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1.
锂因其在新能源领域的应用广泛性和不可替代性而备受关注。以往锂矿勘查主要集中于盐湖型和硬岩型锂矿,针对沉积型锂矿开展工作较少。本文聚焦于中国西南滇黔桂地区,以岩石和水系沉积物中锂的时空分布特征为基础,分析区域内沉积型锂矿成矿潜力。结果显示,中国西南滇黔桂地区水系沉积物锂含量平均值为46. 7×10-6,显著高于全国背景值32×10-6。以57. 0×10-6为异常下限,共圈定9个锂地球化学省,与已知的沉积型锂矿床分布具有良好的对应性。同时,锂异常浓集区与某些特定时代和岩性的地层分布密切相关。区内水系沉积物中锂元素含量受到岩石锂含量制约,以碳酸盐岩为主的构造单元水系沉积物中的锂显著次生富集,以陆源碎屑岩为主的构造单元内水系沉积物中锂富集程度较弱。综合分析认为,西南滇黔桂地区锂异常带的形成受区域岩石类型、次生富集作用和气候条件等多重因素制约。该研究对了解西南滇黔桂地区锂元素次生聚集就位机制和指导沉积型锂资源的找矿勘查具有重要的参考意义。 相似文献
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本文利用中国不同尺度水系沉积物地球化学填图数据, 以10 km×10 km的网格为基础, 按1:100万比例尺进行了数据计算。地球化学数据统计显示, 以秦岭—大别山为界, 中国南北地区铀含量值存在明显差异。以铀含量中位数(累计频率50%)作为背景值, 全国背景值为2.3×10–6、南方为2.9×10–6、北方为2.1×10–6。考虑南北地区铀表生风化和富集或贫化程度差异, 以累计频率85%作为异常下限, 对应南方地区含量值4.8×10–6、北方地区含量值3.0×10–6做为地球化学异常下限, 共圈出面积大于1000 km2, 且具有明显异常浓集中心的地球化学块体共79处。在结合前人研究成果的基础上, 对铀地球化学块体及异常特征、矿床分布、地质特征进行研究, 最终圈定出铀矿找矿远景区33处, 并以四个主要铀矿床类型分别对33个远景区进行了适当的讨论。 相似文献
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锂同位素及其在四川甲基卡伟晶岩型锂多金属矿床研究中的应用 总被引：3，自引：0，他引：3
锂同位素在地质学、地球化学研究中有着广阔的应用前景。简单介绍了锂同位素研究已取得的进展,并在四川甲基卡伟晶岩型锂多金属矿床研究中开展应用。研究表明,四川甲基卡锂矿床中2件锂辉石的锂含量非常高,分别为33 592×10-6和34 264×10-6,相应的δ7Li值分别为-0.6‰和-0.4‰,平均值为-0.5‰,而二云母花岗岩中黑云母的锂含量为7 350×10-6,δ7Li值为+0.6‰,两者在误差范围内具有非常好的一致性,证明锂辉石来源于二云母花岗岩,这与其他包裹体、同位素地球化学和年代学证据等相一致。 相似文献
4.
经对1：20万区域化探异常AS59进行1：1万土壤加密测量,圈定出3条北西走向的Li异常带,并进一步划分为7处子异常.异常强度较强,峰值最高1651.1×10-6,规模较大,Li异常浓集中心明显,均具有内、中、外带分布特征.表层与深部样品中Li含量比较均匀,各类方法采集的样品中Li含量基本一致.引起Li异常的是3条赋存在晚侏罗世钠长石化流纹斑岩内的锂稀有金属矿化蚀变带,地表刻槽取样分析Li 0.08×10-2~0.136×10-2.结合深部地球化学研究及地质背景,认为该区锂矿找矿有望取得重大突破. 相似文献
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老挝是东南亚地区多金属矿产的重要产地, 本文首次依据老挝全境1:100万地球化学填图数据, 初步研究了老挝铜地球化学地球化学背景和空间分布特征, 圈定了老挝地球化学异常, 主要取得了如下结论: 1)老挝水系沉积物铜含量分布范围在1.20×10–6～459.00×10–6, 平均值21.96×10–6, 背景值16.50×10–6, 不同构造单元中铜含量而言, 长山地块和各类缝合带上的铜元素平均值和中位值显著大于其他构造单元; 2)老挝铜的地球化学图显示, 其铜元素分布不均, 总体上表现为北部较高, 南部较低的格局; 3)用含量累计频率85%(33.1×10–6)为异常下限, 全老挝境内圈定铜元素地球化学异常13处, 其中4处达地球化学省规模(>1000 km2), 为老挝铜矿成矿远景区划分和勘查提供了基础性资料。 相似文献
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为了查明盘州地区绿豆岩中锂多金属富集情况,本次工作在盘州地区中三叠统关岭组底部地层中共采集21件绿豆岩样品。分析测试结果显示,Li的含量介于5767×10-664137×10-6之间(平均33243×10-6),最高含量相当于014%的Li2O含量;轻稀土元素(LREE)含量介于9597×10-651612×10-6之间(平均25778×10-6),最高含量相当于006%的REE2O3含量,高于风化壳离子吸附型稀土矿床轻稀土最低工业品位005%0098%。通过对盘州地区绿豆岩进行系统的微量元素和稀土元素地球化学分析表明:绿豆岩大部分微量元素含量与上陆壳元素丰度几乎相符,相对富集Li、Y、Cs、Rb等稀有元素,亏损Tl、Ba、Sr、Cd、In等分散元素和过渡元素Ni;稀土元素总量(∑REE)介于10837×10-658976×10-6之间,平均值为29570×10-6,稀土元素配分模式图显示轻稀土富集的右倾型分布特征,具有较明显的负Eu异常;(La/Yb)CN、(La/Sm)CN和(Gd/Yb)CN显示,轻重稀土之间分馏明显、轻稀土分馏中等、重稀土分馏程度不明显;由稀土元素Eu异常和La/Yb-ΣREE图解可知,绿豆岩母岩来源于沉积岩、花岗岩和碱性玄武岩—大陆拉斑玄武岩的混合,其中沉积岩组分来源于北侧的泸州隆起区,母岩中的花岗岩和碱性玄武岩—大陆拉斑玄武岩组分则与火山喷发有关;绿豆岩铈异常(Ceanom)、Sr/Ba和Rb/Sr说明,盘州地区绿豆岩总体形成于气候温暖潮湿的半局限台地,处于淡水—半咸水沉积环境,水体呈弱还原—氧化状态。 相似文献
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中蒙边界地区成矿地质条件优越,资源潜力巨大,是国际、国内地学研究和勘查的热点地区.锂能已被国际上公认为未来新能源的发展方向,锂矿成为关键性战略矿产资源调查和研究的热点.随着我国锂资源需求日益增加,了解其在土壤圈中的浓度和分布对缓解我国锂资源短缺问题至关重要. 依托中蒙边界1︰100万地球化学填图数据,探讨了汇水域沉积物中锂的地球化学参数、区域地球化学分布特征以及影响因素. 中蒙边界地区汇水域沉积物锂元素中位值和平均值分别是22.50×10-6和24.46×10-6;阿尔泰构造带、阿尔泰南缘弧盆系锂含量最高,区域浓集系数分别是1.38、1.26,是锂的富集优势区;锂的区域地球化学分布主要受地质背景、成土母岩控制,地理景观、黏土含量、矿床分布等也制约着锂的分布模式. 根据85%累积频率,圈定出74个锂地球化学异常区,其中23个锂地球化学异常达到地球化学省规模,根据锂地球化学异常分布模式为该区寻找锂等稀有金属矿床提供了重要选区. 研究填补了中蒙边界地区锂地球化学分布的空白,为两国边境地区锂等稀有金属矿床对比提供基础数据,为缓解中国锂资源短缺优选了勘查靶区. 相似文献
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内容提要:江南造山带是我国重要的稀有金属成矿带,已发现多处与锂相关的花岗伟晶岩型稀有金属矿床。锂等稀有金属元素在源区基底岩石中的富集是花岗伟晶岩型锂稀有金属矿床成矿的物质基础,但是江南造山带基底岩石中锂的分布及其富集机制仍不清楚。本文详细调查研究了江南造山带东段新元古代冷家溪群、双桥山群、溪口岩群和板溪群变质沉积岩和星子杂岩。这些基底变质岩的岩石类型包括变质砂岩、泥质板岩、千枚岩和云母片岩以及少量片麻岩。地球化学分析结果显示,冷家溪群、双桥山群和溪口岩群变质沉积岩具有相似的成分,变质砂岩和云母片岩-片麻岩整体上比泥质板岩和千枚岩具有较高的Si O2含量,较低的Ti O2、Al2O3、K2O、Mg O和TFe2O3含量。泥质板岩和千枚岩含有更高的稀有金属元素含量,其中锂含量达到61.8×10-6,而变质砂岩的锂丰度为44.9×10-6。板溪群具有最低的稀有金属元素含量(Li=30.8×10 相似文献
10.
在黔北上二叠统底部铁铝质黏土岩、下部煤层及其顶底板炭质黏土岩中发现其富集稀土、铌、锆和锂等关键金属元素,其中铁铝质黏土岩REY、Nb、Zr和Li平均含量分别为807×10- 6、143×10- 6、1107×10- 6、375×10- 6,下部煤层及其顶底板炭质黏土岩中REY、Nb、Zr和Li平均含量为分别为555×10-6、104×10-6、786×10-6、116×10-6。显示出该区域该层位具有关键金属矿床良好的找矿前景。 相似文献
11.
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
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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
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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.) 相似文献
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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, 相似文献
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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.) 相似文献
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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- 相似文献
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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 相似文献