林震^1,2,
易亮³,
王海峰⁴,
邓希光⁴,
杨继超⁵,
付腾飞⁶,
于洪军⁵,
谢强¹,
邓成龙^2,7,8,,
1. 中国科学院深海科学与工程研究所, 海南三亚 572000
2. 中国科学院大学, 北京 100049
3. 同济大学海洋与地球科学学院, 海洋地质国家重点实验室, 上海 200092
4. 广州海洋地质调查局, 自然资源部海底矿产资源重点实验室, 广州 510075
5. 国家深海基地管理中心, 山东青岛 266237
6. 自然资源部第一海洋研究所, 自然资源部海洋沉积与环境地质重点实验室, 山东青岛 266061
7. 中国科学院地质与地球物理研究所, 岩石圈演化国家重点实验室, 北京 100029
8. 中国科学院地球科学研究院, 北京 100029

基金项目: 国际海域资源调查与开发"十三五"（DY135-E2-1-01，DY135-C1-1-07），中科院战略性先导科技专项《蛟龙号7000m级海试区地形特征与沉积物古海洋环境研究》（XDB06020206，XDB06020101）和国家自然科学基金（41690112）联合资助


详细信息

作者简介: 林震, 男, 博士研究生, 主要从事海洋地质学研究

通讯作者: 邓成龙, 男, 研究员, 主要从事古地磁学研究.E-mail:cldeng@mail.iggcas.ac.cn

中图分类号: P318

收稿日期:2018-08-30
修回日期:2019-03-20
上线日期:2019-08-05

Rock magnetism of deep-sea sediments at Caiwei Guyot, Magellan seamounts of Northwest Pacific and its significance to abyssal environmental changes

LIN Zhen^1,2,
YI Liang³,
WANG HaiFeng⁴,
DENG XiGuang⁴,
YANG JiChao⁵,
FU TengFei⁶,
YU HongJun⁵,
XIE Qiang¹,
DENG ChengLong^2,7,8,,
1. Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya Hainan 572000, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
4. MNR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510640, China
5. National Deep Sea Center of China, Qingdao Shandong 266061, China
6. MNR Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao Shandong 266061, China
7. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
8. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China


More Information

Corresponding author: DENG ChengLong,E-mail:cldeng@mail.iggcas.ac.cn

MSC: P318

--> Received Date: 30 August 2018
Revised Date: 20 March 2019
Available Online: 05 August 2019


摘要
摘要:采薇海山位于西北太平洋麦哲伦海山区，是由中国发现、命名并负责资源勘探的重点调查区之一.本文利用大洋27航次在采薇海山北坡MABC-05站获得的箱式沉积物样品，开展了详细的岩石磁学研究.结果显示表层沉积物中的磁性矿物以颗粒较细的、矫顽力较低的磁铁矿为主；利用对数正态分布函数可以区分三个具有不同矫顽力值的磁性颗粒组分，并发现磁性颗粒的矫顽力值变化可以有效指示沉积物埋藏后的早期成岩特征.在参考现代物理海洋过程的基础上，我们推测南极底层水团的演化和太阳辐射的变化可能共同影响了采薇海山区海洋底层环境过程.这一结果为探讨南极气候状况对北太平洋的可能影响，评估海洋上层与底层的相互作用等重要科学问题提供了新途径.
关键词: 西北太平洋/
采薇海山/
岩石磁学/
早期成岩作用/
深海环境过程

Abstract:Seamounts constitute some of the most direct evidence about intraplate volcanism, and can profoundly affect physical and biological processes, mesoscale circulation and primary production. Caiwei Guyot locates within the Magellan Seamounts of the Northwest Pacific Ocean, where is one of the key investigation areas discovered, named and responsible for resource exploration by China. In this study, we carried out detailed rock magnetic investigations on a sedimentary sequence obtained from the Caiwei Guyot. The methods include hysteresis loops, isothermal remanent acquisition curves, and first-order reversal curves. It is found that the magnetic minerals in the surface sediments of the Caiwei Guyot are mainly fine-grained magnetite with low coercivity; and three magnetic sub-groups with different coercivity values can be mathematically distinguished by a log-normal distribution function, inferring that the change of the coercivity of the magnetic particles can effectively indicate the intensity of the early diagenesis of the sediments. Referring to the physical ocean process, we speculate that the production changes of the Antarctic bottom water and solar insolation may affect the environmental evolution of ocean bottom. Therefore, we suggest that this result provides new perspective to explore the possible impacts of the Antarctic climate on the North Pacific, and to assess the interactions between the upper and lower parts of the oceans, which both may have directly contributed to global changes.
Key words:Northwest Pacific/
Caiwei Guyot/
Rock magnetism/
Early diagenesis/
Deep-sea environmental changes



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