湖北樟村坪磷矿矿床三维地质建模及资源量估算   总被引：1，自引：0，他引：1       下载免费PDF全文

刘智宇  肖克炎 《江苏地质》2013,37(4):616-620

对湖北宜昌磷矿黑良山矿区进行矿床三维模型建立及储量估算。黑良山普查区是全国主要成磷区之一,经过几十年的开采建设,矿山已成为危机矿山。在对该地区成矿背景研究及资源勘探的前提下,收集了钻孔、剖面等数据,利用“探矿者”软件以及三维可视化和三维建模技术,建立了樟村坪磷矿的三维矿床模型并对矿体进行储量估算。  相似文献   

Comparison of the defluoridation efficiency of calcium phosphate and chitin in the exoskeleton of Antarctic krill     

WANG Zhangmin  YIN Xuebin 《极地研究(英文版)》2012,(3):149-154

Calcium （Ca）, phosphorus （P）, and chitin are the main components of the exoskeleton of krill. Defluoridation of a solution of sodium fluoride （NaF） using calcium phosphate （Ca3（PO4）2） and chitin as defluoridation agents was studied. Orthogonal experiments were designed to find the optimum reaction conditions for defluoridation, to obtain the maximum defluoridation efficiency and fluoride removal capacity of calcium phosphate and chitin. At the same time, a comparison of the capacity of the two defluoridation agents was made. The results suggest that calcium phosphate has a far greater capability than chitin for the removal of fluoride （F） from water under similar reaction conditions. It is also suggested that Antarctic krill is likely to adsorb fluoride via compounds such as calcium phosphate, hydroxyapatite, and other compounds of Ca and P with the general form （Ca, X）x（PO4, HPO4, Y）y（OH, Z）z, in addition to chitin.  相似文献   

Isolation and characterization of phosphate-solubilizing bacteria from seagrass rhizosphere soil   总被引：1，自引：0，他引：1  

Upasana Ghosh  Ponnambalam Subhashini  Elangovan Dilipan  Subramanian Raja  Thirunavukarassu Thangaradjou  Lakshmanan Kannan 《中国海洋大学学报(英文版)》2012,11(1):86-92

Phosphate-solubilizing bacterial strains(6 Nos.) were isolated from the rhizosphere soils of two seagrasses(Halophila ovalis(R.Br.) Hook and Halodule pinifolia(Miki) Hartog) in the Vellar estuary.Experimental studies found that the strain PSSG6 was effective in phosphate solubilization with Phosphate Solubilization efficiency index E = 375 ± 8.54,followed by the strain PSSG5 with Phosphate Solubilization efficiency index E = 275 ± 27.3.Of the 6 strains isolated,the strains PSSG4 and PSSG5 be-longed to the genus Bacillus,and PSSG1,PSSG2 and PSSG3 were identified as Citrobacter sp.,Shigella sp.,and Klebsiella sp.,respectively,by conventional method,and PSSG6 was identified as Bacillus circulans using conventional and molecular methods.  相似文献   

Low flow water chemistry in forested and pasture catchments,Mawheraiti River,Westland     

M. P. Mosley  L. K. Rowe 《新西兰海洋与淡水研究杂志》2013,47(3):307-320

Water samples taken at 19 locations in the Mawheraiti River catchment at weekly intervals during 1979–80 were analysed for sodium, magnesium, potassium, calcium, phosphate, nitrate, and ammonium ion concentrations and for electrical conductivity. Seasonal discharge effects were apparent, and lithology and land management practice also influenced solute concentrations. Solute concentrations were generally very low; nitrate and soluble phosphate were rarely greater than 0.05 mg.L^‐1 and ammonium was rarely greater than 0.01 mg.L^‐1. The 4 major cations (Na, Mg, K, and Ca) usually summed to less than 6 mg.L^‐1 much of which was supplied by precipitation. Forest management (clearfelling and slash‐burning) caused significant increases in solute concentrations, but concentrations declined rapidly during succeeding months and approached pretreatment levels after 2–3 years. The higher concentrations associated with forest management in small experimental catchments were rapidly diluted downstream; together with the low natural solute concentrations this suggests that harmful downstream effects of management practices are unlikely under low flow conditions.  相似文献   

Enhancing Geophysical Signals Through the Use of Savitzky-Golay filtering method     

《Geofísica Internacional》2014,53(4):399-409

In the Sidi Chennane basin exploitation inclusions of sterile hardpan—so-called “derangements” — are hard to detect and interfere with phosphate extraction. A Schlumberger resistivity survey over an area of 50 hectares was carried out. The Savitzky-Golay filtering method was used as a tool for denoising the data.Savitzky-Golay (S-G) filters are one of the filters which can smoothen out the signal without much destroying its original properties. Despite their exceptional features, they were rarely used so far in the geophysical signal processing. The aim of this paper is the investigation of their properties in detail from the geoelectrical signal processing aspect. The experimental results indicate that S-G filter is better for denoising geoelectrical signal. Models of the geology were successfully obtained from Savitzky-Golay filtering method, which help mapping the phosphate deposit inclusions and the estimations of phosphate reserves were improved and better constrained.  相似文献   

Mineralogical and geochemical alteration of low-grade metamorphic black slates due to oxidative weathering   总被引：1，自引：0，他引：1  

Cornelius Fischer  Christian Schmidt  Reinhard Gaupp 《Chemie der Erde / Geochemistry》2009,69(2):127-183

Low-grade metamorphic black slates of Silurian and Lower Devonian ages (from the Thüringisches Schiefergebirge in Germany) were investigated to identify mineralogical and geochemical alterations that occur during the oxidative weathering black slates.The slates exhibit an intense total organic carbon decrease (>90 wt%) due to oxidative weathering. The organic matter in black slate consists mainly of non-pyrolysable material with only minor portions of pyrolysable material. In contrast to the non-pyrolysable organic matter, the concentration of pyrolysable organic matter is not decreased during weathering. Heating experiments have yielded information about a potential protection of pyrolysable organic matter against weathering, which is probably caused by a structural configuration or the intergrowth of organic matter and illite.The slates consist mainly of illite. Iron oxide (goethite) and phosphate encrustations were formed on slate surfaces as a result of oxidative and acid weathering of both iron sulfide and monazite. Kaolinite often occurs as an older encrustation beneath the iron oxide encrustations. Encrustations of iron oxide and phosphate are major sinks for trace elements, released during oxidative weathering.  相似文献   

富稀土磷酸盐及其在深海成矿作用中的贡献   总被引：1，自引：0，他引：1  

任江波  何高文  朱克超  邓希光  刘纪勇  傅飘儿  姚会强  杨胜雄  孙卫东 《地质学报》2017,91(6):1312-1325

中国最近几年对中北太平洋海域开展了系统调查,在中太平洋海盆新发现了稀土含量高达2000×10~(-6)的富稀土泥。深海泥样品稀土与各主要氧化物相关图解中,∑REY与P_2O_5含量始终保持良好的相关性。在太平洋各沉积物柱状样中,∑REY随着P2O5变化非常敏感。如果将P_2O_5含量高于0.25%的样品剔除,深海泥的∑REY不高于400×10~(-6),指示了磷对稀土元素的控制。海洋磷酸盐能够继承海水的负Ce异常及高Y/Ho比值特征,深海泥样品具有相似特征,且表现为稀土含量越高,其稀土配分模式越接近磷酸盐。酸淋滤实验显示,滤液中萃取出大部分的P及∑REY,且∑REY与P含量具有良好的正相关关系。无论∑REY高低,滤液稀土配分均呈现出显著的负Ce异常;而难溶残留物的∑REY普遍较低,且无负Ce异常特征。根据12组滤液中PO_4~(3-)与∑REY,估算出深海泥中的磷酸盐具有的∑REY含量范围为9495×10~(-6)~28287×10~(-6),这与深海泥中生物磷灰石的稀土含量和稀土模式均吻合。综上所述,我们认为深海泥中的磷酸盐主要以富稀土磷酸盐的形式存在,其稀土含量远高于深海泥中的铁锰氧化物和铝硅酸,因此磷含量的变化对于深海泥的稀土含量和模式影响至关重要。相较于碳酸盐沉积环境下容易形成贫稀土的磷块岩,深海环境下的化学沉积以及有机P的成岩作用容易形成富稀土磷酸盐。  相似文献   

Iolite软件处理LA-ICP-MS线扫描数据适用性研究   总被引：4，自引：4，他引：0  

朱碧  朱志勇  吕苗  杨涛 《岩矿测试》2017,36(1):14-21

LA-ICP-MS分析技术是获取矿物/岩石内部的元素和同位素成分变化的重要手段。在利用该技术对地质样品进行线/面扫描时,仪器输出的初始数据量远远大于点分析,数据的处理和计算是一个关键问题。本文以磷质结核样品为例,阐述了利用Iolite软件进行元素线扫描数据计算的主要过程,包括背景信号的扣除、标准物质信号的拟合、线分析数据的导出等。借助软件自带的分段导出功能,对不同时间和空间分辨率下采集数据得到的结果进行了比较。研究表明Iolite能有效处理线分析数据,分析结果与前人用传统化学全岩法测定得到的元素含量范围相当。对比不同空间分辨率下(10μm、50μm、100μm)获取的数据发现:相对于选用的束斑直径(40μm),在分辨率过小(10μm)或过大(100μm)的条件下获得的数据存在数据波动大以及细节不足等缺陷;而当分辨率(50μm)与选用的束斑直径接近时,数据质量得到最大优化。本研究展示了Iolite软件在处理线扫描数据方面具有很好的应用前景,通过分辨率的选取可实现数据的优化。  相似文献   

沙漠颗粒物对磷酸盐的吸附动力学研究     

李北罡  白晓玲  马钦 《中国沙漠》2011,31(6):1388-1392

研究了乌兰布和沙漠和库布齐沙漠颗粒物在黄河水体中对磷酸盐(P)的吸附动力学及其影响因素和吸附/解吸平衡质量浓度(EPC0值)。结果表明：①不同沙漠颗粒物对P的吸附能力各不相同,但吸附速率均在前 8 h内较快,以后逐渐趋缓,在48 h时基本达到吸附平衡。磷初始浓度和颗粒物浓度均对颗粒物吸附P有一定影响;②颗粒物对P的吸附过程均符合准二级吸附动力学模型及Weber-Morris扩散方程,吸附过程主要由P在颗粒物内的扩散过程控制;③入河沙漠颗粒物在黄河水体中对P的吸附过程存在一个吸附/解吸平衡点,该点对应的不同颗粒物对P的EPC0值为0.010~0.042 mg·L-1,且其值均大于相应黄河水体中的P浓度,说明沙漠颗粒物入河后有向水体释磷的趋势。  相似文献   

L-抗坏血酸-2-磷酸酯镁的合成   总被引：7，自引：0，他引：7  

黄金钊  马延军  孙明昆  钱佐国 《中国海洋大学学报(自然科学版)》1999,(Z1)

以Ｌ抗坏血酸为基本原料合成Ｌ抗坏血酸２磷酸酯镁。对两种合成方法直接酰化法和基团保护法作实验比较和改进。直接酰化法中,采用混合碱（ 包括氧化镁） 可使磷酰化与成盐反应合并为一步进行,并能提高产率,而采用基团保护法能取得最佳的合成效果。  相似文献