The tephra stratigraphy of two lakes in south-central British Columbia, Canada and its implications for mid-late Holocene volcanic activity at Glacier Peak and Mount St. Helens, Washington, USA
The tephra stratigraphy of two lakes in south-central British Columbia, Canada and its implications for mid-late Holocene volcanic activity at Glacier Peak and Mount St. Helens, Washington, USA
复制标题
加拿大不列颠哥伦比亚省中南部两个湖泊的火山灰地层及其对美国华盛顿州冰川峰和圣海伦斯山全新世中晚期火山活动的影响
DOI：
10.1139/e04-081
复制
发表时间：
2004
影响因子：
1.4
通讯作者：
F. Hu
中科院分区：
文献类型：
--
作者：
F. Foit;D. Gavin;F. Hu
在不列颠哥伦比亚省东南部的库利湖和岩滑湖的岩芯中发现了几个中晚全新世冰川峰火山岩沿着马扎马和圣海伦斯山的Wn和P火山岩。库利湖的沉积物中有全新世晚期冰川峰A火山灰（2010年校准（cal）年BP），四个独立的冰川峰Dusty Creek（GPDC）火山灰（5780 - 5830 cal年BP）和冰川峰组D火山灰（6060 cal年BP）。这是对不列颠哥伦比亚省A和D火山岩冰川峰的首次报道。A火山灰已相关的玻璃成分和年龄的基础上，晚全新世冰川峰火山灰的沉积物中的大双子湖，东北75公里的冰川峰。来自库利湖的四个GPDC火山灰层中的玻璃在成分上与不列颠哥伦比亚省西南部的巴尔环形山和冰冻湖中的玻璃没有区别。这些地层可能代表了50年来发生的四次喷发。虽然D组火山灰还没有被发现...
Several mid-late Holocene Glacier Peak tephras along with Mazama and Mount St. Helens Wn and P tephras were found in cores from Cooley and Rockslide lakes in southeastern British Columbia, ∼300 km northeast of Glacier Peak. The sediments in Cooley Lake host the late Holocene Glacier Peak A tephra (2010 calibrated (cal) years BP), four separate Glacier Peak Dusty Creek (GPDC) tephras (57805830 cal years BP), and a Glacier Peak set D tephra (6060 cal years BP). This is the first report of Glacier Peak A and D tephras in British Columbia. The A tephra has been correlated on the basis of glass composition and age to a late Holocene Glacier Peak tephra in the sediments of Big Twin Lake, 75 km northeast of Glacier Peak. The glasses in the four GPDC tephra layers from Cooley Lake are compositionally indistinguishable from those in Mount Barr Cirque and Frozen lakes in southwestern British Columbia. The layers likely represent four eruptions taking place over 50 years. Although set D tephra has not been correlat...