下扬子二叠系泥页岩稀土元素地球化学特征及地质意义

赵晨君; 康志宏; 侯阳红; 余旭东; 王恩博

doi:10.3799/dqkx.2019.274

下扬子二叠系泥页岩稀土元素地球化学特征及地质意义

doi: 10.3799/dqkx.2019.274

赵晨君^{1, 2, 3, ,},
康志宏^{1, 2, 3, ,},
侯阳红^{1, 2, 3},
余旭东^{1, 2, 3},
王恩博^{1, 2, 3}

1.
中国地质大学能源学院, 北京 100083
2.
中国地质大学页岩气勘查与评价自然资源部重点实验室, 北京 100083
3.
中国地质大学海相储层演化与油气富集教育部重点实验室, 北京 100083

基金项目:

中国地质调查项目 DD20160183

中国地质调查项目 DD20190085

详细信息

作者简介:
赵晨君(1995-), 男, 硕士研究生, 主要从事沉积学理论与应用方面的工作.ORCID:0000-0003-4843-4062.E-mail:zcj74520@163.com

通讯作者:
康志宏, E-mail:kangzh98@163.com

中图分类号: P59
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出版历程
- 收稿日期: 2019-11-18
- 刊出日期: 2020-11-15

Geochemical Characteristics of Rare Earth Elements and Their Geological Significance of Permian Shales in Lower Yangtze Area

Zhao Chenjun^{1, 2, 3
,
,},
Kang Zhihong^{1, 2, 3
, ,},
Hou Yanghong^{1, 2, 3},
Yu Xudong^{1, 2, 3},
Wang Enbo^{1, 2, 3}

1.
School of Energy Resources, China University of Geosciences, Beijing 100083, China
2.
Key Laboratory for Shale Gas Exploitation and Assessment of Ministry of Natural Resources, China University of Geosciences, Beijing 100083, China
3.
Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism of Ministry of Education, China University of Geosciences, Beijing 100083, China

摘要

摘要: 为探讨下扬子地区二叠系泥页岩的稀土元素特征、物质来源及其地质意义，对研究区昌桥剖面大隆组、龙潭组和孤峰组的泥页岩样品进行了微量和稀土元素地球化学测试.测试结果表明该地区稀土元素（∑REE）含量较高，∑REE平均值为259.15 μg/g，轻稀土元素富集，重稀土元素亏损.稀土元素的配分曲线整体表现为“右倾”，Eu呈明显的负异常，Ce有轻微的负异常.样品的Ce_anom值（平均值为-0.07）和δCe值（平均值为0.90）反映了沉积时水体为缺氧的还原环境，有利于形成优质烃源岩，（La/Yb）_N值的变化反映研究区在垂向上的沉积速率为：大隆组 < 孤峰组 < 龙潭组.稀土元素数据还表明研究区物源来自上地壳，母岩为长英质岩石，以花岗岩为主.利用La-Th-Sc、Th-Sc-Zr/10、Th-Co-Zr/10三角图版和La/Th-Hf图解，判断得到研究区的构造背景为被动大陆边缘.
- 下扬子 /
- 二叠系 /
- 稀土元素 /
- 物源 /
- 氧化还原条件 /
- 构造背景 /
- 地球化学
Abstract: In order to find out the characteristics, provenance and geological significance of rare earth elements (REEs) in Permian shale in Lower Yangtze area, 16 samples collected from Dalong Formation, Longtan Formation and Gufeng Formation were selected for the trace and REE analyses. The results show that the REE distribution in research area is similar with upper crust, which is characterized by obvious "right-leaning" distribution pattern, with enrichment in LREE and depletion in HREE. In addition, Eu shows negative anomaly in a distinct "V" shape and Ce generally shows a slight negative anomaly based on REE curve. The characteristics of Ce_anom(-0.07) and δCe(0.90) indicate that the mudstone is deposited in an anoxic environment which is conductive to the formation of excellent source rock. The value of (La/Yb)_N reflects the vertical sedimentation rate in the study area as follows:Longtan Formation < Gufeng Formation < Dalong Formation. In the diagrams of La/Th-Hf and La/Yb-∑REE, it can be found that the parent rock is feldspathic-quartz, mainly intermediate to granite. By the comparison of REE characteristic parameters from graywackes in different settings, combined with La-Th-Sc, Th-Sc-Zr/10, Th-Co-Zr/10 triangle diagram, a conclusion can be drawn that the tectonic setting of the study area is determined to be a passive continental margin.
- Lower Yangtze area /
- Permian /
- rare earth element /
- provenance /
- tectonic setting /
- redox condition /
- geochemistry

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图 1 研究区剖面位置

据蔡周荣等(2015)和Du et al.（2015）修改

Fig. 1. Map showing the study area and locations of the section

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图 2 研究区昌桥剖面综合柱状图

Fig. 2. Comprehensive histogram of Changqiao Section in the study area

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图 3 昌桥剖面泥页岩地球化学参数垂向演化图

Fig. 3. Vertical distribution of mudstone geochemical parameters in Changqiao Section

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图 4 二叠系稀土元素配分模式及La/Yb-∑REE图解

底图据Allegre and Minster（1978）修改

Fig. 4. REE distribution patterns of mudstone and La/Yb-∑REE diagram

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图 5 研究区碎屑岩La-Th-Sc、Th-Sc-Zr/10和Th-Co-Zr/10构造背景判别图解

据Bhatia and Crook（1986）修改. OIA.大洋岛弧; CIA.大陆岛弧; ACM.活动大陆边缘; PM.被动大陆边缘

Fig. 5. The tectonic setting discrimination diagrams of clastic rocks according to La-Th-Sc、Th-Sc-Zr/10 and Th-Co-Zr/10 in the study area

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图 6 昌桥剖面二叠系泥页岩物源性质判别图

据Floyd and Leveridge（1987）修改

Fig. 6. Discrimination diagram for provenance attribute of Permian mud shale from Changqiao Section

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表 1 昌桥剖面稀土元素测试结果（μg/g）

Table 1. Rare earth element contents in Changqiao Section (μg/g)

地层	样品号	岩性	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
大隆组	P₂d-01	黑色泥岩	43.3	73.4	10.1	38.1	7.29	1.32	6.26	0.97	5.11	0.96	2.63	0.39	2.39	0.37
	P₂d-03	黑色泥岩	34.2	45.3	6.94	25.7	4.54	0.82	3.90	0.65	3.65	0.73	2.13	0.33	2.03	0.32
	P₂d-07	石煤	74.5	134	15.6	54.4	8.82	1.38	6.41	0.97	5.48	1.12	3.42	0.55	3.57	0.59
	P₂d-09	黑色泥岩	69.3	128	15.1	53.0	8.26	1.42	6.35	0.89	5.72	1.01	3.15	0.49	3.36	0.52
	P₂d-10	黑色泥岩	80.5	135	16.1	60.2	11.6	1.82	8.64	1.20	6.61	1.36	4.08	0.62	4.04	0.64
	P₂d-11	石煤	72.8	139	18.0	68.1	12.4	1.47	7.51	1.07	6.16	1.40	3.84	0.61	3.92	0.57
	P₂d-12	黑色泥岩	52.1	93.8	10.9	37.8	6.13	0.98	4.50	0.70	4.28	0.89	2.70	0.43	2.80	0.43
	P₂d-13	黑色泥岩	65.9	124	15.3	56.8	9.98	1.36	5.90	0.82	4.74	1.00	3.08	0.49	3.18	0.49
龙潭组	P₂l-05	黑色页岩	72.0	135	17.0	64.4	13.0	2.38	13.1	2.01	11.3	2.18	6.31	0.92	5.81	0.97
	P₂l-06	黑色页岩	50.9	91.1	10.7	37.1	6.30	1.20	5.07	0.84	5.03	1.05	3.14	0.49	3.21	0.51
	P₂l-07	黑色页岩	27.6	54.7	7.65	35.0	8.35	1.50	5.31	0.78	4.21	0.85	2.47	0.39	2.43	0.39
孤峰组	P₁g-04	灰黑色泥岩	56.5	106	12.6	46.1	8.59	1.66	7.38	1.11	5.91	1.17	3.38	0.52	3.32	0.55
	P₁g-06	灰黑色泥岩	58.2	110	13.1	48.6	9.19	1.78	7.78	1.17	6.45	1.27	3.69	0.57	3.63	0.59
	P₁g-08	灰黑色泥岩	59.0	111	13.2	48.9	9.24	1.81	7.90	1.21	6.66	1.31	3.79	0.57	3.70	0.61
	P₁g-10	灰黑色页岩	57.8	109	12.9	47.4	9.20	1.84	8.39	1.24	6.73	1.27	3.64	0.55	3.50	0.57
	P₁g-11	灰黑色页岩	58.8	110	13.2	49.0	9.03	1.69	7.43	1.12	6.20	1.24	3.61	0.56	3.58	0.59

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表 2 昌桥剖面微量元素测试结果（μg/g）

Table 2. Trace element contents in Changqiao Section (μg/g)

地层	样品号	岩性	Sc	Co	Zr	Th	Hf
大隆组	P₂d-01	黑色泥岩	10.6	8.97	104	15.4	3.46
	P₂d-03	黑色泥岩	8.01	6.23	73.9	9.62	2.49
	P₂d-07	石煤	13.6	4.67	222	19.2	7.00
	P₂d-09	黑色泥岩	13.0	3.09	223	16.5	6.60
	P₂d-10	黑色泥岩	15.4	2.61	284	20.2	7.84
	P₂d-11	石煤	13.1	3.87	220	19.3	6.99
	P₂d-12	黑色泥岩	9.71	2.15	223	18.0	7.05
	P₂d-13	黑色泥岩	10.5	1.38	219	19.4	6.81
龙潭组	P₂l-05	黑色页岩	18.9	4.27	193	25.1	6.17
	P₂l-06	黑色页岩	16.9	16.8	224	25.6	6.97
	P₂l-07	黑色页岩	15.8	15.9	211	19.4	6.32
孤峰组	P₁g-04	灰黑色泥岩	14.5	14.0	204	20.4	6.45
	P₁g-06	灰黑色泥岩	16.1	15.3	197	21.6	6.24
	P₁g-08	灰黑色泥岩	16.1	14.9	200	22.2	6.37
	P₁g-10	灰黑色页岩	15.4	15.0	200	21.8	6.45
	P₁g-11	灰黑色页岩	15.5	19.6	206	21.1	6.45

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表 3 昌桥剖面稀土元素地球化学特征

Table 3. The REE geochemical characteristics in Changqiao Section

地层	样品号	TOC（%）	∑REE（mg/g）	LREE（mg/g）	HREE（mg/g）	L/H	La_N/ Yb_N	La_N/ Sm_N	Gd_N/ Yb_N	δEu	δCe	La_n/ Yb_n	Ce_anom
大隆组	P₂d-01	0.15	192.59	173.51	19.08	9.09	12.24	3.74	2.12	0.60	0.82	1.76	-0.10
	P₂d-03	0.47	131.24	117.50	13.74	8.55	11.38	4.74	1.56	0.60	0.69	1.63	-0.19
	P₂d-07	3.86	310.81	288.70	22.11	13.06	14.10	5.32	1.46	0.56	0.92	2.02	-0.05
	P₂d-09	1.25	296.57	275.08	21.49	12.80	13.94	5.28	1.53	0.60	0.93	2.00	-0.05
	P₂d-10	0.95	332.41	305.22	27.19	11.23	13.46	4.37	1.73	0.56	0.88	1.93	-0.08
	P₂d-11	7.72	336.85	311.77	25.08	12.43	12.55	3.70	1.55	0.47	0.90	1.80	-0.06
	P₂d-12	1.23	218.44	201.71	16.73	12.06	12.57	5.35	1.30	0.57	0.92	1.80	-0.05
	P₂d-13	0.66	293.04	273.34	19.70	13.88	14.00	4.16	1.50	0.54	0.91	2.01	-0.05
龙潭组	P₂l-05	1.28	346.38	303.78	42.60	7.13	8.37	3.49	1.83	0.56	0.90	1.20	-0.06
	P₂l-06	4.48	216.64	197.30	19.34	10.20	10.72	5.09	1.28	0.65	0.91	1.54	-0.05
	P₂l-07	1.06	151.63	134.80	16.83	8.01	7.68	2.08	1.77	0.69	0.88	1.10	-0.09
孤峰组	P₁g-04	0.46	254.79	231.45	23.34	9.92	11.50	4.14	1.80	0.64	0.93	1.65	-0.05
	P₁g-06	0.03	266.02	240.87	25.15	9.58	10.83	3.99	1.74	0.64	0.93	1.55	-0.05
	P₁g-08	0.63	268.90	243.15	25.75	9.44	10.78	4.02	1.73	0.65	0.93	1.54	-0.05
	P₁g-10	0.86	264.03	238.14	25.89	9.20	11.16	3.95	1.94	0.64	0.94	1.60	-0.05
	P₁g-11	0.72	266.05	241.72	24.33	9.94	11.10	4.10	1.68	0.63	0.93	1.59	-0.05
注：稀土元素总量∑REE=La+Ce+Pr+Nd+Sm+Eu+Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu；轻稀土元素总量LREE=La+Ce+ Pr +Nd+Sm+Eu；重稀土元素含量HREE=Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu；L/H为轻稀土含量与重稀土含量之比；La_N/Yb_N、La_N/Sm_N和Gd_N/Yb_N均为经过球粒陨石标准化后的比值；δEu=Eu_N/(Sm_N×Gd_N)^1/2；δCe=Ce_N/(La_N×Pr_N)^1/2；La_n/Yb_n为北美页岩标准化后的比值；Ce_anom（铈异常指数）=lg[3Ce_n/(2La_n+Nd_n)].

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表 4 研究区样品与不同构造背景沉积盆地杂砂岩的REE特征对比

Table 4. The comparison of REE characteristic parameters with those from graywackes in different settings

构造背景	La(μg/g)	Ce(μg/g)	∑REE(μg/g)	La/Yb	LREE/HREE	La_N/Yb_N	δEu
大洋岛弧	8±1.7	19±3.7	58±10	4.2±1.3	3.8±0.9	2.8±0.9	1.04±0.11
大陆岛弧	27±4.5	59±8.2	146±20	11.0±3.6	7.7±1.7	7.5±2.5	0.79±0.13
活动大陆边缘	37.00	78.00	186.00	12.50	9.10	8.50	0.60
被动大陆边缘	39.00	85.00	210.00	15.90	8.50	10.80	0.56
研究区平均值	58.34	106.21	259.15	17.24	10.41	11.65	0.60
校正后	48.62	88.51	215.96	17.24	10.41	11.65	0.60
注：参考数据引自文献（Bhatia，1985），校正值=平均值/1.2.

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下扬子二叠系泥页岩稀土元素地球化学特征及地质意义

doi: 10.3799/dqkx.2019.274

作者简介:
赵晨君(1995-), 男, 硕士研究生, 主要从事沉积学理论与应用方面的工作.ORCID:0000-0003-4843-4062.E-mail:zcj74520@163.com

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康志宏, E-mail:kangzh98@163.com

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Geochemical Characteristics of Rare Earth Elements and Their Geological Significance of Permian Shales in Lower Yangtze Area

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下扬子二叠系泥页岩稀土元素地球化学特征及地质意义

doi: 10.3799/dqkx.2019.274

作者简介: 赵晨君(1995-), 男, 硕士研究生, 主要从事沉积学理论与应用方面的工作.ORCID:0000-0003-4843-4062.E-mail:zcj74520@163.com

通讯作者: 康志宏, E-mail:kangzh98@163.com

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Geochemical Characteristics of Rare Earth Elements and Their Geological Significance of Permian Shales in Lower Yangtze Area

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作者简介:
赵晨君(1995-), 男, 硕士研究生, 主要从事沉积学理论与应用方面的工作.ORCID:0000-0003-4843-4062.E-mail:zcj74520@163.com

通讯作者:
康志宏, E-mail:kangzh98@163.com