湘东北冷家溪群沉积岩地球化学特征及其构造意义

柏道远; 蒋启生; 李彬; 姜文; 李银敏

doi:10.19509/j.cnki.dzkq.2021.0017

湘东北冷家溪群沉积岩地球化学特征及其构造意义

doi: 10.19509/j.cnki.dzkq.2021.0017

基金项目:

中国地质调查局项目 DD20160031-04

湖南省地质矿产勘探开发局科研项目 2019-17

详细信息

作者简介:
柏道远(1967-), 男, 教授级高级工程师, 主要从事区域地质调查与基础地质研究工作。E-mail:daoyuanbai@sina.com

中图分类号: P542;P549
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出版历程
- 收稿日期: 2020-03-06

Geochemistry and tectonic implication of the sedimentary rocks in Lengjiaxi Group in northeastern Hunan

摘要

摘要: 冷家溪群是江南造山带湖南段的最早物质纪录，其沉积构造背景及相关的钦杭结合带位置尚存争议。在野外地质调查基础上，对湘东北金井地区冷家溪群早期-中期相对新鲜砂岩采样进行系统的主量元素和微量元素含量分析，进而按时代先后对砂岩分组并进行地球化学研究，以此探讨沉积期盆地性质及大地构造格局。金井地区冷家溪群砂岩的主量元素组成变化较大，SiO₂质量分数总体较低、Al₂O₃质量分数和Al₂O₃/SiO₂比值较高、K₂O/Na₂O比值高且变化大。轻稀土富集、重稀土平坦、铕负异常明显等特征暨球粒陨石标准化曲线形态与典型的后太古宙页岩和上陆壳相似。主量元素地球化学特征反映沉积环境为弧后盆地，且早期易家桥组和潘家冲组的成熟度较高，主要来源于北邻构造相对稳定的扬子陆块南缘；中期雷神庙组-黄浒洞组的成熟度较低，可能更多来源于南邻构造相对活动的大陆岛弧。各组地层构造环境微量元素判别图解均显示为大陆岛弧环境，但从微量元素特征对母岩的继承性分析，仍反映出弧后盆地环境；有关微量元素参数的相对大小指示早期沉积环境为活动陆缘、中期沉积环境为大陆岛弧，与主量元素特征反映的信息一致。根据上述地球化学证据，提出冷家溪期构造格局与演化过程：早期受古华南洋板块向北西高角度俯冲影响，弧后软流圈上涌导致岩石圈伸展而形成宽阔的弧后盆地，金井地区处于盆地北部而主要接受北邻扬子陆块来源沉积；中期古华南洋板块俯冲角度变缓并推动大陆岛弧向北西运移，弧后盆地收缩，金井地区因构造迁移而主要接受南邻大陆岛弧来源沉积。结合区域资料，认为弧后盆地南邻大陆岛弧大体在安仁-双牌一线。
- 冷家溪群 /
- 地球化学特征 /
- 弧后盆地 /
- 构造迁移 /
- 湘东北
Abstract: Lengjiaxi Group is the earliest material record of Jiangnan orogenic belt in Hunan.There exist debates about the sedimentary tectonic setting of Lengjiaxi Group and the related location of Qinzhou-Hangzhou juncture.Based on field investigation, the authors collected fresh samples from the sandstones in lower-middle Lengjiaxi Group from Jinjing, northeastern Hunan, analysed their major and trace element compositions, studied the geochemistry of the sandstones in groups by age, and then probed into the basin type and tectonic framework.The sandstones on the whole are characterized by considerable variations of petrochemical components, lower SiO₂ contents, high Al₂O₃ contents, high Al₂O₃/SiO₂ and K₂O/Na₂O ratios.The REE distribution patterns are similar to typical post-Archean shales and the upper continental crust, with LREE enrichment, flat HREE, and significant negative Eu-anomalies.Characteristics of major elements suggest that the sedimentary environment was back-arc basin, and that the Yijiaqiao Formation and Panjiachong Formation in early stage possess higher maturity with sediment source from stable Yangtze Block to the north, while the Leishenmiao Formation and Huanghudong Formation in middle stage possess lower maturity with more sediment source from active continental arc to the south.Trace element-diagrams for discrimination of structural environment of all the formations show informations of continental arc, which actually reflects back-arc basin setting according to trace element inheritance from source rocks.Relative numeric size of trace elements parameters suggested that the sedimentary environment in the early stage was active continental margin, and in middle stage was continental arc, which is accordant with the information of major elements.According to the geochemistry evidences, the authors put forward the tectonic framework and evolution in Lengjiaxi Period as follows: in the early stage, upwelling of back-arc asthenosphere mantle caused lithospheric to extend for northwest-ward high-angle subduction of Huanan ocean block, and broad back-arc basin was thus formed, when Jinjing area was located in northern basin and there occurred deposits with source mainly from Yangtze Block to the north.In the middle stage, Huanan ocean block subducted with low-angle and pushed the continental arc northwest-ward, which caused the back-arc basin to contract, when for tectonic migration, there occurred deposits in Jinjing area with source mainly from continental arc to the south.Based on the studies of geochemistry of Lengjiaxi Group in this paper and regional geological features, it is considered that the continental arc to the south of back-arc basin was along An'ren-Shuangpai.
- Lengjiaxi Group /
- geochemistry /
- back-arc basin /
- tectonic migration /
- northeastern Hunan

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图 1 冷家溪群及相当时代地层在湖南及邻区的分布(据文献[40]略修改)

Figure 1. Distribution of Lengjiaxi Group and its corresponding stratum

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图 2 金井地区地质及采样位置图(a)、冷家溪群柱状图(b)

1.地质界线；2.角度不整合界线；3.断裂；4.样品位置及编号；K-E.白垩系-古近系；Qb¹x.小木坪组；Qb¹h.黄浒洞组；Qb¹l.雷神庙组；Qb¹p.潘家冲组；Qb¹y.易家桥组；γJ.侏罗纪花岗岩；γQb.青白口纪花岗岩

Figure 2. Geological map of Jinjing area showing the sampling location (a) and the column of Lengjiaxi Group (b)

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图 3 稀土元素的球粒陨石标准化曲线(球粒陨石标准化参数据文献[42])

Figure 3. Chondrite-mornalized distribution patterns of the rare earth elements

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图 4 微量元素的PAAS标准化曲线(PAAS标准化参数据文献[42])

Figure 4. PAAS-mornalized distribution patterns of the trace elements

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图 5 金井地区冷家溪群砂岩的K₂O/Na₂O-w(SiO₂)(a)和SiO₂/Al₂O₃-K₂O/Na₂O(b)构造环境判别图

不同构造环境的界线据文献[55]：ARC.大洋岛弧；ACM.活动大陆边缘；PM.被动大陆边缘；A1.玄武质和安山质碎屑的岛弧环境；A2.长英质侵入岩碎屑的进化岛弧环境

Figure 5. Tectonic setting discrimination diagrams of K₂O/Na₂O-SiO₂(a) and SiO₂/Al₂O₃-K₂O/Na₂O(b) for the sandstones of Lengjiaxi Group in Jinjing area

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图 6 金井地区冷家溪群砂岩的主量元素构造环境判别分析图(构造环境判别函数和不同构造环境分布区域据文献[43])

Figure 6. Diagram of discriminant scores for the sandstones of Lengjiaxi Group in Jinjing area

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图 7 金井地区冷家溪群砂岩构造环境的Ti/Zr-La/Sc判别图(不同构造环境的分布区域据文献[44])

A.大洋岛弧；B.大陆岛弧；C.活动大陆边缘；D.被动大陆边缘

Figure 7. Tectonic setting discrimination diagrams of Ti/Zr-La/Sc for the sandstones of Lengjiaxi Group in Jinjing area

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图 8 金井地区冷家溪群砂岩构造环境的La-Th-Sc(a)、Th-Co-Zr/10(b)和Th-Sc-Zr/10(c)判别图(不同构造环境的分布区域据文献[44])

A.大洋岛弧；B.大陆岛弧；C.活动大陆边缘；D.被动大陆边缘

Figure 8. Tectonic setting discrimination diagrams of La-Th-Sc(a), Th-Co-Zr/10(b) and Th-Sc-Zr/10(c) for the sandstones of Lengjiaxi Group in Jinjing area

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图 9 金井地区冷家溪群砂岩沉积构造环境的Al₂O₃/SiO₂-(FeO+MgO)/(SiO₂+K₂O+Na₂O)判别图(不同构造环境之间的界线据文献[52])

Figure 9. Tectonic setting discrimination diagrams of Al₂O₃/SiO₂-(FeO+MgO)/(SiO₂+K₂O+Na₂O) for the sandstones of Lengjiaxi Group in Jinjing area

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图 10 冷家溪群沉积早期-中期构造格局及演化

Figure 10. Tectonic framework and evolution in early-middle period of Lengjiaxi Group

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表 1 湘东北金井地区冷家溪群沉积岩地球化学组成

Table 1. Major and trace element compositions of the sedimentary rocks of Lengjiaxi Group in Jinjing area, northeast Hunan

样品号		WY23-31	WY23-37	WY24-6	WY24-8	WY23-40	WY23-41	WY26-3	WY26-2	WY26-5	WY26-7	WY27-0	WY27-5	WY27-9	WY713	WY714	WY27-15
层位岩性		易家桥组				潘家冲组							雷神庙组		黄浒洞组
层位岩性		细砂岩	细砂岩	细砂岩	细砂岩	细砂岩	细砂岩	粉-细砂岩	细砂岩	细砂岩	细砂岩	细砂岩	细砂岩	细砂岩	细砂岩	细砂岩	细砂岩
SiO₂	w_B/%	63.87	71.99	67.54	62.5	68.06	71.15	64.41	63.30	62.39	66.49	65.44	62.19	60.85	60.78	61.95	63.80
Al₂O₃		17.76	12.77	15.84	16.77	14.65	14.18	17.15	16.02	17.28	14.46	12.64	16.94	17.84	17.83	15.84	17.08
Fe₂O₃		2.21	2.03	4.99	1.12	1.54	1.33	3.43	1.52	1.59	4.45	1.28	1.10	1.96	1.52	0.87	2.98
FeO		4.65	3.89	1.32	5.38	5.11	4.23	2.69	5.65	5.56	3.62	5.53	5.96	5.58	5.90	5.63	4.27
CaO		0.16	0.16	0.07	1.02	0.14	0.05	0.18	0.49	0.22	0.13	2.11	0.44	0.15	0.66	0.24	0.35
MgO		1.81	1.27	1.43	2.44	1.98	1.29	2.18	2.67	3.10	2.23	2.81	2.82	2.95	2.68	2.42	2.51
K₂O		3.89	2.32	2.72	3.82	2.77	2.66	3.77	3.32	3.32	2.22	1.74	3.41	3.78	3.88	3.21	3.9
Na₂O		0.88	1.49	0.25	1.08	1.16	1.07	0.91	1.32	1.60	1.37	2.10	1.87	1.27	1.16	1.51	0.28
TiO₂		0.34	0.61	0.47	0.54	0.35	0.34	0.45	0.45	0.44	0.25	0.30	0.41	0.44	0.47	0.34	0.41
P₂O₅		0.14	0.13	0.073	0.13	0.10	0.096	0.10	0.11	0.14	0.085	0.091	0.12	0.10	0.11	0.11	0.22
MnO		0.028	0.062	0.053	0.240	0.044	0.030	0.027	0.120	0.083	0.140	0.250	0.097	0.100	0.16	0.096	0.08
烧失量		3.70	2.57	4.57	4.64	3.46	2.95	4.04	4.33	4.08	3.88	5.47	3.91	4.30	4.50	7.42	3.84
H₂O⁺		1.80	1.44	2.95	1.74	1.62	1.38	2.51	1.93	1.92	2.92	1.60	1.64	1.44	1.72	0.93	1.83
FeO^T+MgO		8.35	6.94	7.08	8.70	8.39	6.67	7.81	9.57	9.92	9.64	9.36	9.68	10.22	9.81	8.78	9.32
Al₂O₃/SiO₂		0.28	0.18	0.23	0.27	0.22	0.20	0.27	0.25	0.28	0.22	0.19	0.27	0.29	0.29	0.26	0.27
K₂O/Na₂O		4.42	1.56	10.88	3.54	2.39	2.49	4.14	2.52	2.08	1.62	0.83	1.82	2.98	3.34	2.13	13.93
La	w_B/10^-6	44.7	43.2	63.7	41.2	37.9	42.4	38.3	37.8	40.7	30.9	23.6	37.9	39.2	36.4	27.8	47.8
Ce		82.3	78.8	82.8	76.8	69.3	77.2	66.3	70.6	73.8	54.3	43.8	71.2	68.2	68.6	50.1	90.1
Pr		10.10	9.80	14.40	9.42	8.64	9.67	8.45	8.71	9.21	7.29	5.44	8.71	8.94	8.27	5.97	11.2
Nd		38.2	37.5	54.6	36.1	33.0	37.2	32.4	33.0	35.6	28.2	21.0	33.6	33.8	32.2	22.7	44.2
Sm		7.25	7.01	9.81	6.94	6.16	7.07	6.07	6.24	6.92	5.58	4.27	6.43	6.52	6.20	4.50	8.63
Eu		1.25	1.28	1.65	1.26	1.11	1.30	1.13	1.13	1.23	1.00	0.74	1.23	1.18	1.13	0.85	1.48
Gd		5.52	5.58	7.65	5.61	4.81	5.4	4.92	5.18	5.46	4.38	3.50	5.22	5.1	4.94	3.69	6.61
Tb		0.66	0.65	0.98	0.78	0.56	0.63	0.63	0.63	0.68	0.57	0.50	0.68	0.58	0.67	0.47	0.82
Dy		2.66	2.98	4.63	4.12	2.26	2.78	3.03	2.95	3.42	2.84	2.65	3.27	2.74	3.46	2.54	3.78
Ho		0.45	0.52	0.94	0.88	0.40	0.45	0.63	0.61	0.70	0.58	0.53	0.72	0.58	0.73	0.57	0.72
Er		1.60	1.60	2.86	2.74	1.34	1.73	2.10	2.01	2.22	3.04	1.70	2.33	1.98	2.28	1.91	2.34
Tm		0.31	0.29	0.53	0.52	0.26	0.30	0.39	0.39	0.42	0.36	0.31	0.45	0.41	0.45	0.39	0.46
Yb		2.27	2.03	3.42	3.56	1.90	2.22	2.76	2.68	2.93	2.42	1.97	3.16	2.77	3.06	2.65	3.16
Lu		0.43	0.38	0.59	0.62	0.36	0.41	0.52	0.48	0.54	0.42	0.37	0.56	0.51	0.55	0.46	0.56
ΣREE		198.00	192.00	249.00	191.00	168.00	189.00	168.00	172.00	184.00	142.00	110.00	175.00	173.00	169.00	125.00	222.00
(La/Yb)_N		13.00	14.05	12.30	7.64	13.17	12.61	9.16	9.31	9.17	8.43	7.91	7.92	9.34	7.85	6.93	9.99
(La/Sm)_N		3.76	3.76	3.96	3.62	3.75	3.66	3.85	3.69	3.58	3.38	3.37	3.59	3.66	3.58	3.77	3.38
(Gd/Yb)_N		1.95	2.21	1.80	1.27	2.03	1.95	1.43	1.55	1.50	1.45	1.43	1.33	1.48	1.30	1.12	1.68
LREE/HREE		13.22	12.66	10.51	9.12	13.13	12.56	10.19	10.55	10.23	8.71	8.57	9.71	10.76	9.47	8.83	11.02
δEu		0.59	0.61	0.57	0.60	0.61	0.62	0.62	0.60	0.60	0.60	0.57	0.64	0.61	0.61	0.62	0.58
δCe		0.88	0.87	0.62	0.89	0.88	0.87	0.84	0.89	0.87	0.83	0.88	0.90	0.83	0.90	0.88	0.89
Cu	w_B/10^-6	36.6	18.8	35.3	38.8	32.2	17.3	18.4	42.7	39.9	35.1	32.8	40.9	33.3	34.3	35.1	30.0
Pb		38.9	16.3	9.34	14.9	22.0	8.5	8.44	22.2	13.0	16.0	17.8	22.2	18.2	17.5	17.4	22.7
Zn		125.0	105.0	143.0	128.0	106.0	95.2	94.8	125.0	113.0	111.0	103.0	122.0	122.0	128.0	102.0	110.0
Cr		109.0	76.4	125	97.3	109.0	66.4	137.0	128.0	176.0	205.0	197.0	146.0	138.0	121.0	128.0	92.3
Ni		41.0	26.3	59.9	37.5	40.0	26.8	41.0	46.8	49.2	54.3	45.6	45.8	49.8	45.7	36.3	37.7
Co		12.10	8.74	12.40	15.60	12.30	7.90	12.90	18.40	18.40	18.20	15.60	18.40	19.00	16.90	14.20	15.50
Cd		0.10	0.10	0.10	0.12	0.11	0.08	0.11	0.11	0.06	0.14	0.13	0.10	0.12	0.10	0.08	0.11
Li		61.0	36.5	35.0	46.6	56.2	46.5	43.7	57.2	60.6	67.7	66.4	60.4	67.4	71.4	24.0	55.4
Rb		199	107	131	197	140	119	192	170	174	107	87.9	173	196	184	158	194
Cs		16.3	10.0	11.2	14.9	11.8	10.8	13.9	13.2	13.8	9.8	6.9	13.7	16.5	12.8	14.4	18.0
W		1.94	1.73	5.09	2.45	2.40	1.31	1.50	1.79	1.99	1.09	0.71	1.29	1.42	1.6	2.44	2.51
Mo		0.84	0.51	0.74	0.29	0.16	0.41	0.19	0.23	0.2	0.15	0.22	0.32	0.16	0.25	1.02	0.20
As		18.50	11.30	1.62	25.80	10.40	12.00	10.20	10.60	3.13	9.31	15.10	8.70	4.62	2.29	51.80	54.10
Sb		0.67	0.39	1.46	2.10	0.27	0.33	0.57	0.56	0.55	0.46	0.70	0.81	0.75	4.29	34.50	4.45
Bi		0.84	0.28	0.19	0.34	1.00	0.11	0.35	0.42	0.30	0.31	0.20	0.47	0.35	0.30	0.46	0.61
Hg		0.014	0.013	0.025	0.046	0.012	0.022	0.019	0.019	0.020	0.020	0.023	0.034	0.013	0.017	0.031	0.020
Sr		52.4	49.1	12.4	34.4	42.2	43.4	25.5	32.8	29.2	31.2	86.1	35.6	24.2	34.2	38.5	31.2
Ba		438	352	375	316	350	406	359	321	346	225	214	344	406	390	336	379
V		121.0	86.6	107.0	116.0	99.3	86.1	130.0	124.0	136.0	118.0	97.2	133.0	140.0	133.0	120.0	119.0
Sc		20.6	13.0	16.8	19.3	16.6	13.7	23.1	21.8	25.5	21.6	18.3	23.6	26.2	24	21.3	20.1
Nb		9.24	14.40	8.45	10.30	9.62	8.83	9.47	8.77	8.16	3.84	3.78	9.13	7.22	8.11	6.17	7.56
Ta		0.70	1.29	0.81	0.91	0.71	0.77	0.73	0.78	0.86	0.64	0.29	1.29	0.60	0.83	0.77	0.58
Y		13.4	13.8	26.2	21.4	10.3	12.0	16.6	15.4	17.6	15.1	13.9	17.3	14.5	17.6	14.1	18.2
Zr		194	296	269	204	192	258	176	178	176	189	172	178	165	172	170	198
Hf		5.50	8.25	7.40	5.85	5.50	7.20	5.00	5.00	5.00	5.40	4.90	5.00	4.60	5.00	5.60	5.60
Be		3.05	1.92	2.95	2.76	2.51	2.19	2.52	2.54	2.52	1.88	1.51	2.56	2.76	2.71	2.44	2.94
B		116.6	68.8	83.9	101.8	80.3	78.2	86.4	96.4	41.8	63.7	57.7	80.1	84.5	80.8	124.7	106.6
Ga		22.6	16.0	18.2	22.2	18.3	17.3	21.4	21.0	21.2	15.6	13.8	22.7	23.0	23.0	20.7	21.6
Sn		5.23	3.41	4.36	5.03	4.45	4.02	4.475	4.05	5.16	3.60	2.84	4.67	4.70	5.46	4.51	5.20
U		3.01	2.59	2.84	2.80	2.64	2.74	2.69	2.60	2.46	2.02	1.81	2.62	2.40	2.57	2.54	2.77
Th		18.4	15.6	15.1	15.1	14.1	14.6	15.0	15.4	14.2	12.3	10.2	19.4	14.2	15.3	16.9	16.9
注：①所有样品由国土资源部长沙矿产资源监督检测中心完成测试，测试仪器为：ICAP-6300电感耦合等离子体发射光谱仪、X Series 2 ICP-MS电感耦合等离子体质谱仪、PGS-2二米光栅光谱仪、AFS-830a双道原子荧光光谱仪；②FeO^T表示全铁；③ΣREE为元素La~Lu含量总和，LREE/HREE = Σ(La~Sm)/ Σ(Gd~Lu) ^[41]，球粒陨石标准化参数据文献[42]

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表 2 金井地区冷家溪群砂岩与不同构造环境下杂砂岩的化学组成对比

Table 2. Comparison of chemical compositions of the sandstones of Lengjiaxi Group in Jinjing area with the graywackes from various tectonic settings

		金井地区冷家溪群砂岩			临湘地区冷家溪群	沅陵地区冷家溪群	显生宙不同构造环境下杂砂岩
		易家桥组	潘家冲组	雷神庙组-黄浒洞组	临湘地区冷家溪群	沅陵地区冷家溪群	大洋岛弧	大陆岛弧	活动大陆边缘	被动大陆边缘	PAAS	上陆壳
SiO₂	w_B/%	69.55	69.03	65.37	71.29	73.62	58.83	70.69	73.86	81.95	62.80	66.00
Al₂O₃		16.53	15.92	18.05	15.34	12.71	17.11	14.04	12.89	8.41	18.9	15.20
Fe₂O₃		2.71	2.27	1.77	2.44	2.03	1.95	1.43	1.30	1.32
FeO		3.98	4.85	5.78	3.44	4.62	5.52	3.05	1.58	1.76	6.50	4.50
CaO		0.37	0.50	0.39	0.26	0.64	5.83	2.68	2.48	1.89	1.30	4.20
MgO		1.82	2.44	2.82	1.61	1.97	3.65	1.97	1.23	1.39	2.20	2.20
K₂O		3.34	2.96	3.84	2.93	1.80	1.60	1.89	2.90	1.71	3.70	3.40
Na₂O		0.96	1.43	1.29	1.78	1.78	4.10	3.12	2.77	1.07	1.20	3.90
TiO₂		0.51	0.39	0.44	0.69	0.60	1.06	0.64	0.46	0.49	1.00	0.50
P₂O₅		0.12	0.11	0.14	0.12	0.10	0.26	0.16	0.09	0.12	0.16
MnO		0.10	0.10	0.11	0.10	0.14	0.15	0.10	0.10	0.05	0.11
Fe₂O₃^*+MgO		8.24	9.33	10.20	7.25	8.42	11.73	6.79	4.63	2.89	9.35	7.15
Al₂O₃/SiO₂		0.24	0.23	0.28	0.22	0.17	0.29	0.20	0.18	0.10	0.30	0.23
K₂O/Na₂O		5.10	2.29	4.84	1.66	1.07	0.39	0.61	0.99	1.60	3.08	0.87
n		4	7	5	6	12	7	9	7	7
La		48.2	35.9	37.8	39.5	35.3	8.2	27.0	37.0	39.0	38.0	30.0
Ce	w_B/10^-6	80.2	65.0	69.6	73.4	67.4	19.4	59.0	78.0	85.0	80.0	64.0
Nd		41.6	31.5	33.3	36.2	31.0	11.2	28.3	35.8	42.0	32.0	26.0
ΣREE		207	162	173	190	170	58.0	146	186	210	183	146
Eu/Eu^*		0.59	0.60	0.61	0.73	0.62	1.04	0.80	0.60	0.55	0.66	0.65
(La/Yb)_N		11.75	9.97	8.41	7.10	7.06	2.80	7.50	8.30	10.8	9.20	9.20
(Gd/Yb)_N		1.81	1.62	1.38	1.38	1.36	1.31	1.49	1.26	2.75	1.36	1.40
LREE/HREE		11.41	10.60	9.99	7.23	7.14	3.80	7.70	9.10	8.50	9.45	9.47
K/Rb		175	174	176	213	176	578	219	189	178	192	250
Rb/Sr		4.28	3.41	5.53	1.72	1.78	0.05	0.65	0.89	1.19	0.8	0.32
Th		16.1	13.7	16.5	10.3	11.0	2.27	11.1	18.8	16.7	14.6	10.7
Zr	w_B/10^-6	241	192	177	472	344	96	229	179	298	210	190
Hf		6.8	5.4	5.2	3.5	2.5	2.1	6.3	6.8	10.1	5.0	5.8
K/Th		1 726	1 796	1 925	2 360	1 354	4 055	1 296	1 252	681	2 103	2 617
Zr/Hf		35.7	35.3	34.2	134.8	135.4	45.7	36.3	26.3	29.5	42.00	32.76
Zr/Th		15.0	14.0	10.7	45.8	31.2	48	21.5	9.5	19.1	14.4	17.8
La/Th		3.00	2.63	2.29	3.83	3.20	4.26	2.36	1.77	2.2	2.60	2.80
La/Y		2.58	2.49	2.31	1.26	1.24	0.48	1.02	1.33	1.31	1.41	1.36
Sc		17	20	23	14.7	14.5	19.5	14.8	8	6	16	11
Cr		102	145	125			37	51	26	39	110	35
Ni	w_B/10^-6	41	43	43	28	39	11	13	10	8	55	20
V		108	113	129	98	95	131	89	48	31	150	60
Co		12	15	17	11	17	18	12	10	5	23	10
Zn		125	107	117	102	101	89	74	52	26	85	71
La/Sc		2.77	1.79	1.64	2.69	2.43	0.55	1.82	4.55	6.25	2.38	2.73
Th/Sc		0.92	0.68	0.72	0.70	0.76	0.15	0.85	2.59	3.06	0.91	0.97
Sc/Cr		0.17	0.14	0.18			0.57	0.32	0.3	0.16	0.15	0.31
Ti/Zr		12.8	12.1	14.8	8.72	10.42	56.8	19.7	15.3	6.74	28.6	15.8
n		4	7	5	6	12	11	32	10	15
注：①n为样品数；稀土元素球粒陨石标准化参数据文献[42]，Eu/Eu^*=Eu_N/(Sm_N×Gd_N)^1/2；②临湘地区和沅陵地区数据据文献[25]；③不同构造环境杂砂岩的数据据文献[43-44]；澳大利亚后太古宙平均页岩(PAAS)和上陆壳成分据文献[42]；④带下划线的参数为最具构造环境判别意义的参数^[43-44]

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