...
  • 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 >A quaternary monogenetic volcanic field in the Xalapa region, eastern Trans-Mexican volcanic belt: Geology, distribution and morphology of the volcanic vents
【24h】

A quaternary monogenetic volcanic field in the Xalapa region, eastern Trans-Mexican volcanic belt: Geology, distribution and morphology of the volcanic vents

机译：跨墨西哥火山带东部哈拉帕地区的第四纪单系火山田：火山喷口的地质，分布和形态

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

The most abundant volcanic manifestations along the east-west trending Trans-Mexican Volcanic Belt (TMVB) are the scoria cones. These have been grouped by other authors in extended monogenetic volcanic fields such as Michoacan-Guanajuato, Chichinautzin, Apan and Los Tuxtlas. Here we present geological and morphological data of a relatively unknown group of monogenetic volcanoes located on the east flank of the Cofre de Perote volcano (CP), around the city of Xalapa in the state of Veracruz, Mexico. Within an area of about 2400 km~2, the "Xalapa Monogenetic Volcanic Field" (XMVF) contains over 50 late Quaternary volcanoes. Most of them are scoria cones, but small shield volcanoes and tuff rings also occur. The lava flows produced by these volcanoes are constrained by an abrupt topography and cover a great percentage of the surface on the eastern and northeastern flanks of CP, between 3000 and 500 m a.s.l. The representative rocks of the different volcanic centers include olivine basalt, basaltic andesite with phenocrysts of plagiodase, pyroxene and minor olivine, and andesite with phenocrysts of plagioclase and pyroxene. SiO_2 and Al_2O_3 contents of the rocks vary between 45 and 62 wt% and 15 to 18 wt%, respectively. Most of the basaltic rocks have MgO contents between 4.2 and 9 wt%, Ni and Cr concentrations between 23 and 180 and 10 to 380 ppm, respectively, with a typical calc-alkaline behavior. Trace elements suggest two types of magmas; the most abundant are characterized by an enrichment of LILE and LREE with negative anomalies of Nb and Ti, which denote a calc-alkaline affinity. Others are LILE depleted and show high concentrations of MgO, Cr, and Ni, which is typical of primary calc-alkaline magmas. The mean scoria cone morphological values are: cone height (Hco) = 90.8 m, cone diameter (Wco) = 686.38 m, crater diameter (Wcr) = 208.49 m and 0.12 km~3 for the cone volume. We dated twelve different scoria cones using the ~(40)Ar/~(39)Ar method; for the other cones we used morphologic indicators such as the ratio of the scoria cone height to basal diameter (Hco/Wco) and maximum slope angle. Additionally, vegetation type, and cone and lava flow morphologies were also considered in order to determine rough relative ages. In general, the ages fall into three groups, those older than 2.0 Ma, those between 0.25-0.40 Ma and those less than approximately 0.1 Ma.
机译：东西向的跨墨西哥火山带（TMVB）沿线最丰富的火山表现是火山岩锥。其他作者将它们归类于扩展的单基因火山场中，例如米却肯州-瓜纳华托州，奇奇亚努津，阿潘和洛斯图斯特拉斯。在这里，我们介绍了位于墨西哥韦拉克鲁斯州哈拉帕市附近，位于Cofre de Perote火山（CP）东翼的一个相对未知的单基因火山群的地质和形态数据。在大约2400 km〜2的面积内，“哈拉帕单生火山场”（XMVF）包含50多个晚期第四纪火山。它们中的大多数是渣ria锥，但也有小的盾形火山和凝灰岩环。这些火山产生的熔岩流受到陡峭地形的限制，并覆盖了CP东部和东北侧a.s.l. 3000至500 m之间的大部分表面。不同火山中心的代表性岩石包括橄榄石玄武岩，玄武质安山岩和斜长石，辉石和次要橄榄石，以及安山岩和斜长石和辉石。岩石的SiO_2和Al_2O_3含量分别在45至62 wt％和15至18 wt％之间变化。大多数玄武岩的MgO含量在4.2至9 wt％之间，Ni和Cr的浓度分别在23至180和10至380 ppm之间，具有典型的钙碱性行为。微量元素表明岩浆有两种类型。最丰富的特征是LILE和LREE富集，且Nb和Ti呈负异常，表示钙碱性亲和力。其他的LILE耗尽，并显示出高浓度的MgO，Cr和Ni，这是初级钙碱性岩浆的典型特征。炉渣锥的平均形态值是：锥高（Hco）= 90.8 m，锥直径（Wco）= 686.38 m，弹坑直径（Wcr）= 208.49 m，锥体积为0.12 km〜3。我们使用〜（40）Ar /〜（39）Ar方法对十二个不同的球菌锥体进行了测年。对于其他锥体，我们使用形态指标，例如，渣锥体高度与底径之比（Hco / Wco）和最大倾斜角。此外，为了确定粗略的相对年龄，还考虑了植被类型，锥状和熔岩流形态。一般而言，年龄分为三类：年龄大于2.0 Ma，年龄介于0.25-0.40 Ma和小于约0.1 Ma。

著录项

  • 来源
    《Journal of Volcanology and Geothermal Research》 |2010年第4期|p.149-166|共18页
  • 作者

    S.R. Rodriguez; W. Morales-Barrera; P. Layer; E. Gonzalez-Mercado;

  • 作者单位

    Departamento de Ceologia Regional, Institute de Geologia, Universidad National Autonoma de Mixico, Av. Universidad 3000, Coyoacan 04510, D.F., Mexico,Centro de Ciencias de la Tierra, Universidad Veracruzana, Francisco J. Moreno 207, Col. Zapata, 91090, Xalapa, Veracruz, Mexico;

    Centro de Ciencias de la Tierra, Universidad Veracruzana, Francisco J. Moreno 207, Col. Zapata, 91090, Xalapa, Veracruz, Mexico;

    Geophysical Institute, University of Alaska, Fairbanks, 903 Koyukuk Drive, Fairbanks AK, 99775, USA;

    PEMEX, Exploration, Urano 420, Modulo E. Ylang Ylang, Boca del Rio, 94299, Veracruz, Mexico;

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

    monogenetic volcanic field; basaltic volcanoes; trans-mexican volcanic belt; scoria cones;

    机译：单基因火山场玄武岩火山跨墨西哥火山带;锥体;

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