全国学术讨论会图片报道

由中国地质学会岩溶地质专业委员会等七个学术机构主办、中国地质科学院岩溶地质研究所等两家科研单位承办的“高分辨率记录与同位素技术在环境变化研究中的应用”全国学术讨论会于2004年9月21-23日在桂林隆重举行。来自美国、我国台湾及内地的130多位代表出席了本次会议。     

鹅湖岩体岩石谱系单位的建立及其就位机制分析

鹅湖岩体为S型花岗岩 ,具有结构和成分演化序列。运用岩石结构序列法 ,将其划分为 5个单元 ,归并为 1个超单元。按侵入体空间展布形式、岩体地质学、岩石学、构造等资料 ,探讨了岩体就位机制     

固体地球系统复杂性与地质过程动力学学术讨论会纪要

20 0 4年3月6～7日,由中国矿物岩石地球化学学会和中国地质大学(武汉)联合主办的“全国固体地球系统复杂性与地质过程动力学”研讨会在武汉召开,来自美国加州大学SanDiego分校、瑞典Upsala大学、中山大学、中南大学、西北矿业公司、中石化、中石油、地质科学院、中国地质大学(北京、武汉)的5 0余位代表及中国地质大学的众多研究生参加了讨论会。中国地质大学张锦高校长到会并致开幕词。会上31位代表作了学术报告。於崇文院士作了“地质系统复杂性”的主题报告。於院士归纳总结了自然科学研究程度由浅入深的4个层次,从地质科学发展的现状出…     

中德新疆古生物、地质演化及环境变迁学术研讨会在乌鲁木齐举行

由中国吉林大学、德国图宾根大学主办，新疆地质矿产局第一区调大队协办的“中德新疆古生物、地质深化及环境变迁学术研讨会”于2004年4月25日-29日在乌鲁木齐举行．参加会议的有来自中国、德国和美国的地质学家．新疆维吾尔自治区副主席艾力更，依明巴海接见了会议代表并发表了讲话，中国科学院院士李廷栋致了开幕词。     

“Three-Component” Digital Prospecting Method：A New Approach for Mineral Resources Quantitative Prediction and Assessment

“Three-component” method consists of three clase-connected aspects: geological anomaly,diversity of mineralization and mineral deposit spectrum. All these three concepts are not new separately, but it is a new approach to combine these three aspects in one single concept for quantitative mineral resources prediction and assessment and it is also the first time to conduct a more detailed study in each aspect. Investigation and clarification of geological anomalies, diversity of mineralization and spectrum of mineral deposits are realized by digitization and quantification of ore forming controlling factors, oreexisting symbols or marks, characteristics of mineralization and regulation of ore-genesis and laws of distribution. These procedures lead to construction of a “digital model“ for mineral resources prediction andassessment.     

Late-Stage Ductile Deformation in Xiongdian-Suhe HP Metamorphic Unit, North-Western Dabie Shan, Central China

New structural and petrological data unveil a very complicated ductile deformation history of the Xiongdian-Suhe HP metamorphic unit, north-western Dabie Shun, central China. The finegrained symplectic amphibolite-facies assemblage and coronal structure enveloping eclogite-facies garnet,omphacite and phengite etc., representing strain-free decompression and retrogressive metamorphism,are considered as the main criteria to distinguish between the early-stage deformation under HP metamorphic conditions related to the continental deep subduction and collision, and the late-stage deformation under amphibolite to greenschist-facies conditions occurred in the post-eclogite exhumation processes.Two late-stages of widely developed, sequential ductile deformations D3 and D4, are recognized on the basis of penetrative fabrics and mineral aggregates in the Xiongdian-Suhe HP metamorphic unit, which shows clear, regionally, consistent overprinting relationships. D3 fabrics are best preserved in the Suhe tract of low post-D3 deformation intensity and characterized by steeply dipping layered mylonitic amphibolites associated with doubly vergent folds. They are attributed to a phase of tectonism linked to the initial exhumation of the HP rocks and involved crustal shortening with the development of upright structures and the widespread emplacement of garnet-bearing granites and felsic dikes. D4 structures are attributed to the main episode of ductile extension (D^24) with a gently dipping foliation to the north and common intrafolial, recumbent folds in the Xiongdian tract, followed by normal sense top-to-the northductile shearing (D^24) along an important tectonic boundary, the so-called Majiawa-Hexiwan fault (MHF), the westward continuation of the Balifan-Mozitan-Xiaotian fault (BMXF) of the northern Dabie Shan. It is indicated that the two stages of ductile deformation observed in the Xiongdian-Suhe HP metamorphic unit, reflecting the post-eclogite compressional or extrusion wedge formation, the subhorizontal ductile extension and crustal thinning as well as the top-to-the north shearing along the high-angle ductile shear zones responsible for exhumation of the HP unit as a coherent slab, are consistent with those recognized in the Dabie-Sulu UHP and HP metamorphic belts, suggesting that they were closely associated in time and space. The Xiongdian-Suhe HP metamorphic unit thus forms part of the Triassic(250-230 Ma) collision orogenic belt, and can not connect with the South Altun-North Qaidam-North Qinline UHP metamorphic belt formed durin~ the Early Paleozoic (500-400Ma).     

旅游地质环境地质厅

大自然恩赐给我们丰富的宝藏还造就了新疆众多的秀丽山川的美景令人神往。精美的图片、微缩的景观模型……，带给人们以违遐想与神往。     

天津地质研究院简介

天津地质研究院是原冶金工业部直属科研院所，1999年转制为科技型企业，进入中国钢铁工贸集团公司。     

尤溪县太华山金银矿成矿地质条件探讨

通过分析太化山金银矿的区域地质特征、矿区及矿床地质特征，总结出其成矿地质条件有4点：一是要有聚水性的地层，即要有一套有利于矿液渗透环流成矿的含水岩系；二是要有开放性的构造条件；三是火山热液活动要有脉动性；四是要有标志性的地球化学异常组合特征，其中As-Sb-Hg是特征的指示元素组合。