碩士 / 國立成功大學 / 地球科學系碩博士班 / 100 / South China Sea (SCS) as the marginal sea is, via river sediment discharges, the major source of a number of elements to the ocean. Thus, SCS plays a role of a source and/or a sink of elements for the ocean. Water mass circulation in the SCS has been widely studied; however information of the margin/ocean interactions and their influence on the oceanic isotopic chemistry is still sparse. Here, we present the REE concentrations, Nd and Sr isotopic data in Fe-Mn oxyhydroxides (authigenic phase) and detrital phase of the core MD05-2901, which developed during the last 32 ka. Moreover, 87Sr/86Sr and εNd analysis of sediments were combined to trace the elemental sources, and to evaluate the relative proportions of different end-members. All of the authigenic phases yielded 87Sr/86Sr values varying from 0.709262 and 0.709313 that are offset from the seawater value of 0.70918, which suggested that some detrital contamination involved in Core MD05-2901. The εNd values in authigenic and detrital phases vary with the abrupt climatic events. During the Bølling/Allerød period, εNd value was as low as -12.10 and -9.6 in detrital and authigenic phases, respectively. In contrast, the εNd value becomes slightly high (-10.28 and -6.3 in detrital and authigenic phases, respectively) during the Younger Dryas event. The paleoclimatic changes affect sediment transport pathways to SCS have been further clarified.
| Identifer | oai:union.ndltd.org:TW/100NCKU5135145 |
| Date | January 2012 |
| Creators | Wei-LanLiao, 廖韋嵐 |
| Contributors | Chen-Feng You, 游鎮烽 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 91 |
Page generated in 0.0017 seconds