赤道西太平洋翁通爪哇海台西南部25万年以来的火山活动: 来自沉积物元素地球化学的证据

路波; 李铁刚; 于心科; 常凤鸣; 南青云; 仇晓华

doi:10.3799/dqkx.2012.S1.012

赤道西太平洋翁通爪哇海台西南部25万年以来的火山活动: 来自沉积物元素地球化学的证据

doi: 10.3799/dqkx.2012.S1.012

路波^{1, 2, 3},
李铁刚^1, ,,
于心科¹,
常凤鸣¹,
南青云¹,
仇晓华^{1, 2}

1.
中国科学院海洋研究所海洋地质与环境重点实验室, 山东青岛 266071
2.
中国科学院研究生院, 北京 100049
3.
国家海洋环境监测中心, 辽宁大连 116023

基金项目:

国家重点基础研究发展计划973项目 2007CB815903

中国科学院知识创新工程 KZCX2-YW-221

中国科学院海洋研究所知识创新工程青年人才领域前沿项目 2007-10

国家自然科学基金青年科学基金项目 40906038

海洋地质国家重点实验室开放基金 MG0903

详细信息

作者简介:
路波(1982-), 男, 博士, 海洋地质学专业

通讯作者:
李铁刚, E-mail: tgli@ms.qdio.ac.cn

中图分类号: P736.2;P595
计量
- 文章访问数: 513
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- PDF下载量: 10
- 被引次数: 0
出版历程
- 收稿日期: 2011-08-28
- 网络出版日期: 2021-11-15
- 刊出日期: 2012-05-01

Past 250 ka Volcanic Activities in Southwest Ontong Java Plateau, West Equatorial Pacific: Evidences from Element Geochemistry

LU Bo^{1, 2, 3},
LI Tie-gang^{1
, ,},
YU Xin-ke¹,
CHANG Feng-ming¹,
NAN Qing-yun¹,
QIU Xiao-hua^{1, 2}

1.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
Graduate University of Chinese Academy of Sciences, Beijing 100049, China
3.
National Marine Environmental Monitoring Center, Dalian 116023, China

摘要

摘要: 赤道西太平洋作为全球变化关键海区, 其沉积物组成对揭示古海洋、古环境变化具有重要意义.本文利用元素地球化学分析方法, 对赤道西太平洋翁通爪哇海台WP7站位(3°56'S, 156°00'E)柱状沉积物进行了研究.结果显示元素Al、Na、K、Be、Ga、Rb、Zr、Nb、Cs、Ce、Hf、Ta、Th、Fe和Mg经Ti标准化后, 无法用单独的碎屑物质来源解释, 而是分别同偏酸性和偏基性火山灰相关, 指示了249.5 ka以来, 共发生了4次偏酸性火山灰输入(2.5~6.4 ka、57.0~61.2 ka、79.7~88.4 ka和193.7~249.5 ka)和4次偏基性火山灰输入(19.8~24.4 ka、50.0~62.6 ka、143.2~150.5 ka和160.8~171.1 ka).火山灰的输入使沉积物元素地球化学组成发生了相应变化, 也使沉积物中碳酸钙产生了稀释效应, 从而沉积物颜色相应加深, 沉积速率显著提高.
- 元素 /
- 地球化学 /
- 火山灰 /
- 沉积物 /
- 赤道西太平洋 /
- 翁通爪哇海台
Abstract: West equatorial Pacific is the key area of global change, and are important to paleo-ocean and paleo-environment reconstruction. Based on elements geochemistry of sediments of core WP7, recovered from southwest Ontong Java plateau, 4 acidic tephra inputs (2.5-6.4 ka, 57.0-61.2 ka, 79.7-88.4 ka, and 193.7-249.5 ka) and 4 mafic tephra inputs (19.8-24.4 ka, 50.0-62.6 ka, 143.2-150.5 ka, and 160.8-171.1 ka) were deciphered after normalization of Al, Na, K, Be, Ga, Rb, Zr, Nb, Cs, Ce, Hf, Ta, Th, Fe and Mg to Ti. The input of tephra changed the sediment constituents, diluted the biotic CaCO₃, darkened the sediment color, and raised the sedimentation rate.
- elements /
- geochemistry /
- tephra /
- sediments /
- west equatorial Pacific /
- Ontong Java plateau

HTML全文

图 1 赤道西太平洋翁通爪哇海台附近地形及WP7站位(3°56′S，156°00′E)

水深据GEBCO(http://www.gebco.net/)；构造特征据Hall(2002)；底图通过gridview软件制作(https://www.bodc.ac.uk/products/software_products/gebco_grid_display/)

Fig. 1. Bathymetry of Ontong Java plateau and nearby area in west equatorial Pacific, and location of core WP7 (3°56′S, 156°00′E)

下载: 全尺寸图片幻灯片

图 2 WP7站位年龄框架

箭头为AMS ¹⁴C测年点，据Li et al.(2011)；菱形为G. ruber(pink)末现面，据李铁刚等(2008)

Fig. 2. WP7 age frame

下载: 全尺寸图片幻灯片

图 3 WP7站位偏酸性火山物质相关元素与Ti比值

竖线表示PAAS(Taylor and McLennan, 1985)中元素与Ti比值

Fig. 3. The content ratio of acidic tephra related elements and some magor elements to element Ti in core WP7

下载: 全尺寸图片幻灯片

图 4 WP7站位偏基性火山物质相关元素与Ti比值

竖线表示PAAS(Taylor and McLennan, 1985)中元素与Ti比值

Fig. 4. The content ratio of acidic tephra related elements and CaCO₃ to element Ti in core WP7

下载: 全尺寸图片幻灯片

图 5 WP7岩心沉积物中的火山玻璃

Fig. 5. Volcanic glasses in core WP7

下载: 全尺寸图片幻灯片

图 6 WP7站位火山灰存在的证据

Fig. 6. Evidence of tephra existence in core WP7

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表 1 WP7沉积物元素分析方法精确度

Table 1. Precision of element content analysis in core WP7

元素	测量次数	最大值	最小值	平均值	标准偏差	相对标准偏差
TiO₂(%)	19	0.2	0.2	0.2	0.0	5.7
Al₂O₃(%)	19	7.8	6.2	7.1	0.4	5.7
K₂O(%)	19	1.4	1.1	1.3	0.1	6.2
Na₂O(%)	19	2.9	2.2	2.6	0.2	6.5
TFe₂O₃(%)	19	2.2	1.8	2.0	0.1	5.9
MgO(%)	19	1.0	0.8	0.9	0.1	5.6
Be(μg/g)	19	0.6	0.4	0.5	0.1	12.1
Ga(μg/g)	19	8.6	7.2	8.1	0.4	4.7
Rb(μg/g)	19	22.8	18.7	21.2	1.0	4.9
Zr(μg/g)	19	41.9	34.4	39.3	2.2	5.7
Nb(μg/g)	19	3.0	2.4	2.8	0.1	5.2
Cs(μg/g)	19	0.6	0.5	0.6	0.0	4.8
Ce(μg/g)	19	13.0	10.8	12.1	0.5	4.2
Hf(μg/g)	19	1.2	1.0	1.1	0.1	5.0
Ta(μg/g)	19	0.2	0.2	0.2	0.0	5.7
Th(μg/g)	19	1.0	0.9	1.0	0.0	4.1

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