钦杭成矿带南段东岗岭组灰岩稀土元素的地球化学特征

对钦杭成矿带南段东岗岭组灰岩中白云质灰岩和炭质灰岩进行了稀土元素的测试分析,结果表明,ΣREE稀土总量(不包括Y元素)从9.15×10-6到133.88×10-6,平均值为45.62×10-6,LREE/HREE为8.09~16.40,轻稀土富集明显,Ce具有微弱的负异常,Eu有中等的负异常,结合野外观察,认为东岗岭组灰岩为正常海相沉积,成岩温度相对较低,其沉积环境为一个较封闭条件下的浅海海湾。     

油气微生物勘探技术的应用展望

油气微生物勘探(M POG)技术作为一种新的地表油气勘探方法,以其直接、有效、多解性小且经济等优势日益受到全球油气勘探界的重视,尤其是利用甲烷氧化菌和丁烷氧化菌对非常规油气藏的预测和确定地址构造的含油级别和油气分布,指明油气藏泄油位置均有重要意义。通过油气微生物勘探技术实践和技术分析结果,认为该技术对我国复杂地质条件下的油气勘探具有重要的应用价值。     

淮北袁店8煤岩浆热蚀变的微组构响应

选取袁店8煤层内碎裂煤、焦油煤、天然焦和火夹焦为研究对象,研究其显微图像和拉曼光谱特征,揭示不同变质程度煤微组构特征及其对岩浆蚀变的响应。结果显示,碎裂煤以均质镜质体为主,微裂隙网脉发育,ID=3 500~7 300,IG=5 000~12 000;焦油煤由碎裂镜质体和少量煤焦油组构,ID和IG均介于1 000~3 500;天然焦由碳质中间相及其内部所包裹的气泡和焦油液滴组成,ID=430~700,IG=380~650;火夹焦由焦化基质及较小气泡和少量矿物微球组成,ID=920~1 560,IG=640~910。分析显示,趋近岩体,碳质组分由干燥破裂、挤压破碎向中间相和熔融态转变;碳质组分拉曼光谱IG/ID值逐渐降低。这表明,趋近岩体,煤层遭受破坏和变质程度逐渐增强,煤分子片层持续解聚,层间缺陷不断增加,碳质组分的结构有序度逐渐降低。     

Mineralization-related geochemical anomalies derived from stream sediment geochemical data using multifractal analysis in Pangxidong area of Qinzhou-Hangzhou tectonic joint belt, Guangdong Province, China

Distinguishing geochemical anomalies from background is a basic task in exploratory geochemistry. The derivation of geochemical anomalies from stream sediment geochemical data and the decomposition of these anomalies into their component patterns were described. A set of stream sediment geochemical data was obtained for 1 880 km 2 of the Pangxidong area, which is in the southern part of the recently recognized Qinzhou-Hangzhou joint tectonic belt. This belt crosses southern China and tends to the northwest (NE) direction. The total number of collected samples was 7 236, and the concentrations of Ag, Au, Cu, As, Pb and Zn were measured for each sample. The spatial combination distribution law of geochemical elements and principal component analysis (PCA) were used to construct combination models for the identification of combinations of geochemical anomalies. Spectrum-area (S-A) fractal modeling was used to strengthen weak anomalies and separate them from the background. Composite anomaly modeling was combined with fractal filtering techniques to process and analyze the geochemical data. The raster maps of Au, Ag, Cu, As, Pb and Zn were obtained by the multifractal inverse distance weighted (MIDW) method. PCA was used to combine the Au, Ag, Cu, As, Pb, and Zn concentration values. The S-A fractal method was used to decompose the first component pattern achieved by the PCA. The results show that combination anomalies from a combination of variables coincide with the known mineralization of the study area. Although the combination anomalies cannot reflect local anomalies closely enough, high-anomaly areas indicate good sites for further exploration for unknown deposits. On this basis, anomaly and background separation from combination anomalies using fractal filtering techniques can provide guidance for later work.     

粤西坡仔营钼矿花岗质岩石成因对比

选取坡仔营钼矿区内所发育的花岗斑岩、石英斑岩、细粒花岗岩和花岗片麻岩,对比分析其稀土组成、石英的电子探针结果及拉曼光谱特征。结果显示,细粒花岗岩与花岗片麻岩稀土组成、石英晶体SiO₂含量及其结晶学特征均存在明显差异,二者应形成于不同的成因过程。花岗斑岩及其斑晶组成与细粒花岗岩相似,揭示二者很可能为同源产物;而石英斑岩组成与花岗片麻岩更接近,推测其为花岗斑岩上侵后者混染所致。     

云浮硫铁矿尾矿成分特征分析及其综合利用研究

为探究云浮硫铁矿尾矿的成分特征及其综合利用方案,采用XRD、ICP-MS对其进行测试分析。测试结果表明：云浮硫铁矿尾矿中O、Si、Fe、S、Ca等元素含量相对较高,主要成分为石英,含量高达50%左右,以及黄铁矿、石膏、长石、钙碱性矿物等。据此,设计其综合利用途径为：首先通过筛分、重选,获得轻、重尾矿;重尾矿中设计回收S、Fe两种有价元素;剩下的轻尾矿主要成分是SiO₂,以及含有少量的Al、Ca、Mg等元素,设计开发成微晶玻璃与蒸压加气混凝土两种建材,达到了废物高效、全面利用的目的。     

丰村铅锌矿赋矿地层微量元素地球化学特征

对丰村铅锌矿东岗岭组灰岩进行微量元素测试分析,结果表明：Mn含量为（208.3~3 191）×10^-6,平均为1 027.42×10^-6,大约是中国沉积岩石丰度的4倍,Sr含量为（28.69~488.9）×10^-6,平均为300.45×10^-6。w(Sr)/w(Ba)>1,可能是正常海相沉积,而且,w(Sr)/w(Cu)值一般都远大于10,说明该组灰岩沉积时处于封闭、干燥、缺氧的还原环境;Pb、Zn均明显高于地壳丰度,推测东岗岭组灰岩可能是其主要矿源层,少部分样品w(U)/w(Th)>1,暗示后期受热液改造,丰村铅锌矿具有沉积叠加热液改造型矿床的特点。