西昆仑乔尔天山——岔路口地区铅锌矿成矿特征及找矿标志

西昆仑乔尔天山-岔路口铅锌矿区位于甜水海地块与神仙湾二叠—三叠纪裂陷盆地结合部位。该地区集中了全新疆最大的Pb异常、第二大的Zn异常以及第二大的Hg异常。目前,区内已发现了24处铅锌矿床(点),其中2处矿床规模达中型,1处达大型。笔者在野外实地调研和充分利用前人地质矿产及化探成果资料的基础上,全面分析了区内铅锌矿的地质矿产特征,初步研究了矿床成因类型,系统总结了典型找矿标志。对本区今后找矿工作具有一定的参考价值。     

Early Paleozoic tectonic evolution of the Xing-Meng Orogenic Belt: Constraints from detrital zircon geochronology of western Erguna–Xing’an Block,North China

To better constrain the Early Paleozoic tectonic evolution of the western part of the Erguna–Xing’an Block, detrital zircon U–Pb dating was applied on the Ordovician to Devonian sedimentary strata along the southeast part of the China–Mongolia border. Most of the zircons from five sedimentary samples display fine-scale oscillatory growth zoning and Th/U ratios higher than 0.1, indicating a magmatic origin. All five Ordovician–Devonian samples display the similar age distribution patterns with age groups at ∼440 Ma, ∼510 Ma, ∼800 Ma, ∼950 Ma, and few Meso- to Paleo-Proterozoic and Neoarchean grains. This age distribution pattern is similar to those from adjacent blocks in the southeastern Central Asian Orogenic Belt. Considering previous tectonic studies, we propose bidirectional provenances from the Erguna–Xing’an Block and Baolidao Arc.Consequently, a new model was proposed to highlight the Early Paleozoic tectonic evolution of the western Erguna–Xing’an Block, which constrains two main Early Paleozoic tectonic events of the Xing-Meng Orogenic Belt: (a) pre-Late Cambrian collision between Erguna–Kerulen Block and Arigin Sum-Xilinhot-Xing’an Block; (b) the Early Paleozoic subduction of Paleo-Asian Ocean and pre-Late Devonian collision between Erguna–Xing’an Block and Songliao-Hunshandake Block.     

大兴安岭西坡银都赋矿岩体LA-ICP-MS锆石U-Pb定年及其成因意义

银都矿床位于内蒙古大兴安岭西坡,为受断裂控制的银多金属矿床。该矿床的岩体主要为石英闪长岩。该岩体中的锆石分为岩浆锆石和热液锆石两类:岩浆锆石无色透明,自形长柱状,具有典型的振荡环带特征;而热液锆石呈浅褐色,半透明—不透明,等轴状,其暗色增生边明显切过了核部岩浆锆石结构。热液锆石相对岩浆锆石具有低Th/U和LREE,高Hf和HREE的特征。银都岩体岩浆锆石的206Pb/238 U加权平均年龄为(451.8±7.8)Ma,属加里东期,为岩体的结晶年龄;热液锆石的206 Pb/238 U加权平均年龄为(337.0±7.7)Ma,属中石炭世,代表了热液作用的年龄。热液锆石年龄表明,该区在337Ma左右经历了一次强烈的热液作用,该期热液作用可能与该区造山峰期的变质作用有关。本区的地质特征和流体包裹体特征表明,本区银矿的形成很可能与这期热液活动密切相关。     

彬长矿区煤层气储层参数及开发潜力

彬长矿区煤的变质程度低,矿井瓦斯涌出量大,瓦斯治理形势日趋严峻。根据矿区地质勘查、井下及煤层气井所获得的地质资料显示,煤层气开发的主要目标4煤层厚度大,分布稳定,煤体结构好,渗透率和气含量相对较高,气含量最高可达6.29m3/t,估算煤层气资源量为132.743×108m3。依据煤层气资源丰度划分,矿区煤层气富集区总面积为87.41km2,资源量为40.06×108m3,主要分布在大佛寺井田,相对富集区主要位于胡家河井田中南部和孟村井田东部,贫气区主要位于孟村井田西部、文家坡井田。综合分析认为研究区煤层气开发地质条件相对较好,属于可以抽采煤层,大佛寺井田为地面煤层气勘探开发最具潜力的地区。     

全安盆地水文地质特征及热水成因分析

在简要分析全安盆地水文地质特征、地下水赋存条件及划分地下水类型基础上,对盆地西部周地—暖水塘地区地下热水形成原因、赋存环境进行研究,认为多期次构造运动形成的断裂、裂隙沟通深部地下热水是盆地热水来源的主要原因;采取地下热水样品并开展氢氧稳定同位素、逸出气体、水化学成份测试,认为地下热水由大气降水补给,长期水动态观测结果也显示大气降水与地下热水关系较密切。     

Correlation analysis and partial least square modeling to quantify typical minerals with Chang＇E-3 visible and near-infrared imaging spectrometer＇s ground validation data

In 2013, Chang＇E-3 program will develop lunar mineral resources in-situ detection. A Visible and Near-infrared Imaging Spectrometer （VNIS） has been selected as one payload of CE-3 lunar rover to achieve this goal. It is critical and urgent to evaluate VNIS＇ spectrum data quality and validate quantification methods for mineral composition before its launch. Ground validation experiment of VNIS was carried out to complete the two goals, by simulating CE-3 lunar rover＇s detection environment on lunar surface in the laboratory. Based on the hyperspectral reflectance data derived, Correlation Analysis and Partial Least Square （CA-PLS） algorithm is applied to predict abundance of four lunar typical minerals （pyroxene, plagioclase, ilmenite and olivine） in their mixture. We firstly selected a set of VNIS＇ spectral parameters which highly correlated with minerals＇ abundance by correlation analysis （CA）, and then stepwise regression method was used to find out spectral parameters which make the largest contri- butions to the mineral contents. At last, functions were derived to link minerals＇ abundance and spectral parameters by partial least square （PLS） algorithm. Not considering the effect of maturity, agglutinate and Fe~, we found that there are wonderful correlations between these four minerals and VNIS＇ spectral parameters, e.g. the abundance of pyroxene correlates positively with the mixture＇s absorption depth, the value of absorption depth added as the in- creasing of pyroxene＇s abundance. But the abundance of plagioclase correlates negatively with the spectral parame- ters of band ratio, the value of band ratio would decrease when the abundance of plagioclase increased. Similar to plagioclase, the abundance of ilmenite and olivine has a negative correlation with the mixture＇s reflectance data, if the abundance of ilmenite or olivine increase, the reflectance values of the mixture will decrease. Through model validation, better estimates of pyroxene, plagioclase and ilmenite＇s abundances are given. It is concluded that VNIS has the capability to be applied on lunar minerals＇ identification, and CA-PLS algorithm has the potential to be used on lunar surface＇s in-situ detection for minerals＇ abundance prediction.     

贵州省瓮福磷矿沉积环境及矿床成因探讨

瓮福磷矿沉积的有利场所是潮下海湾浅滩环境,而不是潮坪。海湾的大小又控制着矿床的规模,海滩能量的差异影响着磷矿石的不同结构成因类型。矿石的结构,从凝胶―细砂屑与砂屑颗粒由细变粗;岩石的颜色由灰褐、黑色(多陆屑、富有机炭及黄铁矿)变为浅灰、灰白色;矿层中P2O5含量随之渐增,而且CaO含量变化与P2O5含量变化同步,说明水动力条件由弱渐强,反映了沉积环境由潮汐作用为主的海湾环境。为此,陡山沱组以浅水碳酸盐优势岩相的地层条件是成磷的前提;温暖、干燥的古气候提供了有利于磷质的析出及沉积;适宜的海滩古地理环境提供了最佳的成矿场所;"黔中隆起"的古构造条件是磷矿的分布及富矿形成的最主要的控制因素。     

陕西小秦岭地区熊耳群火山岩型铁(钛)矿及资源潜力

对小秦岭地区熊耳群地层的分布作了概述。在熊耳群地层分布区划出了坝源—洛源(A区)、三岔—石门(B区)和西峪河—梧桐河(C区)三个火山岩型铁矿资源潜力区。阐述了各潜力区的铁矿成矿条件,对潜在资源量作了测算。预测全区300 m以上铁矿潜在资源量为≥9.4亿吨,钛铁矿≥300万吨。     

新疆塔额盆地各气象要素对水面蒸发影响的敏感性分析

水面蒸发敏感因素的判断,对于干旱区水资源的规划与利用具有重要指导意义。文章以新疆塔额盆地内的塔城市气象站1981—2010年资料为例,采用敏感系数法对研究区多年月均水面蒸发影响因素进行敏感性分析,并与关联分析法分析的结果对比。结果表明：在塔额盆地内,温度与水汽压二因素对水面蒸发影响最为敏感;基于敏感系数法的敏感因素研究结果与关联分析的结果基本一致,尤其在主要影响因子的判定上。     

大兴安岭北段塔源二支线铅锌铜矿区岩浆岩岩石成因及其地质意义

塔源二支线铅锌铜矿床地处额尔古纳地块东南缘,位于得尔布干成矿带东段.为确定塔源二支线铅锌铜矿区岩浆岩的岩石成因及其地质意义,对矿区岩浆岩开展了岩石学、地球化学以及同位素年代学研究.笔者在矿区识别出两期岩浆作用,早期发生于(296.1±2.3)Ma(早二叠世),侵入体为二长闪长岩;晚期发生在(136.5±2.1)Ma(早...