蒙阴县丁家庄地区铜矿（化）地质特征及成矿条件探讨

通过对蒙阴县丁家庄地区地层、构造、岩浆岩、地球化学特征、地球物理特征和矿体特征的论述,对该矿的成矿地质背景进行了探讨;认为丁家庄地区具有以金银铜铅锌为主的多金属综合异常,异常套合较好,矿化明显,是寻找铜及多金属矿的有利靶区,找矿前景较好。     

莱州马塘金矿地质特征与深部找矿远景

胶东地区是山东省金矿集中区,焦家成矿带为胶东地区7条金矿化带之一。赋存于该带的莱州市马塘金矿区-990 m标高以浅累计探明资源储量140 t。通过对其成矿地质背景、矿床地质特征及矿床成因、找矿标志、成矿规律的探讨,指出了马塘金矿深部-990 m标高以深的找矿远景,为进一步开展勘查工作提供了依据。     

山东省电气石矿地质特征及勘查方法探讨

论述了山东省电气石矿分布及赋存特征,矿体的产状、规模、厚度及其质量变化;研究了矿石类型、加工技术性能及开采技术条件;论述了目前该矿产勘查现状,结合矿床实例,对该类矿产的勘查方法进行了探讨。     

新疆富蕴县苏普特一带片麻岩地球化学特征及锆石U-Pb SHRIMP定年

苏普特片麻岩为含堇青石、矽线石及红柱石等变质矿物的眼球状、条纹条带状黑云斜长片麻岩、黑云二长片麻岩、二云母片麻岩等。其SiO2含量为63.12%~68.34%,Al2O3为13.64%~15.91%,TiO2为0.538%~0.772%,TFe2O3为6%左右,MgO含量较高,多数样品为3%左右。根据其岩石化学特征判断,原岩为泥质岩、砂岩等沉积岩。苏普特片麻岩稀土元素含量较高,ΣREE为155.21×10-6~271.93×10-6,轻稀土元素富集,具中等程度的负Eu异常;在以北美页岩(NASC)标准化的稀土配分型式图上具有较平缓的配分曲线,无明显的Ce、Eu异常。依据地球化学特征,推断其原岩的形成环境为活动大陆边缘。苏普特片麻岩中锆石具有岩浆锆石特征,其U-Pb SHRIMP年龄为282 Ma,可能代表了早二叠世的一次构造-岩浆-混合岩化事件。     

青海德尔尼铜钴矿外围综合物探方法应用研究

在分析德尔尼矿区试验剖面的基础上,论述了综合物探方法在调查外围隐伏矿体中的应用。激电扫面可快捷有效圈定异常范围,瞬变电磁法、可控源音频大地电磁法可快速判定异常体的位置、深度、倾向。多种方法相互佐证,结合地质资料排除干扰,可有效降低多解性,为下一步地质重点工程提供资料依据。实践表明,研究成果与钻孔资料、已知矿体基本吻合,在此基础上对德尔尼东、西两区提出了后期工作的重点目标靶区,表明在本区利用这些物探方法来寻找以低阻异常为特征的铜钴矿体是行之有效的。     

Evaluation of a Quality Control Monitor Material for the Routine Electron Probe Microanalysis of Kimberlite Exploration Garnets

Election probe microanalysis of indicator minerals is extensively used in the exploration for kimberlite deposits, the evaluation of specific kimberlite occurrences for their diamond bearing potential and to classify grains into different chemical and lithological mantle associations. Kimberlite exploration programmes can involve several tens of thousands of indicator mineral analyses. Procedures for monitoring data quality and consistency of analyses across large data sets are commonly absent. Suitable monitor minerals should be used to verify the data quality of kimberlite exploration and evaluation data sets. This material should have a suitable composition, be homogenous, be available in sufficient quantities and have a similar appearance to the unknown samples. Garnet P1, a megacryst garnet from the Premier kimberlite, was found to have a suitable composition as a monitor for kimberlite garnet analyses. Data were collected on the monitor material at regular intervals during routine analyses, over an extended period, both as a fixed grain mounted on the sample holder and as separate grains set within batches of routine samples. The data were evaluated to assess the quality and consistency in the analyses of large data sets over time. The monitor material was also analysed at independent laboratories using their routine analytical set-up and calibration procedures for comparative purposes. Values are given for the mean ± 2s range, which can serve as guide values for acceptable analyses for all elements.     

Analysis of High Density Regional Geochemical Soil Samples at the Council for Geoscience (South Africa): The Importance of Quality Control Measures

The Council for Geoscience (CGS, South Africa) has a statutory mandate to carry out regional geochemical mapping in South Africa that needs to be rapidly and accurately analysed. Both simultaneous X-ray fluorescence spectrometry (S-XRF) and a newly developed method using inductively coupled plasma-mass spectrometry (ICP-MS) were employed. Various trace elements that could not previously be analysed by S-XRF can now be analysed by ICP-MS for the regional geochemical mapping programme, e.g., Cd, Mo, Te and Li. Using both techniques, the CGS aims to report element distributions for some fifty elements. To ensure that element concentration levels correlate over map boundaries, quality control measures in the sampling, sample preparation and analyses were of critical importance. This paper aims to discuss the sample preparation and quality control measures as applied to the ∼5500 samples of the Giyani and Tzaneen 1:100000 scale map sheets sampled at a density of one soil sample per km². ICP-MS batch- and instrumental drift-correction procedures will be discussed. As a final step, geochemical data were overlain over simplified geological maps using geographical information system software. These maps complement existing geological information of South Africa, help in the identification of exploration targets, test exploration models and initiate further geological research.     

江西九江城门山铜多金属矿床土壤轻烃找矿试验

在开展城门山矿区新一轮的深部外围找矿过程中,传统的化探方法存在一定的局限性。本次工作在城门山矿区内蚀变矿化石英斑岩、矿区外围石英砂岩上方发育的土壤垂直剖面和1线、9线、J0线土壤测线中开展了系统的轻烃测量,尝试利用土壤轻烃异常示踪下伏的矿化信息。研究结果表明,除甲烷(C1)外,土壤轻烃(C2、C3、C4、C5)都能很好地示踪下伏的矿化信息,在花岗闪长斑岩(矿体)上方显示低值区,与土壤Hg气、磁化率高值形成镶嵌结构。通过对硫化物矿体上覆土壤的有机烃组分相关特征和变化规律的分析,可提出预测下伏矿体的评价指标,也有助于了解有机质在成矿作用过程中的赋存状态和演化规律。     

沁水盆地南部柿庄南区块煤层气地质特征

以国家科技重大专项《山西沁水盆地南部煤层气直井开发示范工程》成果为依据,以以往的地质勘查及研究成果为参考,对沁水盆地南部柿庄南区块煤层气地质特征进行分析。分析认为南部柿庄南区块构造简单,煤变质程度高、煤层厚度大、埋深适中而且分布稳定,有利于煤层气生成,煤层吸附能力较强,储层渗透率较好,煤层气保存条件好,是沁南煤层气勘探开发最有利区块之一。开发利用该区块煤层气资源,可有效改善地区能源结构、加快区域经济发展,降低后期煤炭开发风险,具有非常可观的社会及经济效益。     

武夷山成矿带铀成矿规律与找矿方向

武夷山成矿带铀成矿地质条件优越,前人数十年铀矿地质勘查找矿,在带内先后发现了数十个铀矿床和上百个铀矿(化)点带。文章在介绍地质背景和成矿特征基础上,总结了铀成矿规律,提出区内进一步找矿,一方面应对现有矿床、矿化点带开展深边部成矿条件和矿化信息调查,探索深部成矿潜力,加大勘查找矿深度,扩大资源量;另一方面,加强以印支期花岗岩为基底或围岩、深大断裂构造发育和有燕山晚期次火山活动叠加地段的勘查找矿,积极探索新类型,努力开辟新地区。