• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Volcanology and Geothermal Research >Mt. Nemrut volcano (Eastern Turkey): Temporal petrological evolution
【24h】

Mt. Nemrut volcano (Eastern Turkey): Temporal petrological evolution

机译：公吨。内姆鲁特火山（东土耳其）：时间岩石学演变

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Quaternary active Nemrut volcano is situated 12 km north of the Bitlis-Zagros suture zone, southern margin of continental collision between Arabian and Anatolian plates. The latest activity of the volcano dates back to historic times. Volcanic evolution of the volcano is investigated under two main stages: Pre-caldera and post-caldera separated by paroxysmal caldera forming eruptions not older than 90 ka. The majority of the products are silica oversaturated peralkaline {([Na_2O + K_2O]/Al_2O_3)>l} felsic rocks with rare transitional-to-mildly alkaline basalts and mugearites. A compositional gap (Daly Gap) between 53% and 59% SiO_2 is partly filled with benmor-eitic enclaves in peralkaline rhyolites. Benmoreitic enclaves display evidence of interminglement between mafic and felsic magmas. Observed mineral assemblages represent typical peralkaline mineralogy with aenigmatite, arfvedsonite-riebeckite, aegirine, fayalite and chevkinite. Geochemical evolution trends and modelling depict that protracted crystal fractionation dominated by feldspar, clinopyroxene, olivine and Fe-Ti oxides and crustal contamination would produce peralkaline rhyolites from the actual mafic compositions taken as parents. Miner-alogical and petrographical observations indicate that the magma chamber is zoned compositionally having a crystal rich density layer between mafic and felsic melts. The genesis of Nemrut peralkaline magmatism has been ascribed to the ascension of slightly subduction modified asthenospheric melts into upper crustal high level reservoirs in localized extension in Mu(s) ramp basin.
机译：第四系活跃的内姆鲁特火山位于比特利斯-扎格罗斯缝合带以北12公里处，这是阿拉伯板块与安那托利亚板块之间大陆碰撞的南缘。火山的最新活动可以追溯到历史时期。研究了火山的火山演化，主要分为两个阶段：破火山口前和破火山口后被阵发性破火山口隔开，形成不超过90 ka的爆发。大多数产品是二氧化硅过饱和的过碱性{（[Na_2O + K_2O] / Al_2O_3）> l}长英质岩石，具有稀有的过渡到中度碱性的玄武岩和玄武岩。 53％到59％SiO_2之间的组成间隙（Daly Gap）部分被高碱性流纹岩中的本色-飞地所填充。本莫里地飞地显示出镁铁质岩浆岩和长岩质岩浆之间相互融合的证据。观察到的矿物组合代表了典型的碱性碱性矿物学，其中有锂辉石，钠镁矾-里贝石，eg色氨酸，铁橄榄石和白云母。地球化学的演化趋势和建模结果表明，长石，斜辉石，橄榄石和Fe-Ti氧化物占主导的长期晶体分级分离和地壳污染将从实际的镁铁矿成分中生成碱性碱性流纹岩。矿物学和岩石学观察表明，岩浆室的组成区域在镁铁质和长素体熔体之间具有富含晶体的密度层。 Nemrut高碱性岩浆作用的成因是由于将Mu（s）斜坡盆地局部扩展的略微俯冲的软流圈融化作用提升到上地壳高位储层中。

著录项

  • 来源
    《Journal of Volcanology and Geothermal Research》 |2012年第1期|p.33-60|共28页
  • 作者

    H.E. Çubukçu; ì.Ulusoy; E. Aydar; . Ersoy; E. (S)en; A. Gourgaud; H. Guillou;

  • 作者单位

    Hacettepe University, Department of Geological Engineering, 06800, Beytepe-Ankara, Turkey;

    Hacettepe University, Department of Geological Engineering, 06800, Beytepe-Ankara, Turkey;

    Hacettepe University, Department of Geological Engineering, 06800, Beytepe-Ankara, Turkey;

    Hacettepe University, Department of Geological Engineering, 06800, Beytepe-Ankara, Turkey;

    Hacettepe University, Department of Geological Engineering, 06800, Beytepe-Ankara, Turkey;

    University Blaise Pascal, OPGC, Lab. Magmas et Volcans, UMR-6524 CNRS, 5 rue Kessler, 63038 Clermont Ferrand Cedex, France;

    Laboratoire des Sciences du Climat et de I'Environnement, Domaine du CNRS, Bat. 12, Avenue de la Terrasse, 91198 Cif-sur-Yvette, France;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号