熔融制样波长色散X射线荧光光谱法测定白云石中钙镁硅铁铝

白云石属碳酸盐矿物,应用熔融制样X射线荧光光谱法测定其中主次量组分钙、镁、硅、铁、铝时,由于白云石灼烧减量大,在试料片制备过程中,如果以干基试料制备试料片,除灼烧减量外还有少量其他组分被分解出的大量CO₂带走,导致试料损失,测定结果偏低;如果以灼烧基试料制备试料片,由于灼烧后的试料极易吸收空气中的水分和CO₂,同样使测定结果偏低。基于质量守恒原理,本文直接以灼烧减量测量后的灼烧基试料质量作为试料量(即灼烧减量测定所称量的干基试料量扣除灼烧减量的量),以四硼酸锂为熔剂,5%碘化铵溶液为脱模剂,试料与熔剂的稀释比为1:10,于1050℃熔融15 min以上制备的试料片透彻、玻璃化程度高。以白云石标准物质和标准样品作为标准试料,制作各组分的标准曲线的相关系数在0.9940~0.9994之间;方法检出限为0.011%~0.48%;标准物质和标准样品的测定值与认定值基本一致,各组分的相对标准偏差(RSD,n=11)在0.5%~1.7%之间,方法具有较好的重现性。本方法以1050℃灼烧后的试样作为试料制备XRF分析样片,最大限度地降低了灼烧减量因素(空气中的水分和CO₂)对测定结果的影响,适用于白云石及其煅烧物中钙、镁、硅、铁、铝等组分的同时测定。     

甘肃北山红石山蛇绿岩锆石U-Pb年代学研究及构造意义

红石山蛇绿岩位于中蒙边境附近,出露于红石山-百合山-蓬勃山蛇绿混杂岩带最西段。岩石地球化学分析表明,红石山蛇绿岩中的玄武岩主量、微量及稀土元素皆显示类似MORB型玄武岩的地球化学特征,表现为低Na₂O+K₂O（2.99%）和P₂O₅（0.08%）,中等含量TiO₂（1.46%）;LREE球粒陨石标准化分配型式具平坦型和轻稀土略微富集的特征。微量元素原始地幔标准化分配型式显示出富集大离子亲石元素（Rb、K）的特征,HFSE变化相对较为稳定。红石山蛇绿岩中的辉长岩的LA-ICP-MS锆石U-Pb同位素定年结果显示,其形成时代为346.6±2.8Ma,代表该蛇绿岩形成时代,即为早石炭世。结合前人研究成果,笔者认为红石山蛇绿岩可能为石炭纪大陆裂谷向大洋转化的构造环境下形成的初始小洋盆,其向西可与新疆境内的巴音沟蛇绿岩对比,二者同属“红海型”洋盆初始洋壳的地质记录。     

烃气测量法在辽宁白云金矿找矿潜力评价中的应用

通过对辽宁白云金矿区典型的Ⅰ-1号金矿体11线的地表及井下不同标高进行系统采样,分析各指标异常在空间上与金矿体之间的对应关系,弄清白云地区地表土壤次生晕与坑道原生晕的关联性,发现烃气测量法在辽宁景观条件下完全适用,总结出了本区进行找矿预测的地质和地球化学找矿标志。通过对姚家岭北部地区进行烃类组分及部分微量元素异常展布特征分析,并结合异常分布区的地质条件进行了综合找矿潜力评价,圈定了相关找矿有利区。     

福建省紫金山铜金矿床原生晕地球化学特征及深部找矿前景

通过系统采集紫金山铜金矿床4~11线共41个钻孔的岩矿样,绘制原生晕剖面图,建立垂向元素分带序列、矿体剥蚀程度准则,结合深部指示元素的特征,进行隐伏矿预测。该矿床金矿近矿晕为Au-Ag-Zn1,尾部晕为BiGa-Mo-Sn-Ti-Co-Ni-W1-V;铜矿前缘晕为Hg-Sb-As,近矿晕为Cu-Pb1-Zn2,尾部晕为Be-W2。矿体剥蚀程度评价表明,高硫型铜矿体往深部已尖灭。深部F-Mn-Pb2-Zn3的异常形态和元素组合符合典型斑岩矿床的外带特征,斑岩体延伸至矿床周边;深部的蚀变矿物组合、金属矿物组合、流体包裹体特征等均表明深部可能存在斑岩铜(钼)矿床。     

Content Variations of Rubidium and Bromide in Sylvite Derived from Carnallite by Leaching of Magnesium Chloride

正The relationship between sylvinite and carnallite is important in the potash mine body contained carnallite,especially sylvinite overlies carnallite,the reverse of a normal depositional sequence.Trace elements are more     

海底三维建模关键技术

分析了当前海底三维建模流程中的关键技术,为建模人员提供指导。海底三维建模方法分为基于图像内容建模和基于点状地形数据建模。前者模型精确,视觉效果较好,但建模速度较慢,适合于小范围建模;后者建模速度较快,且满足海底大范围三维建模的精度要求。在海底三维建模中,对于小物件,采用基于图像的建模方法,而大范围的海底地形,采用基于点状数据的建模方法。     

Characterization of spatial and temporal variation of suspended sediments in the Yellow and East China Seas using satellite ocean color data

Total suspended sediment (TSS) data concentrations are retrieved from two sets of satellite ocean color data (the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard Aqua and the Korean Geostationary Ocean Color Imager (GOCI)) using an existing regional model to characterize spatial and temporal variation of TSS in the Yellow and East China Seas. MODIS-derived TSS maps show that TSS concentrations are, in general, high along the Korean and Chinese coasts including the Bohai Sea and the Yangtz River estuary, and lower in the middle of the Yellow Sea and the southeastern area of the East China Sea. The monthly average of 10-year MODIS data reveals that TSS values are highest during winter (January to February) and lowest in summer (July to August). Short-term TSS concentrations retrieved from GOCI data showed the dominant influence of semi-diurnal tidal changes on sediment dynamics through temporal (hourly) and spatial distribution in coastal zones of the Yellow sea. The results presented here demonstrate that the satellite-derived TSS products can be utilized as an application tool for future studies on long- and short-term sediment dynamics of turbid coastal waters. In particular, GOCI observations provide unique important capabilities to characterize and quantify the water properties at high temporal (hourly) and spatial (0.5 km) resolutions in the turbid coastal waters of the Yellow Sea and its vicinities.     

Empirical formula for wave length of ocean wave in finite depth water

In this paper, function characteristics of dispersion of ocean wave in finite depth water were analyzed systematically. The functional form of the fitting function is reasonably proposed, in which the parameters are optimally determined by the least square method （LSM）. For infinitely deep and extremely shallow water,the fitting function fits strictly the dispersion to be fitted. A new technique is presented in application of LSM.An empirical formula with maximum error of less than 0.5% for computing wavelength in finite depth water is presented for practical applications.     

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Examination of Daytime Length''''s Influence on Phytoplankton Growth in Jiaozhou Bay, China

1　INTRODUCTIONSystematicstudyisusefulforhumanvisualizationandcomprehensionofanetworkofcomplicatedcompo nentsandprocessesinvolvingfrequentenergyflow ,consideringenergyasthebasisofbothstructureandprocess (Automa ,1 993) .Energylanguageisaconceptfordepictingasysteminwhichallphenomenaareac companiedbyenergytransformation .Thefunctionoftheecosystemovertheworlddependsontheenergyfixationbymarineplantphotosynthesis ,mostofthemarefixedbymicrophytoplanktonnearseasurfaceexposedtosunlight (Niebaken …