贵州修文红黄铝土矿矿床地质特征及控矿因素

贵州修文红黄铝土矿床位于黔中铝土矿成矿带,铝土矿体产于下石炭统九架炉组中部或中下部,产状与地层产状基本一致。矿石按自然类型可分为碎屑状、半土状、致密状三种,一水硬铝石为主要矿物,为沉积型铝土矿床。通过野外地质观察及资料综合分析,总结了红黄铝土矿地质特征及矿体的变化规律,矿体与含矿岩系的厚度变化呈正相关关系。区内铝土矿严格受地层岩性、构造、岩相古地理、古气候等控矿因素的制约。提出了该区铝土矿找矿标志。     

孙坡—管茅铝土矿矿体特征及找矿标志

通过对河南孙坡—管茅铝土矿含矿岩系特征、矿体特征、矿石质量特征、矿石类型及品级等分析研究,并对矿床成因进行了分析,最终提出找矿标志。即主要为中石炭统本溪组含矿岩系、中奥陶统马家沟组灰岩及矿体露头。     

云南丘北县大铁地区铝土矿地质特征及找矿标志

[摘 要] 大铁一水硬铝石沉积型铝土矿床是云南省丘北地区近年来新发现的中型铝土矿床,在滇 东南地区具有代表性。本文系统地研究了该矿床的地质特征,总结了其成矿规律与找矿标志,探讨了成 矿作用过程。研究表明,大铁铝土矿床含矿岩系为上二叠统吴家坪阶下段,其不整合于上石炭统威宁组 或中-上二叠统峨眉山组之上,为一套海陆交互相以铝质、铁质和粘土质为主的碎屑岩系。矿体赋存于 含矿岩系的中部,矿石类型主要以碎屑状铝土矿为主,其次为鲕状、致密状、半粗糙状铝土矿。铝土矿床 形成于水动力条件相对微弱动荡的低能海岸环境中,潮下带为成矿有利相带,经历了古风化壳发育阶 段、沉积-成岩阶段及表生阶段3个阶段。     

贵州务-正-道地区铝土矿成矿模式与找矿模型

务-正-道铝土矿成矿区位于黔北-渝南接壤地带,现已发现大型铝土矿床10余个,探明资源储量超7亿吨,是贵州重要的铝矿资源地。铝土矿产于下志留统韩家店组碎屑岩或上石炭统黄龙组碳酸盐岩古侵蚀面之上的下二叠统大竹园组中,属古风化沉积型铝土矿床。基于前人成矿物质来源、成矿环境、成矿作用及矿床成因类型的研究成果,进一步探讨了区域构造演化与铝土矿形成的关系,结合典型矿床成矿地质特征,揭示了研究区铝土矿成矿的地质-地球化学演化过程。依据1∶10万~1∶1万遥感影像特征的提取,总结了含矿岩系及相邻层位、主要构造的识别标志,论述了铁化、泥化异常与含矿岩系的空间展布关系,刻画出大比例尺度的遥感三维立体影像模型。通过多个铝土矿区浅层地震反射波法、高密度电阻率法、频率域三极测深法、音频大地电磁测深法、大功率激电测深法等物探方法的应用和对比研究,反演出“高、厚、凹、拐”物探异常找矿标志,建立了典型铝土矿床三维地质-地球物理找矿预测模型。在上述基础上,集成了铝土矿勘查技术方法体系,建立了地质、物探、化探、遥感综合找矿模型,示范指导找矿预测,经工程验证,取得显著的找矿效果,表明建立的找矿模型在该研究区探寻铝土矿适宜、有效。     

河南省荥巩煤田大峪沟矿段深部铝土矿床地质特征及找矿方向

荥巩煤田大峪沟矿段深部铝土矿床是最近找矿突破发现的一个大型铝土矿床。该铝土矿床成矿时代为早二叠世,成矿物源主要为古陆铝硅酸岩风化物,少量为中奥陶统马家沟组碳酸盐岩风化产物,成矿环境为潮坪-沼泽环境,由长期的沉积间断、特定的岩相古地理环境、构造变形和表生风化作用共同控制着矿床的形成;上石炭统本溪组是铝土矿形成的含矿岩系;海湾泻湖相沉积环境是铝土矿床形成的有利条件;下古生界奥陶系、寒武系古岩溶侵蚀面是铝土矿形成的有利场所,古岩溶侵蚀面洼地及漏斗是铝土矿的定位空间。大峪沟矿段铝土矿床成因模式属于"古陆风化+碎屑和化学沉积";成矿机制为机械和化学分异。含矿岩系底部铁质风化壳/铁质黏土岩为碳酸盐岩风化形成,铝(黏)土矿来源于铝硅酸盐岩。大峪沟深部铝土矿床的发现为河南省寻找深部铝土矿床指明了方向。     

黑圆山铁矿床地质特征及扩找矿标志

通过对本区铁矿矿床的研究,主要目的是为了发现本区铁矿床的地质特征和找矿标志。本区铁矿床属火山沉积型铁矿,赋存于下石炭统老爷庙组第二亚组地层中,铁矿与含碳质凝灰岩、凝灰岩以及凝灰质砂岩等围岩共同构成含矿带。主要找矿标志为地层标志、构造标志、地貌标志。     

贵州福泉高洞铝土矿床成矿地质地球化学特征

贵州福泉高洞铝土矿床是近年在贵州新的铝土矿成矿区探明的中型矿床之一,其含矿岩系为下石炭统九架炉组,铝土矿呈层状、似层状产于上泥盆统高坡场组碳酸盐岩古侵蚀面之上,与上覆中二叠统梁山组和下伏上泥盆统高坡场组均呈假整合接触,矿床成因类型为古风化壳沉积型。通过对含矿岩系中敏感元素Ga、Ba、Sr、Th含量及B/Ga、Rb/K、V/Zr比值特征分析,认为铝土矿主要形成于陆相沉积环境;δCe、Ni/Co、Th/U、Sr/Cu、V/Cr特征揭示铝土矿成岩成矿过程主要为氧化环境。含矿岩系中Al与Zr、Hf、Nb、Ta、Th、U等呈正相关性反映出铝土矿成矿过程中具同迁移、显著富集特征;含矿岩系中微量元素含量与下伏高坡场组碳酸盐岩相比,总体成强烈富集态势。与黎彤值对比,含矿岩系中高温成矿元素(W、Sn、Mo、Bi)、高场强元素(Nb、Ta、Th、U、Hf、Zr)、粘土矿物易吸附元素(Li、V)及细碎屑岩中高地球化学背景元素(Sb)富集强度高。LREE与HREE分馏作用明显,推测为次生风化淋滤过程中离子半径较小的HREE向下渗滤迁移的速率大于离子半径较大的LREE所致。     

黔北务正道铝土矿找矿标志及找矿模式

黔北务正道铝土矿产于上石炭统大竹园组的中上部,其成矿时代归属晚石炭世马平期。根据矿床就位机制,铝土矿成因类型划属古风化壳型异地堆积铝土矿床。在总结构造、地层、岩石、矿物、放射性、地貌找矿标志的基础上,建立了找矿模式。认为务正道地区地表工作程度一般较高,今后的主要任务是根据区域性的找矿标志及找矿模式,并遵循“从已知到未知”的原则,预测和重视深部找矿,此乃扩大区域铝土矿远景规模的重要途径。     

豫西北地区铝土矿地质特征及找矿方向

豫西北地区铝土矿均为一水硬铝石型沉积矿床,赋存于中石炭统本溪组.铝土矿含矿岩系的物源主要来自碳酸盐岩的红土风化壳,矿层厚度、矿石结构构造及矿体产状的变化均受古岩溶地貌控制,含矿岩系应属滨海-湖沼相沉积;溶斗型铝土矿小而富,主要分布在豫北地区;层状、似层状铝土矿规模大、品位高,主要分布于豫西地区;豫西的新安、渑池、三门峡、陕县一带和豫北的沁阳、博爱北部是下一步铝土矿的找矿重点区.     

贵州务川－正安－道真地区铝土矿产出地质特征

贵州务川－正安－道真地区铝土矿,目前共发现2个超大型矿床、9个大型矿床、14个中型矿床,估算各级资源储量7×10⁸余t,是贵州乃至全国重要铝土矿产出地。本区含矿岩系与上覆中二叠统梁山组之间有明显的沉积间断;区内含矿岩系岩石类型主要由粘土岩类、铝质岩类和铁质岩类组合而成;矿体赋存在上石炭统大竹园组的中上部,与铝土岩和粘土岩共生,矿体产状与岩层产状一致,矿体形态以层状、似层状为主;矿石自然类型有灰白、浅灰色碎屑状至土状铝土矿,灰、深灰色致密状铝土矿和灰色豆鲕状铝土矿3种;矿石结构有碎屑结构、豆鲕结构、泥晶结构、粉晶结构和碎屑—豆粒复合结构等5种类型,矿石构造有块状和半土状两种构造。通过含矿岩系含矿岩系时代特征、岩石类型、剖面类型、厚度变化及底板灰岩变化、矿体产出形态、矿石的结构、构造等特征阐述,总结了贵州务川-正安-道真地区铝土矿的产出特征。     

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.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ₁ roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).     

NONMETALS DEPOSITS

正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.)     

MATHEMATICAL GEOLOGY

正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology,     

PROSPECTING EXPLORATION

正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.)     

STRUCTURAL GEOLOGY

正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se-     

STRUCTURAL GEOLOGY

正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with     

PALEOZOOLOGY

正20141609 Chen Guiying(College of Earth Sciences,Guilin University of Technology,Guilin 541004,China);Han Nairen New Materials of Stylophora from the Upper Cambrian of the Jingxi Area,Guangxi,South China(Acta Palaeontologica Sinica,ISSN0001-6616,CN32-1188Q,52(3),2013,p.288-293,2 illus.,12 refs.)Key words:Stylophora,Guangxi     

GEOPHYSICS

正20140634 Cao Lingmin(Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China);Xu Yi Finite Difference Tomography of the Crustal Velocity Structure in Tengchong,Yunnan Province(Chinese Journal of Geophysics,ISSN0001-5733,CN11-2074/P,56(4),2013,p.1159-1167,6illus.,35refs.,with English abstract)