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Late Pleistocene Eruptive History of Nevado de Toluca Volcano, Central Mexico

机译:墨西哥中部内瓦多-德托卢卡火山的晚更新世爆发历史

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摘要

Fieldwork and radiocarbon dating provide evidence of two major explosive eruptions and an intervening minor eruption. The Nevado, a central stratovolcano built up in late Pleistocene time, was eviscerated by a violent Vulcanian-type eruption about 25,000 yr B.P., which deposited thick, cold, lithic lahars around its flanks. After a period of widespread soil formation, dated at 24,500 yr B.P., a relatively minor Vesuvian-type eruption produced small amounts of pumice that fell only on the eastern and northeastern slopes of the volcano. A major Plinian-type eruption took place at 11,600 yr B.P., directed mainly east-northeast, which spread thick dacitic pumice over an area of at least 1,700 km2. This eruption probably produced the "tripartite" pumice, which forms a marker for the stratigraphy of early man in the adjoining Valley of Mexico. The vent orifice was subsequently plugged by a dome of vesicular dacite. Key Words: stratigraphy • Quaternary • volcanology
机译:实地调查和放射性碳测年提供了两次主要的 爆炸性喷发和中间轻微喷发的证据。内华达州,一个 是一个在更新世晚期建立的中央平流火山, 因大约25,000 yr BP的强烈伏尔加斯型喷发而消失。它的 侧面有厚厚的冷石质拉哈尔。在一段广泛的土壤形成过程中,日期为 24,500 BP,相对较小的维苏威火山喷发产生了 少量的浮石,仅落在东部和东北部 火山的斜坡。在11,600年BP发生了一次主要的Plinian型喷发 ,主要指向东北-东北,其在至少1,700 km 2的区域上散布了厚厚的胶质浮石。 。这种 喷发可能产生了“三方”浮石,该浮石形成了墨西哥毗邻的 谷中早期人类地层的标志。通气孔随后被水泡状dacite圆顶堵塞。 关键词:地层学•第四纪•火山学

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  • 来源
    《GSA Bulletin》 |1974年第6期|901-906|共6页
  • 作者

    K. BLOOMFIELD; S. VALASTRO JR;

  • 作者单位

    Institute of Geological Sciences, Overseas Division, 5 Princes Gate, London SW7 1QN, England;

    Radiocarbon Laboratory, Balcones Research Center, University of Texas at Austin, Austin, Texas 78757;

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  • 正文语种 eng
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