浙江煤山牙形石微区原位REE组成及古环境意义

陈剑波; 赵来时; 陈中强; 童金南; 周炼; 胡兆初; 陈泳霖

doi:10.3799/dqkx.2012.003

浙江煤山牙形石微区原位REE组成及古环境意义

doi: 10.3799/dqkx.2012.003

1.
中国地质大学地质过程与矿产资源国家重点实验室，湖北武汉 430074
2.
西澳大利亚大学地球与环境学院，西澳大利亚克劳利区 WA6009
3.
中国地质大学生物地质与环境地质国家重点实验室，湖北武汉 430074

基金项目:

国家自然科学基金 40972003

国家自然科学基金重点项目 90714010

国家自然科学基金创新研究群体项目 40621002

地质过程与矿产资源国家重点实验室科技部专项资金 MSFGPMR201010

地质过程与矿产资源国家重点实验室科技部专项资金 MSFGPMR201002

详细信息

作者简介:
陈剑波(1986-)，男，硕士，主要研究方向为生物地球化学

通讯作者:
赵来时，E-mail: lszhao@cug.edu.cn

中图分类号: Q911
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- 被引次数: 0
出版历程
- 收稿日期: 2011-03-25
- 刊出日期: 2012-01-15

In Situ Rare Earth Elements in Conodont from Meishan Section in Zhejiang Province and Implications for Paleoenvironmental Evolution

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
School of Earth & Environment, University of Western Australia, Crawley WA6009, Australia
3.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 本文利用激光剥蚀电感耦合等离子体质谱(LA-ICPMS)，对煤山D剖面包含二叠纪-三叠纪界线层的牙形石中色变指数(CAI)较低的部分进行微区原位微量元素分析，并与利用溶解法测定的相应的沉积碳酸盐岩围岩稀土元素(REE)的组成进行了对比，探讨了它们的稀土元素组成对环境变化响应的差异及其可能的原因.结果显示，无论是稀土总量ΣREE，还是Ce异常值，牙形石的微区原位REE信息比围岩更能反映出当时的环境变化.这表明牙形石化石比围岩对环境变化更加敏感，利用牙形石微区LA-ICPMS微量元素分析的方法是可靠的.同时，牙形石的Ce异常值还能对早三叠世的环境有较好的指示意义，为二叠纪与三叠纪之交大绝灭主幕开始到早三叠世环境的剧烈变化和长期缺氧环境提供了新的证据.
- 牙形石 /
- 微量元素 /
- LA-ICPMS /
- 煤山剖面 /
- 地球化学
Abstract: Trace elements and rare earth elements (REE) contents of conodonts, distinguished by very low color alteration index (CAI), were measured by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) from Meishan D section across the Permian-Triassic boundary in Zhejiang Province. Comparative analyses of surrounding rocks geochemistry study, using solutions, a significantly different response to paleo-environmental changes was revealed. Present data indicate both the total REE contents in conodont and the Ce anomalies demonstrate a more sensitive change towards temporal environmental evolution than those in whole rocks. Therefore, conodont elements are more sensitive to ambient variation than the surrounding rocks, and it is reliable for LA-ICPMS in situ analysis of conodonts. Meanwhile, we can reconstruct the Early Triassic environment using the Ce anomaly of conodont, and it provides a new evidence for acute evolutions and long-term anoxia conditions from the Permo-Triassic crisis to the Early Triassic.
- conodont /
- trace elements /
- LA-ICPMS /
- Meishan section /
- geochemistry

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图 1 煤山剖面采样位置及交通

Fig. 1. Geographic position and transportation of sampling at Meishan section

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图 2 LA-ICPMS对BCR-2G玻璃标准样品分析结果与参考值相对偏差对比(标样推荐值来自Gao et al., 2002)

Fig. 2. Relative deviation of average concentrations in BCR-2G obtained in this study by LA-ICPMS vs. the reference values

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图 3 煤山D剖面牙形石的(La/Yb)_N-(La/Sm)_N图

Fig. 3. (La/Yb)_N vs. (La/Sm)_N of conodonts from Meishan D section

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图 4 煤山D剖面牙形石(a)及其围岩稀土元素(b)配分曲线

Fig. 4. Normalized REE distribution patterns of conodonts (a) and their surrounding rocks (b) from Meishan D section

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图 5 煤山D剖面牙形石及其围岩的稀土总量ΣREE和Ce异常曲线

Fig. 5. ΣREE and Ce anomalies of conodonts and their surrounding rocks

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表 1 LA-ICPMS仪器工作参数

Table 1. Laser ablation and ICPMS operating conditions

激光剥蚀系统：GeoLas 2005	ICPMS: Agilent 7500a
波长：193 nm, Excimer laser	RF功率：1 350 W
脉冲宽度：15 ns	等离子体流速：14.0 L·min^-1
能量密度：10 J·cm^-2	辅助气流速：1. 0 L·min^-1
斑束直径：24 μm	采样深度：5.0 mm
频率：8 Hz	离子透镜设置：Typical
载气：氦气(0.70 L·min^-1)	积分时间：10 ms
补偿气：氩气(0.80 L·min^-1)	检测器模式：Dual

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表 2 煤山D剖面24~39层牙形石微量元素分析结果(10^-6)

Table 2. Analysed trace elements of conodonts at the beds 24-39 from Meishan D section

	MD24A	MD24B	MD24C	MD24D	MD24E	MD24E-2	MD24E-3	MD24E-4	MD25
Co	0.04	0.02	0.04	0.03	0.02	0.03	0.02	0.02	0.05
Ni	0.32	0.17	0.20	0.17	0.23	0.23	0.19	0.16	0.17
Cu	0.89	0.80	0.84	3.48	1.05	0.64	0.36	1.26	1.22
Zn	15.61	19.41	17.84	14.28	12.98	17.44	14.90	14.54	14.81
Rb	0.07	0.02	0.03	0.21	0.02	0.02	0.03	0.03	0.19
Sr	1142	1125	1110	1218	1229	1202	1162	1263	1234
Y	5.87	4.32	2.51	6.63	12.57	14.97	10.48	18.74	21.09
Ba	3.71	2.27	2.28	4.69	8.29	8.84	6.88	10.44	6.86
La	5.39	3.79	2.80	6.01	7.77	8.66	6.42	9.58	18.64
Ce	11.91	7.41	5.78	11.19	15.04	16.34	12.09	18.81	58.89
Pr	1.64	1.05	0.86	1.76	2.37	2.84	1.90	3.36	10.09
Nd	7.36	4.81	4.17	8.40	10.81	14.05	8.90	17.50	53.49
Sm	1.65	1.07	0.99	2.13	3.17	4.22	2.67	5.20	16.15
Eu	0.36	0.21	0.20	0.52	0.93	1.19	0.92	1.46	2.18
Gd	1.72	1.12	0.98	2.14	3.31	4.65	2.86	5.88	14.42
Tb	0.20	0.13	0.12	0.26	0.45	0.59	0.36	0.75	1.75
Dy	1.07	0.67	0.48	1.28	2.10	2.90	2.00	3.55	6.99
Ho	0.14	0.11	0.07	0.20	0.36	0.43	0.28	0.55	0.82
Er	0.27	0.25	0.12	0.34	0.68	0.83	0.56	0.97	1.34
Tm	0.02	0.03	0.01	0.04	0.04	0.07	0.05	0.07	0.12
Yb	0.12	0.08	0.06	0.09	0.17	0.26	0.21	0.24	0.49
Lu	0.01	0.00	0.01	0.01	0.03	0.03	0.02	0.03	0.05
Pb	0.24	0.21	0.48	0.86	0.81	0.72	0.30	1.99	0.33
Th	0.10	0.08	0.61	0.17	0.21	0.31	0.24	0.61	2.46
U	0.74	0.70	0.17	0.45	0.40	0.53	0.31	0.78	0.09
ΣREE	31.9	20.7	16.7	34.4	47.2	57.1	39.3	68.0	185.4
Ce/Ce^*	0.92	0.83	0.83	0.77	0.80	0.74	0.78	0.74	1.02
Ω(Ce)	-0.08	-0.17	-0.17	-0.23	-0.20	-0.26	-0.22	-0.26	0.02
Eu/Eu^*	0.97	0.88	0.91	1.12	1.31	1.23	1.53	1.21	0.66
(La/Sm)_N	0.63	0.68	0.54	0.54	0.47	0.39	0.46	0.35	0.22
(La/Yb)_N	4.42	4.86	4.83	6.53	4.49	3.37	3.00	4.01	3.80
(Sm/Yb)_N	7.05	7.15	8.89	12.02	9.53	8.54	6.49	11.32	17.11
Th/La	0.02	0.02	0.22	0.03	0.03	0.04	0.04	0.06	0.13

	MD26	MD27A	MD27A-2	MD27B	MD27C	MD27D	MD28	MD28-2	MD29
Co	0.03	0.03	0.08	0.02	0.02	0.03	0.02	0.02	0.02
Ni	0.44	0.22	0.76	0.16	0.17	1.01	0.20	0.18	0.19
Cu	7.08	0.69	5.57	1.36	0.25	3.93	1.26	0.21	2.55
Zn	26.57	22.61	36.58	25.22	14.58	47.53	23.46	26.01	20.02
Rb	0.13	0.03	0.19	0.23	0.03	0.16	0.04	0.08	0.03
Sr	1206	2057	990	1009	3300	3431	1387	2834	1269
Y	31.66	6.43	2.65	17.67	6.04	17.81	43.80	13.26	24.51
Ba	2.13	6.09	2.21	11.05	22.71	13.08	9.71	12.12	9.21
La	33.24	5.14	3.63	16.49	3.12	8.88	34.15	5.17	27.43
Ce	110.08	17.47	13.52	48.78	10.60	33.65	113.74	18.08	63.58
Pr	19.56	3.25	2.17	9.44	2.22	7.24	21.77	3.90	9.10
Nd	86.35	17.20	8.82	45.08	13.06	41.87	115.38	21.72	42.65
Sm	24.72	4.97	2.53	11.93	4.16	13.98	29.81	7.18	12.58
Eu	3.76	0.70	0.37	2.34	0.63	2.37	5.25	1.25	2.08
Gd	18.04	4.09	1.68	10.16	3.82	12.02	25.18	6.41	13.21
Tb	2.36	0.44	0.26	1.11	0.37	1.22	2.70	0.68	1.40
Dy	9.39	1.73	1.22	4.41	1.36	4.61	10.38	2.63	5.66
Ho	1.21	0.23	0.16	0.61	0.19	0.63	1.39	0.41	0.78
Er	2.22	0.29	0.33	1.02	0.30	0.94	2.32	0.72	1.38
Tm	0.24	0.03	0.04	0.10	0.03	0.08	0.21	0.07	0.13
Yb	1.13	0.13	0.20	0.43	0.14	0.28	0.80	0.28	0.63
Lu	0.12	0.01	0.02	0.06	0.01	0.03	0.07	0.03	0.06
Pb	149.56	0.26	322.16	14.84	0.27	1.28	0.38	0.43	0.32
Th	2.16	3.13	15.48	5.48	2.31	3.89	0.32	9.45	0.35
U	0.12	0.08	0.05	0.12	0.07	0.14	0.36	0.48	0.18
ΣREE	312.4	55.7	35.0	152.0	40.0	127.8	363.2	68.5	180.7
Ce/Ce^*	1.11	1.05	1.28	0.97	0.97	1.04	1.02	1.00	0.92
Ω(Ce)	0.11	0.05	0.28	-0.03	-0.03	0.04	0.02	0.00	-0.08
Eu/Eu^*	0.82	0.72	0.82	0.98	0.73	0.84	0.88	0.85	0.74
(La/Sm)_N	0.26	0.20	0.28	0.27	0.14	0.12	0.22	0.14	0.42
(La/Yb)_N	2.95	3.86	1.79	3.85	2.18	3.16	4.26	1.87	4.34
(Sm/Yb)_N	11.43	19.43	6.48	14.50	15.13	25.87	19.33	13.53	10.35
Th/La	0.07	0.61	4.26	0.33	0.74	0.44	0.01	1.83	0.01

	MD29-1	MD29-2	MD30-1	MD33-3	MD34-2	MD35	MD36	MD38-1	MD39-2
Co	0.03	0.03	0.08	0.02	0.03	0.03	0.03	0.02	0.03
Ni	0.31	0.17	0.81	0.15	0.21	0.19	0.80	0.16	0.17
Cu	1.05	3.33	7.90	2.98	0.62	0.41	3.93	0.25	2.23
Zn	35.89	24.06	45.30	34.35	23.52	20.87	35.53	19.47	40.45
Rb	0.03	0.06	0.35	0.05	0.06	0.02	0.11	0.02	0.06
Sr	1147	1201	982	3820	1982	1734	3168	1713	2677
Y	31.81	22.46	5.31	9.36	19.16	8.54	10.17	16.65	8.97
Ba	6.89	7.54	11.41	14.17	7.17	18.74	52.63	10.37	5.13
La	20.42	23.40	3.86	2.63	4.86	1.42	2.52	4.26	0.88
Ce	51.65	55.31	19.13	14.20	28.41	9.90	17.08	27.41	7.56
Pr	7.73	8.11	3.53	3.60	7.37	2.89	4.23	7.59	2.03
Nd	39.75	40.00	17.87	24.12	50.23	23.07	29.83	51.85	17.97
Sm	15.44	11.39	5.31	9.69	17.24	9.22	13.23	18.48	9.48
Eu	2.92	1.82	0.90	1.55	2.57	1.59	2.07	2.97	1.82
Gd	17.04	11.61	3.88	7.31	14.53	7.40	9.26	14.70	7.76
Tb	2.05	1.31	0.51	0.79	1.52	0.75	1.03	1.52	0.74
Dy	8.33	5.45	1.94	2.90	5.44	2.55	3.80	5.02	2.63
Ho	1.11	0.73	0.25	0.33	0.68	0.30	0.40	0.57	0.33
Er	1.93	1.31	0.44	0.59	0.98	0.42	0.67	0.72	0.44
Tm	0.16	0.13	0.04	0.05	0.07	0.03	0.07	0.06	0.03
Yb	0.80	0.57	0.23	0.26	0.28	0.13	0.32	0.21	0.14
Lu	0.07	0.05	0.03	0.03	0.03	0.01	0.03	0.02	0.01
Pb	1.02	0.50	198.96	9.14	0.07	0.09	115.07	0.19	0.11
Th	27.55	0.49	34.17	5.35	1.74	0.45	13.10	0.50	3.82
U	0.80	0.20	0.05	0.04	0.04	0.02	0.02	0.01	0.03
ΣREE	169.4	161.2	57.9	68.1	134.2	59.7	84.5	135.4	51.8
Ce/Ce^*	0.93	0.91	1.37	1.19	1.24	1.27	1.37	1.29	1.45
Ω(Ce)	-0.07	-0.09	0.37	0.19	0.24	0.27	0.37	0.29	0.45
Eu/Eu^*	0.83	0.72	0.91	0.84	0.74	0.88	0.86	0.83	0.97
(La/Sm)_N	0.25	0.40	0.14	0.05	0.05	0.03	0.04	0.04	0.02
(La/Yb)_N	2.55	4.11	1.67	1.00	1.71	1.13	0.80	2.01	0.63
(Sm/Yb)_N	10.02	10.41	11.95	19.16	31.57	38.06	21.77	45.33	35.22
Th/La	1.35	0.02	8.85	2.03	0.36	0.32	5.20	0.12	4.33

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