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|Appears in Collections:||Biological and Environmental Sciences Journal Articles|
|Peer Review Status:||Refereed|
|Title:||Extending the late holocene tephrochronology of the central Kenai Peninsula, Alaska|
Blackford, Jeffrey J
electron probe microanalysis
|Citation:||Payne R & Blackford JJ (2008) Extending the late holocene tephrochronology of the central Kenai Peninsula, Alaska. Arctic, 61 (3), pp. 243-254. http://www.jstor.org/stable/40513024|
|Abstract:||Tephrochronology, the reconstruction of past volcanic ash deposition, provides a valuable method for dating sediments and determining long-term volcanic history. Tephra layers are highly numerous in Alaska, but knowledge of their occurrence and distribution is incomplete. This study expands the regional tephrochronology for the Kenai Peninsula of southcentral Alaska by investigating the tephrostratigraphy of two peatland sites. We located seven visible tephras and seven microtephras and investigated the particle size and geochemistry of the visible tephras. Radiocarbon dates were used to estimate the timescale of each core. Geochemical comparison showed that the visible tephras originated from late Holocene eruptions of Augustine, Crater Peak-Mt. Spurr, and Hayes volcanoes. Some of the tephras had been documented previously, and these new findings expand their known range. Others represent eruptions not previously reported, including a Crater Peak-Mt. Spurr eruption around 430 cal. BP. The results provide new tephra data for the region, illustrate the spatial heterogeneity of tephra deposition, and show the potential of microtephras for expanding the regional tephra record.|
|Rights:||Publisher policy allows this work to be made available in this repository. Published in Arctic, Vol. 61, No. 3 (Sep., 2008), pp. 243-254 by Arctic Institute of North America. The original publication is available at: http://www.jstor.org/stable/40513024|
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