DOI: 10.1016/j.gloplacha.2016.11.018
论文题名: The evolution of the Great Barrier Reef during the Last Interglacial Period
作者: Dechnik B. ; Webster J.M. ; Webb G.E. ; Nothdurft L. ; Dutton A. ; Braga J.-C. ; Zhao J.-X. ; Duce S. ; Sadler J.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2017
卷: 149 起始页码: 53
结束页码: 71
语种: 英语
英文关键词: Great Barrier Reef
; Last Interglacial
; Palaeoenvironment
; Reef growth
; Sea-level
Scopus关键词: Glacial geology
; Mass spectrometry
; Sea level
; Stabilization
; Great Barrier Reef
; Last interglacial
; Marine Isotope Stage 7
; Palaeoenvironment
; Reef accretions
; Reef growths
; Sedimentary facies
; System evolution
; Reefs
; Anthozoa
英文摘要: Reef response to Last Interglacial (LIG) sea level and palaeoenvironmental change has been well documented at a limited number of far-field sites remote from former ice sheets. However, the age and development of LIG reefs in the Great Barrier Reef (GBR) remain poorly understood due to their location beneath modern living reefs. Here we report thirty-nine new mass spectrometry U-Th ages from seven LIG platform reefs across the northern, central and southern GBR. Two distinct geochemical populations of corals were observed, displaying activity ratios consistent with either closed or open system evolution. Our closed-system ages (~ 129–126 ka) provide the first reliable LIG ages for the entire GBR. Combined with our open-system model ages, we are able to constrain the interval of significant LIG reef growth in the southern GBR to between ~ 129–121 ka. Using age-elevation data in conjunction with newly defined coralgal assemblages and sedimentary facies analysis we have defined three distinct phases of LIG reef development in response to major sea level and oceanographic changes. These phases include: Phase 1 (> 129 ka), a shallow-water coralgal colonisation phase following initial flooding of the older, likely Marine Isotope Stage 7 (MIS7) antecedent platform; Phase 2 (~ 129 ka), a near drowning event in response to rapid sea level rise and greater nutrient-rich upwelling and; Phase 3 (~ 128–121 ka), establishment of significant reef framework through catch-up reef growth, initially characterised by deeper, more turbid coralgal assemblages (Phase 3a) that transition to shallow-water assemblages following sea level stabilisation (Phase 3b). Coralgal assemblage analysis indicates that the palaeoenvironments during initial reef growth phases (1 and 2) of the LIG were significantly different than the initial reef growth phases in the Holocene. However, the similar composition of ultimate shallow-water coralgal assemblages and slow reef accretion rates following stabilisation of sea level (phase 3b) suggest that reefs of both ages developed in a similar way during the main phase of relatively stable sea level. © 2017 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85008319863&doi=10.1016%2fj.gloplacha.2016.11.018&partnerID=40&md5=9035c420d261fe6f133361f623579435
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11761
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Geocoastal Research Group, Department of Geosciences, University of Sydney, School of Geosciences (F09), University of SydneyNSW, Australia
Recommended Citation:
Dechnik B.,Webster J.M.,Webb G.E.,et al. The evolution of the Great Barrier Reef during the Last Interglacial Period[J]. Global and Planetary Change,2017-01-01,149.