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地球科学进展  2013, Vol. 28 Issue (2): 269-281    DOI: 10.11867/j.issn.1001-8166.2013.02.0269
IODP研究     
南塔斯曼海隆2 Ma以来碳酸钙沉积记录及其对环流系统和轨道周期的响应
胡正莹1,王汝建1*,李文宝2
1.同济大学海洋地质国家重点实验室,上海 200092;2.内蒙古农业大学水利与土木建筑工程学院, 内蒙古 呼和浩特 010018
A CaCO3 Deposition Record During the Last 2 Ma in Southern Tasman Rise of Southern Ocean and Its Responses to the Circulation System and Orbital Cycles
Hu Zhengying1, Wang Rujian1, Li Wenbao2
1.State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;
2.Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Huhhot 010018, China
 全文: PDF(1632 KB)  
摘要:

南大洋CaCO3沉积在记录生物泵调节大气CO2的同时,也记录了南大洋表层锋面系统和深部环流格局的重要转变。通过南塔斯曼海ODP 1170站位2 Ma以来CaCO3 %和MAR-CaCO3的研究发现,CaCO3 %以冰期低和间冰期高的“大西洋”型溶解作用旋回为主,并以MIS 34/35期(约1.15 Ma BP)和MIS 14/15期(约0.55 Ma BP)为界线,表现出3种沉积模式。而MAR-CaCO3以MIS 57/58,21/22,13/14和11/12为界表现出“两高三低”5个阶段。CaCO3 %与轨道参数ETP和底栖有孔虫δ18O的交叉频谱和小波分析显示,其主导周期明显具有从40 ka向100 ka转变的中更新世气候转型(MPT)特征,转型起始与终止时间为1.15~0.55 Ma BP。CaCO3沉积模式的转变与南大洋太平洋区西风带和环南极表层锋面系统的迁移密切相关,在时间上与MPT同步。MPT时期,西风带和环南极表层锋面系统的快速南北迁移,导致CaCO3沉积受到硅质和陆源物质稀释作用的影响。而MAR-CaCO3的阶段性变化主要与南大洋深层环流的变化格局和水团化学性质的变化有关。在1.5~0.85 Ma BP期间,南大洋太平洋区深层水通风增强,利于CaCO3的保存和埋藏,MAR-CaCO3增加;在0.85~0.55 Ma BP期间,CO 32-处于不饱和状态的CDW增强,导致南大洋深部CaCO3溶解作用增强,溶跃面上升,MAR-CaCO3降低。

关键词: CaCO3沉积作用轨道周期环流系统ODP 1170站南大洋    
Abstract:

The Southern Ocean CaCO3 deposition not only records the processes of the biological pump modulating atmospheric CO2, but also the changes in Southern Ocean surface frontal system and the structure of deep ocean circulation. CaCO3% and its mass accumulation rate (MAR) changes at Tasman Sea site ODP 1170 during the past 2 Ma indicate a “Atlantic-style” feature with low CaCO3% during glacials and high during interglacials. Three  sedimentary regimes are presented roughly bounded by MIS 34/35 (1.15 Ma BP) and MIS 14/15 (0.55 Ma BP); and the MAR-CaCO3 represents five phases fluctuation. Cross-spectrum and wavelet analysis of CaCO3% and orbital parameters ETP, and benthic  δ18O records show clear Mid-Pleistocene Transition (MPT) pattern of the main cyclicity transits from 40 ka to 100 ka, from 1.15 to 0.55 Ma BP. The changes in CaCO3 deposition are closely related to the changes in Southern Westerlies and Antarctic Circumpolar Current(ACC) frontal system, and synchronous with the MPT. During the MPT, the rapid migration of the Southern Westerlies and ACC frontal system resulted in the dilution effect of siliceous deposition and terrigeneous input to the CaCO3 deposition. The MAR-CaCO3 variability is related to the changes in deepwater structure and its chemical properties. At 1.5~0.85 Ma BP, Southern Ocean deep water ventilation was enhanced, which favored the preservation of CaCO3 and increased the MAR-CaCO3; at  0.85~0.55 Ma BP, CO2-3 depleted Circumpolar Deep Water was enhanced, resulting in the dissolution of CaCO3, and the rise of lysocline and decrease of MAR-CaCO3.

Key words: CaCO3 deposition    Orbital period    Circulation system    Site ODP 1170    Southern Ocean
收稿日期: 2013-01-16 出版日期: 2013-02-10
:  P736.21  
基金资助:

南北极环境综合考察与评估专项“2013年度南极周边海域海洋地质考察”(编号:CHINARE2013-01-02)和“2013南极环境综合分析与评价”(编号:CHINARE-2013-04-01);中国地质调查局项目“应对全球气候变化地质研究”(编号:12120113006200)资助.

通讯作者: 王汝建(1959-),男,云南昆明人,教授,主要从事海洋地质学、古海洋学与古气候学研究.E-mail:rjwang@tongji.edu.cn     E-mail: rjwang@tongji.edu.cn
作者简介: 胡正莹(1986-),女,重庆人,硕士研究生,主要从事古海洋与古气候学研究.E-mail:blueyinger@sohu.com
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引用本文:

胡正莹,王汝建,李文宝. 南塔斯曼海隆2 Ma以来碳酸钙沉积记录及其对环流系统和轨道周期的响应[J]. 地球科学进展, 2013, 28(2): 269-281.

Hu Zhengying, Wang Rujian, Li Wenbao. A CaCO3 Deposition Record During the Last 2 Ma in Southern Tasman Rise of Southern Ocean and Its Responses to the Circulation System and Orbital Cycles. Advances in Earth Science, 2013, 28(2): 269-281.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2013.02.0269        http://www.adearth.ac.cn/CN/Y2013/V28/I2/269

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