气候变化领域集成服务门户(CCPortal): Glacial chronology and slip rate on the west Klamath Lake fault zone, Oregon

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DOI	10.1130/B31961.1
	Glacial chronology and slip rate on the west Klamath Lake fault zone, Oregon
	Speth G.T.; Amos C.B.; Amidon W.H.; Balco G.; Meigs A.J.; Graf S.
发表日期	2018
ISSN	167606
起始页码	444
结束页码	460
卷号	131 期号:2021-03-04
英文摘要	New geomorphic mapping and cosmogenic 3He geochronology on the west Klamath Lake fault zone in southern Oregon, USA, constrain the age of glacial and post-glacial landforms and the rate of normal-fault slip over the past ca. 150 k.y. We focus on geomorphic features that record progressive offset over multiple time intervals in order to detect potential secular changes in fault slip rate. Thirty-nine new cosmogenic 3He surface exposure dates and a depth profile establish a late-Pleistocene glacial chronology in the southern Cascade Range of Oregon and constrain the timing of the last two major glacial advances in the region at 17.6 ± 2.1 ka (1σ) and 97.6 ± 12.1 ka. Additionally, these data provide evidence that an older glacial advance likely occurred during marine isotope stage (MIS) 6. Fault scarp profiles from high-resolution airborne lidar, in combination with the exposure age data, allow the calculation of fault slip rates over intervals of ca. 104-105 years. Our calculations indicate dip-slip rates of ~0.3 mm/yr since ca.100 ka, which may represent an increase from < 0.1 mm/yr prior to ca. 100 ka, depending on the absolute age of the older glacial moraines. These rates provide insights into the structure of the Klamath Basin and suggest that despite a complex surface expression, individual fault strands likely merge to a single fault at depth. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185053
作者单位	Geology Department, Western Washington University, Bellingham, WA 98225, United States; Department of Geology, Middlebury College, Middlebury, VT 05753, United States; Berkeley Geochronology Center, Berkeley, CA 94709, United States; College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, United States
推荐引用方式 GB/T 7714	Speth G.T.,Amos C.B.,Amidon W.H.,et al. Glacial chronology and slip rate on the west Klamath Lake fault zone, Oregon[J],2018,131(2021-03-04).
APA	Speth G.T.,Amos C.B.,Amidon W.H.,Balco G.,Meigs A.J.,&Graf S..(2018).Glacial chronology and slip rate on the west Klamath Lake fault zone, Oregon.Bulletin of the Geological Society of America,131(2021-03-04).
MLA	Speth G.T.,et al."Glacial chronology and slip rate on the west Klamath Lake fault zone, Oregon".Bulletin of the Geological Society of America 131.2021-03-04(2018).