腾冲县叫鸡冠梁子铁多金属矿地质特征及找矿方向     

王胜江 《云南地质》2014,(4):566-572

腾冲县叫鸡冠梁子铁多金属矿矿体呈似层状、脉状,赋存于二叠系空树河组中,空树河组普遍有矽卡岩化、角岩化和铁多金属矿化,矿化主要受矽卡岩控制,初步认为矿床类型为燕山晚期矽卡岩型铁多金属矿床.  相似文献   

Two pulses of mineralization and genesis of the Zhaxikang Sb–Pb–Zn–Ag deposit in southern Tibet: Constraints from Fe–Zn isotopes     

《Ore Geology Reviews》2017

Zhaxikang is one large Sb–Pb–Zn–Ag deposit located in the North Himalaya of southern Tibet. To date, the genesis of this deposit still remains controversial. Here, we present new pyrite Fe and sphalerite Zn isotopic data for the first three stages of mineralization, Fe–Zn isotopic data for Mn–Fe carbonate that formed during the first two stages of mineralization, and Zn isotopic data for the slate wall rocks of the Jurassic Ridang Formation to discuss the genesis of the Zhaxikang deposit. The overall δ⁵⁶Fe and δ⁶⁶Zn values range from −0.80‰ to 0.43‰ and from −0.03‰ to 0.38‰, respectively. The δ⁵⁶Fe values of Mn–Fe carbonates are lighter than those of associated pyrite in six mineral pairs, indicating that the iron carbonates are preferentially enriched in light Fe isotopes relative to pyrite. The sphalerite has lighter δ⁶⁶Zn values than associated Mn–Fe carbonates in three mineral pairs.The δ⁵⁶Fe values of pyrite that formed during the first three stages of mineralization gradually increase from stage 1 (−0.33‰ to −0.09‰) through stage 2 (−0.30‰ to 0.19‰) to stage 3 (0.16‰–0.43‰). In comparison, the sphalerite that formed during these stages has δ⁶⁶Zn values that gradually decrease from stage 1 (0.16‰–0.35‰) through stage 2 (0.09‰–0.23‰) to stage 3 (−0.03‰ to 0.22‰). These data, in conjunction with the observations of hand specimens and thin sections, suggest that the deposit was overprinted by a second pulse of mineralization. This overprint would account for these Fe–Zn isotopic variations as well as the kinetic Rayleigh fractionation that occurred during mineralization. The temporally increasing δ⁵⁶Fe and decreasing δ⁶⁶Zn values recorded in the deposit are also coincident with an increase in alteration, again supporting the existence of two pulses of mineralization. The δ⁵⁶Fe values of the first pulse of ore-forming fluid were calculated using theoretical equations, yielding values of −0.54‰ to −0.34‰ that overlap with those of submarine hydrothermal solutions (−1‰ to 0‰). However, the δ⁵⁶Fe values of the stage 3 pyrite are heavier than those of typical submarine hydrothermal solutions, which suggests that the second pulse of mineralization was probably derived from a magmatic hydrothermal fluid. In addition, the second pulse of ore-forming fluid has brought some Fe and taken away parts of Zn, which results the lighter δ⁶⁶Zn values of sphalerite and heavier δ⁵⁶Fe values of pyrite from the second pulse of mineralization. Overall, the Zhaxikang deposit records two pulses of mineralization, and the overprint by the second pulse of mineralization causes the lighter δ⁶⁶Zn values and heavier δ⁵⁶Fe values of modified samples.  相似文献   

Effects of waterborne Fe(II) on juvenile turbot Scophthalmus maximus: analysis of respiratory rate, hematology and gill histology     

��־�  �ȷ�  �����  ������  ���  ����� 《中国海洋湖沼学报》2012,30(2):193-199

The concentration of Fe(Ⅱ) is high in some groundwater supplies used in turbot culture,and the toxicity of waterborne Fe(Ⅱ) is unknown.We investigated the stress responses of juvenile turbot,Scophthalmus maximus,exposed to Fe(Ⅱ) of different concentrations (0.01,0.05,0.1,0.5,1,and 2 mg/L) for 1,7,14,and 28 d,under the same ambient conditions of other parameters.Changes in respiratory rate,hematological parameters,and gill structure were determined.The results show that waterborne Fe(Ⅱ) did not cause severe hematological perturbation to turbot.A low-medium Fe(Ⅱ) concentration (lower than 0.1 mg/L) could boost the respiratory rate,and caused no or very limited damage to fish.A high Fe(Ⅱ) concentration (0.1 mg/L or higher),however,caused gill damage,such as vacuoles in branchial lamellae,epithelial necrosis,and hypertrophy of epithelial cells,and even death after extended exposure time.Therefore,excess waterborne Fe(Ⅱ) and long-term exposure to Fe(Ⅱ) could be responsible for poor growth and high mortality of turbot in culture.The concentration of waterborne Fe(Ⅱ) in turbot culture should be kept below 0.1 mg/L.  相似文献   

Modeling of the Removal of Arsenic Species from Simulated Groundwater Containing As,Fe, and Mn: A Neural Network Based Approach     

Prasenjit Mondal  Bikash Mohanty  Chandrajit Balomajumder  Samir Saraswati 《洁净——土壤、空气、水》2012,40(3):285-289

The present paper deals with the modeling of the removal of total arsenic As(T), trivalent arsenic As(III), and pentavalent arsenic As(V) from synthetic solutions containing total arsenic (0.167–2.0 mg/L), Fe (0.9–2.7 mg/L), and Mn (0.2–0.6 mg/L) in a batch reactor using Fe impregnated granular activated charcoal (GAC‐Fe). Mass ratio of As(III) and As(V) in the solution was 1:1. Multi‐layer neural network (MLNN) has been used and full factorial design technique has been applied for the selection of input data set. The developed models are able to predict the adsorption of arsenic species with an error limit of ?0.3 to +1.7%. Combination of MLNN with design of experiment has been able to generalize the MLNN with less number of experimental points.  相似文献   

兼养小球藻在不同浓度Fe³⁺培养下的蛋白质组学研究     

刘彩霞  顾文辉  黄爱优  伍松翠  张宝玉  王广策 《海洋科学》2017,41(3):1-7

为研究小球藻(Chlorella vulgaris)对不同浓度Fe~(3+)的响应,测定了自养和乙酸兼养小球藻在不同浓度Fe~(3+)条件下的生长速率和油脂含量,比较分析了兼养小球藻在不同浓度Fe~(3+)下的蛋白质组表达差异。结果表明,兼养小球藻比自养小球藻生长速率快,积累的生物量多,在缺铁条件下中性脂含量高。蛋白质组分析显示:在缺铁条件下光合作用相关蛋白含量最低;在缺铁和高浓度铁条件下,热激蛋白、蛋白合成和糖代谢等过程相关蛋白表达都下调,表明缺铁和高浓度铁条件对小球藻的生长都是逆境条件;在缺铁条件下氨基酸代谢相关蛋白表达上调,这可能是由于NO_3~–同化下降,氨基酸合成减少,需要进行氮的回收利用。上述结果表明:在兼养条件下缺铁培养的小球藻可获得较高生物量和中性脂含量;而高浓度铁能促进小球藻生长,但不能提高中性脂含量,对藻细胞也有一定的胁迫效应。  相似文献   

4‐Phenyl‐3‐thiosemicarbazide Modified Magnetic Nanoparticles: Synthesis,Characterization and Application for Heavy Metal Removal          下载免费PDF全文

Kiomars Zargoosh  Mohammad Reza Mohammadi  Hamed Abedini 《洁净——土壤、空气、水》2014,42(9):1208-1215

  相似文献   

湛江市深层承压水铁分布和地球化学模拟研究     

姚锦梅  周训  谢朝海 《现代地质》2009,23(6):1174-1179

在广东省湛江市深层承压水开采过程中,在开采区内形成了区域水位降落漏斗。降落漏斗的形成对深层承压水的化学特性产生了一些影响,具体表现为：西部和西北部铁含量低,北部铁含量高,降落漏斗附近铁含量中等。对降落漏斗内深层承压水铁分布进行演化模拟计算,结果表明,降落漏斗内深层承压水的补给可能来自北部高铁承压水、西部和西北部低铁承压水以及浅层承压水。深层承压水由这些地下水混合而成,高铁地下水是主要补给来源。降落漏斗中心区深层承压水的大量人工开采导致其铁含量升高。地下水在向降落漏斗中心区的径流过程中,不但发生了方解石、白云石和赤铁矿的溶解作用以及菱铁矿和水绿矾的沉淀作用,而且发生了Na⁺与Ca²⁺的交换、铁氧化-还原反应等一系列复杂的水-岩作用。  相似文献   

负载型纳米Pd/Fe对挥发性氯代烃的去除     

尚海涛  李智灵  杨琦  席宏波  郝春博 《现代地质》2008,22(2):313-320

氯代烃的污染治理已成为当今世界最热门的研究领域之一。以水体中最常见的氯代烃污染物1,1-二氯乙烯（1,1-DCE）、林丹（γ-HCH）为主要目标污染物,探讨了不同条件下负载型纳米Pd/Fe对氯代烃的去除效果。负载型纳米Pd/Fe采用浸渍→液相还原→还原沉淀的方法制备,透射电镜显示采用该方法制备的负载型金属钯和铁的平均粒径均在纳米级范围内。负载型纳米Pd/Fe具有较高的表面反应活性,当负载型纳米Pd/Fe 用量为40 g/L、反应时间达2 h时,1.1-二氯乙烯和林丹的去除率分别达到85%和100%。脱氯率与Pd/Fe投加量、钯含量、初始pH值、反应温度等因素有关,与溶液的初始浓度关系不大。负载型纳米Pd/Fe对11-DCE和γ-HCH去除均符合一级反应动力学方程,速率常数分别为0-528 3 h^-1及2-012 9 h^-1,反应的半衰期t1/2分别为1.31 h和0.34 h。推断在反应过程中,Fe腐蚀产生的H2为主要还原剂,Pd是良好的加氢催化剂,在金属颗粒表面形成高浓度反应相,使反应短时间内完成。  相似文献   

太湖表层沉积物磷的吸附容量及其释放风险评估   总被引：34，自引：2，他引：34  

黄清辉  王子健  王东红  王春霞  马梅 《湖泊科学》2004,16(2):98-105

利用沉积物磷吸附指数(PSI)和磷吸附饱和度(DIS)等指标来表征太湖表层沉积物的磷吸附容量，并探讨了太湖沉积物磷吸附容量的空间变化．研究发现：草酸铵提取的磷以及活性铁、铝氧化物含量在梅梁湾东北部至五里湖一带的沉积物中较高，而在太湖南部湖区相对较低，这主要是与附近城市污水的实际贡献有着密切关系；太湖沉积物的磷吸附指数大体上有着北高南低、西高东低的分布特征，而磷吸附饱和度分布与PSI恰有相反的特征；沉积物中磷的吸附容量可能主要受到无定形的铁和铝的氧化物控制，也受沉积物有机质含量的影响．初步确定了用磷吸附指数和磷吸附饱和度来表征的湖泊沉积物磷释放风险指数概念，并应用于对太湖沉积物磷诱发的富营养化风险的评估．  相似文献   

亚洲沙尘对三种海洋微藻生长的影响   总被引：2，自引：0，他引：2  

孙佩敬  李瑞香  徐宗军  朱明远  石金辉 《海洋科学进展》2009,27(1)

实验研究了采自亚洲沙尘暴源地的4种沙尘及1种采自青岛的沙尘对不同海洋微藻生长的影响,结果表明在营养盐贫乏的条件下,沙尘的添加对旋链角毛藻(Chaetoceros curvisetus),小角毛藻(Chaetoceros minutissimus)和东海原甲藻(Prorocendrum donghaiense)的生长具有明显的促进作用.与不加沙尘的对照组相比,指数生长期的比生长速率明显升高;其中取自青岛的沙尘对3种藻类的影响最明显;内蒙古锡林郭勒盟正蓝旗的沙尘营养盐含量最低,但是由于其可溶性Fe的溶出量最高,其促进作用也比较显著.在营养盐充足的条件下,沙尘的添加对3种微藻生长的影响均不显著.因此亚洲沙尘输送到西北太平洋海域可能对该海域的初级生产力具有显著的影响.  相似文献