印尼海区浮游有孔虫壳体Mg/Ca值的LA-ICP-MS原位微区分析

doi:10.11867/j.issn.1001-8166.2016.05.0494.

地球科学进展 ›› 2016, Vol. 31 ›› Issue (5): 494 -502. doi: 10.11867/j.issn.1001-8166.2016.05.0494.

张鹏 ^1, ²(

), 袁洪林 ², 徐建 ^1, ^2,,A; ^*(

), 高莲凤 ⁴, 张振国 ⁴, 杨策 ^1, ²

1.西北大学地质学系新生代地质与环境研究所, 陕西西安 710069
2.西北大学大陆动力学国家重点实验室, 陕西西安 710069
3. Marine Geology Institute, Bandung 40174, Indonesia
4.华北理工大学矿业工程学院,河北唐山 063009

收稿日期:2016-03-07 修回日期:2016-04-30 出版日期:2016-05-20
通讯作者: 徐建 E-mail:zp13@foxmail.com;jx08@live.cn
基金资助:
*国家自然科学基金面上项目“低纬海区有孔虫壳体Mg/Ca特征及对古温度重建的应用”(编号: 41176044)资助

In-situ Microanalysis of Mg/Ca Ratio in Planktonic Foraminiferal Shells from the Indonesian Seas

Peng Zhang ^1, ², Zuraida Rina ³, Honglin Yuan ², Jian Xu ^1, ^2, ^*( ), Lianfeng Gao ⁴, Zhenguo Zhang ⁴, Ce Yang ^1, ²

1. Institute of Cenozoic Geology and Environment, Department of Geology, Northwest University, Xi’an 710069, China
2.State Key Laboratory of Continental Dynamics and Department of Geology,Northwest University,Xi’an 710069,China
3.Marine Geology Institute, Bandung 40174, Indonesia
4.School of Mining Engineering, North China University of Science and Technology, Tangshan 063009, China

Received:2016-03-07 Revised:2016-04-30 Online:2016-05-20 Published:2016-05-10
Contact: Jian Xu E-mail:zp13@foxmail.com;jx08@live.cn
About author:
First author:Zhang Peng(1987-), male, Qinyang City, He’nan Province,PH.D student. Research areas include marine micropaleontology and paleoceanography.E-mail:zp13@foxmail.com

Corresponding author:Xu Jian(1977-), male, Xinyi City, Jiangsu Province, Professor. Research areas include paleooceanography and quaternary geology.E-mail:jx08@live.cn
Supported by:
Project supported by the National Natural Science Foundation of China “Characteristics of Mg/Ca in foraminiferal tests from low-latitude seas and their implications in paleo-ocean temperature reconstruction” (No.41176044)

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激光剥蚀电感耦合等离子质谱仪(Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer, LA-ICP-MS)为更详细地探索微量元素在有孔虫方解石壳体中的分布提供了可能,也为有孔虫壳体Mg/Ca值测试提供了一种新的方法。利用LA-ICP-MS技术对擭取自印尼海区的11个钻孔顶部沉积样品中的多枚Globigerinoides ruber壳体进行了共173点位的激光剥蚀Mg/Ca值原位微区和深度分析,发现不同壳体、同一壳体不同房室以及同一房室不同部位之间,从壳壁外部到内部Mg/Ca值的变化是不同的。随后,将利用LA-ICP-MS获得的Mg/Ca值与利用常规测试手段获得的Mg/Ca值进行对比,结果表明利用LA-ICP-MS测试浮游有孔虫壳体Mg/Ca值,不但可以避免常规测试复杂的前处理过程,减少化学药品对实验人员健康的危害,也具有较好的准确度和可靠性。

关键词: Mg/Ca比值, 原位微区深度分析, LA-ICP-MS, Globigerinoides ruber壳体, 印尼海区

Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer (LA-ICP-MS) provides an opportunity for us to perform in-situ microanalysis for depth profiling of elements and trace elements/Calcium ratios in calcite foraminiferal shells. In this study, Globigerinoides ruber shells were investigated with a total of 173 ablating positions from a total of 11 core top sediment samples that retrieved from the Indonesian Seas. The results showed changing compositions of Magnesium and Calcium from the inside to the outside surface for both of intra-test and inter-test. Subsequently, Mg/Ca ratios from the LA-ICP-MS microanalysis were compared with Mg/Ca ratios based on regular analyses, suggesting that LA-ICP-MS microanalysis may provide a comparatively safe and convenient way for investigating Mg/Ca ratio of planktonic foraminiferal shells with considerable reliability and accuracy.

Key words: Mg/Ca ratio, In-situ micro- and depth profiling- analysis, LA-ICP-MS, Globigerinoides ruber shells, Indonesian Seas.

中图分类号:

P736.22+1

图1 研究区现代表层海水温度分布 ^{[

20
]}以及钻孔站位图
图件通过Ocean Data View软件 ^{[

21
]}制作,图中蓝色五角星代表钻孔位置

Fig.1 Location of the coring sites and distribution of annual mean sea surface temperatures ^{[

20
]} in the studied region
This figure was plotted using the Ocean Data View software ^{[

21
]}, the blue stars mark the coring sites in this study

图2 壳体S1,S2和S3中,不同位置的Mg/Ca深度分析结果
S“X”-“Y”-“Z”代表壳体SX中的第Y个房室的第Z个深度分析位置,如S1-1-1代表壳体S1中第1个房室的第1个深度分析位置。对于壳体S2和S3原则同上

Fig.2 Depth profiling analysis for Mg/Ca ratios in Shells S1, S2 and S3
S“X”-“Y”-“Z” represents the “Z”th depth profiling analysis located in the “Y”th chamber for Shell SX, for instance, S1-1-1 represents the first depth profiling analysis located in the first chamber for Shell S1. Detailed descriptions are similar to Shell S1 for Shell S2 and S3

图3 浮游有孔虫 G. ruber壳体剖面电镜扫描图
黑色箭头所指的为壳体中出现的“夹层”

Fig.3 Scanning of cross section of G. ruber shells
The black arrows point to the ‘sandwich’ layers

表1 壳体S1,S2和S3中不同部位的Mg/Ca值

Table 1 Mg/Ca ratios at various parts in shells S1, S2 and S3

壳体S1	Mg/Ca/ (mmol/mol)	壳体S2	Mg/Ca/ (mmol/mol)	壳体S3	Mg/Ca/ (mmol/mol)
S1-1-1	7.80	S2-1-1	6.26	S3-1-1	4.78
S1-1-2	6.84	S2-1-2	6.22	S3-1-2	4.55
S1-1-3	5.84	S2-2-1	5.95	S3-1-3	4.73
S1-2-1	8.00	S2-2-2	4.43	S3-1-4	4.98
S1-2-2	6.37	S2-2-3	4.94	S3-2-1	5.30
S1-2-3	7.00	S2-2-4	4.63	S3-2-2	5.33
S1-2-4	6.03	S2-3-1	3.90	S3-2-3	5.20
S1-3-1	5.90	S2-3-2	3.65	S3-2-4	5.31
S1-3-2	5.25	S2-3-3	3.50	S3-3-1	5.42
S1-3-3	4.60	S2-3-4	4.08	S3-3-2	4.81
S1-3-4	6.61			S3-3-3	4.36
S1-3-5	6.04			S3-3-4	4.82

表1 壳体S1,S2和S3中不同部位的Mg/Ca值

Table 1 Mg/Ca ratios at various parts in shells S1, S2 and S3

壳体S1	Mg/Ca/ (mmol/mol)	壳体S2	Mg/Ca/ (mmol/mol)	壳体S3	Mg/Ca/ (mmol/mol)
S1-1-1	7.80	S2-1-1	6.26	S3-1-1	4.78
S1-1-2	6.84	S2-1-2	6.22	S3-1-2	4.55
S1-1-3	5.84	S2-2-1	5.95	S3-1-3	4.73
S1-2-1	8.00	S2-2-2	4.43	S3-1-4	4.98
S1-2-2	6.37	S2-2-3	4.94	S3-2-1	5.30
S1-2-3	7.00	S2-2-4	4.63	S3-2-2	5.33
S1-2-4	6.03	S2-3-1	3.90	S3-2-3	5.20
S1-3-1	5.90	S2-3-2	3.65	S3-2-4	5.31
S1-3-2	5.25	S2-3-3	3.50	S3-3-1	5.42
S1-3-3	4.60	S2-3-4	4.08	S3-3-2	4.81
S1-3-4	6.61			S3-3-3	4.36
S1-3-5	6.04			S3-3-4	4.82

表2 不同钻孔顶部沉积样品中 G. ruber壳体的Mg/Ca值

Table 2 Mg/Ca ratios of G. ruber from different core-top samples

站位	壳体个数 /个	激光剥蚀点数 /个	LA-ICP-MS测得的Mg/Ca平均值 /(mmol/mol)	标准偏差 /(mmol/mol)	ICP-AES测得的Mg/Ca值 /(mmol/mol)
GM3-1910-22	6	22	5.27	0.72	5.23
GM3-20214-14	5	21	5.18	0.55	5.16
GM3-20214-05	4	13	5.22	0.49	5.17
BJ8-03-138D	5	18	5.12	0.47	5.11
SO18518	4	15	5.21	0.33	5.18
BJ8-03-16	3	5	5.29	0.20	5.10
BJ8-03-88	4	11	5.20	0.47	5.00
GM3-20214-01	5	15	5.39	0.59	5.35
SO18534	4	13	4.87	0.66	4.78
BJ8-03-67	3	6	5.34	0.20	5.34

表2 不同钻孔顶部沉积样品中 G. ruber壳体的Mg/Ca值

Table 2 Mg/Ca ratios of G. ruber from different core-top samples

站位	壳体个数 /个	激光剥蚀点数 /个	LA-ICP-MS测得的Mg/Ca平均值 /(mmol/mol)	标准偏差 /(mmol/mol)	ICP-AES测得的Mg/Ca值 /(mmol/mol)
GM3-1910-22	6	22	5.27	0.72	5.23
GM3-20214-14	5	21	5.18	0.55	5.16
GM3-20214-05	4	13	5.22	0.49	5.17
BJ8-03-138D	5	18	5.12	0.47	5.11
SO18518	4	15	5.21	0.33	5.18
BJ8-03-16	3	5	5.29	0.20	5.10
BJ8-03-88	4	11	5.20	0.47	5.00
GM3-20214-01	5	15	5.39	0.59	5.35
SO18534	4	13	4.87	0.66	4.78
BJ8-03-67	3	6	5.34	0.20	5.34

图4 LA-ICP-MS与常规方法测得的 G. ruber壳体的Mg/Ca值对比

Fig.4 Comparison of Mg/Ca ratios of G. ruber from LA-ICP-MS and regular method

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