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- W2386688863 abstract "The rare earth elements (REEs) of 16 sediment samples taken from Core Y127 in the northern Okinawa Trough were measured with ICP-MS. The samples were gravity-cored at 128°18.26′E, 30°32.97′N, 422 cm long, 739 m below the sea level, by Institute of Oceanology, CAS on R/V Science–I in May 1999. The geological age of the bottom core was AMS14C dated for 15ka B.P. The concentration of ΣREE was 102.4μg/g at the top and then increased to 136.1μg/g downwords, averaged at 123.3μg/g from 11.1ka B.P. to the present. From 15ka to 11.1ka B.P., the ΣREE concentration was between 149.1 and 169.2μg/g, in average of 158.6μg/g, increasing downwards. The ratios of ΣLREE/ΣHREE are 8.16 and 9.42 respectively in the two periods, having similar variation to ΣREE. The ratios of La/Sm are 6.70 and 7.15 respectively in the two periods. The results of chondrite normalization show that the REE distribution pattern of the sediment in the northern Okinawa Trough remained the same since 15ka B.P., i.e. the enrichment of LREE and weak depletion of HREE. δEu is between 0.69 and 0.76, which is in scope of intermediate negative Eu abnormity. δCe is between 0.85 and 0.95, weak negative Ce abnormity. After normalization with NASC, REE allocation schema became even, with weak positive Eu abnormity and weak negative Ce abnormity. Comparing REE characteristics of Core Y127 with those of the Changjiang (Yangtze) River and the Yellow River, we found that REE characteristics in the period of 15 ka to 11.1ka B.P. in the trough indicated the nature of provenance. The sediment mainly derived from Changjiang River, the formed REE pattern was mainly constrained by sea level change, depositional environment, and lithology of the provenance. Probably, since the last 11.1ka B.P., only a small amount of sediment was from the Yellow River into the northern Okinawa Trough because of the high sea level stand. With the additions of volcanic matters and biogenic matter, the REE pattern shows different charac- teristics from previous one since the last deglaciation." @default.
- W2386688863 created "2016-06-24" @default.
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- W2386688863 date "2008-01-01" @default.
- W2386688863 modified "2023-09-23" @default.
- W2386688863 title "THE REE IMPRINT ON SEDIMENT PROVENANCE OF THE NORTHERN OKINAWA TROUGH SINCE THE LAST 15ka B.P." @default.
- W2386688863 hasPublicationYear "2008" @default.
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