Oligocene to Lower Pliocene deposits of the Norwegian continental shelf,Norwegian Sea,Svalbard, Denmark and their relation to the uplift of Fennoscandia: A synthesis

This study provides the results of the first integrated study of Oligocene–Pliocene basins around Norway.Within the study area, three main depocentres have been identified where sandy sediments accumulated throughout the Oligocene to Early Pliocene period. The depocentre in the Norwegian–Danish Basin received sediments from the southern Scandes Mountains, with a general progradation from north to south during the studied period. The depocentre in the basinal areas of the UK and Norwegian sectors of the North Sea north of 58°N received sediments from the Scotland–Shetland area. Because of the sedimentary infilling there was a gradual shallowing of the northern North Sea basin in the Oligocene and Miocene. A smaller depocentre is identified offshore northern Nordland between Ranafjorden (approximately 66°N) and Vesterålen (approximately 68°N) where the northern Scandes Mountains were the source of the Oligocene to Early Pliocene sediments. In other local depocentres along the west coast of Norway, sandy sedimentation occurred in only parts of the period. Shifts in local depocentres are indicative of changes in the paleogeography in the source areas.In the Barents Sea and south to approximately 68°N, the Oligocene to Early Pliocene section is eroded except for distal fine-grained and biogenic deposits along the western margin and on the oceanic crust. This margin was undergoing deformation in a strike-slip regime until the Eocene–Oligocene transition. The Early Oligocene sediments dated in the Vestbakken Volcanic Province and the Forlandssundet Basin represent the termination of this strike-slip regime.The change in the plate tectonic regime at the Eocene–Oligocene transition affected mainly the northern part of the study area, and was followed by a quiet tectonic period until the Middle Miocene, when large compressional dome and basin structures were formed in the Norwegian Sea. The Middle Miocene event is correlated with a relative fall in sea level in the main depocentres in the North Sea, formation of a large delta in the Viking Graben (Frigg area) and uplift of the North and South Scandes domes. In the Norwegian–Danish Basin, the Sorgenfrei-Tornquist Zone was reactivated in the Early Miocene, possibly causing a shift in the deltaic progradation towards the east. A Late Pliocene relative rise in sea level resulted in low sedimentation rates in the main depositional areas until the onset of glaciations at about 2.7 Ma when the Scandes Mountains were strongly eroded and became a major source of sediments for the Norwegian shelf, whilst the Frigg delta prograded farther to the northeast.     

南海海底稀土元素研究进展

<正>稀土作为以新工艺、新技术研发为代表的高新科技产业发展所必需的基础性材料具有重要的经济价值和战略意义。鉴于陆上稀土资源的特殊分布的特点,海洋势必将成为未来该资源探索和开发的新区域。南海作为我国所辖最大面积的海域,其稀土资源丰富。因此,对于该海域稀土元素的研究具有重要的科研意义和现实价值。本文主要对近几十年来相关研究所取得研究成果和进展情况进行综述,并给出了未来研究的展望。     

新亚欧大陆桥(中国段)沿线典型矿床(田)的遥感地质分析

被誉为“黄金走廊”的新亚欧大陆桥(中国段)沿线地带,矿产资源十分丰富,尤其以能源、有色金属、贵稀金属矿产最为丰富,并在全国占有十分重要的位置。作者在对全线矿产资源进行遥感调查的基础上,对几种大型矿产(田)的遥感地质特征进行系统的分析论述。     

麻栗坡三保银多金属矿床

田蓬组地层成矿元素高背景值,为有利之矿源层。加里东期~印支期区域变质作用与成矿密切相关。变质热液长期、持续作用,矿源层内成矿元素随热液迁移,有利赋矿部位富集改造形成层控矿床。     

沉积喷流型矿化的岩石学证据——以大兴安岭南段黄岗和大井矿床为例

沉积喷流型矿床往往有各种喷流岩（热水沉积岩）的共生，正确识别这些喷流岩经常能为认识矿床的成因提供关键证据。大兴安岭南段是我国北方著名的锡－多金属成矿区，燕山期火山－侵入岩广泛出露，因此认为区内矿床大都是与燕山期岩浆活动有关的热液矿床。但是，区内近90％的矿床却产在二叠纪地层中，显示了与二叠纪沉积地层的密切联系。本文以其中的黄岗铁－锡矿床和大井锡－多金属矿床为例，对与矿石密切共生的热水沉积岩开展了系统的地质学、岩相学、矿物学和组构学研究，并结合必要的地球化学数据，证明大兴安岭南段在二叠纪沉积盆地演化过程中可能普经有重要的水下热液沉积喷流成矿作用发生，尽管历来被人们所忽视，但其重要性可能并不亚于燕山期的岩浆热液成矿作用。黄岗矿床的层状矽卡岩与二叠纪海底火山活动关系密切，是一种很具特色的喷流岩；而被误认为是燕山期流纹斑岩的大井矿床菱铁织云硅质岩可能是一种产在陆相断陷盆地、与锡铜铅锌银多金属矿化有关的新类型热水沉积岩。显然，与热水沉积喷流矿床紧密共生的热水沉积岩是认识该类矿床至为重要的岩石学证据之一。     

中国的大洋多金属结核及沉积物标准物质系列

1986～1996年间我国研制了两批共６个海洋地质标准物质：3个多金属结核标准物质GSPN-1～3和3个深海沉积物标准物质GSMS-1～3,形成了两个标准物质系列。与美国、俄罗斯、印度和日本的同类标准物质相比,这些标准物质的主要特点是：①实用性强：这些样品主要取自世界上锰结核最富集、也是各国“先驱投资者”开辟区最集中的太平洋CC区;②系列性好：这些样品还可与美、俄的标准物质构成既具有较大的元素浓度范围又具有适当浓度梯度的标准系列;③被测定组分多（达79个）,定值组分达63个。其中包括58个组分的保证值和5个组分的参考值,全组分的加和均在99.5％～100.1％之间;④参加合作的国家数和实验室多:有18个国外实验室和包括台湾大学在内的14个国内实验室参加了合作分析。这就使这些标准物质具有较大的国际影响。     

Heavy Minerals Concentration along the Baluchistan Coast, Pakistan from Gadani to Phornala

Sorting and concentration of a variety of heavy minerals along the coast between Gadani and Phornala, Baluchistan, are facilitated by the coincidence of the periods of maximum turbulence and wave activity, maximum percipitation, and sediments discharge. Sediment samples from different intertidal zones between Gadani and Phornala were collected for grain size analysis and petrographic/petrological study. Variations in grain size and mineral assemblage in the intertidal zones have been noted. Concentration of dark color heavy minerals has been noted in fine grain sediments, light color minerals are ubiquitous. The sediments exhibit wide ranges of sorting.     

广西罗维钨铋多金属矿床构造与成矿关系研究

广西罗维钨铋多金属矿床是西大明山地区近年来找矿突破战略行动中新发现的一个中型矿床,且2013年12月研究区内两个钻孔在矿体的下部打到了隐伏花岗闪长岩岩体,证实了此前认为在西大明山深部有隐伏岩体的推测,为区内与岩浆活动有关的热液矿床的研究提供了有利条件。本文在充分搜集、分析研究区已有地质资料的基础上,通过扎实地野外调查和室内分析,总结了罗维钨铋多金属矿床中构造与矿化特征之间的关系,探讨了钨铋多金属矿床的成因。     

内蒙古蛤蟆石铅银钼多金属矿矿床地质特征

内蒙古阿鲁科尔沁旗蛤蟆石铅银钼多金属矿地处内蒙古大兴安岭成矿带中南段,西拉木伦河断裂以北,工作和研究程度低,通过普-详查工作首次对该矿床有了较为正确、系统的认识。对矿区地质特征、矿体地质特征、矿石地质特征及成矿要素进行了初步分析总结,认为EW向断裂构造为成岩成矿断裂,矿体与EW向展布的沿断裂充填的晚侏罗世次流纹岩时空、成因关系密切,矿体赋存于次火山岩侵入接触构造-硅化蚀变带(次生石英岩化带)中,矿体呈脉状、透镜状EW向分布。通过分析认为矿床成因为次火山热液矿床,与次火山有关的硅化带、次生石英岩化带是该区寻找相似成因矿床的找矿标志。     

基于MAPGIS的大洋多金属结核资源评价管理系统的开发及应用

通过对MAPGIS进行二次开发，针对大洋多金属结核矿产资源评价特点，研制开发了大洋多金属结核资源评价管理系统。该系统由工程管理、专题图件编辑、空间分析、查询分析、属性分析、数据模型等功能模块组成，实现了对大洋多金属结核空间数据进行管理、统计分析、成图显示、矿区圈定、资源量计算等功能，为大洋多金属结核资源评价提供了实用有效的手段。