...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Post-caldera volcanism: in situ measurement of U-Pb age and oxygen isotope ratio in Pleistocene zircons from Yellowstone caldera
【24h】

Post-caldera volcanism: in situ measurement of U-Pb age and oxygen isotope ratio in Pleistocene zircons from Yellowstone caldera

机译：火山口后火山作用：黄石火山口中更新世锆石中U-Pb年龄和氧同位素比的原位测量

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 Yellowstone Plateau volcanic field, the site of some of the largest known silicic volcanic eruptions, is the present location of NE-migrating hotspot volcanic activity. Most volcanic rocks in the Yellowstone caldera (0.6 Ma), which formed in response to the climactic eruption of 1000 km~3 of Lava Creek Tuff (LCT), have unusually low oxygen isotope ratios. Ion microprobe analysis of both U-Pb age and δ~(18)O in zircons from these low-δ~(18)O lavas reveals evidence of complex inheritance and remelting. A majority of analyzed zircons from low-δ~(18)O lavas erupted inside the Yellowstone caldera have cores that range in age from 2.4 to 0.7 Ma, significantly older than their eruption ages (0.5-0.4 Ma). These ages and the high-δ~(18)O cores indicate that these lavas are largely derived from nearly total remelting of normal-δ~(18)O Huckleberry Ridge Tuff (HRT) and other pre-LCT volcanic rocks. A post-HRT low-δ~(18)O lava shows similar inheritance of HRT-age zircons. The recycling of volcanic rocks by shallow remelting can change the water content and eruptive potential of magma. This newly proposed mechanism of intracaldera volcanism is best studied by combining in situ analysis of oxygen and U-Pb isotope ratios of individual crystals.
机译：黄石高原火山场是一些已知的最大的硅质火山爆发的地点，是东北向热点火山活动的所在地。黄石破火山口（0.6 Ma）中的大多数火山岩是响应于1000 km〜3的Lava Creek Tuff（LCT）的高空喷发而形成的，其氧同位素比非常低。对这些低δ〜（18）O熔岩中锆石中U-Pb年龄和δ〜（18）O的离子微探针分析揭示了复杂的遗传和重熔证据。在黄石破火山口内喷出的低δ〜（18）O熔岩中的大多数锆石，其核年龄范围为2.4至0.7 Ma，明显比其喷发年龄（0.5-0.4 Ma）大。这些年龄和高δ〜（18）O岩心表明这些熔岩主要来自正常δ〜（18）O哈克贝利里奇凝灰岩（HRT）和其他LCT之前的火山岩的近乎完全重熔。 HRT后的低δ〜（18）O熔岩显示出类似的HRT年龄锆石遗传。通过浅层重熔来回收火山岩可以改变岩浆的含水量和喷发潜力。通过结合对氧气和单个晶体的U-Pb同位素比值的原位分析，可以最好地研究这种新提出的火山口内火山形成机理。

著录项

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