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48ka以来日本海古生产力和古氧化还原环境变化的地球化学记录
Geochemical records of paleoproductivity and paleoredox in the Sea of Japan since 48ka
投稿时间:2009-06-17  修订日期:2009-09-24
DOI:
中文关键词:  氧化还原敏感元素  古生产力  古氧化还原环境  日本海
英文关键词:redox sensitive elements  paleoproductivity  paleoredox  Sea of Japan
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
邹建军 国家海洋局第一海洋研究所 zoujianjun@fio.org.cn 
石学法 国家海洋局第一海洋研究所 xfshi@fio.org.cn 
刘焱光 国家海洋局第一海洋研究所  
刘季花 国家海洋局第一海洋研究所  
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中文摘要:
      通过对日本海Ulleung盆地KCES-1孔元素地球化学分析,探讨了过去48ka以来日本海古生产力和古氧化还原环境的变化规律和影响因素。多种替代指标质量累积速率(TOC,CaCO3,磷,过剩钡,镉)显示日本海古生产力自48ka以来发生了显著的变化。48~18ka期间低海平面和有限的水体交换导致表层水生产力相对较低。在18~11ka期间随着海平面的上升,富营养盐水团(亲潮和东海海岸带水团)的流入导致生产力逐渐增大,在11.5~12.6ka期间古生产力达到最大值。在全新世,对马暖流成为影响生产力变化的重要因素,并且自5ka以来生产力保持相对稳定。古氧化还原替代指标(TOC,钼、铀、锰、碳与硫含量之比、自生铀、自生钼)显示在12~9ka期间日本海底层水可能为氧环境。高生产力和底层水体有限的交换是诱发底层水缺氧的主要因素,而这又与全球气候变化和海平面变化有关。
英文摘要:
      The paleoproductivity and paleoredox history in the Sea of Japan since 48ka have been reconstructed using element geochemical data, and factors controlling the change were determined. The mass accumulation of multi-proxies (TOC, CaCO3, phosphorus, cadmium, excess barium) shows that paleoprodutivity has been varied greatly since 48ka. At 48~18ka, a relative lower sea-level and a limited water mass exchange resulted in the lower productivity. At 18~11ka, higher productivity resulted from the rich-nutrients water mass (the Oyasio and the East China Sea coastal water) inflow into the Sea of Japan with relative sea-level rise and the maximum value were observed at 11.5~12.6ka. In the Holocene, Tsushima Warm Current was the main factor that controlled the distribution of paleoproductivity and since 5ka the productivity had been remained relative stable. Proxies about paleoredox (the contents of TOC, molybdenum, uranium and manganese , the ratio of carbon to sulfur content, authigenic uranium and molybdenum contents) indicate that at 12~9ka, the bottom water is anoxic. Both enhanced primary productivity and restricted bottom-water advection triggered the bottom water anoxic and it was also related to global climate change and sea-level change.
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