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Registros recuperados: 7
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Neogene evolution of the mixed carbonate-siliciclastic system in the Gulf of Papua, Papua New Guinea ArchiMer
Tcherepanov, Evgueni N.; Droxler, Andre W.; Lapointe, Philippe; Dickens, Gerald R.; Bentley, Sam J.; Beaufort, Luc; Peterson, Larry C.; Daniell, James; Opdyke, Bradley N..
This paper outlines the evolution of the late Cenozoic mixed carbonate-siliciclastic depositional system in the Gulf of Papua (GoP), using seismic, gravity, multibeam bathymetry, well data sets, and Landsat imagery. The deposition of the mixed sedimentary sequences was influenced by dynamic interplay of tectonics, eustasy, in situ carbonate production, and siliciclastic sediment supply. The roles of these major factors are estimated during different periods of the GoP margin evolution. The Cenozoic mixed system in the GoP formed in distinct phases. The first phase ( Late Cretaceous-Paleocene) was mostly driven by tectonics. Rifting created grabens and uplifted structural blocks which served later as pedestals for carbonate edifices. Active neritic...
Tipo: Text Palavras-chave: Great barrier reef; Sea level; Tectonic controls; Ice volume; Platforms; Sedimentation; Fluctuations; Deposition; Australia; Foreland basin.
Ano: 2008 URL: https://archimer.ifremer.fr/doc/00208/31939/30357.pdf
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Benthic Foraminiferal response to sea level change in the mixed siliciclastic-carbonate system of southern Ashmore Trough (Gulf of Papua) ArchiMer
Carson, Brooke E.; Francis, Jason M.; Leckie, R. Mark; Droxler, Andre W.; Dickens, Gerald R.; Jorry, Stephan J.; Bentley, Sam J.; Peterson, Larry C.; Opdyke, Bradley N..
Ashmore Trough in the western Gulf of Papua (GoP) represents an outstanding modern example of a tropical mixed siliciclastic-carbonate depositional system where significant masses of both river-borne silicates and bank-derived neritic carbonates accumulate. In this study, we examine how benthic foraminiferal populations within Ashmore Trough vary in response to sea level-driven paleoenvironmental changes, particularly organic matter and sediment supply. Two 11.3-m-long piston cores and a trigger core were collected from the slope of Ashmore Trough and dated using radiocarbon and oxygen isotope measurements of planktic foraminifera. Relative abundances, principal component analyses, and cluster analyses of benthic foraminiferal assemblages in sediment...
Tipo: Text Palavras-chave: Papua New Guinea; Margins; Foraminifera.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00087/19837/17482.pdf
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Deep water geomorphology of the mixed siliciclastic-carbonate system, Gulf of Papua ArchiMer
Francis, Jason M.; Daniell, James J.; Droxler, Andre W.; Dickens, Gerald R.; Bentley, Samuel J.; Peterson, Larry C.; Opdyke, Bradley N.; Beaufort, Luc.
The Gulf of Papua (GoP) has become a focal point for understanding the deposition and accumulation of siliciclastic and carbonate material along and across a low-latitude continental margin. Although studies have addressed submarine geomorphological features on the inner and middle shelves, as well as processes that may have led to their formation, the seafloor of adjacent slope regions remains poorly documented. This study presents and interprets results from approximately 13,000 line-km of multibeam bathymetry, 9500 line-km of 3.5 kHz seismic, and 122 sediment cores that were collected from the GoP shelf edge and slope, primarily on two cruises (PANASH and PECTEN). Bathymetric maps, in conjunction with the seismic profiles and cores, were used to make...
Tipo: Text Palavras-chave: Great barrier reef; New Guinea; Platform margin; Foreland basin; OF Papua; Sedimentation; Shelf; Bank; Circulation; Australia.
Ano: 2008 URL: https://archimer.ifremer.fr/doc/00208/31938/30356.pdf
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Variations in temperature and salinity of the surface water above the middle Okinawa Trough during the past 37 kyr ArchiMer
Yu, Hua; Liu, Zhenxia; Berne, Serge; Jia, Guodong; Xiong, Yingqian; Dickens, Gerald R.; Wei, Gangjian; Shi, Xuefa; Liu, J. Paul; Chen, Fajin.
East China Sea (ECS) is an important climate modulator of East Asia. In the last glacial period, the global sea level, the path and strength of the Kuroshio Current experienced great changes; combined with the variable volume of fresh run-off input, they made the hydrographic situation in the ECS quite different from nowadays. Based on high-resolution alkenone-sea surface temperature (SST) and oxygen isotope composition of planktonic foraminifera Globigerinoides sacculifer we reconstructed paleo-sea surface salinity (SSS) of a long piston core DGKS9604 retrieved from the middle Okinawa Trough of the eastern ECS. The delta O-18 and SST records display significant variations with global ice volume. Synchrony of the millennial-scale climate events like YD and...
Tipo: Text Palavras-chave: Sea surface salinity; Sea surface temperature; East Asian monsoon; Kuroshio Current; Okinawa Trough; East China Sea.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-7398.pdf
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High-resolution and high-precision correlation of dark and light layers in the Quaternary hemipelagic sediments of the Japan Sea recovered during IODP Expedition 346 ArchiMer
Tada, Ryuji; Irino, Tomohisa; Ikehara, Ken; Karasuda, Akinori; Sugisaki, Saiko; Xuan, Chuang; Sagawa, Takuya; Itaki, Takuya; Kubota, Yoshimi; Lu, Song; Seki, Arisa; Murray, Richard W.; Alvarez-zarikian, Carlos; Anderson, William T., Jr.; Bassetti, Maria-angela; Brace, Bobbi J.; Clemens, Steven C.; Da Costa Gurgel, Marcio H.; Dickens, Gerald R.; Dunlea, Ann G.; Gallagher, Stephen J; Giosan, Liviu; Henderson, Andrew C. G.; Holbourn, Ann E.; Kinsley, Christopher W.; Lee, Gwang Soo; Lee, Kyung Eun; Lofi, Johanna; Lopes, Christina I. C. D.; Saavedra-pellitero, Mariem; Peterson, Larry C.; Singh, Raj K.; Toucanne, Samuel; Wan, Shiming; Zheng, Hongbo; Ziegler, Martin.
The Quaternary hemipelagic sediments of the Japan Sea are characterized by centimeter-to decimeter-scale alternation of dark and light clay to silty clay, which are bio-siliceous and/or bio-calcareous to a various degree. Each of the dark and light layers are considered as deposited synchronously throughout the deeper (> 500 m) part of the sea. However, attempts for correlation and age estimation of individual layers are limited to the upper few tens of meters. In addition, the exact timing of the depositional onset of these dark and light layers and its synchronicity throughout the deeper part of the sea have not been explored previously, although the onset timing was roughly estimated as similar to 1.5 Ma based on the result of Ocean Drilling Program...
Tipo: Text Palavras-chave: Quaternary sediments; Japan Sea; Inter-site correlation; High-resolution age model; IODP; Expedition 346; U1424; U1425; U1426; U1430.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00437/54817/56292.pdf
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Bundled turbidite deposition in the central Pandora Trough (Gulf of Papua) since Last Glacial Maximum: Linking sediment nature and accumulation to sea level fluctuations at millennial timescale ArchiMer
Jorry, Stephan J.; Droxler, Andre W.; Mallarino, Gianni; Dickens, Gerald R.; Bentley, Sam J.; Beaufort, Luc; Peterson, Larry C.; Opdyke, Bradley N..
Since Last Glacial Maximum (23-19 ka), Earth climate warming and deglaciation occurred in two major steps (Bolling-Allerod and Preboreal), interrupted by a short cooling interval referred to as the Younger Dryas (12.5-11.5 ka B. P.). In this study, three cores (MV-33, MV-66, and MD-40) collected in the central part of Pandora Trough (Gulf of Papua) have been analyzed, and they reveal a detailed sedimentary pattern at millennial timescale. Siliciclastic turbidites disappeared during the Bolling-Allerod and Preboreal intervals to systematically reoccur during the Younger Dryas interval. Subsequent to the final disappearance of the siliciclastic turbidites a calciturbidite occurred during meltwater pulse 1B. The Holocene interval was characterized by a lack...
Tipo: Text Palavras-chave: Younger dryas event; Oxygen isotope records; Meltwater pulse 1a; Great barrier reef; Pacific warm pool; Carbonate platforms; Tropical atlantic; Surface salinity; Nicaragua rise; Caribbean sea.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00079/19014/16592.pdf
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Thinned crust in southwest Pacific may harbor gas hydrate ArchiMer
Auzende, Jean-marie; Dickens, Gerald R.; Van De Beuque, Sabrina; Exon, Neville F.; François, Caroline; Lafoy, Yves; Voutay, Olivier.
The Lord Howe Rise (LHR) is a large, complex, and poorly studied fragment of thinned continental crust submerged 750–3000 m beneath the oligotrophic waters of the central Tasman Sea (Figure 1). Deep seismic profiles taken during recent cruises in the region have revealed an intriguing phenomenon: the eastern slope of the LHR has a prominent and extensive bottom simulating reflector (BSR) that cross‐cuts lithology at 0.65–0.75 s two‐way travel time (twt) [Exon et al., 1998; Lafoy et al., 1998]. Given best estimates for sonic velocity (1600 m/s) and thermal gradients (0.9+0.04°C/m) in sediment on the LHR, predicted temperatures and pressures at the depth of the BSR lie on the CH4‐CH4 hydrate‐seawater equilibrium curve. Thus, the BSR on the LHR most likely...
Tipo: Text
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00451/56251/57822.pdf
Registros recuperados: 7
Primeira ... 1 ... Última
 

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