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| Vitali, F; Blanc, G; Larque, P; Samuel, J. |
| The sedimentary sequence recovered at Site 840 ODP in the Tonga Platform is 597 m thick and ranges in age from Holocene to late Miocene. Here, from the 49 samples analysed, three classes of sediments can be identified, based on their proportion of biogenic carbonate and volcanogenic content. These three classes are comparable with those previously differentiated in the Lau Basin (Sites 834-839) and with some sediments from the Tonga Trench Margin (Site 841). In constrast with neighbouring Site 834-839 sediments from the Lau Basin, the Site 840 sediment composition appears to be exempt of hydrothermal pending material and seems to be characterized only by biogenic and terrigenous andesiticrhyolitic volcanic inputs. The alteration of volcanic material... |
| Tipo: Text |
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| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00099/21032/18658.pdf |
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