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1.
陕西勉、略、阳三角地带的钴矿简介 总被引：2，自引：0，他引：2
本文概述了勉、略、阳三角地带的地质背景、钴矿类型、成矿规律。作者认为,依据赋矿岩石和成矿作用可把该区钴矿类型划分为产于超基性岩中的硫化钴镍矿床,产于基性岩中的硫化钴镍矿,产于闪长岩侵入体与变细碧岩接触带附近的铜钴矿,产于矽卡岩型磁铁矿体上盘和板岩烈隙中的钴矿脉。其中以第一种类型最主要,有望发展成大型钴矿床。在文章最后,作者分析总结了成矿规律,建议并提出了理想钴矿找矿区。 相似文献
2.
钴镍矿床主要有四类：岩浆型、红土型、沉积岩-变沉积岩容矿型和热液型。本文提出“纽带矿床”的概念,是指兼具多种不同类型或不同成矿元素组合的矿床,是不同矿床类型之间连接以及与成矿理论连接的结合点,也是成矿模型与找矿模型之间的纽带。从金属共生关系的角度看,镍矿普遍伴生钴,但钴矿未必有镍;从元素地球化学的角度看,钴和镍在深部岩浆过程多共生,而在浅表热液、风化和沉积等过程多分离。据此提出钴镍成矿的关键科学问题为钴镍共生、分离和富集机理,主要包括：(1)岩浆-热液过程中的钴镍分离与富集机理;(2)风化-沉积过程中的钴镍共生-分离-富集机理。通过对四种类型典型矿床和纽带矿床的解剖,结合实验岩石学及数值模拟计算与钴镍赋存状态及富集规律的研究,有助于建立完整的钴镍成矿理论体系。同时,从更大尺度上来看,钴镍成矿和重大地质事件具有一定的耦合关系,镁铁-超镁铁岩体的成矿差异与构造背景息息相关,而热液改造在钴超常富集方面可能起到至关重要的作用。钴镍矿床赋矿地质体产状复杂多变,含矿岩体与围岩之间物性相似,钴-镍赋存状态多样,迫切要求解决钴镍矿床勘查的关键技术问题为多元多尺度勘查技术体系与含矿性评价,主要包括：(1... 相似文献
3.
祁漫塔格位于青海省东昆仑成矿带西段,区内有色金属、贵金属和非金属矿产资源丰富,矿床类型多样,成矿时代多期,成矿作用复杂,亟需对本区各类矿产进行区域成矿规律总结,厘定成矿系列,建立成矿模式,指导区域找矿再创新突破.为此,本次研究以成矿系列思想为指导,通过系统分析典型矿床特征,将祁漫塔格地区主要矿产划分为4个成矿系列,即中古代沉积变质型铁-石墨矿成矿系列、奥陶纪喷流沉积型钴-金-铋矿成矿系列、晚志留世-中泥盆世岩浆熔离型镍-铜-钴矿成矿系列、三叠纪斑岩型-矽卡岩型-隐爆角砾岩型-热液型铁-多金属-贵金属成矿系列,并建立了4个系列典型矿床成矿模式;揭示了重大构造事件与成矿的关系,深化了中元古代活动大陆边缘、早古生代大陆裂解、早古生代晚期大陆碰撞-伸展、三叠纪碰撞-伸展等构造体制的成矿规律认识,探讨了三叠纪集中成矿的深部过程. 相似文献
4.
《西北地质》2015,(4)
冰沟南地区位于青海省东昆仑造山带西段祁漫塔格成矿带,成矿地质条件优越,但受自然条件的制约。冰沟南矿床发现较晚,且工作程度较低,找矿类型和找矿前景不明朗。通过分析矿床的地质特征、成矿规律及物化探资料,结合近期铜镍找矿新发现,将冰沟南地区的成矿类型划分为5种类型:矽卡岩型、热液型、斑岩型、岩浆熔离型及沉积变质型。矽卡岩型热液型斑岩型铜-铅-锌-钼矿和岩浆熔离型镍-铜-钴矿为最主要的2个成矿系列,前者与晚三叠世花岗岩作用密切相关,后者与后碰撞阶段伸展构造背景下慢源岩浆活动密切相关。利用"协优成矿预测"理论,对冰沟南地区找矿前景进行了分析,认为Ⅲ矿带北部具有寻找热液型铅-铜-钴矿找矿潜力,冰沟南矿区中北部具有寻找岩浆熔离型镍-铜-钴矿的良好前景。 相似文献
5.
中国镍矿成矿规律初探 总被引：12，自引：0，他引：12
我国镍矿可分为岩浆型、海相沉积型和风化壳型3种预测类型.矿床形成时代较为连续,最早形成于中—新元古代,最晚形成于新生代,其中中—新元古代和晚古生代是形成矿床的两个高峰期;中—新元古代矿床主要分布在华北地块和扬子地块周缘,晚古生代镍矿主要分布在中亚造山带、峨眉山和塔里木大火成岩省范围内.岩浆型镍矿主要形成于大陆边缘裂解、造山带后碰撞伸展以及地幔柱3种构造背景,根据不同构造背景并结合主要岩浆作用特点,将与幔源基性—超基性岩有关的镍-铜-钴-铂族元素矿床成矿系列类型划分出与大陆裂解边缘幔源基性—超基性岩浆作用有关的镍-铜-钴-铂族元素矿床成矿亚类型、与地幔柱基性—超基性岩浆作用有关的镍-铜-钴-铂族元素矿床成矿亚类型、与造山带俯冲作用下幔源基性—超基性岩有关的镍-铜-钴-铂族元素矿床成矿亚类型、与造山带后碰撞伸展背景下幔源基性—超基性岩有关的镍-铜-钴-铂族元素矿床成矿亚类型等4种亚类型.分别对中—新元古代与大陆边缘裂解有关的镍铜(铂)矿床、寒武纪与黑色页岩有关的海相沉积型镍钼钒矿床、早二叠世与造山带伸展背景有关的镍铜矿床、晚二叠世与大火成岩省有关的镍铜(铂)矿床、新生代与风化壳有关的镍金矿床及其对应的典型矿床特征和成矿模式进行了叙述;认为大陆裂解边缘、地幔柱、造山带后碰撞伸展是我国镍矿形成的有利成矿地质背景,与邻近深大断裂、镁铁—超镁铁岩体、高MgO的原生岩浆(高镁玄武质岩浆)、深部岩浆作用、硫饱和与硫化物熔离共同组成岩浆型镍矿的6个重要地质条件. 相似文献
6.
我国是镍矿资源消费大国,同时又是镍矿资源相对匮乏的国家。为了科学地评估我国镍矿资源潜力,指导找矿勘查工作,进而提高我国镍矿资源的自我保障能力,国土资源部在2006-2013年部署了包括镍矿在内的25个矿种的全国矿产资源潜力评价项目。该项目以矿产预测类型为主线,通过分析我国镍矿的矿床地质特征和时空分布规律,对代表预测要素的地质、物探、化探和遥感信息进行综合,最终形成预测模型,并在此基础上采用相似类比的思想圈定预测区,估算资源量。结果表明：（1）我国镍矿包括岩浆型、风化壳型和沉积型3种矿产预测类型,其中以岩浆型镍矿占绝对主导地位,其查明资源储量约占全国镍矿资源总量的93%;（2）我国共划分了30个成镍带,其中重点成镍带13个,大部分集中在西部地区;（3）不同预测类型对应的预测模型,其主要预测要素存在明显差异,岩浆型镍矿最重要的预测要素是基性超基性岩体,风化壳型镍矿最重要的预测要素是超基性岩顶部形成的风化壳,沉积型镍矿最重要的预测要素是寒武系下统黑色岩系;（4）全国圈定了524个镍矿最小预测区,在此基础上,全国共圈定98个镍矿3级预测区,在3级预测区中,大于10万t的镍矿预测区共有35个;（5）镍矿累计查明镍资源储量共计1 345万t,预测镍资源量共计2 820万t。 相似文献
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华北地区铅锌矿资源丰富、类型多样,是我国铅锌矿床的重要产区。本文在总结资源禀赋、矿床类型、时空特征、主要控矿因素、资源潜力等要素基础上,较全面分析了华北地区铅锌矿的主要特征和成矿规律。研究表明,从矿床成因角度,华北地区铅锌矿可划分为岩浆热液型、碳酸盐岩—细碎屑岩型、陆相火山岩型、矽卡岩型、斑岩型、碳酸盐型等6种类型,并可划归"层控"型和"岩控"型两大类;从矿产预测角度,又可划分为26个矿产预测类型,其中以碳酸盐岩—细碎屑岩型、岩浆热液型铅锌矿最为重要。基于华北地区铅锌成矿演化规律,华北地区铅锌成矿期可划分为中元古代、早古生代、晚古生代和中生代4个主要时期,中元古代、中生代是铅锌成矿的高峰期。华北地区铅锌成矿受控于区域构造、沉积-火山岩系、中酸性侵入岩等多种因素,经历了长期且复杂的构造演化,"层控"型和"岩控"型矿床的成矿环境各有不同,成矿作用特征具有明显差异。经综合评价,华北地区的铅锌成矿可划分为34个铅锌找矿远景区,显示出良好的找矿资源潜力。 相似文献
8.
福建省主要矿产的成矿特征与分布规律 总被引：2，自引：0，他引：2
本文根据省内近年来矿产勘查、成矿区划（预测）和专题科研的成果，综合论述了全省多种主要矿产的矿床类型与成矿特征，分析和总结了这些矿产的时空分布基本规律，同时对大多数矿床集中分布区－－矿结的类型进行了划分，总结出五种不同类型矿结的控矿特征。并提出今后地质找矿工作的重点区域应为三个Ⅲ级成矿区和十一个Ⅳ级成矿带。 相似文献
9.
陕西横跨三大地质构造单元,曾历经前板块构造、板块构造和陆内造山等三大构造-成矿演化阶段、8个构造-成矿期和8次重大成矿地质事件,形成能源、金属、非金属和水气等四大类135种矿产2000余处矿产地。本文在建立涵盖陕西固体及非固体矿产矿床类型划分方案的基础上,总结了矿产时、空分布规律:时间上具有明显的阶段性,由早到晚分出8个构造-成矿期;空间上具有明显的丛聚性,由北到南划出12个矿集区。矿集区与地质历史时期的重大成矿地质事件密切相关,根据二者的时空关系,划分出单一型、耦合型、叠加型和复合型4种类型矿集区。矿集区的矿产种类、规模大小,一般与其所发生的成矿地质事件的性质和频次有关。叠加型矿集区比单一型矿集区更具找矿潜力。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
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. 相似文献
12.
Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
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. 相似文献
13.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
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. 相似文献
14.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
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). 相似文献
15.
正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
16.
正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
20.
正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献