DOI: 10.1016/j.quascirev.2017.11.034
Scopus记录号: 2-s2.0-85036452127
论文题名: Holocene reef growth over irregular Pleistocene karst confirms major influence of hydrodynamic factors on Holocene reef development
作者: Salas-Saavedra M. ; Dechnik B. ; Webb G.E. ; Webster J.M. ; Zhao J.-X. ; Nothdurft L.D. ; Clark T.R. ; Graham T. ; Duce S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 180 起始页码: 157
结束页码: 176
语种: 英语
英文关键词: Antecedent topography
; Great Barrier Reef
; Holocene reef
; Pleistocene
; Progradation
; U-Th dating
Scopus关键词: Binary alloys
; Buildings
; Fluid dynamics
; Hydrodynamics
; Landforms
; Sea level
; Thorium alloys
; Topography
; Environmental change
; Great Barrier Reef
; Holocenes
; Lateral accretions
; Pleistocene
; Progradation
; Relative contribution
; Unconsolidated sediment
; Reefs
; accretion
; coastal morphology
; environmental change
; hiatus
; Holocene
; hydrodynamics
; karst
; paleoclimate
; paleoenvironment
; Pleistocene
; progradation
; reef
; reef formation
; sea level
; topography
; transect
; uranium series dating
; Australia
; Coral Sea
; Great Barrier Reef
; Heron Island
; Queensland
英文摘要: Many factors govern reef growth through time, but their relative contributions are commonly poorly known. A prime example is the degree to which modern reef morphology is controlled by contemporary hydrodynamic settings or antecedent topography. Fortunately, reefs record essential information for interpreting palaeoclimate and palaeoenvironment within their structure as they accrete in response to environmental change. Five new cores recovered from the margin of Heron Reef, southern Great Barrier Reef (GBR), provide new insights into Holocene reef development and relationships between Holocene reefs and Pleistocene antecedent topography, suggesting much more irregular underlying topography than expected based on the configuration of the overlying modern reef margin. Cores were recovered to depths of 30 m and 94 new 230Th ages document growth between 8408 ± 24 and 2222 ± 16 yrs. BP. One core penetrated Pleistocene basement at ∼15.3 m with Holocene reef growth initiated by ∼8.4 ka BP. However, 1.83 km west along the same smooth margin, four cores failed to penetrate Pleistocene basement at depths between 20 and 30 m, suggesting that the margin at this location overlies a karst valley, or alternatively, the antecedent platform does not extend there. A 48 m-long margin-perpendicular transect of three cores documents the filling of this topographic low, at least 30 m beneath the current reef top, with seaward lateral accretion at a rate of 34.3 m/ka. Cores indicate steady vertical and lateral accretion between 3.2 and 1.8 ka BP with no evidence of the hiatus in reef flat progradation seen in most other offshore reefs of the GBR at that time. These cores suggest that the relative protection afforded by the valley allowed for unconsolidated sediment to accumulate, enabling continuous progradation even when other areas of the reef flat appear to have ‘turned off’. Additionally, the cores suggest that although reefs in the southern GBR clearly owe their location to Pleistocene antecedent topography, modern reef morphology at sea level primarily reflects the interaction of Holocene reef communities with contemporary hydrodynamics. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112325
Appears in Collections: 气候减缓与适应
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作者单位: School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD 4072, Australia; Department of Oceanography and Ecology, Federal University of Espirito Santo, Vitoria, ES CEP-29075-910, Brazil; Geocoastal Research Group, School of Geoscience, University of SydneyNSW 2006, Australia; School of Earth, Environmental and Biological Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, QLD 4001, Australia; Environmental Futures Research Institute, Griffith University, Nathan, QLD 4111, Australia; The College of Science and Engineering, James Cook University, Townsville, QLD 4814, Australia
Recommended Citation:
Salas-Saavedra M.,Dechnik B.,Webb G.E.,et al. Holocene reef growth over irregular Pleistocene karst confirms major influence of hydrodynamic factors on Holocene reef development[J]. Quaternary Science Reviews,2018-01-01,180