煤矿酸性矿井水主动式生物修复中铁的行为与归宿     

盛益之  王广才  刘莹  李广贺 《地学前缘》2018,25(4):299-306

酸性条件下Fe(II)的生物氧化过程可以被有效应用于煤矿酸性矿井水修复中,但是Fe行为与归宿的不确定性增加了应用难度。本研究通过对某煤矿酸性矿井水场地发生的生物地球化学过程进行监测,富集培养场地沉积物嗜酸微生物群落,进行室内恒化生物反应器连续流实验,探究微生物作用下Fe及其他金属离子的行为与归宿。研究表明,Fe的形态转化是场地和反应器中最主要的生物地球化学过程。当pH<2.7时,反应更倾向于产生溶解性Fe(III);当2.7相似文献   

The Relationship between Fe Mineralization and Magnetic Basement Faults using Multifractal Modeling in the Esfordi and Behabad Areas (BMD), Central Iran     

Masoumeh NABILOU  Peyman AFZAL  Mehran ARIAN  Ahmad ADIB  Hassan KHEYROLLAHI  Mohammad FOUDAZI  Parviz ANSARIRAD 《《地质学报》英文版》2022,96(2):591-606

Multifractal modeling is a mathematical method for the separation of a high potential mineralized background from a non-mineralized background. The Concentration-Distance to Fault structures (C-DF) fractal model and the distribution of the known iron (Fe) deposits/mines seen in the Esfordi and Behabad 1:100,000 sheets from the Bafq region of central Iran are used to distinguish Fe mineralization based on their distance to magnetic basement structures and surface faults, separately, using airborne geophysical data and field surveys. Application of the C-DF fractal model for the classification of Fe mineralizations in the Esfordi and Behabad areas reveals that the main ones show a correlation with their distance from magnetic basement structures. Accordingly, the distances of Fe mineralizations with grades of Fe higher than 55% )43% < Fe ≤ 60%) are located at a distance of less than 1 km, whereas for surfacial faults with grades of 43% ≤ Fe ≤ 60%, the distances are 3162< DF ≤ 4365 m from the faults. Thus, there is a positive relationship between Fe mineralization and magnetic basement structures. Also, the proximity evidence of Precambrian high-grade Fe mineralization related to magnetic basement structures indicates syn-rifting tectonic events. Finally, this C-DF fractal model can be used for exploration of magmatic and hydrothermal ore deposits.  相似文献   

鄂东鸡冠嘴矿区成矿岩体锆石SHRIMP U-Pb定年及其意义   总被引：5，自引：0，他引：5  

李华芹  陈富文  梅玉萍 《大地构造与成矿学》2009,33(3)

鄂东鸡冠嘴铜金(铁)矿床位于阳新岩体西北端,与铜绿山铜金矿床毗邻。矿区成矿岩体主要岩性为石英正长闪长玢岩、石英闪长岩、闪长岩和安山玢岩。其中石英正长闪长玢岩与成矿关系密切。在前人矿床地质特征研究基础上,笔者对成矿岩体进行了锆石SHRIMP U-Pb定年,获得石英正长闪长玢岩和闪长岩的年龄为146±2Ma(95%可信度,MSWD=1.3)和132±4Ma(95%可信度,MSWD=3)。测定结果表明,区内石英正长闪长玢岩和闪长岩分属燕山早期和燕山晚期岩浆活动的产物。鉴于矿体在空间上主要赋存于岩体内外接触带及层间破碎带中,推测成矿作用应略晚于石英正长闪长玢岩(146±2Ma)而早于闪长岩侵位的时间(132±4Ma),这与前人获得长江中下游铜铁金成矿带代表性矿床的辉钼矿Re-Os模式年龄分布在134.7～143Ma的研究结果一致。  相似文献   

黑龙江双鸭山地区白钨矿勘查开发的思考     

臧恩光  衣存昌  张春晓 《矿产与地质》2009,23(1)

双鸭山铁矿早已被开发利用,而钨矿却被忽略。文章通过对该成矿区典型矿床的地质特征,矿物学特征研究认为,铁矿、钨矿往往处于同一成矿区段,相伴产出,因此在该地区应加强钨矿的勘查力度。在矿床开发方面应统一布局,合理开发利用,达到资源利用最大化。  相似文献   

Transformation of Fe （Ⅱ） and Fe （Ⅲ） in Enclosures of Dongshan Bay     

《海洋科学》2012,36(2)

根据2008年8月与11月在东山湾海域获得的调查资料对表层水中溶解态Fe（II）和Fe（III）含量、浮游植物叶绿素a、营养元素及其浓度等环境参数进行分析。结果表明,夏、秋季海水中Fe（II）浓度及其在总溶解铁中所占比例均与浮游植物叶绿素a呈正相关,其相关系数分别为0.7959、0.9219。现场围隔实验表明,海水中总溶解态Fe含量在24 h内有较大的变化,最大减少量达到17.4%。DS2站点海水中Fe（II）浓度及其在总溶解铁中所占比例随光照强度增加而增加。最高值与初始值相比较,叶绿素a较高的DS2站点海水中Fe（II）浓度增加较叶绿素a较低的DS5号站点高0.053μg/L。Fe（II）和Fe（III）加富实验研究了溶解态的Fe（II）和Fe（III）在海水中相互转化。高浓度的Fe（II）在海水中被氧化成Fe（III）,海水中浮游植物也会引发光还原作用使Fe（III）还原成Fe（II）。  相似文献   

Magnetite geochemistry of the Longqiao and Tieshan Fe–(Cu) deposits in the Middle-Lower Yangtze River Belt: Implications for deposit type and ore genesis     

《Ore Geology Reviews》2017

Magnetite is a common mineral in many ore deposits and their host rocks, and contains a wide range of trace elements (e.g., Ti, V, Mg, Cr, Mn, Ca, Al, Ni, Ga, Sn) that can be used for deposit type fingerprinting. In this study, we present new magnetite geochemical data for the Longqiao Fe deposit (Luzong ore district) and Tieshan Fe–(Cu) deposit (Edong ore district), which are important magmatic-hydrothermal deposits in eastern China.Textural features, mineral assemblages and paragenesis of the Longqiao and Tieshan ore samples have suggested the presence of two main mineralization periods (sedimentary and hydrothermal) at Longqiao, among which the hydrothermal period comprises four stages (skarn, magnetite, sulfide and carbonate); whilst the Tieshan Fe–(Cu) deposit comprises four mineralization stages (skarn, magnetite, quartz-sulfide and carbonate).Magnetite from the Longqiao and Tieshan deposits has different geochemistry, and can be clearly discriminated by the Sn vs. Ga, Ni vs. Cr, Ga vs. Al, Ni vs. Al, V vs. Ti, and Al vs. Mg diagrams. Such difference may be applied to distinguish other typical skarn (Tieshan) and multi-origin hydrothermal (Longqiao) deposits in the MLYRB. The fluid–rock interactions, influence of the co-crystallizing minerals and other physicochemical parameters, such as temperature and fO₂, may have altogether controlled the magnetite trace element contents of both deposits. The Tieshan deposit may have had higher degree of fO₂, but lower fluid–rock interactions and ore-forming temperature than the Longqiao deposit. The TiO₂–Al₂O₃–(MgO + MnO) and (Ca + Al + Mn) vs. (Ti + V) magnetite discrimination diagrams show that the Longqiao Fe deposit has both sedimentary and hydrothermal features, whereas the Tieshan Fe–(Cu) deposit is skarn-type and was likely formed via hydrothermal metasomatism, consistent with the ore characteristics observed.  相似文献   

安徽庐枞盆地罗河铁矿床中榍石LA-ICP-MS U-Pb定年及其意义   总被引：1，自引：1，他引：0  

范裕  董赫  刘一男  张乐骏 《岩石学报》2017,33(11):3395-3410

罗河铁矿床位于长江中下游铁铜金成矿带庐枞矿集区,已探明资源量约10亿吨,是成矿带内最大的铁矿床。矿床主成矿阶段广泛发育热液成因榍石,以榍石-硬石膏-磷灰石组合为特征,在矿床-800~-900m和-1500~-1600m两个不同深度稳定发育,为确定成矿时代和成矿流体演化提供了良好的研究对象。本次工作对罗河铁矿床深部和浅部两层矿体中热液榍石开展了年代学及地球化学研究,结果表明榍石中存在(Al,Fe)~(3+)+(F,OH)~-=Ti~(4+)+O~(2-)置换反应,并富含Zr、Nb和REE等元素。榍石中Zr含量估算矿床成矿温度约700℃,指示玢岩型矿床比矽卡岩型铁矿床具有更高的成矿温度,高温条件有利于Ti元素的迁移。榍石的稀土元素配分图均呈现出明显右倾,并具较高的稀土元素总量以及明显的负Eu异常特征,轻稀土富集表明其结晶早于磷灰石和绿帘石等矿物,形成于高温热液环境,不同深度榍石的Eu异常变化表明成矿流体的氧逸度从深部到浅部有所升高。热液榍石原位微区LA-ICPMS U-Pb定年结果表明,上、下两层榍石形成时代分别为130.0±0.9Ma和129.1±0.8Ma~129.7±0.8Ma,表明罗河铁矿床两层矿体是同一成矿系统的在不同深度的产物。矿床成矿时代与区内隐伏闪长岩体成岩时代一致,结合矿床地质特征研究,本文认为闪长玢岩是矿床的成矿母岩。罗河铁矿床属于燕山晚期岩浆热液活动的产物,形成于区域早白垩世岩石圈减薄的环境。  相似文献   

南辽河群斜长角闪岩的地球化学特征及地质意义:以三家子地区为例   总被引：1，自引：0，他引：1  

李富强  董永胜  王鹏森  高铂森  甘宜成 《世界地质》2017,36(1):82-92

基于详细的野外地质调查,对南辽河群下部里尔峪组斜长角闪岩进行了岩相学和地球化学研究。岩相学研究表明,南辽河群下部里尔峪组斜长角闪岩属于正变质岩。地球化学研究显示,这些斜长角闪岩原岩属于高铁拉斑玄武岩系列(Nb/Y=0.16~0.4),SiO_2含量为47.27%~50.68%,具有较低的TiO_2含量(0.92%~1.61%),亏损高场强元素(Nb、Ta、Zr、Hf等),表明其原岩形成于岛弧或活动大陆边缘,而非前人所说的大陆裂谷。综合岩相学和地球化学特征,初步认为其岩石成因与活动大陆边缘有关。  相似文献   

含钙铝铁水解聚合产物的矿物学研究Ⅱ:热分解特性   总被引：2，自引：2，他引：0  

江虹  章兴华  孙传敏  陆洋  胡智  周丽芸 《矿物学报》2009,29(3)

分别以NaOH和Ca(OH)2作为碱化剂,合成了聚合氯化铝铁(PAFCNa,PAFCCa),比较样聚合氯化铝(PACNa,PACCa)、聚合氯化铁(PFCNa,PFCCa),制成低温干燥样进行热分解检测.热重分析证明,PAFCCa中的含水量高,主要是配位水与结晶水.当n(Al)/n(Fe)>5:5后,PAFCCa的含水量平均为42.3%.按Ca6Al2(SO4)3(OH)12·26H2O分子式计算,钙矾石的结构水(含OH水)含量为43.06%,两者含水量相当接近.TG-DTG热分析结果支持XRD对PAFCCa中存在含Ca3Al2(OH)12柱体的类钙矾石结构体的认定.PAFC-Ca根据其DTG曲线上的125℃和180℃两个脱水速率(肩)峰可以判别其中有无钙矾石结构体,以及相对量的多少.  相似文献   

Photoreduction of Fe(III) in the Acidic Mine Pit Lake of San Telmo (Iberian Pyrite Belt): Field and Experimental Work     

M. Diez Ercilla  E. López Pamo  J. Sánchez España 《Aquatic Geochemistry》2009,15(3):391-419

Light-induced reduction of dissolved and particulate Fe(III) has been observed to occur in the surface waters of the acidic mine pit lake of San Telmo (143,600 m², pH 2.8, Fe_total = 2.72 mM). This photochemical production of Fe(II) is directly related to the intensity of solar radiation and competes with biologically catalyzed reactions (i.e., bacterial re-oxidation of Fe(II)) and physical processes (including ionic diffusion, advection, and convection, which tend to homogenize the epilimnetic concentration of Fe(II) at every moment). Therefore, diel cycles of Fe(II) concentration are observed at the lake surface, with minimum values of 10–20 μM Fe(II) (0.35–0.70% Fe_total) at the sunrise and sunset, and maximum values of 90 μM Fe(II) (3.2% Fe_total) at midday in August 2005. Field and experimental work conducted in San Telmo and other pit lakes of the Iberian Pyrite Belt (IPB) (pH 2.3–3.1, Fe_total = 0.34–17 mM) indicate that the kinetics of the photoreductive reaction is zero-order and is independent of the Fe(III) concentration, but highly dependent on the intensity of solar radiation and temperature. Experimental work conducted with natural Fe(III) minerals (schwertmannite, goethite, and lepidocrocite) suggests that dissolved organic matter is an important factor contributing to the photochemical production of Fe(II). The wavelengths involved in the photoreduction of Fe(III) include not only the spectrum of UV-A radiation (315–400 nm), but also part of the photosynthetically active radiation (PAR, 400–700 nm). This finding is of prime importance for the understanding of the photoreduction processes in the pit lakes of the IPB, because the photo-reactive depth is not limited to the penetration depth of UV-A radiation (upper 1–10 cm of the water column depending on the TDS content), but it is approximately equal to the penetration depth of PAR (e.g., first 4–6 m of the water column in San Telmo on July 2007); thus, increasing the importance of photochemical processes in the hydro(bio)geochemistry of pit lakes.  相似文献