矿床 总被引：1，自引：0，他引：1
The stratabound mineral deposits in the Kuandian Group (PtK) are all transformed deposits and might be classified into two types: syngenetic transformed deposits, such as boron, iron, rare-earth, pyrite and apatite ores, and metamorphic hydrothermal transformed deposits, such as magnesite, asbestos and talc. The boron deposits in the Kuandian Group are confined to the middle part of the Kuandian geosyncline 45 km in width and 400 km in length, constituting a boron ore zone trending in the same direction as the geosyncline itself. They may be classified commerrcially into two types, i. e., "white boron ore" and "black boron ore". The former, made up mainly of boronmagnesite and suanite, are rarely associated with ferruginous minerals, while the latter contains ludwigite and magnetite, forming ore of mixed type, the former occurs unexceptionally in PtK: while the latter can be found in three stratigraphic positions, i. e., PtK22, PtK41 and PtK62. The B-Fe-TR formation has formed in time and space a metallogenic sequence and three obliquely arranged zones on account of the uneven distribution of useful element composition in the original strata. Within the Kuandian geosyncline, therefore, three subformations could be recognized from its periphery in inward succession: Fe-TR, B-Fe-TR and B-(Fe) subformations, accompanied by an increase in B and a decrease in Fe. So far as economic significance is concerned, the iron deposits in the Kuandian Group are likely to be assigned to four types, namely, Fe-TR type (Shengtieling type), Fe-B type (Wengquangou type), Fe-rich and sulfide-bearing type (Yanglin type) and Fe-magnesite-magnetite type (Daankou type). The "sedimentation- transformed" idea ought to be emphasized in the whole process of mineral exploration for stratabound deposits in Kuandian Group except for metamorphic-hydrothermal-transformed ones. Sedimentationis the base of being transformed, which has been verified by years of survey and prospecting. 相似文献