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在系统分析木里煤田构造格局和构造控煤特征的基础上,将本区控煤构造样式划分为压缩、剪切、滑动3大类和8种类型。揭示了控煤构造样式与煤系赋存之间的关系,木里煤田控煤构造样式以压缩为主,分布广泛,部分矿区构造样式表现为剪切和层滑,各矿区煤系赋存状态受煤田构造格局的控制,具有南北分带、东西分段的特征。煤田边缘构造复杂,控煤构造样式以逆冲前锋型、逆冲断夹块型、逆冲-褶皱型和对冲型为主,含煤向斜形态多不完整;煤田中部地质构造相对简单,控煤构造样式以褶皱-断裂型为特征,含煤岩系赋存稳定,是有利的勘查开发区段。 相似文献
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青海东北部木里煤田控煤构造样式与找煤预测 总被引:4,自引:0,他引:4
在系统分析木里煤田构造格局和构造控煤特征的基础上,将本区控煤构造样式划分为压缩、剪切、滑动3大类和8种类型。揭示了控煤构造样式与煤系赋存之间的关系,木里煤田控煤构造样式以压缩为主,分布广泛,部分矿区构造样式表现为剪切和层滑,各矿区煤系赋存状态受煤田构造格局的控制,具有南北分带、东西分段的特征。煤田边缘构造复杂,控煤构造样式以逆冲前锋型、逆冲断夹块型、逆冲-褶皱型和对冲型为主,含煤向斜形态多不完整;煤田中部地质构造相对简单,控煤构造样式以褶皱-断裂型为特征,含煤岩系赋存稳定,是有利的勘查开发区段。 相似文献
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龙永煤田暴露区找煤基本勘查完毕,隐伏区找煤成为今后工作的主攻方向。根据区内地层及构造特征,结合找煤实例分析,认为:①区内地表出露翠屏山组中下部地层的区块以及三叠系下统溪口组与翠屏山组中下部直接接触的区块,由于层间滑脱断层缺失上部地层,使煤系地层埋藏变浅,是找煤的有利范围;②层间逆冲推覆构造主要分布在煤田东部,造成童子岩组的地层重复,由于上盘构造复杂,含煤性变差失去勘查价值,下盘煤系地层保存完整,煤炭资源量可观,其下盘可作为找煤的主要方向;③煤田东部红林坪-白沙-茶林盂一带出露白垩系沙县组(即红层).如“红层”与下伏地层为小角度不整合接触,则其“红层”与下伏的童子岩组及翠屏山组接触地带为找煤的有利区块;④区内“火山岩”主要分布在东北部,因厚度大,煤系地层埋藏深,找煤难度较大;⑤基底逆冲推覆构造在区内发育规模较小.煤田内出露的“老地层”基本上为基底隆起.其下找煤的可能性较小。 相似文献
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新疆早-中侏罗世同沉积(期)构造活动自始至终与聚煤作用相伴,并直接影响含煤地层发育程度和煤层的原生厚度及结构。该期同沉积构造活动受特提斯-喜马拉雅地球动力学体系控制,其主要活动方式表现为同沉积逆冲断层和同沉积正断层,从而造成聚煤盆地基底沉降速度与幅度的明显差异。在其控制下,聚煤盆地的沉积中心和赋煤中心有自西向东、由南向北迁移的趋势;从含煤区尺度进行比较,聚煤强度与盆地基底总体沉降幅度呈负相关关系;从含煤盆地或煤田尺度进行比较,聚煤强度与盆地基底沉降速度之间的关系分别表现为正相关型、抛物线型及负相关型。 相似文献
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新疆尼勒克盆地煤变质成因浅析 总被引:1,自引:0,他引:1
1 地质概况 尼勒克盆地属于伊犁煤田中的一个山间断陷盆地,大地构造位置处于天山纬向构造带西段。盆地南北两侧为晚古生代地层形成的高山,盆地内沉积中、新生代地层,受盆缘断裂控制,盆地呈近东西向~北西西向展布。东西长约130km,南北宽5~12km,面积约1800km~2。受天山构造带影响,盆地内断裂、褶皱均呈东西向。煤系地层被断裂切割成一系列断块,断层性质以压性、压扭性逆断层、平推断层为主,显示燕山运动曾经历强烈挤压和抬升(图1)。 相似文献
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《中国煤炭地质》2016,(4)
逆冲断层是以挤压性应力为主的构造复杂区常见的构造类型,含煤地层受逆冲断层影响,常隐伏在老地层之下,逆冲推覆构造的组合型式、分布规律和几何形态研究成果,能够在煤炭资源勘查中发挥较好的指导作用。青海省中祁连地区木里煤田是我国西北重要的焦煤生产基地,其构造应力场演化大致可分为3个阶段,其中第Ⅲ阶段NNE—SSW向的挤压对该地区控煤构造起到主要作用,形成了一系列NNW—SSE向展布的含煤向斜褶皱,同时形成了大量逆冲推覆构造。以木里煤田的聚乎更矿区和江仓矿区为研究对象,应用推覆构造下找煤理论,经过钻探验证,在逆冲推覆断层的下盘发现了侏罗系含煤地层及煤层,证实了逆冲推覆找煤理论对寻找新的煤炭资源具有重要指导意义。 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
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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 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
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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
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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
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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
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正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献