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| Wang, Kun-shan; Shi, Xue-fa; Zou, Jian-jun; Kandasamy, Selvaraj; Gong, Xun; Wu, Yong-hua; Yan, Quan-shu. |
| In this study, we investigate light and heavy minerals in sediment core OS03-1 located at the Academy of Sciences Rise of the southern Okhotsk Sea to determine their distributions and sources over the last 180 ka (thousand years). The sediment mainly consists of terrigenous and volcanic detritus. Ubiquitous drop-stones and volcanic detritus throughout the core and high detrital input suggest that sea ice, driven by wind and Kamchatka Current, was the main transport agent of detrital materials to the southern Okhotsk Sea. The ternary diagram of heavy minerals (hornblende-hypersthene-epidote) shows an expansion of detritus provenance from the eastern in cold periods to the northeastern in warm intervals of the Okhotsk Sea. It mainly relates to the shift of... |
| Tipo: Text |
Palavras-chave: Light and heavy minerals; Volcanic detrital; Sediment provenance; Sea ice; Okhotsk Sea. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00420/53145/55348.pdf |
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| Piret, Loic; Bertrand, Sebastien; Kissel, Catherine; De Pol-holz, Ricardo; Tamayo Hernando, Alvaro; Van Daele, Maarten. |
| Megaturbidites have been the focus of many paleoseismic and paleoenvironmental studies because they can provide evidence for catastrophic and/or hazardous events with potentially major environmental implications. During a recent research cruise in Baker Fjord, Chile (47°54′S–74°30′W), a megaturbidite was described between the Northern and Southern Patagonian Icefields. Here, we aim to determine the depositional processes of the megaturbidite and identify its origin. Based on the turbidite's location, a possible origin was the early Holocene drainage of paleo-lake General Carrera, which was recently proposed in the literature as having produced a Glacial Lake Outburst Flood (GLOF) that drained through Baker Fjord. Due to the fjord's location in a subduction... |
| Tipo: Text |
Palavras-chave: Turbidite; Sediment provenance; Patagonia; Holocene; Earthquake. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00425/53700/54551.pdf |
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| Dou, Yanguang; Yang, Shouye; Liu, Zhenxia; Clift, Peter D.; Shi, Xuefa; Yu, Hua; Berne, Serge. |
| The late Quaternary paleoceanography and paleoenvironment in the Okinawa Trough, East China Sea, have been well reconstructed over the last decade, while in contrast the provenance of terrigenous sediments that have accumulated there remains enigmatic. In this study, rare earth elements (REE) were used to investigate provenance changes in sediments from Core DGKS9604, taken from the middle Okinawa Trough. Discrimination plots based on REE fractionation parameters suggest that the cored sediments have variable provenances over the last 30 ka, with the lower part (ca. 31-8.2 ka) ultimately originating mostly from the Changjiang (Yangtze River) and the upper part (7.1-0 ka) primarily from Taiwan. During the Last Glacial Maximum and early deglacial period, sea... |
| Tipo: Text |
Palavras-chave: Sediment provenance; The Okinawa Trough; Kuroshio Current; Rare earth element. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00013/12459/9402.pdf |
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| Villaseñor, Tania; Tentori, Daniel; Marsaglia, Kathleen M.; Pinto, Luisa. |
| Pleistocene glaciations have promoted important landscape transformations as a result of high rates of erosion and rapid sediment evacuation to adjacent marine basins. In the Patagonian Andes the role of the Patagonian Ice Sheet on landscape evolution, in particular the spatial patterns of glacial erosion and its influence on sediment fluxes, is poorly documented. Here, we investigate the Middle and Late Pleistocene sedimentary record of the continental slope from Ocean Drilling Program (ODP) Site 861, offshore Patagonia (46ºS), to evaluate the link between glaciations, mountain range erosion and continental margin strata formation. Petrographic analysis of the sand‐size fraction (0.063‐2 mm) and ƐNd and 87Sr/86Sr measurements in the silt‐size fraction... |
| Tipo: Text |
Palavras-chave: Glacial erosion; Ocean Drilling Program; Patagonia; Patagonian Ice Sheet; Sediment provenance; Source to sink. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00565/67730/67219.pdf |
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