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新近纪南海深层水的增氧与分层

Deep Water Ventilation and Stratification in the Neogene South China Sea

综合南海ODP1148站、1146站和1143站沉积物物性、底栖有孔虫、同位素等资料,探讨早中新世以来南海深层水的演化特征.结果表明,在21~17 Ma、15~10 Ma和10~5 Ma3个时间段分别对应3个富含红褐色粘土的岩性单元,其红色参数(a*)增高指示南海深层水中溶解氧含量的增加.对比发现,前两阶段的深层水增氧与南极底层水和北大西洋组合水增强有关,说明10 Ma前南海与外地的底层水基本是相互连通的.10 Ma以后,南海深层水溶解氧降低,同时分别处于下深层水的1148站和上深层水的1146站之间的CaCO3含量变化加大,喜氧底栖有孔虫减少,底栖δ13C在~10 Ma大幅度减轻,说明南海当时的深层水受大洋深层水的控制减弱.推测主要是南海海盆自16~15 Ma停止扩张以后,南海逐渐关闭引起本地深层水开始形成的缘故.从6 Ma左右开始出现大量的太平洋底层水和深层水的底栖有孔虫标志种,1148站和1146站在5~3 Ma期间的CaCO3含量之差达到40%,标志南海深层水最大分异期.除了全球气候变冷、北半球结冰引起太平洋深层水扩张的影响之外,南海海盆由于更强烈向东俯冲而进一步下沉也可能是原因之一.3 Ma以来南海深层水演化进入现代模式,两站之间的CaCO3含量之差稳定在10%左右,厌氧底栖种丰度增加.太平洋底层水和深层水的标志种相继在1.2 Ma和0.9Ma大量减少,底栖δ13C也同时大幅度变轻到新近纪的最低值,表明太平洋底层水的影响基本消失,太平洋深层水的影响也大大减弱.因此,标准现代模式的南海深层水,推测主要由于"中更新世气候转型"时期巴士海峡下面的海槛抬升到接近目前~2 600 m的深度时,才开始形成.

作 者:
李前裕 赵泉鸿 钟广法 翦知湣 田军 成鑫荣 陈木宏 LI Qian-yu ZHAO Quan-hong ZHONG Guang-fa JIAN Zhi-min TIAN Jun CHENG Xin-rong CHEN Mu-hong  
作者单位:
李前裕,LI Qian-yu(同济大学海洋地质国家重点实验室,上海,200092;阿德莱得大学地球与环境科学学院,澳大利亚,SA5005)
赵泉鸿,钟广法,翦知湣,田军,成鑫荣,ZHAO Quan-hong,ZHONG Guang-fa,JIAN Zhi-min,TIAN Jun,CHENG Xin-rong(同济大学海洋地质国家重点实验室,上海,200092)
陈木宏,CHEN Mu-hong(中国科学院南海海洋研究所,广州,510301) 
刊 名:
地球科学-中国地质大学学报  ISTIC EI PKU
英文刊名:
EARTH SCIENCE-JOURNAL OF CHINA UNIVERSITY OF GEOSCIENCES 
年,卷(期):
2008 33(1) 
分类号:
P736.22 
关键词:
南海 知识脉络  中新世 知识脉络  上新世 知识脉络  更新世 知识脉络  深层水演化 知识脉络  增氧 知识脉络  碳酸盐沉积 知识脉络  氧碳同位素. 知识脉络 
机标分类号:
P73 P31 
机标关键词:
南海海盆深层水增氧分层太平洋南极底层水有孔虫中更新世气候转型水的影响溶解氧含量标志演化特征推测气候变冷模式扩张含量变化北大西洋巴士海峡中新世 
基金项目:
国家自然科学基金,国家重点基础研究发展计划(973计划) 
DOI:
 
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