Late Quaternary cycles of mangrove development and decline on the north Australian continental shelf

Grindrod, John; Moss, Patrick; Kaars, Sander van der

doi:10.1002/(sici)1099-1417(199908)14:5<465::aid-jqs473>3.3.co;2-5

Cited by 29 publications

(40 citation statements)

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“…Consequently, siliciclastic material might have ponded behind carbonate highs on the outer shelf during lowstand (Rankey et al, 1999), discharging to slopes and basins only after sea level rose above the shelf-slope break, and waves, tidal currents, and cyclones could erode and remobilize sediment (Steckler et al, 1999;Dunbar et al, 2000). Notably, a major pulse in mangrove pollen marks the siliciclastic-rich interval at ODP Site 820 (Grindrod et al, 1999). The accumulation of terrigenous material, high-Mg calcite, and mangrove pollen on the slope during transgression may collectively signal the release of nearshore sediment on July 6, 2015 geology.gsapubs.org Downloaded from when sea level on the shelf surpasses a critical depth.…”

Section: Discussionmentioning

confidence: 99%

Tropical view of Quaternary sequence stratigraphy: Siliciclastic accumulation on slopes east of the Great Barrier Reef since the Last Glacial Maximum

Page

Dickens

Dunbar

2003

Geol

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Generic models of continental-margin evolution predict that siliciclastic fluxes to slopes should be maximal and minimal during major sea-level lowstands and transgressions, respectively. Here we document the opposite for the northeast Australian margin, the largest extant mixed siliciclastic-carbonate depositional system. Cores from slopes of this margin consistently contain siliciclastic-rich intervals, ϳ0.3-1 m thick, in the upper few meters. Radiocarbon dates of planktonic foraminifera show that this interval was deposited between 12 and 7 ka and represents greatly increased siliciclastic fluxes during late transgression. This massive terrigenous discharge to slopes occurred along at least 450 km of the margin, irrespective of modern variations in bathymetry or climate. Although we cannot dismiss a significantly different early Holocene climate with greatly enhanced sediment discharge, available data instead suggest that rivers aggraded on the shelf during lowstand because of an extensive subaerially exposed reef system. This phenomenon may occur on other margins rimmed by reefs, requiring a major revision of concepts used to interpret mixed siliciclastic-carbonate systems. Figure 1. Sediment accumulation on slopes of tropical mixed system as (A) conventionally modeled and (B) observed on northeast Australian margin, with (C) respect to relative sea level. MAR-mass-accumulation rate.

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Section: Discussionmentioning

confidence: 99%

Tropical view of Quaternary sequence stratigraphy: Siliciclastic accumulation on slopes east of the Great Barrier Reef since the Last Glacial Maximum

Page

Dickens

Dunbar

2003

Geol

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“…It is well known from several other mangrove regions that the mangrove pollen displays maxima during the deglaciation periods (van Campo, 1986;Lézine and VergnaudGrazzini, 1993;Grindrod et al, 1999;van der Kaars et al, 2000), which is consistent with the results of this study. These studies suggested that mangrove material input into marine environments is strongly related to glacio-eustatic sea-level changes.…”

Section: Impacts Of Rapid Sea-level Rise On Mangrove Deposit Erosion 223mentioning

confidence: 99%

“…yr BP (Flemming et al, 1998;Clark et al, 2004), this is even more the case. When the sea-level rise slowed and the transgression substantially decelerated, mangroves could develop again in the newly formed estuaries (Grindrod et al, 1999(Grindrod et al, , 2002 and deltas (Stanley and Warne, 1994). For the Congo region, a phase of extensive coastal mangrove development started at $ 9 k cal.…”

Section: Impacts Of Rapid Sea-level Rise On Mangrove Deposit Erosion 223mentioning

confidence: 99%

Impacts of rapid sea‐level rise on mangrove deposit erosion: application of taraxerol and Rhizophora records

Kim

Dupont

Behling

et al. 2005

J Quaternary Science

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2005. Impacts of rapid sea-level rise on mangrove deposit erosion: application of taraxerol and Rhizophora records.ABSTRACT: We investigated a well-dated marine sediment core from the tropical SE Atlantic covering the last 25 kyr, applying taraxerol and Rhizophora pollen as organic geochemical and palynological proxies for mangrove, respectively. Taraxerol records are positively correlated with Rhizophora pollen records, showing an enhanced supply of mangrove materials into deep-sea environments during the last deglaciation (Termination I). Sedimentation rates peaked during Meltwater Pulses 1A and 1B, which were associated with the maxima of taraxerol and Rhizophora pollen. This study supports the view that mangrove input was dominantly controlled by erosion of mangrove-rich shelf sediments during the transgressions. Whether reworked materials were penecontemporaneous or from much older deposits formed during previous sea-level cycles is discussed.

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“…The latter generally are poorly represented because the bulk of these taxa are insect-pollinated (Dupont and Agwu, 1991;Jahns, 1996). Mangrove, represented by Rhizophora pollen, can be regarded as a proxy for the extent of the coastal mangrove ecosystem and is strongly influenced by the rate of relative sea-level change (Morley, 1995;Grindrod et al, 1999). Dinoflagellate cyst assemblages in recent sediments show a strong relationship with sea-surface conditions (temperature, salinity and nutrients) (Marret and de Vernal, 1997;Rochon et al, 1999), and cyst fluxes can be regarded as a record of oceanic productivity (de Vernal et al, 1998).…”

Section: T89-16 Multiproxy Recordsmentioning

confidence: 99%

Integrated marine and terrestrial evidence for abrupt Congo River palaeodischarge fluctuations during the last deglaciation

Marret

Scourse

Versteegh

et al. 2001

J Quaternary Science

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We present a high-resolution reconstruction of tropical palaeoenvironmental changes for the last deglacial transition (18 to 9 cal. kyr BP) based on integrated oceanic and terrestrial proxies from a Congo fan core. Pollen, grass cuticle, Pediastrum and dinoflagellate cyst fluxes, sedimentation rates and planktonic foraminiferal δ 18 O ratios, u K 37 sea-surface temperature and alkane/alkenone ratio data highlight a series of abrupt changes in Congo River palaeodischarge. A major discharge pulse is registered at around 13.0 cal. kyr BP which we attribute to latitudinal migration of the Intertropical Convergence Zone (ITCZ) during deglaciation. The data indicate abrupt and short-lived changes in the equatorial precipitation regime within a system of monsoonal dynamics forced by precessional cycles. The phases of enhanced Congo discharge stimulated river-induced upwelling and enhanced productivity in the adjacent ocean.

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Late Quaternary cycles of mangrove development and decline on the north Australian continental shelf

Cited by 29 publications

References 0 publications

Tropical view of Quaternary sequence stratigraphy: Siliciclastic accumulation on slopes east of the Great Barrier Reef since the Last Glacial Maximum

Tropical view of Quaternary sequence stratigraphy: Siliciclastic accumulation on slopes east of the Great Barrier Reef since the Last Glacial Maximum

Impacts of rapid sea‐level rise on mangrove deposit erosion: application of taraxerol and Rhizophora records

Integrated marine and terrestrial evidence for abrupt Congo River palaeodischarge fluctuations during the last deglaciation

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