FLUCTUATIONS OF CARBONATE CONTENT AND ITS CONTROL FACTORS IN THE WESTERN PHILIPPINE SEA FOR THE LAST 150KA
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摘要: 西菲律宾海本哈姆海台的MD06-3050柱状样岩心,上部15万年以来碳酸盐含量变化总体上显示为冰期低、间冰期高的"大西洋型"特征,碳酸盐含量的变化趋势与指示溶解作用强弱的粗组分含量以及有孔虫碎壳率指数总体上呈现相似性,碳酸盐含量虽然与有机碳含量变化趋势相似,但却与初级生产力变化存在较大的差异。该海区晚更新世的碳酸盐含量变化可能受到多个因素控制,其中,溶解作用对碳酸盐含量冰期-间冰期变化的影响最为明显;而溶解作用的发生可能与有机碳/碳酸钙雨率以及深部环流的流通有关。Abstract: The carbonate content of bulk samples was analyzed for the sediment cores of MD06-3050 taken from Benham Rise, western Philippine Sea. The fluctuations in carbonate content for the past 150 ka show a general pattern of the "Atlantic type" of carbonate cycle, i.e. lower in glacials and higher in interglacials. Both sediment coarse fractions and foraminifera fragment ratios were used as indicators of the dissolution intensity of carbonate, and show a similar pattern to carbonate content change since 150 ka. TOC content in bulk samples was also measured, which showed a good consistency with carbonate content. In contrast, the primary productivities derived from the relative abundance of coccolith species F.profunda, yield significantly different trend. By comparison of above proxies, it is inferred that there may be multiple factors controlling the variation in carbonate content, but dissolution is certainly the most important. This dissolution pattern maybe related to the Corg/CaCO3 rain ratio and the ventilation of deep water.
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Keywords:
- carbonate /
- 150 ka /
- primary productivity /
- dissolution /
- western Philippine Sea
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