DOI: 10.1016/j.quascirev.2014.12.002
Scopus记录号: 2-s2.0-84939424477
论文题名: Constraints on regional drivers of relative sea-level change around Cordova, Alaska
作者: Garrett E. ; Barlow N.L.M. ; Cool H. ; Kaufman D.S. ; Shennan I. ; Zander P.D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 113 起始页码: 48
结束页码: 59
语种: 英语
英文关键词: 1964 alaskan earthquake
; Diatom
; Isolation basin
; Little ice age
; Relative sea level
Scopus关键词: Compaction
; Copper
; Deformation
; Earthquakes
; Geophysics
; Glacial geology
; Ice
; Lakes
; River pollution
; Rivers
; Sediments
; Subsidence
; Diatom
; Earthquake deformation cycles
; Glacial Isostatic Adjustments
; Isolation basin
; Little Ice Age
; Paleoenvironmental change
; Relative sea level
; Relative sea-level changes
; Sea level
; Alaskan earthquake 1964
; deformation mechanism
; diatom
; ice free corridor
; isostasy
; Little Ice Age
; new record
; paleoecology
; paleoenvironment
; peat
; sea level change
; silt
; subsidence
; uplift
; Alaska
; Copper Delta
; Cordova Harbor
; United States
; Bacillariophyta
英文摘要: New records of paleoenvironmental change from two lakes near Cordova, south central Alaska, combined with analysis of previously reported sediment sequences from the adjacent Copper River Delta, provide quantitative constraints on a range of Earth system processes through their expression in relative sea-level change. Basal sediment ages from Upper Whitshed Lake indicate ice-free conditions by at least 14,140-15,040 cal yr BP. While Upper and Lower Whitshed Lakes provide only upper limits to relative sea-level change, interbedded layers of freshwater peat and intertidal silt extending more than 11 m below present sea level in Copper River Delta indicate net submergence over the last 6000 years and multiple earthquake deformation cycles. In contrast, Lower Whitshed Lake, situated just above present high tide level, records only one episode of marine sedimentation, commencing AD 1120-1500, that we interpret as the result of isostatic subsidence due to Little Ice Age mass accumulation of the Chugach Mountain glaciers. Lower Whitshed Lake also records isostatic uplift at the end of the Little Ice Age before the end of marine sedimentation caused by ~1.5 m coseismic uplift in the great Alaska earthquake of AD 1964. We successfully explain the records of relative sea-level change from both Copper River Delta and the Whitshed Lakes by integrating the effects of eustatic sea-level rise, glacial isostasy, earthquake deformation cycles, sediment loading, sediment compaction and Late Holocene changes in glacier mass into a single model. This approach provides initial quantitative constraints on the individual contributions of these processes. Taking reasonable estimates of eustasy, post-Last Glacial Maximum and Neoglacial glacial isostatic adjustment and a simple earthquake deformation cycle, we demonstrate that sediment loading and sediment compaction are both contributors to relative sea-level rise at Copper River Delta, together producing subsidence averaging approximately 1.2 mm yr-1 over the mid to Late Holocene. Further isolation basin studies have the potential to greatly improve our understanding of the individual contributions of these processes in this highly dynamic region. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59989
Appears in Collections: 过去全球变化的重建
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作者单位: Sea Level Research Unit, Department of Geography, Durham University, Durham, United Kingdom; School of Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, AZ, United States
Recommended Citation:
Garrett E.,Barlow N.L.M.,Cool H.,et al. Constraints on regional drivers of relative sea-level change around Cordova, Alaska[J]. Quaternary Science Reviews,2015-01-01,113