New Guinea and its coastal seas, a testable model of wet tropical coastal processes: an introduction to Project TROPICS

Brunskill, G. J.

doi:10.1016/j.csr.2004.08.001

Cited by 38 publications

(18 citation statements)

References 167 publications

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“…In the southern New Guinea, the Gulf of Papua (GOP) has a broad (~150 km) and gentle (gradient ~1:750) shelf (Figure 1) [11]. Previous studies suggested that the majority of river sediment load with sources mainly from the Fly River accumulates at their estuaries, instead of crossing the shelf, and only a very small part (<5%, [11]) could be carried into the deep sea by means of nepheloid layers [10,23,24]. The northern New Guinea is situated at the leading edge of the Australian Plate and yields fluvial sediments as high as 0.86×10 9 t a 1 , but the transport of sediments behaves very differently [6,7].…”

Section: Regional Backgroundmentioning

confidence: 99%

“…The northern and southern New Guinea have the contrasting styles of sediment accumulation. When the sea level is high, most inputs of the Fly River in the southern New Guinea deposit on the broad shelf; only few materials could be carried to the deep sea by surface currents when the northwest monsoon prevails, and then incorporates in the subsurface currents [6,7,11,24]. In contrast, on the active continental margin, river inputs can directly bypass the slope via high-density turbidity currents and such like ways induced by sediment gravity, and even transport for a long distance within the oceanic currents, regardless of sea level change.…”

Section: Provenance Of Clay Mineralsmentioning

confidence: 99%

“…In contrast, on the active continental margin, river inputs can directly bypass the slope via high-density turbidity currents and such like ways induced by sediment gravity, and even transport for a long distance within the oceanic currents, regardless of sea level change. The Sepik River in the northern New Guinea is a case in point [6,7,10,11,23,24].…”

Section: Provenance Of Clay Mineralsmentioning

confidence: 99%

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Late quaternary glacial cycle and precessional period of clay mineral assemblages in the western pacific warm pool

Liu

Zhou

2012

Chin. Sci. Bull.

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Variability of clay mineral assemblages in the Western Pacific Warm Pool (WPWP) over the past 370 ka shows the prominent glacial-interglacial cyclicity. Smectite (62%-91%) is the dominant clay mineral, with decreased contents during interglacials while increased in glacials. In contrast, variations in chlorite (4%-21%), illite (4%-12%), and kaolinite (2%-10%) share a similar pattern with higher contents during interglacials than glacials, mirroring to that of smectite. The results indicate that the smectite-dominated clay minerals derive mainly from the river detrital inputs of New Guinea. The glacial-interglacial cycle of clay mineral assemblages well correspond to the fluctuation of sea level. When the sea level was low, the river materials can travel more easily across the narrow shelf off the island of New Guinea, inject directly into the subsurface currents flowing westwards, then merge into the Equatorial Undercurrent (EUC), and eventually deposit on the central part of WPWP. Precessional periods of the smectite content indicate the intensity of mechanical erosion in its provenance of New Guinea, responding to the river runoff and precipitation, and this could also be linked to the meridional migration of the Intertropical Convergence Zone (ITCZ).

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Section: Regional Backgroundmentioning

confidence: 99%

Section: Provenance Of Clay Mineralsmentioning

confidence: 99%

Section: Provenance Of Clay Mineralsmentioning

confidence: 99%

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Late quaternary glacial cycle and precessional period of clay mineral assemblages in the western pacific warm pool

Liu

Zhou

2012

Chin. Sci. Bull.

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“…Clinoform sediments are dominated by terrestrial reworked sediments predominately sourced by the large rivers mentioned above ( Figure 1). The bedrock geology of western Papua New Guinea consists of uplifted terrestrial and marine sedimentary deposits of Neogene age (Davies 2012), with lesser quantities of Neogene volcanics and low-grade metamorphic rocks (Milliman 1995;Brunskill 2004).…”

Section: Study Areamentioning

confidence: 99%

Assessing palaeobathymetry and sedimentation rates using palynomaceral analysis: a study of modern sediments from the Gulf of Papua, offshore Papua New Guinea

et al. 2015

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A Nittrouer (2015): Assessing palaeobathymetry and sedimentation rates using palynomaceral analysis: a study of modern sediments from the Gulf of Papua, offshore Papua New Guinea, Palynology, Palynologists interested in better understanding the sedimentation and energy of depositional environments have often included studies of palynomaceral fragments, particularly when performing palynofacies analyses. Due to the difficult nature of classifying these fragments, researchers have developed numerous, often overlapping, classification schemes. These different schemes make it difficult to compare and contrast between research projects. Determining the appropriate scheme to apply when counting these fragments can be confusing, and application of these schemes can yield inconclusive results, especially when sedimentation and energy are in constant flux. A scheme of five categories, including brown wood (palynomaceral 1À2), leaf cuticle (palynomaceral 3), black debris (palynomaceral 4), structureless organic matter (SOM) and resin, is utilised here. It is applied to the analysis of 64 modern samples from the top 0À4 cm of sediment collected throughout the Gulf of Papua, Papua New Guinea. These samples span a suite of common marine depositional environments: river mouths and deltas, the proximal portion of the continental shelf dominated by a large clinoform, and turbidite and hemipelagic/pelagic deposits on the slope and in the deep ocean basin. Principal component analysis (PCA) confirms this simplified classification scheme provides an indirect means of assessing distance from shore and shelf-slope break, overall water depth and sediment accumulation rate, but other factors, such as processing technique, marine productivity, sediment source, time in transport and residence and bioturbation, are taken into account to fully explain distribution.

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“…1). Major rivers, coming from central New Guinea, receive input from rainfall and glacier meltwater, and then drain to the Gulf of Papua (GoP) (Brunskill 2004). These rivers deliver more thañ 365 mT sediments per year to the GoP (Milliman 1995).…”

Section: Introductionmentioning

confidence: 99%

Orbital-scale variation in the magnetic content as a result of sea level changes in Papua New Guinea over the past 400 ka

2015

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We describe the orbital-scale environmental variation around Papua New Guinea (PNG) for the last 400 ka based on the environmental magnetism. Six magnetic parameters and the δ 18 O record of the core MD05-2928 are presented in the study. Results of magnetic analyses reveal opposite responses to different environmental conditions: Magnetic minerals were relatively fewer and finer in interglacial periods and were more and coarser in glacial periods. The reason could be suggested: In interglacial periods, sediments coming from central New Guinea were transported by the coastal currents in the northern Coral Sea and then imported to the core site location. Magnetic minerals would be relatively fewer and finer due to this longer transportation process. In glacial periods, the routes of the currents might regress seaward with reduced current intensity because of lower sea level. Main sediment sources would shift to the Papuan Peninsula relatively near the core site, and therefore, the magnetic minerals became more and coarser. Further, period analyses using the eccentricity, tilt, and precession (ETP) curves and the wavelet spectra were applied to the study to analyze the periodicities embedded in the parameters. Results of both period analyses clearly present the Milankovitch periods, indicating the dominance of the orbital forcing in this area. The strongest signal of 100-ka period reveals that sea level change played the dominant role in long-term environmental setting for the past~400 ka. However, influences of 40-and 20-ka periods, possibly related to regional precipitation, should also be considered though they might be second factors affecting the environmental variation around PNG.

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New Guinea and its coastal seas, a testable model of wet tropical coastal processes: an introduction to Project TROPICS

Cited by 38 publications

References 167 publications

Late quaternary glacial cycle and precessional period of clay mineral assemblages in the western pacific warm pool

Late quaternary glacial cycle and precessional period of clay mineral assemblages in the western pacific warm pool

Assessing palaeobathymetry and sedimentation rates using palynomaceral analysis: a study of modern sediments from the Gulf of Papua, offshore Papua New Guinea

Orbital-scale variation in the magnetic content as a result of sea level changes in Papua New Guinea over the past 400 ka

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