四川省铁矿物自然重砂异常圈定及其指示意义

在四川省矿产资源潜力评价工作中,以四川省1∶20万自然重砂测量数据为基础,简要介绍了自然重砂数据库系统(ZSAPS2.0)平台下自然重砂铁矿物的选择、异常下限的确定、异常圈定及异常的分级原则。通过对四川省省级及预测工作区铁矿物自然重砂异常的分析认为,自然重砂铁矿物异常对某些地区及某种成矿类型的铁矿成矿预测具有一定的指示作用,并可作为综合找矿信息因子参与铁矿成矿预测。     

自然重砂异常在云南西邑铅锌矿找矿中的意义

自然重砂测量是矿产勘查的重要手段之一,提取自然重砂异常中的矿化信息与区域地质、成矿事件之间的内在联系,对揭示区域成矿规律和预测潜在矿床具有重要的意义。云南西邑铅锌矿床是全国资源潜力评价中,通过自然重砂异常并结合其他找矿方法实现找矿突破的成功案例。报道了西邑铅锌矿床自然重砂异常的基本特征,探讨了矿床有关自然重砂异常特征及其在西邑铅锌矿找矿突破过程中的重要作用。     

湖南省钨矿资源预测与远景区划

湖南省钨矿资源预测是"全国矿产资源潜力评价"项目的阶段性成果。在成矿系列理论的指导下,结合基础地质、区域成矿规律研究,利用物探、化探、自然重砂和遥感解译的综合找矿信息,运用GIS技术,实现全省钨矿资源潜力预测评价。本文拟从成矿地质背景、钨矿矿床类型、资源预测三方面进行阐述,圈定湖南省钨矿重点勘查远景区,为实际工作提供依据。全省共划分出19个重点勘查远景区,分布在资兴-郴州一带的勘查区找矿前景良好。     

山门金银矿床重砂异常特征及找矿意义

本文通过对山门金银矿床自然重砂矿物的系统研究,揭示了山门金银矿床自然重砂异常的分布特征,优选出具有重要找矿指示作用的重砂矿物,并确定标型矿物组合,结合地质特征建立山门金银矿床的自然重砂找矿模式,为找矿预测提供重要依据。     

吉林夹皮沟金矿带自然重砂异常特征及其找矿意义

通过对吉林夹皮沟金矿带自然重砂矿物的系统研究,揭示了成矿带内自然重砂异常的分布特征,优选出具有重要找矿指示作用的重砂矿物,并确定标型矿物组合,结合地质特征建立夹皮沟成矿带的自然重砂找矿模式,为找矿预测提供重要依据。     

天津蓟县地区金、钨、钼矿自然重砂与地球化学区域找矿方法效果

结合蓟县地区矿产分布特征,应用1∶20万自然重砂和1∶5万水系沉积物地球化学找矿方法,在蓟县地区金矿、钨矿、钼矿中进行区域找矿方法效果研究。研究其异常分布特征,发掘出了新的找矿信息。研究发现,所圈出的自然重砂和地球化学异常能直接指示相应地质体的含矿性,特定矿物组合的自然重砂异常和区域地球化学异常在某些区域分布上比较吻合,二者均具有找矿指示作用。     

中南地区矿产资源潜力评价主要成果与认识

“中南地区矿产资源潜力评价”项目按照《全国矿产资源潜力评价技术要求》的统一规定,对中南地区铁等20个重要矿种,从成矿地质背景、地球物理、地球化学、遥感、自然重砂、成矿规律、资源预测、成矿作用和找矿方向等方面进行了全面、系统的资料汇总和综合研究; 在分析重要矿产的成矿地质背景和划分构造单元的基础上,提出了对扬子陆块与武夷-云开造山带西南段界线等的新认识及其证据; 通过总结区内不同大地构造相、不同时代重要矿产的成矿作用和时空分布规律,圈定了物探、化探、遥感和自然重砂的各类综合异常,编制了系列图件,研建了各类数据库系统; 客观评价和定量预测了重要矿产的资源潜力,圈定了找矿远景区,指出了找矿方向。该项目取得的各项成果为今后开展更加深入的区域成矿规律研究和矿产勘查提供了翔实可靠的地质依据。     

面金属量法在香格里拉地区铜多金属矿资源潜力定量评价应用

基于成矿地质背景分析和典型矿床研究,以斑岩型铜多金属矿优势矿产为目标,以出露和根据重磁、地球化学、遥感资料推测的中酸性隐伏岩体为基础,结合断裂构造,重力、航磁和遥感线性解译构造,水系沉积物测量成矿元素异常、铜矿物重砂异常汇水盆地,定性圈定了评价矿种的45个找矿有利地段,运用面金属量法对各找矿有利地段评价矿种潜在资源量进行估算,并与该区综合成矿信息找矿预测证据权重模型圈定预测远景区对比,从量的角度提出该区铜多金属矿找矿潜力和具有大型规模远景的找矿有利地段,为生产一线矿产勘查工作部署提供定量找矿潜力科学依据。     

中国自然重砂分布特征及其意义

通过全国资源潜力评价,结合各省自然重砂资料和全国重砂资料汇总成果,对85个常见自然重砂矿物进行统计分析。研究表明,中国自然重砂矿物复杂多样,重砂矿物分布具有明显的区域性特点。造山带中自然重砂矿物产出数量相对较多且密度较大,而稳定地区重砂矿物相对较少。不同的自然重砂矿物及其组合具有明显的找矿信息,单矿物自然重砂可能来源于相对单一的矿石或岩石,其异常范围表明与其相关的矿产可能具有较好的成矿远景;矿物组合常显示出有关矿床的成因信息。自然重砂矿物与源区岩石或矿石具有密切的成因联系,对指导矿产勘查与研究具有十分重要的意义。     

江西南岭成矿带自然重砂异常特征及其找矿潜力

南岭成矿带位于江西省西南部,是该省重要的钨、锡、稀土自然重砂异常带。带内单矿物重砂异常形态复杂,受自然地理条件控制显著,与花岗岩体和已知矿产地之间关系密切,组合异常总体呈北北东向展布,与区域构造线方向一致。根据地质构造背景及自然重砂组合异常特征,进一步划分出2个次级自然重砂异常带和14个自然重砂异常集中区。区内自然重砂异常充分展现了矿产资源潜在前景,为开展矿产资源调查与评价提供了重要的重砂异常信息标志。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.     

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.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H₂O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H₂O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.     

Late Wuchiapingian (Late Dzhulfian,early Late Permian) limestone olistolites within the Tertiary flysch of Glypia Unit (Mount Parnon,central–eastern Peloponnesus,Greece)

Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931.     

PALEONTOLOGY

正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.)     

GEOCHEMICAL EXPLORATION

正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.)     

MICROPALAEONTOLOGY

正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.)     

PETROLOGY

正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus.,     

ENVIRONMENTAL GEOLOGY

正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an     

PROSPECTING EXPLORATION

正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of