DOI: 10.1016/j.epsl.2018.04.016
Scopus记录号: 2-s2.0-85046359397
论文题名: Sediment storage in the Southern Alps of New Zealand: New observations from tracer thermochronology
作者: Lang K.A. ; Ehlers T.A. ; Kamp P.J.J. ; Ring U.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 493 起始页码: 140
结束页码: 149
语种: 英语
英文关键词: apatite
; fission-track
; New Zealand
; provenance
; Southern Alps
; thermochronology
Scopus关键词: Apatite
; Catchments
; Erosion
; Fission reactions
; Glacial geology
; Landforms
; Rivers
; Sedimentology
; Tectonics
; Fission track
; New zealand
; provenance
; Southern Alps
; Thermochronology
; Suspended sediments
; apatite
; bedrock
; catchment
; fission track dating
; glaciation
; Holocene
; mountain region
; Pleistocene
; provenance
; sediment transport
; storage
; thermochronology
; tracer
; New Zealand
; South Island
; Southern Alps
英文摘要: Careful study of the processes transporting sediment across Earth's surface is critical for robust interpretation of the sedimentary record. Here we consider the specific influence of cyclic glaciation on the export of sediment from mountain landscapes to ocean basins. Using detrital apatite fission-track tracer thermochronology, we present new observations of sediment provenance from six large river systems draining the eastern flank of the Southern Alps, New Zealand. Detrital cooling ages in all six rivers reflect erosion of partially-reset and fully-unreset bedrock exposed in lower catchment areas and indicate that sediment is not currently contributed in proportion to long-term (>106 yr) erosion patterns. Instead, detrital cooling ages are better explained by either localized erosion along the eastern mountain front or intermontane sediment storage. Of these two alternatives, only intermontane sediment storage is further consistent with suspended sediment flux measurements in eastern rivers. Our observations are consistent with prior interpretations of Holocene sediment retention, and contrast with tracer thermochronology from continental margin deposits indicating sediment was rapidly exported to the continental shelf during the late Pleistocene. Collectively, this evidence argues for a reactive sediment routing system east of the main drainage divide that responds to cyclic glaciation by retaining sediment onshore following deglaciation and evacuating sediment reservoirs offshore during the subsequent glacial advance. Our research demonstrates the importance of intermontane sediment storage on the transmission of high-frequency (∼104–5 yr) climate signals to offshore sedimentary archives while highlighting a novel approach to detailing sediment provenance in tectonically active mountain ranges. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109863
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geosciences, University of Tuebingen, Tuebingen, 72074, Germany; School of Science, University of Waikato, Hamilton, 2001, New Zealand; Department of Geological Sciences, Stockholm University, Stockholm, 10691, Sweden; Department of Geological Sciences, Stockholm University, Stockholm, 10691, Sweden
Recommended Citation:
Lang K.A.,Ehlers T.A.,Kamp P.J.J.,et al. Sediment storage in the Southern Alps of New Zealand: New observations from tracer thermochronology[J]. Earth and Planetary Science Letters,2018-01-01,493