陕南紫阳-平利地区碳硅泥岩型铀矿床成矿条件分析

陕南紫阳一平利地区位于南秦岭碳硅泥岩型成矿带石泉～安康成矿集中区,铀成矿地质条件较为有利。已发现有碳硅泥岩型铀矿床（点）、矿化点及分布广泛的异常点。铀矿化受寒武系鲁家坪组（∈1l）、箭竹坝组（∈lj）和奥陶一志留系斑鸠关组（（O3＋S1）6）中碳硅泥岩地层控制。按含矿围岩将铀矿化分为3种类型,即含炭质硅岩型、石炭及炭质板岩型和煌斑岩脉型。褶皱构造和构造破碎带控制着铀矿化分布空间。     

南秦岭铀成矿带铀矿化特征与找矿前景

南秦岭铀成矿带含铀层位主要是志留系迭部群、舟曲群、白龙江群,总体为一套海相碳硅泥岩建造。主要岩性为灰岩、炭质板岩、炭硅质板岩、硅质岩、硅灰岩,总厚5000—9000m。铀矿床（点）矿化类型以层控热水改造碳硅泥岩型为主,次为层控炭硅泥岩型。铀成矿以燕山晚期-喜山期为主。铀矿化在空间上可划分为迭部、舟曲-武都、文县-康县矿化集中区。铀矿体的空间展布具有分段集中,成群集结的特点。含铀层位分布广,厚度大,铀源丰富,铀矿床（点）带多且工作程度低,找矿前景好。     

河西走廊及邻区铀成矿基本规律与找矿方向

在区域地质背景分析的基础上，依据赋矿主岩，将区内铀矿床（点）划分为花岗岩型、砂岩型、火山岩型、变质岩型和碳硅泥岩型5种铀矿化类型。分析研究了铀矿床（点）的时间和空间分布特征。总结指出了铀成矿对围岩时代没有专属性、铀成矿对建造类型具有选择性、铀成矿时间上具有阶段性和铀矿床（点）空间上具有区域性集中和同类型相聚的基本特点和规律，指出了区内今后的找矿方向。     

中国碳硅泥岩型铀矿地质工作回顾与发展对策

“碳硅泥岩型铀矿床”是我国铀矿地质工作者建立的铀矿类型,指“产于未变质或弱变质海相碳酸盐、硅质岩、泥岩及其过渡型岩类中的铀矿床”。它是我国重要的工业铀矿类型之一,现已探明了一批铀矿床,基本查明其时空分布规律和矿化特征,积累了丰富的勘查经验。虽然其矿石经济效益较差,但仍是可利用的铀资源。基于碳硅泥岩型铀矿具有很大的找矿潜力,为满足我国核电发展对铀原料的需求,应将碳硅泥岩型铀矿列入铀矿地质发展规划,按其经济性区别对待,分步骤开展相应的研究和勘查工作。     

古龙岗、坪溪铀矿化集中区铀成矿特征及远景评述

大王山-于山铀成矿带为华南典型的化岗岩型铀成矿带，位于江两中南部乐安-于都一带．总体呈北北东向展布．北段近南北．南段略偏西。铀矿主要产于燕山期花岗岩体内及儿外接触带。铀矿床、矿点、矿化点主要分布在桃山矿川、古龙岗矿化集中区和坪溪矿化集中区内，儿余地区仅有零星矿点、矿化点产…。奉文通过对人li山一十山铀成矿带之古龙岗、坪溪两个铀矿化集中区的成矿地质背景、成矿特征分析．认为古龙岗铀矿化集中区成矿地质背景良好．具有较好的铀矿找矿远景．并指…坪溪铀矿化集中区必须运用新的地质理论、新的探矿手段方能取得找矿新突破。     

准噶尔盆地顶山地区乌伦古河组砂岩元素地球化学特征及其地质意义

准噶尔盆地顶山地区乌伦古河组发育有砂岩型铀矿化,为对进一步勘探提供理论依据,详细研究了铀矿化的物源,探讨了成矿地质背景。本文对采自顶山地区的32件样品进行了详细的元素地球化学研究。结果表明,乌伦古河组砂岩组分受源岩控制,经历了较弱的沉积再循环作用,物源距离适中;沉积物源为长英质火山岩和安山岩混合来源;沉积物源区为大陆岛弧构造背景。综合分析认为:寒武纪-早志留世,北准噶尔洋伸展-消减旋回,形成了加里东期大陆岛弧中性-酸性侵入岩体;晚志留世-早石炭世,克拉美丽有限洋盆拉张聚敛旋回,形成了海西期大陆岛弧中性-酸性侵入岩体。新第三纪加里东期和海西期大陆岛弧中性-酸性侵入岩体遭受风化剥蚀,于乌伦古凹陷沉积形成乌伦古河组碎屑沉积岩。     

广西铀矿资源特征与找矿潜力分析

广西是中国最早发现铀矿物的地区,铀矿资源丰富,种类齐全,探明的铀矿资源储量位居全国前列。文章通过对广西花岗岩型、碳硅泥岩型、砂岩型、火山岩型及其他类型铀矿床特征及典型铀矿床分析,总结了广西铀矿的时空分布规律,认为铀矿床成矿时间集中于燕山晚期和喜山早期,花岗岩型、碳硅泥岩型、砂岩型铀矿床形成时间较赋矿围岩晚,铀成矿时间与围岩形成时代无关。根据广西铀矿成矿特征及时空分布规律以及广西铀矿成矿带划分方案,将广西铀成矿单元划分为8个Ⅳ级成矿区带,认为广西铀资源类型多样,铀成矿地质条件有利,找矿潜力巨大。     

华乐铀矿地质概况及其成矿远景

华东苏、浙，皖，赣，沪地区，总面积约52．3万平方公里，经过四十五年铀矿勘查，探明铀矿床一百余年，矿（化）点八百余处。铀矿类型主要是火岩岩型和花岗岩型，占矿床总数百分之八十以上，其次为砂岩型，碳硅泥岩型及碱性岩型等铀矿床。表明华东地区铀成矿地质条件良好，矿床类型多，分布广，铀资源丰富。尤其是江西的铀矿资源在全国占重要地位。     

若尔盖地区碳硅泥岩型铀矿床成矿机理研究

<正>若尔盖铀矿田位于秦岭褶皱带南亚带。碳硅泥岩型铀矿是我国一种新的铀矿类型,现已成为我国四大类型(花岗岩型、火山岩型、砂岩型、碳硅泥岩型)铀矿之一。自西向东,目前已探明铀矿床10余个,矿(化)点20余处,具有品位富,多种伴生金属元素可供综合利用的特点,是中国具有较好发展前景的碳硅泥岩型铀矿田。     

根据重磁场研究讨论桂北地区的铀成矿特点

桂北地区的重磁场与铀矿化有着密切的联系，地球物理场的特征反映了与铀成矿有关的地质环境。研究表明，桂北地区的铀矿化主要有如下一些明显的特点；（ｌ）铀矿化位于不同规模的地球物理场或异常的边缘，尤其是大规模的铀矿化产在区域重力低异常（对应于地壳增厚区即地幔拗陷区）的边缘；（２）深部地质作用如莫霍面的起伏、深部大规模的岩浆活动和深断裂作用是铀成矿的重要控制因素；（３）花岗岩体不仅是花岗岩型铀矿化，而且也是碳硅泥岩型铀矿化的铀源体，且岩浆的动力场愈强烈，岩体的铀含量愈高，对铀成矿愈有利；（４）与铀成矿有关的热液流体为非岩浆成因，具有很强的去碰能力，花岗岩为热液循环提供动力；（５）与铀矿化密切共生的黄铁矿主要源于岩体的“磁性壳”；（６）铀矿床形成于中－低温、浅地表的地质环境。     

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),