Clinoform mechanics in the Gulf of Papua, New Guinea

Walsh, J. P.; Nittrouer, Charles A.; Palinkas, C. M.; Ogston, A. S.; Sternberg, Richard W.; Brunskill, G. J.

doi:10.1016/j.csr.2004.07.019

Cited by 173 publications

(227 citation statements)

References 65 publications

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“…5). This contrasts with the accumulation rate and thickness profiles of constructional clinoforms, characterized by sedimentation rates greatest along the foreset portion and significantly lower towards both the topset and the bottomset (e.g., Alexander et al, 1991;Leithold, 1993;Michels et al, 1998;Pirmez et al, 1998;Walsh et al, 2004;Palinkas and Nittrouer, 2006;Cattaneo et al, 2007;Pellegrini et al, 2015) (Figs. 10-18).…”

Section: Clinoform Genesis and Dynamics: Active Versus Passive Clinofcontrasting

confidence: 39%

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Clinoforms and clinoform systems: Review and dynamic classification scheme for shorelines, subaqueous deltas, shelf edges and continental margins

Patruno

Helland‐Hansen

2018

Earth-Science Reviews

188

166

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A B S T R A C TClinoforms are inclined and normally basinward-dipping horizons developed over a range of spatial and temporal scales in both siliciclastic and carbonatic systems. The study of clinoform successions underpins sequence stratigraphy and all efforts to reconstruct the relative partitioning of reservoir, seal and source rocks along shoreline to basin-floor profiles.Here, we review clinoform research and propose a more systematic description and classification of clinoforms. This is a crucial step to improve predictions of facies and lithology distribution within shoreline to continental shelf and abyssal plain successions, together with the genesis, drivers and dynamics of their constituent sedimentary units.Four basic clinoform types are here distinguished in delta/shorelines, lacustrines and marine environments, on the basis of their overall spatial and temporal scale, morphology, outbuilding dynamic and geodynamic and depositional setting: (1, 2) delta-scale clinoforms, which in turns are sub-divided into shoreline and delta-scale subaqueous clinoforms; (3) shelf-edge clinoforms; and (4) continental-margin clinoforms. Delta-scale clinoform sets are tens of metres high and typically represent 1-10 3 kyr, with progradation rates ranging from 1,000-100,000 m/kyr for shorelines and "subaerial deltas" to 100-20,000 m/kyr for subaqueous deltas; shelfedge clinoform sets are hundreds of metres high and are nucleated and accreted in 0.1-20 Myr (usual progradation rates of 1-100 m/kyr) by successive cross-shelf transits of delta-scale clinoforms; continental-margin clinoform sets are thousands of metres high, hallmark key geodynamic/crustal boundaries (e.g., continent/ocean transition) and slowly prograde basinwards in ca. 5-100 Myr, with typical rates of 0.1-10 m/kyr. As a consequence of the very different progradation rates and of the difficulty of large-scale clinothems to backstep during transgressions, shorelines are the most dynamic clinoforms with regards to position, continental margins the least, and shelf-edges are intermediate. Shortly after a transgression, therefore, the four clinoform types may prograde synchronously along shoreline-to-abyssal plain transects, forming "compound clinoform" systems. During the subsequent regressive cycle, however, due to the dissimilarity in progradation rates, different clinoform types will normally merge progressively with each other, giving rise to "hybrid clinoforms" (e.g., shelf-edge deltas), and fewer depositional breaks-in-slope are distinguished along a single shoreline-toabyssal plain transect. Overall, all clinoform systems are the result of the dynamic evolution of compound and hybrid clinoforms along a temporal and spatial continuum, regulated by the cyclical backstepping of the smallerscale system within natural progradational-retrogradational cycles of larger-scale clinothem outbuilding.All clinothem types may show either an accretionary/active or draping/passive style, depending on the proximity to the sediment source. Draping clinothems are nearly...

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Section: Clinoform Genesis and Dynamics: Active Versus Passive Clinofcontrasting

confidence: 39%

“…sediment motion threshold, leading to the thick foreset deposition ( Fig. 6b; Kuehl et al, 1986Kuehl et al, , 1997Driscoll and Karner, 1999;Hernández-Molina et al, 2000a;Walsh et al, 2004;Swenson et al, 2005;Puig et al, 2007;Jaramillo et al, 2009;Sheremet et al, 2011;Mitchell, 2012;Mitchell et al, 2012;Qiu et al, 2014).…”

Section: Delta Scale Clinoformsmentioning

confidence: 99%

Clinoforms and clinoform systems: Review and dynamic classification scheme for shorelines, subaqueous deltas, shelf edges and continental margins

Patruno

Helland‐Hansen

2018

Earth-Science Reviews

188

166

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“…If we accept a sedimentation rate of 2 cm a 21 (cf. Walsh et al 2004), which would bury an ammonite lying horizontally on the seafloor relatively quickly, we come to the conclusion that the entire Jet Rock succession could represent less than 2 ka of sedimentation, and that most of the time is recorded in bedding planes and other surfaces produced by erosion and nondeposition. This illustrates how measured sediment accumulation rates are inversely related to the time span for which they are determined (Sadler 1981).…”

Section: More Gaps Than Shale: Effect Of Erosion On Preserved Signalsmentioning

confidence: 99%

More gaps than shale: erosion of mud and its effect on preserved geochemical and palaeobiological signals

Trabucho‐Alexandre¹

2014

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“…1). At the present day, most sediments coming from central New Guinea would be stored on the inner shelf (Brunskill et al 1995;Wolanski et al 1995;Harris et al 1996;Walsh et al 2004;Keen et al 2006). Only finer terrestrial detritus might be brought to the core site location by ocean currents.…”

Section: Magnetic Properties Related To Environmental Settingmentioning

confidence: 99%

“…These rivers deliver more thañ 365 mT sediments per year to the GoP (Milliman 1995). Most detritus discharged by the rivers from New Guinea is stored on the inner shelf (Brunskill et al 1995;Wolanski et al 1995;Harris et al 1996;Walsh et al 2004;Keen et al 2006). Only less than 5 % of finer (suspended) sediments may be delivered eastwardly along the shelf by the coastal currents (Walsh and Nittrouer 2003;Muhammad et al 2008).…”

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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Clinoform mechanics in the Gulf of Papua, New Guinea

Cited by 173 publications

References 65 publications

Clinoforms and clinoform systems: Review and dynamic classification scheme for shorelines, subaqueous deltas, shelf edges and continental margins

Clinoforms and clinoform systems: Review and dynamic classification scheme for shorelines, subaqueous deltas, shelf edges and continental margins

More gaps than shale: erosion of mud and its effect on preserved geochemical and palaeobiological signals

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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