南海天然气水合物分解的碳同位素证据

王淑红; 颜文; 陈忠; 陈木宏; 宋海斌

doi:10.3799/dqkx.2010.068

南海天然气水合物分解的碳同位素证据

doi: 10.3799/dqkx.2010.068

王淑红^{1, 2,},
颜文^{1, 2},
陈忠^{1, 2},
陈木宏¹,
宋海斌^{2, 3}

1.
中国科学院边缘海地质重点实验室, 中国科学院南海海洋研究所, 广东广州 510301
2.
中国科学院广州天然气水合物研究中心, 广东广州 510640
3.
中国科学院地质与地球物理研究所, 北京 100029

基金项目:

国家自然科学基金 40676043

国家自然科学基金 40706022

中国科学院边缘海地质重点实验室基金 MSGL0703

国家自然科学基金-广东联合基金 U0733003

中国科学院知识创新工程重要方向项目 KZCX2-YW-211

详细信息

作者简介:
王淑红, 女(1977-), 副研究员, 海洋地质学专业, 从事海洋天然气水合物研究.E-mail: wshhsbq@scsio.ac.cn

中图分类号: P618.13
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出版历程
- 收稿日期: 2009-10-15
- 刊出日期: 2010-07-01

Carbon Isotope Evidence of Gas Hydrate Dissociation in South China Sea

WANG Shu-hong^{1, 2
,},
YAN Wen^{1, 2},
CHEN Zhong^{1, 2},
CHEN Mu-hong¹,
SONG Hai-bin^{2, 3}

1.
CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China
3.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

摘要

摘要: 通过南海南部NS93-5和NS97-37两个柱状沉积物的高分辨率碳、氧同位素分析发现, 末次冰消期(约18 ka)和倒数第二次冰消期(约130 ka)记录到了碳同位素的快速负偏移现象, 与此同时, 氧同位素也发生了明显的快速负偏移, 气温快速回升, 并在氧同位素5期与6期过渡中点(约129.84 ka)出现粉红色红拟抱球虫灭绝现象, 而且两柱样碳、氧同位素的变化趋势与Vostok冰心记录到的大气甲烷含量的变化基本一致.分析认为, 南海记录到的最近2个冰期结束时的碳同位素快速负偏移很可能与天然气水合物的分解释放有关, 即外界温压条件的变化可能导致了南海和/或其他地区海底天然气水合物的失稳分解并释放甲烷, 从而使气候快速变暖、导致海洋缺氧和某些生物种类的灭绝, 同时也加快了冰期的终止.
- 南海 /
- 天然气水合物 /
- 碳同位素
Abstract: High-resolution carbon and oxygen isotope analysis for cores NS93-5 and NS97-37 from southern South China Sea (SCS) shows the rapid negative excursion of carbon isotope in the last deglaciation (about 18 ka) and the penultimate deglaciation (about 130 ka). In the same layer, the oxygen isotope also displays similar phenomena. It is found that the Globigerinoides rubber (Pink) died out in midpoint of MIS 5/6 (about 129.84 ka). The change of carbon and oxygen isotope is in consonance with atmospheric methane concentration from the Vostok ice core. The two rapid negative excursions of carbon isotope recorded in SCS are likely related to gas hydrate dissociation, i.e. the changes of temperature and pressure induced gas hydrate dissociation and released methane in SCS and/or other areas, which made the climate warmer, ocean anoxic and further led to the extinction of some marine organism and accelerated glacial termination.
- South China Sea /
- gas hydrates /
- carbon isotope

HTML全文

图 1 NS93-5柱和NS97-37柱取样站位

Fig. 1. Cores NS93-5 and NS97-37 sampling position

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图 2 NS93-5及NS97-37柱样碳、氧同位素组成及其与其他资料(Prokopenko and Williams, 2004)的对比

Fig. 2. Carbon and oxygen isotope composition of cores NS93-5 and NS97-37 and the comparison with other data

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