共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
悦洋银多金属矿与紫金山特大型铜金矿仅一江之隔,二者具有相似的成矿环境。矿体均贮存于燕山早期花岗岩中;通过高精度LA-MC-ICP-MS锆石年龄测定获得中细粒花岗岩年龄为(152.4±1.4)Ma,细粒花岗岩年龄为(145.3±1.5)Ma,与成矿密切关系的次流纹斑岩年龄为(100.6±1.5)Ma;根据何屋多个钻孔出现岩层重复且似层间断裂发育,首次提出区内存在推(滑)覆构造,其中滑覆断裂与成矿紧密相关;综合研究认为区内北东向宣和复式背斜的轴向断裂和北西向上杭—云霄深断裂的次级断裂均十分发育,这2组基底断裂交会处控制燕山晚期火山-次火山活动和含矿溶液运移的构造空间;低级别、低序次的北西向断裂带、裂隙密集带、层间破碎带等是矿体的定位空间,进而分析区域成矿规律及找矿方向。 相似文献
3.
塔斯特北西西向金成矿断裂的构造地球化学特征 总被引:4,自引:0,他引:4
本文着重探讨了成矿断裂带中成矿元素和稀土元素的构造化学行为,初步揭示了塔斯特北西西向成矿断裂带内金等成矿元素的变化特点,阐明构造及其相关的蚀变作用对构造蚀变岩和金矿体的形成起决定性作用,金成矿部位是经历了多构造成矿作用的地段的研究结果。 相似文献
4.
5.
661铀矿床矿石U-Pb等时线年龄及其成矿构造背景 总被引:4,自引:1,他引:3
661铀矿床位于赣杭构造火山岩铀成矿带东段大洲铀矿田内,矿体赋存于磨石山群九里坪组流纹岩之中,矿床定位于岩石圈伸展断陷盆地附近,明显受断裂带的控制.利用矿石U-Pb等时线法确定了该矿床两个矿体的成矿时代,分别为(107.0±2.3)Ma和(110.0±3.5)Ma.这些年龄值与断陷红盆底部发育的玄武岩的成岩年龄一致,也与东南沿海地区明显存在的110 Ma基性脉岩拉张活动的时间一致,表明岩石圈伸展与铀成矿之间具有良好的对应关系,为岩石圈伸展期与铀成矿关系研究提供了年代学证据.岩石圈伸展控制着富CO2热液形成的时间,因而也大致控制了铀成矿的时代. 相似文献
6.
7.
铅山铅锌矿位于清流—安溪北西向断裂带与平潭—漳平东西向断裂带的复合部,闽中多金属矿化集中区南端的洛阳—剑斗东西向多金属成矿带中段,矿体贮存于北东向断裂破碎带中,为岩浆期后中低温热液矿床,控矿的北东向断裂带是多期次构造活动的产物,主成矿期为燕山早期,铅山周围尚有较大的找矿远景。 相似文献
8.
9.
黄沙坪铜锡多金属矿床是在钦杭成矿带和南岭成矿带叠合构造背景下形成的岩浆热液型多金属成矿系统的典型代表,该区铜多金属矿与锡多金属矿成矿系统复合、多期构造体系联合、深部钨锡矿与浅部铅锌银矿耦合等特点突出。针对该矿床控矿构造深部展布格局不清、深部铜锡多金属矿体定位不明的核心问题,基于矿田(床)构造精细解析,开展了多期构造体系控岩控矿作用机理及其控矿构造深延格局的深入研究,表明岩浆侵入接触构造系统与倒转背斜翼部的层间断裂-裂隙系统分别控制了脉状-不规则SK型铜钨锡多金属矿体群与沿NNE-NE向层间断裂带、NW向断裂带分布的热液脉型铅锌银(金)矿体群,这些矿体群具有不同的侧伏规律;基于矿田、矿床、矿体(脉)尺度控岩控矿构造组合样式的剖析,揭示了构造分级控岩控矿规律和中心对称成矿效应,厘清了成矿前、成矿期和成矿后构造体系,构建了矿田构造控岩控矿模式,进一步论证了坪宝矿田成矿构造动力学背景:中生代以来,坪宝矿田构造应力作用呈现“顺时针式”的运动方式,在燕山早期太平洋板块与华夏板块发生碰撞造山作用,在区内产生SEE-EW向主压应力作用,从而在矿田内形成了中酸性岩浆侵入成岩成矿系统。这些认识为坪宝矿田乃至钦杭、南岭成矿带湘南地区深部找矿勘查提供了重要启示。 相似文献
10.
浏阳市井冲钴铜多金属矿床地质特征及成因浅析 总被引:2,自引:0,他引:2
浏阳井冲钴铜多金属矿床位于钦杭断裂带西段湘东北铜金成矿带之长平断裂带中部。矿区勘查工作时间跨度达50年,2008年工作程度达到详查,探求钴铜资源量达中型矿床规模。钴铜多金属矿成矿与长平断裂带和燕山期连云山花岗岩、花岗闪长斑岩有关。矿体产于长平断裂带次级构造热液蚀变岩带中,中泥盆统碎屑岩和灰岩透镜体对成矿有利。矿体沿构造热液蚀变岩带向SW向有明显侧伏趋势,矿化垂向分带明显,表现为深部钴铜矿,浅部铅锌矿。构造找矿标志、岩浆岩找矿标志、金属量铅异常找矿标志、磁异常找矿标志、原生晕异常找矿标志、围岩蚀变找矿标志和直接矿化找矿标志明显。综合成矿物质来源、成矿条件等研究资料,初步确定本矿床属于与花岗岩有关的中温热液裂隙充填交代型钴铜多金属矿床。 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
14.
15.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozach 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
16.
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
17.
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
18.
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
19.
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
20.
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