内蒙古扎兰屯地区铀成矿多源信息分析与找矿预测

内蒙古扎兰屯地区位于大兴安岭成矿带中段,受植被覆盖厚、自然地理条件复杂、工作程度低等因素影响,铀矿找矿进展较为缓慢。在对扎兰屯地区典型铀矿点控矿因素剖析的基础上,对航放、化探异常、遥感多源铀成矿信息进行了分析,基于GIS层次分析法,构建了研究区火山岩型铀矿预测评价层次分析模型,预测铀成矿远景区7处,其中2处尚未发现铀矿床(点),其成矿地质条件优越,成矿信息丰富,具有较好的找矿前景。     

内蒙古巴升河地区航空伽马能谱异常特征及其铀成矿潜力分析

巴升河位于大兴安岭铀成矿带柴河盆地,以往铀矿找矿研究工作程度极低。通过对区域典型铀矿点航空伽马能谱特征分析,建立了区域火山岩型铀矿化区航空伽马能谱异常标志:航放铀高场、铀增量(ΔU)高值晕、活性铀(Hu)低值晕、航放F参数高值晕。据此,对研究区航空伽马能谱数据进行了处理,对异常特征进行了分析,圈定了5片航放综合异常晕;结合地层、构造、物化探条件,对圈定的5片航放综合异常晕铀成矿潜力进行了研究,发现研究区H01、H02、H03航放综合异常晕具有较好的火山岩型铀成矿潜力。     

二连盆地苏尼特右旗地区HFU-39、40异常特征及找矿意义

为查明二连盆地苏尼特右旗地区HFU-39、HFU-40航放异常的铀成矿情况，本文在分析异常区区域地质资料基础上，采用地质剖面测量、地面伽玛总量测量、伽玛能谱剖面测量、土壤氡剖面测量及岩石化探取样分析综合方法，对HFU-39、HFU-40两个异常进行查证及评价。查证结果显示异常呈团块状展布，地面伽玛能谱测量铀含量最高达w（U）=135×10^-6，岩石化学分析铀含量最高达w（U）=256×10^-6，该区域氡异常突出；综合异常查证结果和对二连盆地泥岩型铀矿化的形成环境分析，指出了该区的下一步铀找矿方向。     

内蒙古介拉斯台盆地铀成矿条件分析与找矿预测

介拉斯台盆地处于扎兰屯火山岩型铀成矿远景带中段，是国内中生代火山岩最为发育地区之一，多期次断裂、火山活动强烈发育，铀成矿地质背景优越。文章通过对介拉斯台中生代火山岩盆地的大地构造背景、基底和盖层的含铀性、潜火山岩、断裂、火山机构、热液蚀变、铀矿化等铀成矿地质条件研究，并结合航放、化探及遥感找矿信息进行综合分析，认为介拉斯台中生代火山岩盆地具有较好的铀成矿潜力，圈定成矿远景区5处。     

内蒙古东沟营盆地铀成矿多源信息分析与远景预测

内蒙古东沟营盆地位于扎兰屯铀成矿远景带北段，铀成矿地质条件优越.受林区覆盖厚、交通不便等因素制约，铀矿地质调查工作程度低，找矿进展缓慢.在区域铀成矿地质背景分析的基础上，通过对典型铀矿点控矿因素进行剖析，结合航空放射性、地球化学、遥感多源铀成矿信息，构建了火山岩型铀矿综合找矿模型.类比邻区典型火山岩型铀矿床，开展找矿远景分析，认为研究区具备较好的找矿前景.依据找矿模型，结合地质、物化遥综合找矿信息，圈定铀成矿有利区段4处.其中新圈定成矿有利区段3处，其成矿地质条件优越，找矿线索丰富，找矿前景较好.     

林西—乌兰浩特地区铀成矿多源信息分析与成矿预测

林西—乌兰浩特地区位于大兴安岭铀成矿省中南段,构造岩浆活动强烈,铀成矿地质条件优越。限于植被发育、覆盖厚等因素制约,单一勘查手段难以满足当前深部找矿的需求。在成矿条件及控矿因素分析的基础上,综合航放、航磁、地球化学、遥感等多源信息,构建了火山岩型铀矿综合找矿模型。利用地理信息系统(GIS)空间分析功能,提取了多源找矿信息,采用证据权重法开展铀矿定量预测,优选了与成矿密切相关的16个证据层。其中上侏罗统满克头鄂博组为主要赋矿地层;晚侏罗世—早白垩世潜火山岩与成矿关系密切; NE-NNE向断裂控矿作用显著,铀矿化多发育在断裂密集带及交切带;航放参数异常(U高场、F高值晕、U/K高值晕、Hu低值晕)、化探异常(Mo、Ag、Pb、W、Sn)及遥感蚀变异常(铁染异常、羟基异常)对铀矿化指示作用明显。依据证据权重法确定的后验概率圈定成矿远景区18处,覆盖了区内多数铀矿床(点),表明预测结果较为可靠,其中7处成矿远景区内尚未发现铀矿床(点),其成矿地质条件优越,找矿线索丰富,找矿前景较好,对进一步找矿具有一定的指导意义。     

盛源盆地放射性水化学特征研究及找矿意义

盛源盆地位处赣杭铀成矿带中段,是华东地区重要铀矿田之一。在收集和分析大量放射性水化学特征数据基础上,运用统计分析及信息复合技术,详细研究了盆地放射性水化异常与已知铀矿化的关系,总结了放射性水化学找矿规律。认为铀-氦高值晕是成矿标志,铀-氡高值晕是近矿标志,单铀型水异常晕较好反映铀矿化的局部富集,氦水异常反映隐伏构造存在,可指示攻深找盲。据此,圈定Ⅰ、Ⅱ级成矿远景区各1处,Ⅲ级远景区3处,为盆地今后铀矿找矿提供了依据。     

大兴安岭乌兰哈达地区铀矿找矿进展与找矿预测

内蒙古乌兰哈达地区位于大兴安岭林西-扎兰屯多金属成矿带上,属于扎兰屯火山岩型铀成矿远景带。通过1/5万伽玛能谱测量工作发现工区内古生代、中生代地层U背景值1.88×10-6～2.54×10~(-6),海西期花岗岩U背景值为3.74×10~(-6),具备很好的铀源条件。该区断裂构造及层间破碎带发育,为铀矿运移提供通道和沉淀的场所。粘土矿化、萤石化等热液蚀变发育,可以作为铀矿找矿的热液蚀变标志。通过放射性测量工作圈定9处铀异常区,发现2处铀矿化带,圈定了2个找矿靶区,为该地区铀矿找矿指明了方向。     

花岗岩型铀矿勘查中航放信息的提取与综合

采取线性与非线性的航放信息提取方法相结合的方式,对桃山地区的航空放射性测量数据进行了处理,在很大程度上有效地提取出与花岗岩型铀矿化密切相关的航放异常信息,建立了花岗岩型铀矿的航放找矿标志,并运用成矿有利度法完成了该区铀成矿潜力评价。已知铀矿含矿单元的正判率达86.4%,表明所建立的找矿标志及评价模型可靠,可用于未知区的铀成矿远景预测。     

基于GIS的层次分析法在沽源地区铀成矿预测中的应用

在分析了沽源地区铀矿床成矿地质特征的基础上,总结了区域铀矿找矿标志,提取了各类找矿信息,利用GIS的空间分析功能分别提取了地层、构造、潜火山岩、热液蚀变、化探异常、航磁异常、航放异常等14个有利分析因子,建立了层次分析模型,并根据该区成矿概率的分布进行了成矿远景区的预测,圈定Ⅰ级远景区2个、Ⅱ级远景区7个、Ⅲ级远景区5个,为在沽源地区开展进一步铀矿找矿奠定了基础。     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

Inter-regional correlation of transgressions and regressions in the Cretaceous period

Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous.     

The lamprophyres of Afyon stratovolcano,western Anatolia,Turkey: description and genesis

The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism.     

METAMORPHIC PETROLOGY

正20140751 Guo Xincheng(Geological Party,BGMRED of Xinjiang,Changji 831100,China);Zheng Yuzhuang Determination and Geological Significance of the Mesoarchean Craton in Western Kunlun Mountains,Xinjiang,China(Geological Review,ISSN0371-5736,CN11-1952/P,59(3),2013,p.401-412,8     

GEOCHEMICAL EXPLORATION

正20141058 Chen Ling(Key Laboratory of Mathematical Geology of Sichuan Province,Chengdu University of Technology,Chengdu610059,China);Guo Ke Study of Geochemical Ore-Forming Anomaly Identification Based on the Theory of Blind Source Separation(Geosci-     

SEISMIC GEOLOGY

正20141334 Chen Kun(Institute of Geophysics,China Earthquake Administration,Beijing100081,China);Yu Yanxiang Shakemap of Peak Ground Acceleration with Bias Correction for the Lushan,Sichuan Earthquake on April20,2013(Seismology and Geology,ISSN0253-4967,CN11-2192/P,35(3),2013,p.627-633,2 illus.,1 table,9 refs.)Key words:great earthquakes,Sichuan Province     

HISTORICAL GEOLOGY & STRATIGRAPHY

正20141624 Cai Xiongfei(Key Laboratory of Geobiology and Environmental Geology,Ministry of Education,China University of Geosciences,Wuhan 430074,China);Yang Jie A Restudy of the Upper Sinian Zhengmuguan and Tuerkeng Formations in the Helan Mountains(Journal of Stratigraphy,ISSN0253-4959CN32-1187/P,37(3),2013,p.377-386,5 illus.,2 tables,10 refs.)     

PALEONTOLOGY

正20142263Lü Shaojun(Geological Survey of Jiangxi Province,Nanchang 330030,China)Early-Middle Permian Biostratigraphical Characteristics in Qiangduo Area,Tibet(Resources SurveyEnvironment,ISSN1671-4814,CN32-1640/N,34(4),2013,p.221-227,2illus.,2tables,22refs.)Key words:biostratigraphy,Lower Permian,Middle Permian,Tibet     

MATHEMATICAL GEOLOGY

正20142560Hu Hongxia(Regional Geological and Mineral Resources Survey of Jilin Province,Changchun 130022,China);Dai Lixia Application of GIS Map Projection Transformation in Geological Work(Jilin Geology,ISSN1001-2427,CN22-1099/P,32(4),2013,p.160-163,4illus.,2refs.)     

GEOCHEMISTRY

正20140692 Duo Tianhui(No.402 Geological Team,Exploration of Geology and Mineral Resources of Sichuan Authority,Chengdu611730,China);Wang Yongli Computer Simulation of Neptunium Existing Forms in the Groundwater(Computing Techniques for Geophysical and Geochemical Exploration,ISSN1001-1749,CN51-1242/P,35(3),